socket.c 74.3 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6
/*
 * NET		An implementation of the SOCKET network access protocol.
 *
 * Version:	@(#)socket.c	1.1.93	18/02/95
 *
 * Authors:	Orest Zborowski, <obz@Kodak.COM>
7
 *		Ross Biro
L
Linus Torvalds 已提交
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 * Fixes:
 *		Anonymous	:	NOTSOCK/BADF cleanup. Error fix in
 *					shutdown()
 *		Alan Cox	:	verify_area() fixes
 *		Alan Cox	:	Removed DDI
 *		Jonathan Kamens	:	SOCK_DGRAM reconnect bug
 *		Alan Cox	:	Moved a load of checks to the very
 *					top level.
 *		Alan Cox	:	Move address structures to/from user
 *					mode above the protocol layers.
 *		Rob Janssen	:	Allow 0 length sends.
 *		Alan Cox	:	Asynchronous I/O support (cribbed from the
 *					tty drivers).
 *		Niibe Yutaka	:	Asynchronous I/O for writes (4.4BSD style)
 *		Jeff Uphoff	:	Made max number of sockets command-line
 *					configurable.
 *		Matti Aarnio	:	Made the number of sockets dynamic,
 *					to be allocated when needed, and mr.
 *					Uphoff's max is used as max to be
 *					allowed to allocate.
 *		Linus		:	Argh. removed all the socket allocation
 *					altogether: it's in the inode now.
 *		Alan Cox	:	Made sock_alloc()/sock_release() public
 *					for NetROM and future kernel nfsd type
 *					stuff.
 *		Alan Cox	:	sendmsg/recvmsg basics.
 *		Tom Dyas	:	Export net symbols.
 *		Marcin Dalecki	:	Fixed problems with CONFIG_NET="n".
 *		Alan Cox	:	Added thread locking to sys_* calls
 *					for sockets. May have errors at the
 *					moment.
 *		Kevin Buhr	:	Fixed the dumb errors in the above.
 *		Andi Kleen	:	Some small cleanups, optimizations,
 *					and fixed a copy_from_user() bug.
 *		Tigran Aivazian	:	sys_send(args) calls sys_sendto(args, NULL, 0)
45
 *		Tigran Aivazian	:	Made listen(2) backlog sanity checks
L
Linus Torvalds 已提交
46 47 48 49 50 51 52 53 54 55
 *					protocol-independent
 *
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *
 *	This module is effectively the top level interface to the BSD socket
56
 *	paradigm.
L
Linus Torvalds 已提交
57 58 59 60 61 62 63 64 65
 *
 *	Based upon Swansea University Computer Society NET3.039
 */

#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/file.h>
#include <linux/net.h>
#include <linux/interrupt.h>
U
Ulrich Drepper 已提交
66
#include <linux/thread_info.h>
67
#include <linux/rcupdate.h>
L
Linus Torvalds 已提交
68 69 70
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
A
Arjan van de Ven 已提交
71
#include <linux/mutex.h>
L
Linus Torvalds 已提交
72 73
#include <linux/wanrouter.h>
#include <linux/if_bridge.h>
74 75
#include <linux/if_frad.h>
#include <linux/if_vlan.h>
L
Linus Torvalds 已提交
76 77 78 79 80 81 82 83 84 85
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/cache.h>
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/mount.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/compat.h>
#include <linux/kmod.h>
86
#include <linux/audit.h>
87
#include <linux/wireless.h>
88
#include <linux/nsproxy.h>
N
Nick Black 已提交
89
#include <linux/magic.h>
90
#include <linux/slab.h>
L
Linus Torvalds 已提交
91 92 93 94 95

#include <asm/uaccess.h>
#include <asm/unistd.h>

#include <net/compat.h>
96
#include <net/wext.h>
97
#include <net/cls_cgroup.h>
L
Linus Torvalds 已提交
98 99 100 101

#include <net/sock.h>
#include <linux/netfilter.h>

102 103 104 105 106 107
#include <linux/if_tun.h>
#include <linux/ipv6_route.h>
#include <linux/route.h>
#include <linux/sockios.h>
#include <linux/atalk.h>

L
Linus Torvalds 已提交
108
static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
109 110 111 112
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
			 unsigned long nr_segs, loff_t pos);
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
			  unsigned long nr_segs, loff_t pos);
113
static int sock_mmap(struct file *file, struct vm_area_struct *vma);
L
Linus Torvalds 已提交
114 115 116 117

static int sock_close(struct inode *inode, struct file *file);
static unsigned int sock_poll(struct file *file,
			      struct poll_table_struct *wait);
118
static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
119 120
#ifdef CONFIG_COMPAT
static long compat_sock_ioctl(struct file *file,
121
			      unsigned int cmd, unsigned long arg);
122
#endif
L
Linus Torvalds 已提交
123 124 125
static int sock_fasync(int fd, struct file *filp, int on);
static ssize_t sock_sendpage(struct file *file, struct page *page,
			     int offset, size_t size, loff_t *ppos, int more);
J
Jens Axboe 已提交
126
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
127
				struct pipe_inode_info *pipe, size_t len,
J
Jens Axboe 已提交
128
				unsigned int flags);
L
Linus Torvalds 已提交
129 130 131 132 133 134

/*
 *	Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
 *	in the operation structures but are done directly via the socketcall() multiplexor.
 */

135
static const struct file_operations socket_file_ops = {
L
Linus Torvalds 已提交
136 137 138 139 140 141
	.owner =	THIS_MODULE,
	.llseek =	no_llseek,
	.aio_read =	sock_aio_read,
	.aio_write =	sock_aio_write,
	.poll =		sock_poll,
	.unlocked_ioctl = sock_ioctl,
142 143 144
#ifdef CONFIG_COMPAT
	.compat_ioctl = compat_sock_ioctl,
#endif
L
Linus Torvalds 已提交
145 146 147 148
	.mmap =		sock_mmap,
	.open =		sock_no_open,	/* special open code to disallow open via /proc */
	.release =	sock_close,
	.fasync =	sock_fasync,
149 150
	.sendpage =	sock_sendpage,
	.splice_write = generic_splice_sendpage,
J
Jens Axboe 已提交
151
	.splice_read =	sock_splice_read,
L
Linus Torvalds 已提交
152 153 154 155 156 157 158
};

/*
 *	The protocol list. Each protocol is registered in here.
 */

static DEFINE_SPINLOCK(net_family_lock);
159
static const struct net_proto_family *net_families[NPROTO] __read_mostly;
L
Linus Torvalds 已提交
160 161 162 163 164

/*
 *	Statistics counters of the socket lists
 */

165
static DEFINE_PER_CPU(int, sockets_in_use);
L
Linus Torvalds 已提交
166 167

/*
168 169 170
 * Support routines.
 * Move socket addresses back and forth across the kernel/user
 * divide and look after the messy bits.
L
Linus Torvalds 已提交
171 172 173 174 175 176 177 178 179 180 181 182 183
 */

/**
 *	move_addr_to_kernel	-	copy a socket address into kernel space
 *	@uaddr: Address in user space
 *	@kaddr: Address in kernel space
 *	@ulen: Length in user space
 *
 *	The address is copied into kernel space. If the provided address is
 *	too long an error code of -EINVAL is returned. If the copy gives
 *	invalid addresses -EFAULT is returned. On a success 0 is returned.
 */

184
int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
L
Linus Torvalds 已提交
185
{
186
	if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
L
Linus Torvalds 已提交
187
		return -EINVAL;
188
	if (ulen == 0)
L
Linus Torvalds 已提交
189
		return 0;
190
	if (copy_from_user(kaddr, uaddr, ulen))
L
Linus Torvalds 已提交
191
		return -EFAULT;
192
	return audit_sockaddr(ulen, kaddr);
L
Linus Torvalds 已提交
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210
}

/**
 *	move_addr_to_user	-	copy an address to user space
 *	@kaddr: kernel space address
 *	@klen: length of address in kernel
 *	@uaddr: user space address
 *	@ulen: pointer to user length field
 *
 *	The value pointed to by ulen on entry is the buffer length available.
 *	This is overwritten with the buffer space used. -EINVAL is returned
 *	if an overlong buffer is specified or a negative buffer size. -EFAULT
 *	is returned if either the buffer or the length field are not
 *	accessible.
 *	After copying the data up to the limit the user specifies, the true
 *	length of the data is written over the length limit the user
 *	specified. Zero is returned for a success.
 */
211

212
int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr,
213
		      int __user *ulen)
L
Linus Torvalds 已提交
214 215 216 217
{
	int err;
	int len;

218 219
	err = get_user(len, ulen);
	if (err)
L
Linus Torvalds 已提交
220
		return err;
221 222
	if (len > klen)
		len = klen;
223
	if (len < 0 || len > sizeof(struct sockaddr_storage))
L
Linus Torvalds 已提交
224
		return -EINVAL;
225
	if (len) {
S
Steve Grubb 已提交
226 227
		if (audit_sockaddr(klen, kaddr))
			return -ENOMEM;
228
		if (copy_to_user(uaddr, kaddr, len))
L
Linus Torvalds 已提交
229 230 231
			return -EFAULT;
	}
	/*
232 233
	 *      "fromlen shall refer to the value before truncation.."
	 *                      1003.1g
L
Linus Torvalds 已提交
234 235 236 237
	 */
	return __put_user(klen, ulen);
}

238
static struct kmem_cache *sock_inode_cachep __read_mostly;
L
Linus Torvalds 已提交
239 240 241 242

static struct inode *sock_alloc_inode(struct super_block *sb)
{
	struct socket_alloc *ei;
243

244
	ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
L
Linus Torvalds 已提交
245 246
	if (!ei)
		return NULL;
247 248 249 250 251 252 253
	ei->socket.wq = kmalloc(sizeof(struct socket_wq), GFP_KERNEL);
	if (!ei->socket.wq) {
		kmem_cache_free(sock_inode_cachep, ei);
		return NULL;
	}
	init_waitqueue_head(&ei->socket.wq->wait);
	ei->socket.wq->fasync_list = NULL;
254

L
Linus Torvalds 已提交
255 256 257 258 259 260 261 262 263
	ei->socket.state = SS_UNCONNECTED;
	ei->socket.flags = 0;
	ei->socket.ops = NULL;
	ei->socket.sk = NULL;
	ei->socket.file = NULL;

	return &ei->vfs_inode;
}

264 265 266 267 268 269 270 271

static void wq_free_rcu(struct rcu_head *head)
{
	struct socket_wq *wq = container_of(head, struct socket_wq, rcu);

	kfree(wq);
}

L
Linus Torvalds 已提交
272 273
static void sock_destroy_inode(struct inode *inode)
{
274 275 276 277 278
	struct socket_alloc *ei;

	ei = container_of(inode, struct socket_alloc, vfs_inode);
	call_rcu(&ei->socket.wq->rcu, wq_free_rcu);
	kmem_cache_free(sock_inode_cachep, ei);
L
Linus Torvalds 已提交
279 280
}

281
static void init_once(void *foo)
L
Linus Torvalds 已提交
282
{
283
	struct socket_alloc *ei = (struct socket_alloc *)foo;
L
Linus Torvalds 已提交
284

C
Christoph Lameter 已提交
285
	inode_init_once(&ei->vfs_inode);
L
Linus Torvalds 已提交
286
}
287

L
Linus Torvalds 已提交
288 289 290
static int init_inodecache(void)
{
	sock_inode_cachep = kmem_cache_create("sock_inode_cache",
291 292 293 294 295
					      sizeof(struct socket_alloc),
					      0,
					      (SLAB_HWCACHE_ALIGN |
					       SLAB_RECLAIM_ACCOUNT |
					       SLAB_MEM_SPREAD),
296
					      init_once);
L
Linus Torvalds 已提交
297 298 299 300 301
	if (sock_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

302
static const struct super_operations sockfs_ops = {
303 304 305
	.alloc_inode	= sock_alloc_inode,
	.destroy_inode	= sock_destroy_inode,
	.statfs		= simple_statfs,
L
Linus Torvalds 已提交
306 307
};

308
static int sockfs_get_sb(struct file_system_type *fs_type,
309 310
			 int flags, const char *dev_name, void *data,
			 struct vfsmount *mnt)
L
Linus Torvalds 已提交
311
{
312 313
	return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
			     mnt);
L
Linus Torvalds 已提交
314 315
}

316
static struct vfsmount *sock_mnt __read_mostly;
L
Linus Torvalds 已提交
317 318 319 320 321 322

static struct file_system_type sock_fs_type = {
	.name =		"sockfs",
	.get_sb =	sockfs_get_sb,
	.kill_sb =	kill_anon_super,
};
323

324 325 326 327 328 329 330 331 332
/*
 * sockfs_dname() is called from d_path().
 */
static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
{
	return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
				dentry->d_inode->i_ino);
}

A
Al Viro 已提交
333
static const struct dentry_operations sockfs_dentry_operations = {
334
	.d_dname  = sockfs_dname,
L
Linus Torvalds 已提交
335 336 337 338 339
};

/*
 *	Obtains the first available file descriptor and sets it up for use.
 *
340 341
 *	These functions create file structures and maps them to fd space
 *	of the current process. On success it returns file descriptor
L
Linus Torvalds 已提交
342 343 344 345 346 347 348 349 350 351 352 353
 *	and file struct implicitly stored in sock->file.
 *	Note that another thread may close file descriptor before we return
 *	from this function. We use the fact that now we do not refer
 *	to socket after mapping. If one day we will need it, this
 *	function will increment ref. count on file by 1.
 *
 *	In any case returned fd MAY BE not valid!
 *	This race condition is unavoidable
 *	with shared fd spaces, we cannot solve it inside kernel,
 *	but we take care of internal coherence yet.
 */

354
static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
L
Linus Torvalds 已提交
355
{
356
	struct qstr name = { .name = "" };
357
	struct path path;
358
	struct file *file;
L
Linus Torvalds 已提交
359 360
	int fd;

361
	fd = get_unused_fd_flags(flags);
362 363
	if (unlikely(fd < 0))
		return fd;
L
Linus Torvalds 已提交
364

365 366
	path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
	if (unlikely(!path.dentry)) {
367
		put_unused_fd(fd);
368
		return -ENOMEM;
369
	}
370
	path.mnt = mntget(sock_mnt);
371

372 373
	path.dentry->d_op = &sockfs_dentry_operations;
	d_instantiate(path.dentry, SOCK_INODE(sock));
A
Al Viro 已提交
374
	SOCK_INODE(sock)->i_fop = &socket_file_ops;
375

376
	file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
377
		  &socket_file_ops);
A
Al Viro 已提交
378 379 380
	if (unlikely(!file)) {
		/* drop dentry, keep inode */
		atomic_inc(&path.dentry->d_inode->i_count);
381
		path_put(&path);
A
Al Viro 已提交
382 383 384 385 386
		put_unused_fd(fd);
		return -ENFILE;
	}

	sock->file = file;
387
	file->f_flags = O_RDWR | (flags & O_NONBLOCK);
388 389
	file->f_pos = 0;
	file->private_data = sock;
L
Linus Torvalds 已提交
390

391 392
	*f = file;
	return fd;
393 394
}

395
int sock_map_fd(struct socket *sock, int flags)
396 397
{
	struct file *newfile;
398
	int fd = sock_alloc_file(sock, &newfile, flags);
399

400
	if (likely(fd >= 0))
401
		fd_install(fd, newfile);
402

L
Linus Torvalds 已提交
403 404
	return fd;
}
405
EXPORT_SYMBOL(sock_map_fd);
L
Linus Torvalds 已提交
406

407 408 409 410 411
static struct socket *sock_from_file(struct file *file, int *err)
{
	if (file->f_op == &socket_file_ops)
		return file->private_data;	/* set in sock_map_fd */

E
Eric Dumazet 已提交
412 413
	*err = -ENOTSOCK;
	return NULL;
414 415
}

L
Linus Torvalds 已提交
416
/**
417
 *	sockfd_lookup - Go from a file number to its socket slot
L
Linus Torvalds 已提交
418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433
 *	@fd: file handle
 *	@err: pointer to an error code return
 *
 *	The file handle passed in is locked and the socket it is bound
 *	too is returned. If an error occurs the err pointer is overwritten
 *	with a negative errno code and NULL is returned. The function checks
 *	for both invalid handles and passing a handle which is not a socket.
 *
 *	On a success the socket object pointer is returned.
 */

struct socket *sockfd_lookup(int fd, int *err)
{
	struct file *file;
	struct socket *sock;

434 435
	file = fget(fd);
	if (!file) {
L
Linus Torvalds 已提交
436 437 438
		*err = -EBADF;
		return NULL;
	}
439

440 441
	sock = sock_from_file(file, err);
	if (!sock)
L
Linus Torvalds 已提交
442
		fput(file);
443 444
	return sock;
}
445
EXPORT_SYMBOL(sockfd_lookup);
L
Linus Torvalds 已提交
446

447 448 449 450 451
static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
{
	struct file *file;
	struct socket *sock;

452
	*err = -EBADF;
453 454 455 456 457 458
	file = fget_light(fd, fput_needed);
	if (file) {
		sock = sock_from_file(file, err);
		if (sock)
			return sock;
		fput_light(file, *fput_needed);
L
Linus Torvalds 已提交
459
	}
460
	return NULL;
L
Linus Torvalds 已提交
461 462 463 464
}

/**
 *	sock_alloc	-	allocate a socket
465
 *
L
Linus Torvalds 已提交
466 467 468 469 470 471 472
 *	Allocate a new inode and socket object. The two are bound together
 *	and initialised. The socket is then returned. If we are out of inodes
 *	NULL is returned.
 */

static struct socket *sock_alloc(void)
{
473 474
	struct inode *inode;
	struct socket *sock;
L
Linus Torvalds 已提交
475 476 477 478 479 480 481

	inode = new_inode(sock_mnt->mnt_sb);
	if (!inode)
		return NULL;

	sock = SOCKET_I(inode);

482
	kmemcheck_annotate_bitfield(sock, type);
483
	inode->i_mode = S_IFSOCK | S_IRWXUGO;
484 485
	inode->i_uid = current_fsuid();
	inode->i_gid = current_fsgid();
L
Linus Torvalds 已提交
486

487
	percpu_add(sockets_in_use, 1);
L
Linus Torvalds 已提交
488 489 490 491 492 493 494 495
	return sock;
}

/*
 *	In theory you can't get an open on this inode, but /proc provides
 *	a back door. Remember to keep it shut otherwise you'll let the
 *	creepy crawlies in.
 */
496

L
Linus Torvalds 已提交
497 498 499 500 501
static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
{
	return -ENXIO;
}

502
const struct file_operations bad_sock_fops = {
L
Linus Torvalds 已提交
503 504 505 506 507 508 509 510 511 512
	.owner = THIS_MODULE,
	.open = sock_no_open,
};

/**
 *	sock_release	-	close a socket
 *	@sock: socket to close
 *
 *	The socket is released from the protocol stack if it has a release
 *	callback, and the inode is then released if the socket is bound to
513
 *	an inode not a file.
L
Linus Torvalds 已提交
514
 */
515

L
Linus Torvalds 已提交
516 517 518 519 520 521 522 523 524 525
void sock_release(struct socket *sock)
{
	if (sock->ops) {
		struct module *owner = sock->ops->owner;

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

526
	if (sock->wq->fasync_list)
L
Linus Torvalds 已提交
527 528
		printk(KERN_ERR "sock_release: fasync list not empty!\n");

529
	percpu_sub(sockets_in_use, 1);
L
Linus Torvalds 已提交
530 531 532 533
	if (!sock->file) {
		iput(SOCK_INODE(sock));
		return;
	}
534
	sock->file = NULL;
L
Linus Torvalds 已提交
535
}
536
EXPORT_SYMBOL(sock_release);
L
Linus Torvalds 已提交
537

538 539 540 541 542 543 544 545 546 547 548 549
int sock_tx_timestamp(struct msghdr *msg, struct sock *sk,
		      union skb_shared_tx *shtx)
{
	shtx->flags = 0;
	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
		shtx->hardware = 1;
	if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
		shtx->software = 1;
	return 0;
}
EXPORT_SYMBOL(sock_tx_timestamp);

550
static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
L
Linus Torvalds 已提交
551 552 553 554 555
				 struct msghdr *msg, size_t size)
{
	struct sock_iocb *si = kiocb_to_siocb(iocb);
	int err;

556 557
	sock_update_classid(sock->sk);

L
Linus Torvalds 已提交
558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582
	si->sock = sock;
	si->scm = NULL;
	si->msg = msg;
	si->size = size;

	err = security_socket_sendmsg(sock, msg, size);
	if (err)
		return err;

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

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

	init_sync_kiocb(&iocb, NULL);
	iocb.private = &siocb;
	ret = __sock_sendmsg(&iocb, sock, msg, size);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}
583
EXPORT_SYMBOL(sock_sendmsg);
L
Linus Torvalds 已提交
584 585 586 587 588 589 590 591 592 593 594 595

int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
		   struct kvec *vec, size_t num, size_t size)
{
	mm_segment_t oldfs = get_fs();
	int result;

	set_fs(KERNEL_DS);
	/*
	 * the following is safe, since for compiler definitions of kvec and
	 * iovec are identical, yielding the same in-core layout and alignment
	 */
596
	msg->msg_iov = (struct iovec *)vec;
L
Linus Torvalds 已提交
597 598 599 600 601
	msg->msg_iovlen = num;
	result = sock_sendmsg(sock, msg, size);
	set_fs(oldfs);
	return result;
}
602
EXPORT_SYMBOL(kernel_sendmsg);
L
Linus Torvalds 已提交
603

604 605 606 607 608 609 610 611 612 613
static int ktime2ts(ktime_t kt, struct timespec *ts)
{
	if (kt.tv64) {
		*ts = ktime_to_timespec(kt);
		return 1;
	} else {
		return 0;
	}
}

614 615 616 617 618 619
/*
 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
 */
void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
	struct sk_buff *skb)
{
620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637
	int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
	struct timespec ts[3];
	int empty = 1;
	struct skb_shared_hwtstamps *shhwtstamps =
		skb_hwtstamps(skb);

	/* Race occurred between timestamp enabling and packet
	   receiving.  Fill in the current time for now. */
	if (need_software_tstamp && skb->tstamp.tv64 == 0)
		__net_timestamp(skb);

	if (need_software_tstamp) {
		if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
			struct timeval tv;
			skb_get_timestamp(skb, &tv);
			put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
				 sizeof(tv), &tv);
		} else {
638
			skb_get_timestampns(skb, &ts[0]);
639
			put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
640
				 sizeof(ts[0]), &ts[0]);
641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
		}
	}


	memset(ts, 0, sizeof(ts));
	if (skb->tstamp.tv64 &&
	    sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
		skb_get_timestampns(skb, ts + 0);
		empty = 0;
	}
	if (shhwtstamps) {
		if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
		    ktime2ts(shhwtstamps->syststamp, ts + 1))
			empty = 0;
		if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
		    ktime2ts(shhwtstamps->hwtstamp, ts + 2))
			empty = 0;
658
	}
659 660 661
	if (!empty)
		put_cmsg(msg, SOL_SOCKET,
			 SCM_TIMESTAMPING, sizeof(ts), &ts);
662
}
663 664
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);

665 666 667 668 669 670 671
inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
{
	if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
		put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
			sizeof(__u32), &skb->dropcount);
}

672
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
673 674 675 676 677
	struct sk_buff *skb)
{
	sock_recv_timestamp(msg, sk, skb);
	sock_recv_drops(msg, sk, skb);
}
678
EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
679

680 681
static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
				       struct msghdr *msg, size_t size, int flags)
L
Linus Torvalds 已提交
682 683 684
{
	struct sock_iocb *si = kiocb_to_siocb(iocb);

685 686
	sock_update_classid(sock->sk);

L
Linus Torvalds 已提交
687 688 689 690 691 692 693 694 695
	si->sock = sock;
	si->scm = NULL;
	si->msg = msg;
	si->size = size;
	si->flags = flags;

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

696 697 698 699 700 701 702 703
static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
				 struct msghdr *msg, size_t size, int flags)
{
	int err = security_socket_recvmsg(sock, msg, size, flags);

	return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
}

704
int sock_recvmsg(struct socket *sock, struct msghdr *msg,
L
Linus Torvalds 已提交
705 706 707 708 709 710
		 size_t size, int flags)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

711
	init_sync_kiocb(&iocb, NULL);
L
Linus Torvalds 已提交
712 713 714 715 716 717
	iocb.private = &siocb;
	ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}
718
EXPORT_SYMBOL(sock_recvmsg);
L
Linus Torvalds 已提交
719

720 721 722 723 724 725 726 727 728 729 730 731 732 733 734
static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
			      size_t size, int flags)
{
	struct kiocb iocb;
	struct sock_iocb siocb;
	int ret;

	init_sync_kiocb(&iocb, NULL);
	iocb.private = &siocb;
	ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
	if (-EIOCBQUEUED == ret)
		ret = wait_on_sync_kiocb(&iocb);
	return ret;
}

735 736
int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
		   struct kvec *vec, size_t num, size_t size, int flags)
L
Linus Torvalds 已提交
737 738 739 740 741 742 743 744 745
{
	mm_segment_t oldfs = get_fs();
	int result;

	set_fs(KERNEL_DS);
	/*
	 * the following is safe, since for compiler definitions of kvec and
	 * iovec are identical, yielding the same in-core layout and alignment
	 */
746
	msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
L
Linus Torvalds 已提交
747 748 749 750
	result = sock_recvmsg(sock, msg, size, flags);
	set_fs(oldfs);
	return result;
}
751
EXPORT_SYMBOL(kernel_recvmsg);
L
Linus Torvalds 已提交
752 753 754 755 756 757

static void sock_aio_dtor(struct kiocb *iocb)
{
	kfree(iocb->private);
}

758 759
static ssize_t sock_sendpage(struct file *file, struct page *page,
			     int offset, size_t size, loff_t *ppos, int more)
L
Linus Torvalds 已提交
760 761 762 763
{
	struct socket *sock;
	int flags;

764 765 766 767 768 769
	sock = file->private_data;

	flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
	if (more)
		flags |= MSG_MORE;

770
	return kernel_sendpage(sock, page, offset, size, flags);
771
}
L
Linus Torvalds 已提交
772

J
Jens Axboe 已提交
773
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
774
				struct pipe_inode_info *pipe, size_t len,
J
Jens Axboe 已提交
775 776 777 778
				unsigned int flags)
{
	struct socket *sock = file->private_data;

779 780 781
	if (unlikely(!sock->ops->splice_read))
		return -EINVAL;

782 783
	sock_update_classid(sock->sk);

J
Jens Axboe 已提交
784 785 786
	return sock->ops->splice_read(sock, ppos, pipe, len, flags);
}

787
static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
788
					 struct sock_iocb *siocb)
789 790 791 792 793
{
	if (!is_sync_kiocb(iocb)) {
		siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
		if (!siocb)
			return NULL;
L
Linus Torvalds 已提交
794 795 796
		iocb->ki_dtor = sock_aio_dtor;
	}

797 798 799
	siocb->kiocb = iocb;
	iocb->private = siocb;
	return siocb;
L
Linus Torvalds 已提交
800 801
}

802
static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
803 804
		struct file *file, const struct iovec *iov,
		unsigned long nr_segs)
805 806 807 808
{
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
809

810 811
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
812

813 814 815 816
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
817
	msg->msg_iov = (struct iovec *)iov;
818 819 820 821 822 823
	msg->msg_iovlen = nr_segs;
	msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;

	return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
}

824 825
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos)
826 827 828
{
	struct sock_iocb siocb, *x;

L
Linus Torvalds 已提交
829 830
	if (pos != 0)
		return -ESPIPE;
831 832

	if (iocb->ki_left == 0)	/* Match SYS5 behaviour */
L
Linus Torvalds 已提交
833 834
		return 0;

835 836

	x = alloc_sock_iocb(iocb, &siocb);
837 838
	if (!x)
		return -ENOMEM;
839
	return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
840 841
}

842
static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
843 844
			struct file *file, const struct iovec *iov,
			unsigned long nr_segs)
L
Linus Torvalds 已提交
845
{
846 847 848
	struct socket *sock = file->private_data;
	size_t size = 0;
	int i;
L
Linus Torvalds 已提交
849

850 851
	for (i = 0; i < nr_segs; i++)
		size += iov[i].iov_len;
L
Linus Torvalds 已提交
852

853 854 855 856
	msg->msg_name = NULL;
	msg->msg_namelen = 0;
	msg->msg_control = NULL;
	msg->msg_controllen = 0;
857
	msg->msg_iov = (struct iovec *)iov;
858 859 860 861
	msg->msg_iovlen = nr_segs;
	msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
	if (sock->type == SOCK_SEQPACKET)
		msg->msg_flags |= MSG_EOR;
L
Linus Torvalds 已提交
862

863
	return __sock_sendmsg(iocb, sock, msg, size);
L
Linus Torvalds 已提交
864 865
}

866 867
static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
			  unsigned long nr_segs, loff_t pos)
868 869
{
	struct sock_iocb siocb, *x;
L
Linus Torvalds 已提交
870

871 872
	if (pos != 0)
		return -ESPIPE;
873 874

	x = alloc_sock_iocb(iocb, &siocb);
875 876
	if (!x)
		return -ENOMEM;
L
Linus Torvalds 已提交
877

878
	return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
L
Linus Torvalds 已提交
879 880 881 882 883 884 885
}

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

A
Arjan van de Ven 已提交
886
static DEFINE_MUTEX(br_ioctl_mutex);
887
static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
L
Linus Torvalds 已提交
888

889
void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
L
Linus Torvalds 已提交
890
{
A
Arjan van de Ven 已提交
891
	mutex_lock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
892
	br_ioctl_hook = hook;
A
Arjan van de Ven 已提交
893
	mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
894 895 896
}
EXPORT_SYMBOL(brioctl_set);

A
Arjan van de Ven 已提交
897
static DEFINE_MUTEX(vlan_ioctl_mutex);
898
static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
L
Linus Torvalds 已提交
899

900
void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
L
Linus Torvalds 已提交
901
{
A
Arjan van de Ven 已提交
902
	mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
903
	vlan_ioctl_hook = hook;
A
Arjan van de Ven 已提交
904
	mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
905 906 907
}
EXPORT_SYMBOL(vlan_ioctl_set);

A
Arjan van de Ven 已提交
908
static DEFINE_MUTEX(dlci_ioctl_mutex);
909
static int (*dlci_ioctl_hook) (unsigned int, void __user *);
L
Linus Torvalds 已提交
910

911
void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
L
Linus Torvalds 已提交
912
{
A
Arjan van de Ven 已提交
913
	mutex_lock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
914
	dlci_ioctl_hook = hook;
A
Arjan van de Ven 已提交
915
	mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
916 917 918
}
EXPORT_SYMBOL(dlci_ioctl_set);

919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
static long sock_do_ioctl(struct net *net, struct socket *sock,
				 unsigned int cmd, unsigned long arg)
{
	int err;
	void __user *argp = (void __user *)arg;

	err = sock->ops->ioctl(sock, cmd, arg);

	/*
	 * If this ioctl is unknown try to hand it down
	 * to the NIC driver.
	 */
	if (err == -ENOIOCTLCMD)
		err = dev_ioctl(net, cmd, argp);

	return err;
}

L
Linus Torvalds 已提交
937 938 939 940 941 942 943 944
/*
 *	With an ioctl, arg may well be a user mode pointer, but we don't know
 *	what to do with it - that's up to the protocol still.
 */

static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
	struct socket *sock;
945
	struct sock *sk;
L
Linus Torvalds 已提交
946 947
	void __user *argp = (void __user *)arg;
	int pid, err;
948
	struct net *net;
L
Linus Torvalds 已提交
949

950
	sock = file->private_data;
951
	sk = sock->sk;
952
	net = sock_net(sk);
L
Linus Torvalds 已提交
953
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
954
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
955
	} else
J
Johannes Berg 已提交
956
#ifdef CONFIG_WEXT_CORE
L
Linus Torvalds 已提交
957
	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
958
		err = dev_ioctl(net, cmd, argp);
L
Linus Torvalds 已提交
959
	} else
J
Johannes Berg 已提交
960
#endif
961
		switch (cmd) {
L
Linus Torvalds 已提交
962 963 964 965 966 967 968 969 970
		case FIOSETOWN:
		case SIOCSPGRP:
			err = -EFAULT;
			if (get_user(pid, (int __user *)argp))
				break;
			err = f_setown(sock->file, pid, 1);
			break;
		case FIOGETOWN:
		case SIOCGPGRP:
971
			err = put_user(f_getown(sock->file),
972
				       (int __user *)argp);
L
Linus Torvalds 已提交
973 974 975 976 977 978 979 980 981
			break;
		case SIOCGIFBR:
		case SIOCSIFBR:
		case SIOCBRADDBR:
		case SIOCBRDELBR:
			err = -ENOPKG;
			if (!br_ioctl_hook)
				request_module("bridge");

A
Arjan van de Ven 已提交
982
			mutex_lock(&br_ioctl_mutex);
983
			if (br_ioctl_hook)
984
				err = br_ioctl_hook(net, cmd, argp);
A
Arjan van de Ven 已提交
985
			mutex_unlock(&br_ioctl_mutex);
L
Linus Torvalds 已提交
986 987 988 989 990 991 992
			break;
		case SIOCGIFVLAN:
		case SIOCSIFVLAN:
			err = -ENOPKG;
			if (!vlan_ioctl_hook)
				request_module("8021q");

A
Arjan van de Ven 已提交
993
			mutex_lock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
994
			if (vlan_ioctl_hook)
995
				err = vlan_ioctl_hook(net, argp);
A
Arjan van de Ven 已提交
996
			mutex_unlock(&vlan_ioctl_mutex);
L
Linus Torvalds 已提交
997 998 999 1000 1001 1002 1003
			break;
		case SIOCADDDLCI:
		case SIOCDELDLCI:
			err = -ENOPKG;
			if (!dlci_ioctl_hook)
				request_module("dlci");

1004 1005
			mutex_lock(&dlci_ioctl_mutex);
			if (dlci_ioctl_hook)
L
Linus Torvalds 已提交
1006
				err = dlci_ioctl_hook(cmd, argp);
1007
			mutex_unlock(&dlci_ioctl_mutex);
L
Linus Torvalds 已提交
1008 1009
			break;
		default:
1010
			err = sock_do_ioctl(net, sock, cmd, arg);
L
Linus Torvalds 已提交
1011
			break;
1012
		}
L
Linus Torvalds 已提交
1013 1014 1015 1016 1017 1018 1019
	return err;
}

int sock_create_lite(int family, int type, int protocol, struct socket **res)
{
	int err;
	struct socket *sock = NULL;
1020

L
Linus Torvalds 已提交
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
	err = security_socket_create(family, type, protocol, 1);
	if (err)
		goto out;

	sock = sock_alloc();
	if (!sock) {
		err = -ENOMEM;
		goto out;
	}

	sock->type = type;
V
Venkat Yekkirala 已提交
1032 1033 1034 1035
	err = security_socket_post_create(sock, family, type, protocol, 1);
	if (err)
		goto out_release;

L
Linus Torvalds 已提交
1036 1037 1038
out:
	*res = sock;
	return err;
V
Venkat Yekkirala 已提交
1039 1040 1041 1042
out_release:
	sock_release(sock);
	sock = NULL;
	goto out;
L
Linus Torvalds 已提交
1043
}
1044
EXPORT_SYMBOL(sock_create_lite);
L
Linus Torvalds 已提交
1045 1046

/* No kernel lock held - perfect */
1047
static unsigned int sock_poll(struct file *file, poll_table *wait)
L
Linus Torvalds 已提交
1048 1049 1050 1051
{
	struct socket *sock;

	/*
1052
	 *      We can't return errors to poll, so it's either yes or no.
L
Linus Torvalds 已提交
1053
	 */
1054
	sock = file->private_data;
L
Linus Torvalds 已提交
1055 1056 1057
	return sock->ops->poll(file, sock, wait);
}

1058
static int sock_mmap(struct file *file, struct vm_area_struct *vma)
L
Linus Torvalds 已提交
1059
{
1060
	struct socket *sock = file->private_data;
L
Linus Torvalds 已提交
1061 1062 1063 1064

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

1065
static int sock_close(struct inode *inode, struct file *filp)
L
Linus Torvalds 已提交
1066 1067
{
	/*
1068 1069
	 *      It was possible the inode is NULL we were
	 *      closing an unfinished socket.
L
Linus Torvalds 已提交
1070 1071
	 */

1072
	if (!inode) {
L
Linus Torvalds 已提交
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
		printk(KERN_DEBUG "sock_close: NULL inode\n");
		return 0;
	}
	sock_release(SOCKET_I(inode));
	return 0;
}

/*
 *	Update the socket async list
 *
 *	Fasync_list locking strategy.
 *
 *	1. fasync_list is modified only under process context socket lock
 *	   i.e. under semaphore.
 *	2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1088
 *	   or under socket lock
L
Linus Torvalds 已提交
1089 1090 1091 1092
 */

static int sock_fasync(int fd, struct file *filp, int on)
{
1093 1094
	struct socket *sock = filp->private_data;
	struct sock *sk = sock->sk;
L
Linus Torvalds 已提交
1095

1096
	if (sk == NULL)
L
Linus Torvalds 已提交
1097 1098 1099 1100
		return -EINVAL;

	lock_sock(sk);

1101
	fasync_helper(fd, filp, on, &sock->wq->fasync_list);
L
Linus Torvalds 已提交
1102

1103
	if (!sock->wq->fasync_list)
1104 1105
		sock_reset_flag(sk, SOCK_FASYNC);
	else
E
Eric Dumazet 已提交
1106
		sock_set_flag(sk, SOCK_FASYNC);
L
Linus Torvalds 已提交
1107

1108
	release_sock(sk);
L
Linus Torvalds 已提交
1109 1110 1111
	return 0;
}

1112
/* This function may be called only under socket lock or callback_lock or rcu_lock */
L
Linus Torvalds 已提交
1113 1114 1115

int sock_wake_async(struct socket *sock, int how, int band)
{
1116 1117 1118 1119 1120 1121 1122 1123
	struct socket_wq *wq;

	if (!sock)
		return -1;
	rcu_read_lock();
	wq = rcu_dereference(sock->wq);
	if (!wq || !wq->fasync_list) {
		rcu_read_unlock();
L
Linus Torvalds 已提交
1124
		return -1;
1125
	}
1126
	switch (how) {
1127
	case SOCK_WAKE_WAITD:
L
Linus Torvalds 已提交
1128 1129 1130
		if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
			break;
		goto call_kill;
1131
	case SOCK_WAKE_SPACE:
L
Linus Torvalds 已提交
1132 1133 1134
		if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
			break;
		/* fall through */
1135
	case SOCK_WAKE_IO:
1136
call_kill:
1137
		kill_fasync(&wq->fasync_list, SIGIO, band);
L
Linus Torvalds 已提交
1138
		break;
1139
	case SOCK_WAKE_URG:
1140
		kill_fasync(&wq->fasync_list, SIGURG, band);
L
Linus Torvalds 已提交
1141
	}
1142
	rcu_read_unlock();
L
Linus Torvalds 已提交
1143 1144
	return 0;
}
1145
EXPORT_SYMBOL(sock_wake_async);
L
Linus Torvalds 已提交
1146

1147
static int __sock_create(struct net *net, int family, int type, int protocol,
1148
			 struct socket **res, int kern)
L
Linus Torvalds 已提交
1149 1150 1151
{
	int err;
	struct socket *sock;
1152
	const struct net_proto_family *pf;
L
Linus Torvalds 已提交
1153 1154

	/*
1155
	 *      Check protocol is in range
L
Linus Torvalds 已提交
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
	 */
	if (family < 0 || family >= NPROTO)
		return -EAFNOSUPPORT;
	if (type < 0 || type >= SOCK_MAX)
		return -EINVAL;

	/* Compatibility.

	   This uglymoron is moved from INET layer to here to avoid
	   deadlock in module load.
	 */
	if (family == PF_INET && type == SOCK_PACKET) {
1168
		static int warned;
L
Linus Torvalds 已提交
1169 1170
		if (!warned) {
			warned = 1;
1171 1172
			printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
			       current->comm);
L
Linus Torvalds 已提交
1173 1174 1175 1176 1177 1178 1179
		}
		family = PF_PACKET;
	}

	err = security_socket_create(family, type, protocol, kern);
	if (err)
		return err;
1180

1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195
	/*
	 *	Allocate the socket and allow the family to set things up. if
	 *	the protocol is 0, the family is instructed to select an appropriate
	 *	default.
	 */
	sock = sock_alloc();
	if (!sock) {
		if (net_ratelimit())
			printk(KERN_WARNING "socket: no more sockets\n");
		return -ENFILE;	/* Not exactly a match, but its the
				   closest posix thing */
	}

	sock->type = type;

1196
#ifdef CONFIG_MODULES
1197 1198 1199
	/* Attempt to load a protocol module if the find failed.
	 *
	 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
L
Linus Torvalds 已提交
1200 1201 1202
	 * requested real, full-featured networking support upon configuration.
	 * Otherwise module support will break!
	 */
1203
	if (net_families[family] == NULL)
1204
		request_module("net-pf-%d", family);
L
Linus Torvalds 已提交
1205 1206
#endif

1207 1208 1209 1210 1211
	rcu_read_lock();
	pf = rcu_dereference(net_families[family]);
	err = -EAFNOSUPPORT;
	if (!pf)
		goto out_release;
L
Linus Torvalds 已提交
1212 1213 1214 1215 1216

	/*
	 * We will call the ->create function, that possibly is in a loadable
	 * module, so we have to bump that loadable module refcnt first.
	 */
1217
	if (!try_module_get(pf->owner))
L
Linus Torvalds 已提交
1218 1219
		goto out_release;

1220 1221 1222
	/* Now protected by module ref count */
	rcu_read_unlock();

1223
	err = pf->create(net, sock, protocol, kern);
1224
	if (err < 0)
L
Linus Torvalds 已提交
1225
		goto out_module_put;
1226

L
Linus Torvalds 已提交
1227 1228 1229 1230
	/*
	 * Now to bump the refcnt of the [loadable] module that owns this
	 * socket at sock_release time we decrement its refcnt.
	 */
1231 1232 1233
	if (!try_module_get(sock->ops->owner))
		goto out_module_busy;

L
Linus Torvalds 已提交
1234 1235 1236 1237
	/*
	 * Now that we're done with the ->create function, the [loadable]
	 * module can have its refcnt decremented
	 */
1238
	module_put(pf->owner);
V
Venkat Yekkirala 已提交
1239 1240
	err = security_socket_post_create(sock, family, type, protocol, kern);
	if (err)
1241
		goto out_sock_release;
1242
	*res = sock;
L
Linus Torvalds 已提交
1243

1244 1245 1246 1247
	return 0;

out_module_busy:
	err = -EAFNOSUPPORT;
L
Linus Torvalds 已提交
1248
out_module_put:
1249 1250 1251
	sock->ops = NULL;
	module_put(pf->owner);
out_sock_release:
L
Linus Torvalds 已提交
1252
	sock_release(sock);
1253 1254 1255 1256 1257
	return err;

out_release:
	rcu_read_unlock();
	goto out_sock_release;
L
Linus Torvalds 已提交
1258 1259 1260 1261
}

int sock_create(int family, int type, int protocol, struct socket **res)
{
1262
	return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
L
Linus Torvalds 已提交
1263
}
1264
EXPORT_SYMBOL(sock_create);
L
Linus Torvalds 已提交
1265 1266 1267

int sock_create_kern(int family, int type, int protocol, struct socket **res)
{
1268
	return __sock_create(&init_net, family, type, protocol, res, 1);
L
Linus Torvalds 已提交
1269
}
1270
EXPORT_SYMBOL(sock_create_kern);
L
Linus Torvalds 已提交
1271

1272
SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
L
Linus Torvalds 已提交
1273 1274 1275
{
	int retval;
	struct socket *sock;
1276 1277
	int flags;

1278 1279 1280 1281 1282 1283
	/* Check the SOCK_* constants for consistency.  */
	BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
	BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
	BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
	BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);

1284
	flags = type & ~SOCK_TYPE_MASK;
1285
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1286 1287
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1288

U
Ulrich Drepper 已提交
1289 1290 1291
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1292 1293 1294 1295
	retval = sock_create(family, type, protocol, &sock);
	if (retval < 0)
		goto out;

1296
	retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
L
Linus Torvalds 已提交
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
	if (retval < 0)
		goto out_release;

out:
	/* It may be already another descriptor 8) Not kernel problem. */
	return retval;

out_release:
	sock_release(sock);
	return retval;
}

/*
 *	Create a pair of connected sockets.
 */

1313 1314
SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
		int __user *, usockvec)
L
Linus Torvalds 已提交
1315 1316 1317
{
	struct socket *sock1, *sock2;
	int fd1, fd2, err;
A
Al Viro 已提交
1318
	struct file *newfile1, *newfile2;
1319 1320 1321
	int flags;

	flags = type & ~SOCK_TYPE_MASK;
1322
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1323 1324
		return -EINVAL;
	type &= SOCK_TYPE_MASK;
L
Linus Torvalds 已提交
1325

U
Ulrich Drepper 已提交
1326 1327 1328
	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;

L
Linus Torvalds 已提交
1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
	/*
	 * Obtain the first socket and check if the underlying protocol
	 * supports the socketpair call.
	 */

	err = sock_create(family, type, protocol, &sock1);
	if (err < 0)
		goto out;

	err = sock_create(family, type, protocol, &sock2);
	if (err < 0)
		goto out_release_1;

	err = sock1->ops->socketpair(sock1, sock2);
1343
	if (err < 0)
L
Linus Torvalds 已提交
1344 1345
		goto out_release_both;

1346
	fd1 = sock_alloc_file(sock1, &newfile1, flags);
1347 1348
	if (unlikely(fd1 < 0)) {
		err = fd1;
A
Al Viro 已提交
1349
		goto out_release_both;
1350
	}
L
Linus Torvalds 已提交
1351

1352
	fd2 = sock_alloc_file(sock2, &newfile2, flags);
1353 1354 1355 1356 1357 1358
	if (unlikely(fd2 < 0)) {
		err = fd2;
		fput(newfile1);
		put_unused_fd(fd1);
		sock_release(sock2);
		goto out;
A
Al Viro 已提交
1359 1360
	}

A
Al Viro 已提交
1361
	audit_fd_pair(fd1, fd2);
A
Al Viro 已提交
1362 1363
	fd_install(fd1, newfile1);
	fd_install(fd2, newfile2);
L
Linus Torvalds 已提交
1364 1365 1366 1367
	/* fd1 and fd2 may be already another descriptors.
	 * Not kernel problem.
	 */

1368
	err = put_user(fd1, &usockvec[0]);
L
Linus Torvalds 已提交
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
	if (!err)
		err = put_user(fd2, &usockvec[1]);
	if (!err)
		return 0;

	sys_close(fd2);
	sys_close(fd1);
	return err;

out_release_both:
1379
	sock_release(sock2);
L
Linus Torvalds 已提交
1380
out_release_1:
1381
	sock_release(sock1);
L
Linus Torvalds 已提交
1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
out:
	return err;
}

/*
 *	Bind a name to a socket. Nothing much to do here since it's
 *	the protocol's responsibility to handle the local address.
 *
 *	We move the socket address to kernel space before we call
 *	the protocol layer (having also checked the address is ok).
 */

1394
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
L
Linus Torvalds 已提交
1395 1396
{
	struct socket *sock;
1397
	struct sockaddr_storage address;
1398
	int err, fput_needed;
L
Linus Torvalds 已提交
1399

1400
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1401
	if (sock) {
1402
		err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
1403 1404
		if (err >= 0) {
			err = security_socket_bind(sock,
1405
						   (struct sockaddr *)&address,
1406
						   addrlen);
1407 1408
			if (!err)
				err = sock->ops->bind(sock,
1409
						      (struct sockaddr *)
1410
						      &address, addrlen);
L
Linus Torvalds 已提交
1411
		}
1412
		fput_light(sock->file, fput_needed);
1413
	}
L
Linus Torvalds 已提交
1414 1415 1416 1417 1418 1419 1420 1421 1422
	return err;
}

/*
 *	Perform a listen. Basically, we allow the protocol to do anything
 *	necessary for a listen, and if that works, we mark the socket as
 *	ready for listening.
 */

1423
SYSCALL_DEFINE2(listen, int, fd, int, backlog)
L
Linus Torvalds 已提交
1424 1425
{
	struct socket *sock;
1426
	int err, fput_needed;
1427
	int somaxconn;
1428 1429 1430

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock) {
1431
		somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1432 1433
		if ((unsigned)backlog > somaxconn)
			backlog = somaxconn;
L
Linus Torvalds 已提交
1434 1435

		err = security_socket_listen(sock, backlog);
1436 1437
		if (!err)
			err = sock->ops->listen(sock, backlog);
L
Linus Torvalds 已提交
1438

1439
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
	}
	return err;
}

/*
 *	For accept, we attempt to create a new socket, set up the link
 *	with the client, wake up the client, then return the new
 *	connected fd. We collect the address of the connector in kernel
 *	space and move it to user at the very end. This is unclean because
 *	we open the socket then return an error.
 *
 *	1003.1g adds the ability to recvmsg() to query connection pending
 *	status to recvmsg. We need to add that support in a way thats
 *	clean when we restucture accept also.
 */

1456 1457
SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen, int, flags)
L
Linus Torvalds 已提交
1458 1459
{
	struct socket *sock, *newsock;
1460
	struct file *newfile;
1461
	int err, len, newfd, fput_needed;
1462
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1463

1464
	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
U
Ulrich Drepper 已提交
1465 1466 1467 1468 1469
		return -EINVAL;

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

1470
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1471 1472 1473 1474
	if (!sock)
		goto out;

	err = -ENFILE;
1475 1476
	newsock = sock_alloc();
	if (!newsock)
L
Linus Torvalds 已提交
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487
		goto out_put;

	newsock->type = sock->type;
	newsock->ops = sock->ops;

	/*
	 * We don't need try_module_get here, as the listening socket (sock)
	 * has the protocol module (sock->ops->owner) held.
	 */
	__module_get(newsock->ops->owner);

1488
	newfd = sock_alloc_file(newsock, &newfile, flags);
1489 1490
	if (unlikely(newfd < 0)) {
		err = newfd;
1491 1492
		sock_release(newsock);
		goto out_put;
1493 1494
	}

1495 1496
	err = security_socket_accept(sock, newsock);
	if (err)
1497
		goto out_fd;
1498

L
Linus Torvalds 已提交
1499 1500
	err = sock->ops->accept(sock, newsock, sock->file->f_flags);
	if (err < 0)
1501
		goto out_fd;
L
Linus Torvalds 已提交
1502 1503

	if (upeer_sockaddr) {
1504
		if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1505
					  &len, 2) < 0) {
L
Linus Torvalds 已提交
1506
			err = -ECONNABORTED;
1507
			goto out_fd;
L
Linus Torvalds 已提交
1508
		}
1509 1510
		err = move_addr_to_user((struct sockaddr *)&address,
					len, upeer_sockaddr, upeer_addrlen);
L
Linus Torvalds 已提交
1511
		if (err < 0)
1512
			goto out_fd;
L
Linus Torvalds 已提交
1513 1514 1515 1516
	}

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

1517 1518
	fd_install(newfd, newfile);
	err = newfd;
L
Linus Torvalds 已提交
1519 1520

out_put:
1521
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1522 1523
out:
	return err;
1524
out_fd:
1525
	fput(newfile);
1526
	put_unused_fd(newfd);
L
Linus Torvalds 已提交
1527 1528 1529
	goto out_put;
}

1530 1531
SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
		int __user *, upeer_addrlen)
U
Ulrich Drepper 已提交
1532
{
U
Ulrich Drepper 已提交
1533
	return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
U
Ulrich Drepper 已提交
1534 1535
}

L
Linus Torvalds 已提交
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
/*
 *	Attempt to connect to a socket with the server address.  The address
 *	is in user space so we verify it is OK and move it to kernel space.
 *
 *	For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
 *	break bindings
 *
 *	NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
 *	other SEQPACKET protocols that take time to connect() as it doesn't
 *	include the -EINPROGRESS status for such sockets.
 */

1548 1549
SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
		int, addrlen)
L
Linus Torvalds 已提交
1550 1551
{
	struct socket *sock;
1552
	struct sockaddr_storage address;
1553
	int err, fput_needed;
L
Linus Torvalds 已提交
1554

1555
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1556 1557
	if (!sock)
		goto out;
1558
	err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
L
Linus Torvalds 已提交
1559 1560 1561
	if (err < 0)
		goto out_put;

1562
	err =
1563
	    security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
L
Linus Torvalds 已提交
1564 1565 1566
	if (err)
		goto out_put;

1567
	err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
L
Linus Torvalds 已提交
1568 1569
				 sock->file->f_flags);
out_put:
1570
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1571 1572 1573 1574 1575 1576 1577 1578 1579
out:
	return err;
}

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

1580 1581
SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1582 1583
{
	struct socket *sock;
1584
	struct sockaddr_storage address;
1585
	int len, err, fput_needed;
1586

1587
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1588 1589 1590 1591 1592 1593 1594
	if (!sock)
		goto out;

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

1595
	err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
L
Linus Torvalds 已提交
1596 1597
	if (err)
		goto out_put;
1598
	err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
L
Linus Torvalds 已提交
1599 1600

out_put:
1601
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1602 1603 1604 1605 1606 1607 1608 1609 1610
out:
	return err;
}

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

1611 1612
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
		int __user *, usockaddr_len)
L
Linus Torvalds 已提交
1613 1614
{
	struct socket *sock;
1615
	struct sockaddr_storage address;
1616
	int len, err, fput_needed;
L
Linus Torvalds 已提交
1617

1618 1619
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1620 1621
		err = security_socket_getpeername(sock);
		if (err) {
1622
			fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1623 1624 1625
			return err;
		}

1626
		err =
1627
		    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1628
				       1);
L
Linus Torvalds 已提交
1629
		if (!err)
1630
			err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
1631
						usockaddr_len);
1632
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
	}
	return err;
}

/*
 *	Send a datagram to a given address. We move the address into kernel
 *	space and check the user space data area is readable before invoking
 *	the protocol.
 */

1643 1644 1645
SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
		unsigned, flags, struct sockaddr __user *, addr,
		int, addr_len)
L
Linus Torvalds 已提交
1646 1647
{
	struct socket *sock;
1648
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1649 1650 1651
	int err;
	struct msghdr msg;
	struct iovec iov;
1652 1653
	int fput_needed;

1654 1655
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (!sock)
1656
		goto out;
1657

1658 1659 1660 1661 1662 1663 1664 1665
	iov.iov_base = buff;
	iov.iov_len = len;
	msg.msg_name = NULL;
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_namelen = 0;
1666
	if (addr) {
1667
		err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
L
Linus Torvalds 已提交
1668 1669
		if (err < 0)
			goto out_put;
1670
		msg.msg_name = (struct sockaddr *)&address;
1671
		msg.msg_namelen = addr_len;
L
Linus Torvalds 已提交
1672 1673 1674 1675 1676 1677
	}
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
	msg.msg_flags = flags;
	err = sock_sendmsg(sock, &msg, len);

1678
out_put:
1679
	fput_light(sock->file, fput_needed);
1680
out:
L
Linus Torvalds 已提交
1681 1682 1683 1684
	return err;
}

/*
1685
 *	Send a datagram down a socket.
L
Linus Torvalds 已提交
1686 1687
 */

1688 1689
SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
		unsigned, flags)
L
Linus Torvalds 已提交
1690 1691 1692 1693 1694
{
	return sys_sendto(fd, buff, len, flags, NULL, 0);
}

/*
1695
 *	Receive a frame from the socket and optionally record the address of the
L
Linus Torvalds 已提交
1696 1697 1698 1699
 *	sender. We verify the buffers are writable and if needed move the
 *	sender address from kernel to user space.
 */

1700 1701 1702
SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
		unsigned, flags, struct sockaddr __user *, addr,
		int __user *, addr_len)
L
Linus Torvalds 已提交
1703 1704 1705 1706
{
	struct socket *sock;
	struct iovec iov;
	struct msghdr msg;
1707
	struct sockaddr_storage address;
1708
	int err, err2;
1709 1710
	int fput_needed;

1711
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
L
Linus Torvalds 已提交
1712
	if (!sock)
1713
		goto out;
L
Linus Torvalds 已提交
1714

1715 1716 1717 1718 1719 1720
	msg.msg_control = NULL;
	msg.msg_controllen = 0;
	msg.msg_iovlen = 1;
	msg.msg_iov = &iov;
	iov.iov_len = size;
	iov.iov_base = ubuf;
1721 1722
	msg.msg_name = (struct sockaddr *)&address;
	msg.msg_namelen = sizeof(address);
L
Linus Torvalds 已提交
1723 1724
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
1725
	err = sock_recvmsg(sock, &msg, size, flags);
L
Linus Torvalds 已提交
1726

1727
	if (err >= 0 && addr != NULL) {
1728 1729
		err2 = move_addr_to_user((struct sockaddr *)&address,
					 msg.msg_namelen, addr, addr_len);
1730 1731
		if (err2 < 0)
			err = err2;
L
Linus Torvalds 已提交
1732
	}
1733 1734

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

/*
1740
 *	Receive a datagram from a socket.
L
Linus Torvalds 已提交
1741 1742
 */

1743 1744
asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
			 unsigned flags)
L
Linus Torvalds 已提交
1745 1746 1747 1748 1749 1750 1751 1752 1753
{
	return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
}

/*
 *	Set a socket option. Because we don't know the option lengths we have
 *	to pass the user mode parameter for the protocols to sort out.
 */

1754 1755
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int, optlen)
L
Linus Torvalds 已提交
1756
{
1757
	int err, fput_needed;
L
Linus Torvalds 已提交
1758 1759 1760 1761
	struct socket *sock;

	if (optlen < 0)
		return -EINVAL;
1762 1763 1764 1765

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
		err = security_socket_setsockopt(sock, level, optname);
1766 1767
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1768 1769

		if (level == SOL_SOCKET)
1770 1771 1772
			err =
			    sock_setsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1773
		else
1774 1775 1776
			err =
			    sock->ops->setsockopt(sock, level, optname, optval,
						  optlen);
1777 1778
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1779 1780 1781 1782 1783 1784 1785 1786 1787
	}
	return err;
}

/*
 *	Get a socket option. Because we don't know the option lengths we have
 *	to pass a user mode parameter for the protocols to sort out.
 */

1788 1789
SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
		char __user *, optval, int __user *, optlen)
L
Linus Torvalds 已提交
1790
{
1791
	int err, fput_needed;
L
Linus Torvalds 已提交
1792 1793
	struct socket *sock;

1794 1795
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
1796 1797 1798
		err = security_socket_getsockopt(sock, level, optname);
		if (err)
			goto out_put;
L
Linus Torvalds 已提交
1799 1800

		if (level == SOL_SOCKET)
1801 1802 1803
			err =
			    sock_getsockopt(sock, level, optname, optval,
					    optlen);
L
Linus Torvalds 已提交
1804
		else
1805 1806 1807
			err =
			    sock->ops->getsockopt(sock, level, optname, optval,
						  optlen);
1808 1809
out_put:
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1810 1811 1812 1813 1814 1815 1816 1817
	}
	return err;
}

/*
 *	Shutdown a socket.
 */

1818
SYSCALL_DEFINE2(shutdown, int, fd, int, how)
L
Linus Torvalds 已提交
1819
{
1820
	int err, fput_needed;
L
Linus Torvalds 已提交
1821 1822
	struct socket *sock;

1823 1824
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock != NULL) {
L
Linus Torvalds 已提交
1825
		err = security_socket_shutdown(sock, how);
1826 1827 1828
		if (!err)
			err = sock->ops->shutdown(sock, how);
		fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
1829 1830 1831 1832
	}
	return err;
}

1833
/* A couple of helpful macros for getting the address of the 32/64 bit
L
Linus Torvalds 已提交
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843
 * fields which are the same type (int / unsigned) on our platforms.
 */
#define COMPAT_MSG(msg, member)	((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
#define COMPAT_NAMELEN(msg)	COMPAT_MSG(msg, msg_namelen)
#define COMPAT_FLAGS(msg)	COMPAT_MSG(msg, msg_flags)

/*
 *	BSD sendmsg interface
 */

1844
SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
L
Linus Torvalds 已提交
1845
{
1846 1847
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
L
Linus Torvalds 已提交
1848
	struct socket *sock;
1849
	struct sockaddr_storage address;
L
Linus Torvalds 已提交
1850
	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1851
	unsigned char ctl[sizeof(struct cmsghdr) + 20]
1852 1853
	    __attribute__ ((aligned(sizeof(__kernel_size_t))));
	/* 20 is size of ipv6_pktinfo */
L
Linus Torvalds 已提交
1854 1855 1856
	unsigned char *ctl_buf = ctl;
	struct msghdr msg_sys;
	int err, ctl_len, iov_size, total_len;
1857
	int fput_needed;
1858

L
Linus Torvalds 已提交
1859 1860 1861 1862
	err = -EFAULT;
	if (MSG_CMSG_COMPAT & flags) {
		if (get_compat_msghdr(&msg_sys, msg_compat))
			return -EFAULT;
1863
	} else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
L
Linus Torvalds 已提交
1864 1865
		return -EFAULT;

1866
	sock = sockfd_lookup_light(fd, &err, &fput_needed);
1867
	if (!sock)
L
Linus Torvalds 已提交
1868 1869 1870 1871 1872 1873 1874
		goto out;

	/* do not move before msg_sys is valid */
	err = -EMSGSIZE;
	if (msg_sys.msg_iovlen > UIO_MAXIOV)
		goto out_put;

1875
	/* Check whether to allocate the iovec area */
L
Linus Torvalds 已提交
1876 1877 1878 1879 1880 1881 1882 1883 1884 1885
	err = -ENOMEM;
	iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
	if (msg_sys.msg_iovlen > UIO_FASTIOV) {
		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
		if (!iov)
			goto out_put;
	}

	/* This will also move the address data into kernel space */
	if (MSG_CMSG_COMPAT & flags) {
1886 1887 1888
		err = verify_compat_iovec(&msg_sys, iov,
					  (struct sockaddr *)&address,
					  VERIFY_READ);
L
Linus Torvalds 已提交
1889
	} else
1890 1891 1892
		err = verify_iovec(&msg_sys, iov,
				   (struct sockaddr *)&address,
				   VERIFY_READ);
1893
	if (err < 0)
L
Linus Torvalds 已提交
1894 1895 1896 1897 1898 1899 1900
		goto out_freeiov;
	total_len = err;

	err = -ENOBUFS;

	if (msg_sys.msg_controllen > INT_MAX)
		goto out_freeiov;
1901
	ctl_len = msg_sys.msg_controllen;
L
Linus Torvalds 已提交
1902
	if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1903 1904 1905
		err =
		    cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
						     sizeof(ctl));
L
Linus Torvalds 已提交
1906 1907 1908
		if (err)
			goto out_freeiov;
		ctl_buf = msg_sys.msg_control;
A
Al Viro 已提交
1909
		ctl_len = msg_sys.msg_controllen;
L
Linus Torvalds 已提交
1910
	} else if (ctl_len) {
1911
		if (ctl_len > sizeof(ctl)) {
L
Linus Torvalds 已提交
1912
			ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1913
			if (ctl_buf == NULL)
L
Linus Torvalds 已提交
1914 1915 1916 1917 1918 1919 1920 1921
				goto out_freeiov;
		}
		err = -EFAULT;
		/*
		 * Careful! Before this, msg_sys.msg_control contains a user pointer.
		 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
		 * checking falls down on this.
		 */
1922 1923
		if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
				   ctl_len))
L
Linus Torvalds 已提交
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933
			goto out_freectl;
		msg_sys.msg_control = ctl_buf;
	}
	msg_sys.msg_flags = flags;

	if (sock->file->f_flags & O_NONBLOCK)
		msg_sys.msg_flags |= MSG_DONTWAIT;
	err = sock_sendmsg(sock, &msg_sys, total_len);

out_freectl:
1934
	if (ctl_buf != ctl)
L
Linus Torvalds 已提交
1935 1936 1937 1938 1939
		sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
	if (iov != iovstack)
		sock_kfree_s(sock->sk, iov, iov_size);
out_put:
1940
	fput_light(sock->file, fput_needed);
1941
out:
L
Linus Torvalds 已提交
1942 1943 1944
	return err;
}

1945 1946
static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
			 struct msghdr *msg_sys, unsigned flags, int nosec)
L
Linus Torvalds 已提交
1947
{
1948 1949
	struct compat_msghdr __user *msg_compat =
	    (struct compat_msghdr __user *)msg;
L
Linus Torvalds 已提交
1950
	struct iovec iovstack[UIO_FASTIOV];
1951
	struct iovec *iov = iovstack;
L
Linus Torvalds 已提交
1952 1953 1954 1955
	unsigned long cmsg_ptr;
	int err, iov_size, total_len, len;

	/* kernel mode address */
1956
	struct sockaddr_storage addr;
L
Linus Torvalds 已提交
1957 1958 1959 1960

	/* user mode address pointers */
	struct sockaddr __user *uaddr;
	int __user *uaddr_len;
1961

L
Linus Torvalds 已提交
1962
	if (MSG_CMSG_COMPAT & flags) {
1963
		if (get_compat_msghdr(msg_sys, msg_compat))
L
Linus Torvalds 已提交
1964
			return -EFAULT;
1965
	} else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
1966
		return -EFAULT;
L
Linus Torvalds 已提交
1967 1968

	err = -EMSGSIZE;
1969 1970
	if (msg_sys->msg_iovlen > UIO_MAXIOV)
		goto out;
1971 1972

	/* Check whether to allocate the iovec area */
L
Linus Torvalds 已提交
1973
	err = -ENOMEM;
1974 1975
	iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
	if (msg_sys->msg_iovlen > UIO_FASTIOV) {
L
Linus Torvalds 已提交
1976 1977
		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
		if (!iov)
1978
			goto out;
L
Linus Torvalds 已提交
1979 1980 1981
	}

	/*
1982 1983
	 *      Save the user-mode address (verify_iovec will change the
	 *      kernel msghdr to use the kernel address space)
L
Linus Torvalds 已提交
1984
	 */
1985

1986
	uaddr = (__force void __user *)msg_sys->msg_name;
L
Linus Torvalds 已提交
1987 1988
	uaddr_len = COMPAT_NAMELEN(msg);
	if (MSG_CMSG_COMPAT & flags) {
1989
		err = verify_compat_iovec(msg_sys, iov,
1990 1991
					  (struct sockaddr *)&addr,
					  VERIFY_WRITE);
L
Linus Torvalds 已提交
1992
	} else
1993
		err = verify_iovec(msg_sys, iov,
1994 1995
				   (struct sockaddr *)&addr,
				   VERIFY_WRITE);
L
Linus Torvalds 已提交
1996 1997
	if (err < 0)
		goto out_freeiov;
1998
	total_len = err;
L
Linus Torvalds 已提交
1999

2000 2001
	cmsg_ptr = (unsigned long)msg_sys->msg_control;
	msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2002

L
Linus Torvalds 已提交
2003 2004
	if (sock->file->f_flags & O_NONBLOCK)
		flags |= MSG_DONTWAIT;
2005 2006
	err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
							  total_len, flags);
L
Linus Torvalds 已提交
2007 2008 2009 2010 2011
	if (err < 0)
		goto out_freeiov;
	len = err;

	if (uaddr != NULL) {
2012
		err = move_addr_to_user((struct sockaddr *)&addr,
2013
					msg_sys->msg_namelen, uaddr,
2014
					uaddr_len);
L
Linus Torvalds 已提交
2015 2016 2017
		if (err < 0)
			goto out_freeiov;
	}
2018
	err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2019
			 COMPAT_FLAGS(msg));
L
Linus Torvalds 已提交
2020 2021 2022
	if (err)
		goto out_freeiov;
	if (MSG_CMSG_COMPAT & flags)
2023
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2024 2025
				 &msg_compat->msg_controllen);
	else
2026
		err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
L
Linus Torvalds 已提交
2027 2028 2029 2030 2031 2032 2033 2034
				 &msg->msg_controllen);
	if (err)
		goto out_freeiov;
	err = len;

out_freeiov:
	if (iov != iovstack)
		sock_kfree_s(sock->sk, iov, iov_size);
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054
out:
	return err;
}

/*
 *	BSD recvmsg interface
 */

SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
		unsigned int, flags)
{
	int fput_needed, err;
	struct msghdr msg_sys;
	struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);

	if (!sock)
		goto out;

	err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);

2055
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
2056 2057 2058 2059
out:
	return err;
}

2060 2061 2062 2063 2064 2065 2066 2067 2068 2069
/*
 *     Linux recvmmsg interface
 */

int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
		   unsigned int flags, struct timespec *timeout)
{
	int fput_needed, err, datagrams;
	struct socket *sock;
	struct mmsghdr __user *entry;
2070
	struct compat_mmsghdr __user *compat_entry;
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089
	struct msghdr msg_sys;
	struct timespec end_time;

	if (timeout &&
	    poll_select_set_timeout(&end_time, timeout->tv_sec,
				    timeout->tv_nsec))
		return -EINVAL;

	datagrams = 0;

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

	err = sock_error(sock->sk);
	if (err)
		goto out_put;

	entry = mmsg;
2090
	compat_entry = (struct compat_mmsghdr __user *)mmsg;
2091 2092 2093 2094 2095

	while (datagrams < vlen) {
		/*
		 * No need to ask LSM for more than the first datagram.
		 */
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111
		if (MSG_CMSG_COMPAT & flags) {
			err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
					    &msg_sys, flags, datagrams);
			if (err < 0)
				break;
			err = __put_user(err, &compat_entry->msg_len);
			++compat_entry;
		} else {
			err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
					    &msg_sys, flags, datagrams);
			if (err < 0)
				break;
			err = put_user(err, &entry->msg_len);
			++entry;
		}

2112 2113 2114 2115
		if (err)
			break;
		++datagrams;

2116 2117 2118 2119
		/* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
		if (flags & MSG_WAITFORONE)
			flags |= MSG_DONTWAIT;

2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139
		if (timeout) {
			ktime_get_ts(timeout);
			*timeout = timespec_sub(end_time, *timeout);
			if (timeout->tv_sec < 0) {
				timeout->tv_sec = timeout->tv_nsec = 0;
				break;
			}

			/* Timeout, return less than vlen datagrams */
			if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
				break;
		}

		/* Out of band data, return right away */
		if (msg_sys.msg_flags & MSG_OOB)
			break;
	}

out_put:
	fput_light(sock->file, fput_needed);
L
Linus Torvalds 已提交
2140

2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187
	if (err == 0)
		return datagrams;

	if (datagrams != 0) {
		/*
		 * We may return less entries than requested (vlen) if the
		 * sock is non block and there aren't enough datagrams...
		 */
		if (err != -EAGAIN) {
			/*
			 * ... or  if recvmsg returns an error after we
			 * received some datagrams, where we record the
			 * error to return on the next call or if the
			 * app asks about it using getsockopt(SO_ERROR).
			 */
			sock->sk->sk_err = -err;
		}

		return datagrams;
	}

	return err;
}

SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
		unsigned int, vlen, unsigned int, flags,
		struct timespec __user *, timeout)
{
	int datagrams;
	struct timespec timeout_sys;

	if (!timeout)
		return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);

	if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
		return -EFAULT;

	datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);

	if (datagrams > 0 &&
	    copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
		datagrams = -EFAULT;

	return datagrams;
}

#ifdef __ARCH_WANT_SYS_SOCKETCALL
L
Linus Torvalds 已提交
2188 2189
/* Argument list sizes for sys_socketcall */
#define AL(x) ((x) * sizeof(unsigned long))
2190
static const unsigned char nargs[20] = {
2191 2192 2193 2194
	AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
	AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
	AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
	AL(4), AL(5)
2195 2196
};

L
Linus Torvalds 已提交
2197 2198 2199
#undef AL

/*
2200
 *	System call vectors.
L
Linus Torvalds 已提交
2201 2202 2203
 *
 *	Argument checking cleaned up. Saved 20% in size.
 *  This function doesn't need to set the kernel lock because
2204
 *  it is set by the callees.
L
Linus Torvalds 已提交
2205 2206
 */

2207
SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
L
Linus Torvalds 已提交
2208 2209
{
	unsigned long a[6];
2210
	unsigned long a0, a1;
L
Linus Torvalds 已提交
2211
	int err;
2212
	unsigned int len;
L
Linus Torvalds 已提交
2213

2214
	if (call < 1 || call > SYS_RECVMMSG)
L
Linus Torvalds 已提交
2215 2216
		return -EINVAL;

2217 2218 2219 2220
	len = nargs[call];
	if (len > sizeof(a))
		return -EINVAL;

L
Linus Torvalds 已提交
2221
	/* copy_from_user should be SMP safe. */
2222
	if (copy_from_user(a, args, len))
L
Linus Torvalds 已提交
2223
		return -EFAULT;
2224

A
Al Viro 已提交
2225
	audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2226

2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243
	a0 = a[0];
	a1 = a[1];

	switch (call) {
	case SYS_SOCKET:
		err = sys_socket(a0, a1, a[2]);
		break;
	case SYS_BIND:
		err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
		break;
	case SYS_CONNECT:
		err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
		break;
	case SYS_LISTEN:
		err = sys_listen(a0, a1);
		break;
	case SYS_ACCEPT:
U
Ulrich Drepper 已提交
2244 2245
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], 0);
2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
		break;
	case SYS_GETSOCKNAME:
		err =
		    sys_getsockname(a0, (struct sockaddr __user *)a1,
				    (int __user *)a[2]);
		break;
	case SYS_GETPEERNAME:
		err =
		    sys_getpeername(a0, (struct sockaddr __user *)a1,
				    (int __user *)a[2]);
		break;
	case SYS_SOCKETPAIR:
		err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
		break;
	case SYS_SEND:
		err = sys_send(a0, (void __user *)a1, a[2], a[3]);
		break;
	case SYS_SENDTO:
		err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
				 (struct sockaddr __user *)a[4], a[5]);
		break;
	case SYS_RECV:
		err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
		break;
	case SYS_RECVFROM:
		err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
				   (struct sockaddr __user *)a[4],
				   (int __user *)a[5]);
		break;
	case SYS_SHUTDOWN:
		err = sys_shutdown(a0, a1);
		break;
	case SYS_SETSOCKOPT:
		err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
		break;
	case SYS_GETSOCKOPT:
		err =
		    sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
				   (int __user *)a[4]);
		break;
	case SYS_SENDMSG:
		err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
		break;
	case SYS_RECVMSG:
		err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
		break;
2292 2293 2294 2295
	case SYS_RECVMMSG:
		err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
				   (struct timespec __user *)a[4]);
		break;
U
Ulrich Drepper 已提交
2296 2297 2298
	case SYS_ACCEPT4:
		err = sys_accept4(a0, (struct sockaddr __user *)a1,
				  (int __user *)a[2], a[3]);
U
Ulrich Drepper 已提交
2299
		break;
2300 2301 2302
	default:
		err = -EINVAL;
		break;
L
Linus Torvalds 已提交
2303 2304 2305 2306
	}
	return err;
}

2307
#endif				/* __ARCH_WANT_SYS_SOCKETCALL */
L
Linus Torvalds 已提交
2308

2309 2310 2311 2312
/**
 *	sock_register - add a socket protocol handler
 *	@ops: description of protocol
 *
L
Linus Torvalds 已提交
2313 2314
 *	This function is called by a protocol handler that wants to
 *	advertise its address family, and have it linked into the
2315 2316
 *	socket interface. The value ops->family coresponds to the
 *	socket system call protocol family.
L
Linus Torvalds 已提交
2317
 */
2318
int sock_register(const struct net_proto_family *ops)
L
Linus Torvalds 已提交
2319 2320 2321 2322
{
	int err;

	if (ops->family >= NPROTO) {
2323 2324
		printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
		       NPROTO);
L
Linus Torvalds 已提交
2325 2326
		return -ENOBUFS;
	}
2327 2328 2329 2330 2331

	spin_lock(&net_family_lock);
	if (net_families[ops->family])
		err = -EEXIST;
	else {
2332
		net_families[ops->family] = ops;
L
Linus Torvalds 已提交
2333 2334
		err = 0;
	}
2335 2336
	spin_unlock(&net_family_lock);

2337
	printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
L
Linus Torvalds 已提交
2338 2339
	return err;
}
2340
EXPORT_SYMBOL(sock_register);
L
Linus Torvalds 已提交
2341

2342 2343 2344 2345
/**
 *	sock_unregister - remove a protocol handler
 *	@family: protocol family to remove
 *
L
Linus Torvalds 已提交
2346 2347
 *	This function is called by a protocol handler that wants to
 *	remove its address family, and have it unlinked from the
2348 2349 2350 2351 2352 2353
 *	new socket creation.
 *
 *	If protocol handler is a module, then it can use module reference
 *	counts to protect against new references. If protocol handler is not
 *	a module then it needs to provide its own protection in
 *	the ops->create routine.
L
Linus Torvalds 已提交
2354
 */
2355
void sock_unregister(int family)
L
Linus Torvalds 已提交
2356
{
2357
	BUG_ON(family < 0 || family >= NPROTO);
L
Linus Torvalds 已提交
2358

2359
	spin_lock(&net_family_lock);
2360
	net_families[family] = NULL;
2361 2362 2363 2364
	spin_unlock(&net_family_lock);

	synchronize_rcu();

2365
	printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
L
Linus Torvalds 已提交
2366
}
2367
EXPORT_SYMBOL(sock_unregister);
L
Linus Torvalds 已提交
2368

2369
static int __init sock_init(void)
L
Linus Torvalds 已提交
2370 2371
{
	/*
2372
	 *      Initialize sock SLAB cache.
L
Linus Torvalds 已提交
2373
	 */
2374

L
Linus Torvalds 已提交
2375 2376 2377
	sk_init();

	/*
2378
	 *      Initialize skbuff SLAB cache
L
Linus Torvalds 已提交
2379 2380 2381 2382
	 */
	skb_init();

	/*
2383
	 *      Initialize the protocols module.
L
Linus Torvalds 已提交
2384 2385 2386 2387 2388
	 */

	init_inodecache();
	register_filesystem(&sock_fs_type);
	sock_mnt = kern_mount(&sock_fs_type);
2389 2390

	/* The real protocol initialization is performed in later initcalls.
L
Linus Torvalds 已提交
2391 2392 2393 2394 2395
	 */

#ifdef CONFIG_NETFILTER
	netfilter_init();
#endif
2396

2397 2398 2399 2400
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
	skb_timestamping_init();
#endif

2401
	return 0;
L
Linus Torvalds 已提交
2402 2403
}

2404 2405
core_initcall(sock_init);	/* early initcall */

L
Linus Torvalds 已提交
2406 2407 2408 2409 2410 2411
#ifdef CONFIG_PROC_FS
void socket_seq_show(struct seq_file *seq)
{
	int cpu;
	int counter = 0;

2412
	for_each_possible_cpu(cpu)
2413
	    counter += per_cpu(sockets_in_use, cpu);
L
Linus Torvalds 已提交
2414 2415 2416 2417 2418 2419 2420

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

	seq_printf(seq, "sockets: used %d\n", counter);
}
2421
#endif				/* CONFIG_PROC_FS */
L
Linus Torvalds 已提交
2422

2423
#ifdef CONFIG_COMPAT
2424 2425
static int do_siocgstamp(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_timeval __user *up)
2426 2427 2428 2429 2430 2431
{
	mm_segment_t old_fs = get_fs();
	struct timeval ktv;
	int err;

	set_fs(KERNEL_DS);
2432
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2433 2434 2435 2436 2437 2438 2439 2440
	set_fs(old_fs);
	if (!err) {
		err = put_user(ktv.tv_sec, &up->tv_sec);
		err |= __put_user(ktv.tv_usec, &up->tv_usec);
	}
	return err;
}

2441 2442
static int do_siocgstampns(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_timespec __user *up)
2443 2444 2445 2446 2447 2448
{
	mm_segment_t old_fs = get_fs();
	struct timespec kts;
	int err;

	set_fs(KERNEL_DS);
2449
	err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2450 2451 2452 2453 2454 2455 2456 2457
	set_fs(old_fs);
	if (!err) {
		err = put_user(kts.tv_sec, &up->tv_sec);
		err |= __put_user(kts.tv_nsec, &up->tv_nsec);
	}
	return err;
}

2458
static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2459 2460 2461 2462 2463
{
	struct ifreq __user *uifr;
	int err;

	uifr = compat_alloc_user_space(sizeof(struct ifreq));
2464
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2465 2466
		return -EFAULT;

2467
	err = dev_ioctl(net, SIOCGIFNAME, uifr);
2468 2469 2470
	if (err)
		return err;

2471
	if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2472 2473 2474 2475 2476
		return -EFAULT;

	return 0;
}

2477
static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2478
{
2479
	struct compat_ifconf ifc32;
2480 2481
	struct ifconf ifc;
	struct ifconf __user *uifc;
2482
	struct compat_ifreq __user *ifr32;
2483 2484 2485 2486
	struct ifreq __user *ifr;
	unsigned int i, j;
	int err;

2487
	if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2488 2489 2490 2491 2492 2493 2494 2495
		return -EFAULT;

	if (ifc32.ifcbuf == 0) {
		ifc32.ifc_len = 0;
		ifc.ifc_len = 0;
		ifc.ifc_req = NULL;
		uifc = compat_alloc_user_space(sizeof(struct ifconf));
	} else {
2496 2497
		size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
			sizeof(struct ifreq);
2498 2499 2500 2501
		uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
		ifc.ifc_len = len;
		ifr = ifc.ifc_req = (void __user *)(uifc + 1);
		ifr32 = compat_ptr(ifc32.ifcbuf);
2502
		for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2503
			if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2504 2505 2506 2507 2508 2509 2510 2511
				return -EFAULT;
			ifr++;
			ifr32++;
		}
	}
	if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
		return -EFAULT;

2512
	err = dev_ioctl(net, SIOCGIFCONF, uifc);
2513 2514 2515 2516 2517 2518 2519 2520 2521
	if (err)
		return err;

	if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
		return -EFAULT;

	ifr = ifc.ifc_req;
	ifr32 = compat_ptr(ifc32.ifcbuf);
	for (i = 0, j = 0;
2522 2523 2524
	     i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
	     i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
		if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2525 2526 2527 2528 2529 2530 2531 2532 2533 2534
			return -EFAULT;
		ifr32++;
		ifr++;
	}

	if (ifc32.ifcbuf == 0) {
		/* Translate from 64-bit structure multiple to
		 * a 32-bit one.
		 */
		i = ifc.ifc_len;
2535
		i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2536 2537 2538 2539
		ifc32.ifc_len = i;
	} else {
		ifc32.ifc_len = i;
	}
2540
	if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2541 2542 2543 2544 2545
		return -EFAULT;

	return 0;
}

2546
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563
{
	struct ifreq __user *ifr;
	u32 data;
	void __user *datap;

	ifr = compat_alloc_user_space(sizeof(*ifr));

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

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

	datap = compat_ptr(data);
	if (put_user(datap, &ifr->ifr_ifru.ifru_data))
		return -EFAULT;

2564
	return dev_ioctl(net, SIOCETHTOOL, ifr);
2565 2566
}

2567 2568 2569 2570 2571 2572
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
{
	void __user *uptr;
	compat_uptr_t uptr32;
	struct ifreq __user *uifr;

2573
	uifr = compat_alloc_user_space(sizeof(*uifr));
2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
		return -EFAULT;

	if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
		return -EFAULT;

	uptr = compat_ptr(uptr32);

	if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
		return -EFAULT;

	return dev_ioctl(net, SIOCWANDEV, uifr);
}

2588 2589
static int bond_ioctl(struct net *net, unsigned int cmd,
			 struct compat_ifreq __user *ifr32)
2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602
{
	struct ifreq kifr;
	struct ifreq __user *uifr;
	mm_segment_t old_fs;
	int err;
	u32 data;
	void __user *datap;

	switch (cmd) {
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDCHANGEACTIVE:
2603
		if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2604 2605 2606
			return -EFAULT;

		old_fs = get_fs();
2607
		set_fs(KERNEL_DS);
2608
		err = dev_ioctl(net, cmd, &kifr);
2609
		set_fs(old_fs);
2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624

		return err;
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
		uifr = compat_alloc_user_space(sizeof(*uifr));
		if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
			return -EFAULT;

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

		datap = compat_ptr(data);
		if (put_user(datap, &uifr->ifr_ifru.ifru_data))
			return -EFAULT;

2625
		return dev_ioctl(net, cmd, uifr);
2626 2627
	default:
		return -EINVAL;
2628
	}
2629 2630
}

2631 2632
static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
				 struct compat_ifreq __user *u_ifreq32)
2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656
{
	struct ifreq __user *u_ifreq64;
	char tmp_buf[IFNAMSIZ];
	void __user *data64;
	u32 data32;

	if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
			   IFNAMSIZ))
		return -EFAULT;
	if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
		return -EFAULT;
	data64 = compat_ptr(data32);

	u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));

	/* Don't check these user accesses, just let that get trapped
	 * in the ioctl handler instead.
	 */
	if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
			 IFNAMSIZ))
		return -EFAULT;
	if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
		return -EFAULT;

2657
	return dev_ioctl(net, cmd, u_ifreq64);
2658 2659
}

2660 2661
static int dev_ifsioc(struct net *net, struct socket *sock,
			 unsigned int cmd, struct compat_ifreq __user *uifr32)
2662
{
2663
	struct ifreq __user *uifr;
2664 2665
	int err;

2666 2667 2668 2669 2670 2671
	uifr = compat_alloc_user_space(sizeof(*uifr));
	if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
		return -EFAULT;

	err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);

2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683
	if (!err) {
		switch (cmd) {
		case SIOCGIFFLAGS:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFMEM:
		case SIOCGIFHWADDR:
		case SIOCGIFINDEX:
		case SIOCGIFADDR:
		case SIOCGIFBRDADDR:
		case SIOCGIFDSTADDR:
		case SIOCGIFNETMASK:
2684
		case SIOCGIFPFLAGS:
2685
		case SIOCGIFTXQLEN:
2686 2687
		case SIOCGMIIPHY:
		case SIOCGMIIREG:
2688
			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
2689 2690 2691 2692 2693 2694 2695
				err = -EFAULT;
			break;
		}
	}
	return err;
}

2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715
static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
			struct compat_ifreq __user *uifr32)
{
	struct ifreq ifr;
	struct compat_ifmap __user *uifmap32;
	mm_segment_t old_fs;
	int err;

	uifmap32 = &uifr32->ifr_ifru.ifru_map;
	err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
	err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
	err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
	err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
	err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
	err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
	err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
	if (err)
		return -EFAULT;

	old_fs = get_fs();
2716
	set_fs(KERNEL_DS);
2717
	err = dev_ioctl(net, cmd, (void __user *)&ifr);
2718
	set_fs(old_fs);
2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739

	if (cmd == SIOCGIFMAP && !err) {
		err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
		err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
		err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
		err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
		err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
		err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
		err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
		if (err)
			err = -EFAULT;
	}
	return err;
}

static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
{
	void __user *uptr;
	compat_uptr_t uptr32;
	struct ifreq __user *uifr;

2740
	uifr = compat_alloc_user_space(sizeof(*uifr));
2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754
	if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
		return -EFAULT;

	if (get_user(uptr32, &uifr32->ifr_data))
		return -EFAULT;

	uptr = compat_ptr(uptr32);

	if (put_user(uptr, &uifr->ifr_data))
		return -EFAULT;

	return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
}

2755
struct rtentry32 {
2756
	u32		rt_pad1;
2757 2758 2759
	struct sockaddr rt_dst;         /* target address               */
	struct sockaddr rt_gateway;     /* gateway addr (RTF_GATEWAY)   */
	struct sockaddr rt_genmask;     /* target network mask (IP)     */
2760 2761 2762 2763 2764 2765 2766
	unsigned short	rt_flags;
	short		rt_pad2;
	u32		rt_pad3;
	unsigned char	rt_tos;
	unsigned char	rt_class;
	short		rt_pad4;
	short		rt_metric;      /* +1 for binary compatibility! */
2767
	/* char * */ u32 rt_dev;        /* forcing the device at add    */
2768 2769
	u32		rt_mtu;         /* per route MTU/Window         */
	u32		rt_window;      /* Window clamping              */
2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785
	unsigned short  rt_irtt;        /* Initial RTT                  */
};

struct in6_rtmsg32 {
	struct in6_addr		rtmsg_dst;
	struct in6_addr		rtmsg_src;
	struct in6_addr		rtmsg_gateway;
	u32			rtmsg_type;
	u16			rtmsg_dst_len;
	u16			rtmsg_src_len;
	u32			rtmsg_metric;
	u32			rtmsg_info;
	u32			rtmsg_flags;
	s32			rtmsg_ifindex;
};

2786 2787
static int routing_ioctl(struct net *net, struct socket *sock,
			 unsigned int cmd, void __user *argp)
2788 2789 2790 2791 2792 2793 2794 2795 2796
{
	int ret;
	void *r = NULL;
	struct in6_rtmsg r6;
	struct rtentry r4;
	char devname[16];
	u32 rtdev;
	mm_segment_t old_fs = get_fs();

2797 2798
	if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
		struct in6_rtmsg32 __user *ur6 = argp;
2799
		ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
2800
			3 * sizeof(struct in6_addr));
2801 2802 2803 2804 2805 2806 2807
		ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
		ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
		ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
		ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
		ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
		ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
		ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
2808 2809 2810

		r = (void *) &r6;
	} else { /* ipv4 */
2811
		struct rtentry32 __user *ur4 = argp;
2812
		ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
2813
					3 * sizeof(struct sockaddr));
2814 2815 2816 2817 2818 2819
		ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
		ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
		ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
		ret |= __get_user(r4.rt_window, &(ur4->rt_window));
		ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
		ret |= __get_user(rtdev, &(ur4->rt_dev));
2820
		if (rtdev) {
2821
			ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
			r4.rt_dev = devname; devname[15] = 0;
		} else
			r4.rt_dev = NULL;

		r = (void *) &r4;
	}

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

2834
	set_fs(KERNEL_DS);
2835
	ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
2836
	set_fs(old_fs);
2837 2838 2839 2840 2841 2842 2843 2844 2845

out:
	return ret;
}

/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
 * for some operations; this forces use of the newer bridge-utils that
 * use compatiable ioctls
 */
2846
static int old_bridge_ioctl(compat_ulong_t __user *argp)
2847
{
2848
	compat_ulong_t tmp;
2849

2850
	if (get_user(tmp, argp))
2851 2852 2853 2854 2855 2856
		return -EFAULT;
	if (tmp == BRCTL_GET_VERSION)
		return BRCTL_VERSION + 1;
	return -EINVAL;
}

2857 2858 2859 2860 2861 2862
static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
			 unsigned int cmd, unsigned long arg)
{
	void __user *argp = compat_ptr(arg);
	struct sock *sk = sock->sk;
	struct net *net = sock_net(sk);
2863

2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876
	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
		return siocdevprivate_ioctl(net, cmd, argp);

	switch (cmd) {
	case SIOCSIFBR:
	case SIOCGIFBR:
		return old_bridge_ioctl(argp);
	case SIOCGIFNAME:
		return dev_ifname32(net, argp);
	case SIOCGIFCONF:
		return dev_ifconf(net, argp);
	case SIOCETHTOOL:
		return ethtool_ioctl(net, argp);
2877 2878
	case SIOCWANDEV:
		return compat_siocwandev(net, argp);
2879 2880 2881
	case SIOCGIFMAP:
	case SIOCSIFMAP:
		return compat_sioc_ifmap(net, cmd, argp);
2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
	case SIOCBONDCHANGEACTIVE:
		return bond_ioctl(net, cmd, argp);
	case SIOCADDRT:
	case SIOCDELRT:
		return routing_ioctl(net, sock, cmd, argp);
	case SIOCGSTAMP:
		return do_siocgstamp(net, sock, cmd, argp);
	case SIOCGSTAMPNS:
		return do_siocgstampns(net, sock, cmd, argp);
2896 2897
	case SIOCSHWTSTAMP:
		return compat_siocshwtstamp(net, argp);
2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939

	case FIOSETOWN:
	case SIOCSPGRP:
	case FIOGETOWN:
	case SIOCGPGRP:
	case SIOCBRADDBR:
	case SIOCBRDELBR:
	case SIOCGIFVLAN:
	case SIOCSIFVLAN:
	case SIOCADDDLCI:
	case SIOCDELDLCI:
		return sock_ioctl(file, cmd, arg);

	case SIOCGIFFLAGS:
	case SIOCSIFFLAGS:
	case SIOCGIFMETRIC:
	case SIOCSIFMETRIC:
	case SIOCGIFMTU:
	case SIOCSIFMTU:
	case SIOCGIFMEM:
	case SIOCSIFMEM:
	case SIOCGIFHWADDR:
	case SIOCSIFHWADDR:
	case SIOCADDMULTI:
	case SIOCDELMULTI:
	case SIOCGIFINDEX:
	case SIOCGIFADDR:
	case SIOCSIFADDR:
	case SIOCSIFHWBROADCAST:
	case SIOCDIFADDR:
	case SIOCGIFBRDADDR:
	case SIOCSIFBRDADDR:
	case SIOCGIFDSTADDR:
	case SIOCSIFDSTADDR:
	case SIOCGIFNETMASK:
	case SIOCSIFNETMASK:
	case SIOCSIFPFLAGS:
	case SIOCGIFPFLAGS:
	case SIOCGIFTXQLEN:
	case SIOCSIFTXQLEN:
	case SIOCBRADDIF:
	case SIOCBRDELIF:
2940 2941 2942 2943
	case SIOCSIFNAME:
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSMIIREG:
2944
		return dev_ifsioc(net, sock, cmd, argp);
2945

2946 2947 2948 2949
	case SIOCSARP:
	case SIOCGARP:
	case SIOCDARP:
	case SIOCATMARK:
2950 2951 2952 2953 2954 2955 2956 2957
		return sock_do_ioctl(net, sock, cmd, arg);
	}

	/* Prevent warning from compat_sys_ioctl, these always
	 * result in -EINVAL in the native case anyway. */
	switch (cmd) {
	case SIOCRTMSG:
	case SIOCGIFCOUNT:
2958 2959 2960
	case SIOCSRARP:
	case SIOCGRARP:
	case SIOCDRARP:
2961 2962 2963 2964
	case SIOCSIFLINK:
	case SIOCGIFSLAVE:
	case SIOCSIFSLAVE:
		return -EINVAL;
2965 2966 2967 2968
	}

	return -ENOIOCTLCMD;
}
2969

2970
static long compat_sock_ioctl(struct file *file, unsigned cmd,
2971
			      unsigned long arg)
2972 2973 2974
{
	struct socket *sock = file->private_data;
	int ret = -ENOIOCTLCMD;
2975 2976 2977 2978 2979
	struct sock *sk;
	struct net *net;

	sk = sock->sk;
	net = sock_net(sk);
2980 2981 2982 2983

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

2984 2985 2986 2987
	if (ret == -ENOIOCTLCMD &&
	    (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
		ret = compat_wext_handle_ioctl(net, cmd, arg);

2988 2989 2990
	if (ret == -ENOIOCTLCMD)
		ret = compat_sock_ioctl_trans(file, sock, cmd, arg);

2991 2992 2993 2994
	return ret;
}
#endif

2995 2996 2997 2998
int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
	return sock->ops->bind(sock, addr, addrlen);
}
2999
EXPORT_SYMBOL(kernel_bind);
3000 3001 3002 3003 3004

int kernel_listen(struct socket *sock, int backlog)
{
	return sock->ops->listen(sock, backlog);
}
3005
EXPORT_SYMBOL(kernel_listen);
3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019

int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
{
	struct sock *sk = sock->sk;
	int err;

	err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
			       newsock);
	if (err < 0)
		goto done;

	err = sock->ops->accept(sock, *newsock, flags);
	if (err < 0) {
		sock_release(*newsock);
3020
		*newsock = NULL;
3021 3022 3023 3024
		goto done;
	}

	(*newsock)->ops = sock->ops;
3025
	__module_get((*newsock)->ops->owner);
3026 3027 3028 3029

done:
	return err;
}
3030
EXPORT_SYMBOL(kernel_accept);
3031 3032

int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3033
		   int flags)
3034 3035 3036
{
	return sock->ops->connect(sock, addr, addrlen, flags);
}
3037
EXPORT_SYMBOL(kernel_connect);
3038 3039 3040 3041 3042 3043

int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 0);
}
3044
EXPORT_SYMBOL(kernel_getsockname);
3045 3046 3047 3048 3049 3050

int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
			 int *addrlen)
{
	return sock->ops->getname(sock, addr, addrlen, 1);
}
3051
EXPORT_SYMBOL(kernel_getpeername);
3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067

int kernel_getsockopt(struct socket *sock, int level, int optname,
			char *optval, int *optlen)
{
	mm_segment_t oldfs = get_fs();
	int err;

	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
		err = sock_getsockopt(sock, level, optname, optval, optlen);
	else
		err = sock->ops->getsockopt(sock, level, optname, optval,
					    optlen);
	set_fs(oldfs);
	return err;
}
3068
EXPORT_SYMBOL(kernel_getsockopt);
3069 3070

int kernel_setsockopt(struct socket *sock, int level, int optname,
3071
			char *optval, unsigned int optlen)
3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084
{
	mm_segment_t oldfs = get_fs();
	int err;

	set_fs(KERNEL_DS);
	if (level == SOL_SOCKET)
		err = sock_setsockopt(sock, level, optname, optval, optlen);
	else
		err = sock->ops->setsockopt(sock, level, optname, optval,
					    optlen);
	set_fs(oldfs);
	return err;
}
3085
EXPORT_SYMBOL(kernel_setsockopt);
3086 3087 3088 3089

int kernel_sendpage(struct socket *sock, struct page *page, int offset,
		    size_t size, int flags)
{
3090 3091
	sock_update_classid(sock->sk);

3092 3093 3094 3095 3096
	if (sock->ops->sendpage)
		return sock->ops->sendpage(sock, page, offset, size, flags);

	return sock_no_sendpage(sock, page, offset, size, flags);
}
3097
EXPORT_SYMBOL(kernel_sendpage);
3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109

int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
{
	mm_segment_t oldfs = get_fs();
	int err;

	set_fs(KERNEL_DS);
	err = sock->ops->ioctl(sock, cmd, arg);
	set_fs(oldfs);

	return err;
}
3110
EXPORT_SYMBOL(kernel_sock_ioctl);
3111

3112 3113 3114 3115 3116
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
{
	return sock->ops->shutdown(sock, how);
}
EXPORT_SYMBOL(kernel_sock_shutdown);