projects/linux·blob v2.6.21 · refs

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1/*
2 * NET An implementation of the SOCKET network access protocol.
3 *
4 * Version: @(#)socket.c 1.1.93 18/02/95
5 *
6 * Authors: Orest Zborowski, <[email protected]>
7 * Ross Biro
8 * Fred N. van Kempen, <[email protected]>
9 *
10 * Fixes:
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
12 * shutdown()
13 * Alan Cox : verify_area() fixes
14 * Alan Cox : Removed DDI
15 * Jonathan Kamens : SOCK_DGRAM reconnect bug
16 * Alan Cox : Moved a load of checks to the very
17 * top level.
18 * Alan Cox : Move address structures to/from user
19 * mode above the protocol layers.
20 * Rob Janssen : Allow 0 length sends.
21 * Alan Cox : Asynchronous I/O support (cribbed from the
22 * tty drivers).
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
25 * configurable.
26 * Matti Aarnio : Made the number of sockets dynamic,
27 * to be allocated when needed, and mr.
28 * Uphoff's max is used as max to be
29 * allowed to allocate.
30 * Linus : Argh. removed all the socket allocation
31 * altogether: it's in the inode now.
32 * Alan Cox : Made sock_alloc()/sock_release() public
33 * for NetROM and future kernel nfsd type
34 * stuff.
35 * Alan Cox : sendmsg/recvmsg basics.
36 * Tom Dyas : Export net symbols.
37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n".
38 * Alan Cox : Added thread locking to sys_* calls
39 * for sockets. May have errors at the
40 * moment.
41 * Kevin Buhr : Fixed the dumb errors in the above.
42 * Andi Kleen : Some small cleanups, optimizations,
43 * and fixed a copy_from_user() bug.
44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0)
45 * Tigran Aivazian : Made listen(2) backlog sanity checks
46 * protocol-independent
47 *
48 *
49 * This program is free software; you can redistribute it and/or
50 * modify it under the terms of the GNU General Public License
51 * as published by the Free Software Foundation; either version
52 * 2 of the License, or (at your option) any later version.
53 *
54 *
55 * This module is effectively the top level interface to the BSD socket
56 * paradigm.
57 *
58 * Based upon Swansea University Computer Society NET3.039
59 */
60
61#include <linux/mm.h>
62#include <linux/socket.h>
63#include <linux/file.h>
64#include <linux/net.h>
65#include <linux/interrupt.h>
66#include <linux/rcupdate.h>
67#include <linux/netdevice.h>
68#include <linux/proc_fs.h>
69#include <linux/seq_file.h>
70#include <linux/mutex.h>
71#include <linux/wanrouter.h>
72#include <linux/if_bridge.h>
73#include <linux/if_frad.h>
74#include <linux/if_vlan.h>
75#include <linux/init.h>
76#include <linux/poll.h>
77#include <linux/cache.h>
78#include <linux/module.h>
79#include <linux/highmem.h>
80#include <linux/mount.h>
81#include <linux/security.h>
82#include <linux/syscalls.h>
83#include <linux/compat.h>
84#include <linux/kmod.h>
85#include <linux/audit.h>
86#include <linux/wireless.h>
87
88#include <asm/uaccess.h>
89#include <asm/unistd.h>
90
91#include <net/compat.h>
92
93#include <net/sock.h>
94#include <linux/netfilter.h>
95
96static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
97static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
98 unsigned long nr_segs, loff_t pos);
99static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
100 unsigned long nr_segs, loff_t pos);
101static int sock_mmap(struct file *file, struct vm_area_struct *vma);
102
103static int sock_close(struct inode *inode, struct file *file);
104static unsigned int sock_poll(struct file *file,
105 struct poll_table_struct *wait);
106static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
107#ifdef CONFIG_COMPAT
108static long compat_sock_ioctl(struct file *file,
109 unsigned int cmd, unsigned long arg);
110#endif
111static int sock_fasync(int fd, struct file *filp, int on);
112static ssize_t sock_sendpage(struct file *file, struct page *page,
113 int offset, size_t size, loff_t *ppos, int more);
114
115/*
116 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
117 * in the operation structures but are done directly via the socketcall() multiplexor.
118 */
119
120static const struct file_operations socket_file_ops = {
121 .owner = THIS_MODULE,
122 .llseek = no_llseek,
123 .aio_read = sock_aio_read,
124 .aio_write = sock_aio_write,
125 .poll = sock_poll,
126 .unlocked_ioctl = sock_ioctl,
127#ifdef CONFIG_COMPAT
128 .compat_ioctl = compat_sock_ioctl,
129#endif
130 .mmap = sock_mmap,
131 .open = sock_no_open, /* special open code to disallow open via /proc */
132 .release = sock_close,
133 .fasync = sock_fasync,
134 .sendpage = sock_sendpage,
135 .splice_write = generic_splice_sendpage,
136};
137
138/*
139 * The protocol list. Each protocol is registered in here.
140 */
141
142static DEFINE_SPINLOCK(net_family_lock);
143static const struct net_proto_family *net_families[NPROTO] __read_mostly;
144
145/*
146 * Statistics counters of the socket lists
147 */
148
149static DEFINE_PER_CPU(int, sockets_in_use) = 0;
150
151/*
152 * Support routines.
153 * Move socket addresses back and forth across the kernel/user
154 * divide and look after the messy bits.
155 */
156
157#define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
158 16 for IP, 16 for IPX,
159 24 for IPv6,
160 about 80 for AX.25
161 must be at least one bigger than
162 the AF_UNIX size (see net/unix/af_unix.c
163 :unix_mkname()).
164 */
165
166/**
167 * move_addr_to_kernel - copy a socket address into kernel space
168 * @uaddr: Address in user space
169 * @kaddr: Address in kernel space
170 * @ulen: Length in user space
171 *
172 * The address is copied into kernel space. If the provided address is
173 * too long an error code of -EINVAL is returned. If the copy gives
174 * invalid addresses -EFAULT is returned. On a success 0 is returned.
175 */
176
177int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
178{
179 if (ulen < 0 || ulen > MAX_SOCK_ADDR)
180 return -EINVAL;
181 if (ulen == 0)
182 return 0;
183 if (copy_from_user(kaddr, uaddr, ulen))
184 return -EFAULT;
185 return audit_sockaddr(ulen, kaddr);
186}
187
188/**
189 * move_addr_to_user - copy an address to user space
190 * @kaddr: kernel space address
191 * @klen: length of address in kernel
192 * @uaddr: user space address
193 * @ulen: pointer to user length field
194 *
195 * The value pointed to by ulen on entry is the buffer length available.
196 * This is overwritten with the buffer space used. -EINVAL is returned
197 * if an overlong buffer is specified or a negative buffer size. -EFAULT
198 * is returned if either the buffer or the length field are not
199 * accessible.
200 * After copying the data up to the limit the user specifies, the true
201 * length of the data is written over the length limit the user
202 * specified. Zero is returned for a success.
203 */
204
205int move_addr_to_user(void *kaddr, int klen, void __user *uaddr,
206 int __user *ulen)
207{
208 int err;
209 int len;
210
211 err = get_user(len, ulen);
212 if (err)
213 return err;
214 if (len > klen)
215 len = klen;
216 if (len < 0 || len > MAX_SOCK_ADDR)
217 return -EINVAL;
218 if (len) {
219 if (audit_sockaddr(klen, kaddr))
220 return -ENOMEM;
221 if (copy_to_user(uaddr, kaddr, len))
222 return -EFAULT;
223 }
224 /*
225 * "fromlen shall refer to the value before truncation.."
226 * 1003.1g
227 */
228 return __put_user(klen, ulen);
229}
230
231#define SOCKFS_MAGIC 0x534F434B
232
233static struct kmem_cache *sock_inode_cachep __read_mostly;
234
235static struct inode *sock_alloc_inode(struct super_block *sb)
236{
237 struct socket_alloc *ei;
238
239 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
240 if (!ei)
241 return NULL;
242 init_waitqueue_head(&ei->socket.wait);
243
244 ei->socket.fasync_list = NULL;
245 ei->socket.state = SS_UNCONNECTED;
246 ei->socket.flags = 0;
247 ei->socket.ops = NULL;
248 ei->socket.sk = NULL;
249 ei->socket.file = NULL;
250
251 return &ei->vfs_inode;
252}
253
254static void sock_destroy_inode(struct inode *inode)
255{
256 kmem_cache_free(sock_inode_cachep,
257 container_of(inode, struct socket_alloc, vfs_inode));
258}
259
260static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags)
261{
262 struct socket_alloc *ei = (struct socket_alloc *)foo;
263
264 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR))
265 == SLAB_CTOR_CONSTRUCTOR)
266 inode_init_once(&ei->vfs_inode);
267}
268
269static int init_inodecache(void)
270{
271 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
272 sizeof(struct socket_alloc),
273 0,
274 (SLAB_HWCACHE_ALIGN |
275 SLAB_RECLAIM_ACCOUNT |
276 SLAB_MEM_SPREAD),
277 init_once,
278 NULL);
279 if (sock_inode_cachep == NULL)
280 return -ENOMEM;
281 return 0;
282}
283
284static struct super_operations sockfs_ops = {
285 .alloc_inode = sock_alloc_inode,
286 .destroy_inode =sock_destroy_inode,
287 .statfs = simple_statfs,
288};
289
290static int sockfs_get_sb(struct file_system_type *fs_type,
291 int flags, const char *dev_name, void *data,
292 struct vfsmount *mnt)
293{
294 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
295 mnt);
296}
297
298static struct vfsmount *sock_mnt __read_mostly;
299
300static struct file_system_type sock_fs_type = {
301 .name = "sockfs",
302 .get_sb = sockfs_get_sb,
303 .kill_sb = kill_anon_super,
304};
305
306static int sockfs_delete_dentry(struct dentry *dentry)
307{
308 /*
309 * At creation time, we pretended this dentry was hashed
310 * (by clearing DCACHE_UNHASHED bit in d_flags)
311 * At delete time, we restore the truth : not hashed.
312 * (so that dput() can proceed correctly)
313 */
314 dentry->d_flags |= DCACHE_UNHASHED;
315 return 0;
316}
317static struct dentry_operations sockfs_dentry_operations = {
318 .d_delete = sockfs_delete_dentry,
319};
320
321/*
322 * Obtains the first available file descriptor and sets it up for use.
323 *
324 * These functions create file structures and maps them to fd space
325 * of the current process. On success it returns file descriptor
326 * and file struct implicitly stored in sock->file.
327 * Note that another thread may close file descriptor before we return
328 * from this function. We use the fact that now we do not refer
329 * to socket after mapping. If one day we will need it, this
330 * function will increment ref. count on file by 1.
331 *
332 * In any case returned fd MAY BE not valid!
333 * This race condition is unavoidable
334 * with shared fd spaces, we cannot solve it inside kernel,
335 * but we take care of internal coherence yet.
336 */
337
338static int sock_alloc_fd(struct file **filep)
339{
340 int fd;
341
342 fd = get_unused_fd();
343 if (likely(fd >= 0)) {
344 struct file *file = get_empty_filp();
345
346 *filep = file;
347 if (unlikely(!file)) {
348 put_unused_fd(fd);
349 return -ENFILE;
350 }
351 } else
352 *filep = NULL;
353 return fd;
354}
355
356static int sock_attach_fd(struct socket *sock, struct file *file)
357{
358 struct qstr this;
359 char name[32];
360
361 this.len = sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino);
362 this.name = name;
363 this.hash = 0;
364
365 file->f_path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this);
366 if (unlikely(!file->f_path.dentry))
367 return -ENOMEM;
368
369 file->f_path.dentry->d_op = &sockfs_dentry_operations;
370 /*
371 * We dont want to push this dentry into global dentry hash table.
372 * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
373 * This permits a working /proc/$pid/fd/XXX on sockets
374 */
375 file->f_path.dentry->d_flags &= ~DCACHE_UNHASHED;
376 d_instantiate(file->f_path.dentry, SOCK_INODE(sock));
377 file->f_path.mnt = mntget(sock_mnt);
378 file->f_mapping = file->f_path.dentry->d_inode->i_mapping;
379
380 sock->file = file;
381 file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops;
382 file->f_mode = FMODE_READ | FMODE_WRITE;
383 file->f_flags = O_RDWR;
384 file->f_pos = 0;
385 file->private_data = sock;
386
387 return 0;
388}
389
390int sock_map_fd(struct socket *sock)
391{
392 struct file *newfile;
393 int fd = sock_alloc_fd(&newfile);
394
395 if (likely(fd >= 0)) {
396 int err = sock_attach_fd(sock, newfile);
397
398 if (unlikely(err < 0)) {
399 put_filp(newfile);
400 put_unused_fd(fd);
401 return err;
402 }
403 fd_install(fd, newfile);
404 }
405 return fd;
406}
407
408static struct socket *sock_from_file(struct file *file, int *err)
409{
410 if (file->f_op == &socket_file_ops)
411 return file->private_data; /* set in sock_map_fd */
412
413 *err = -ENOTSOCK;
414 return NULL;
415}
416
417/**
418 * sockfd_lookup - Go from a file number to its socket slot
419 * @fd: file handle
420 * @err: pointer to an error code return
421 *
422 * The file handle passed in is locked and the socket it is bound
423 * too is returned. If an error occurs the err pointer is overwritten
424 * with a negative errno code and NULL is returned. The function checks
425 * for both invalid handles and passing a handle which is not a socket.
426 *
427 * On a success the socket object pointer is returned.
428 */
429
430struct socket *sockfd_lookup(int fd, int *err)
431{
432 struct file *file;
433 struct socket *sock;
434
435 file = fget(fd);
436 if (!file) {
437 *err = -EBADF;
438 return NULL;
439 }
440
441 sock = sock_from_file(file, err);
442 if (!sock)
443 fput(file);
444 return sock;
445}
446
447static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
448{
449 struct file *file;
450 struct socket *sock;
451
452 *err = -EBADF;
453 file = fget_light(fd, fput_needed);
454 if (file) {
455 sock = sock_from_file(file, err);
456 if (sock)
457 return sock;
458 fput_light(file, *fput_needed);
459 }
460 return NULL;
461}
462
463/**
464 * sock_alloc - allocate a socket
465 *
466 * Allocate a new inode and socket object. The two are bound together
467 * and initialised. The socket is then returned. If we are out of inodes
468 * NULL is returned.
469 */
470
471static struct socket *sock_alloc(void)
472{
473 struct inode *inode;
474 struct socket *sock;
475
476 inode = new_inode(sock_mnt->mnt_sb);
477 if (!inode)
478 return NULL;
479
480 sock = SOCKET_I(inode);
481
482 inode->i_mode = S_IFSOCK | S_IRWXUGO;
483 inode->i_uid = current->fsuid;
484 inode->i_gid = current->fsgid;
485
486 get_cpu_var(sockets_in_use)++;
487 put_cpu_var(sockets_in_use);
488 return sock;
489}
490
491/*
492 * In theory you can't get an open on this inode, but /proc provides
493 * a back door. Remember to keep it shut otherwise you'll let the
494 * creepy crawlies in.
495 */
496
497static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
498{
499 return -ENXIO;
500}
501
502const struct file_operations bad_sock_fops = {
503 .owner = THIS_MODULE,
504 .open = sock_no_open,
505};
506
507/**
508 * sock_release - close a socket
509 * @sock: socket to close
510 *
511 * The socket is released from the protocol stack if it has a release
512 * callback, and the inode is then released if the socket is bound to
513 * an inode not a file.
514 */
515
516void sock_release(struct socket *sock)
517{
518 if (sock->ops) {
519 struct module *owner = sock->ops->owner;
520
521 sock->ops->release(sock);
522 sock->ops = NULL;
523 module_put(owner);
524 }
525
526 if (sock->fasync_list)
527 printk(KERN_ERR "sock_release: fasync list not empty!\n");
528
529 get_cpu_var(sockets_in_use)--;
530 put_cpu_var(sockets_in_use);
531 if (!sock->file) {
532 iput(SOCK_INODE(sock));
533 return;
534 }
535 sock->file = NULL;
536}
537
538static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
539 struct msghdr *msg, size_t size)
540{
541 struct sock_iocb *si = kiocb_to_siocb(iocb);
542 int err;
543
544 si->sock = sock;
545 si->scm = NULL;
546 si->msg = msg;
547 si->size = size;
548
549 err = security_socket_sendmsg(sock, msg, size);
550 if (err)
551 return err;
552
553 return sock->ops->sendmsg(iocb, sock, msg, size);
554}
555
556int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
557{
558 struct kiocb iocb;
559 struct sock_iocb siocb;
560 int ret;
561
562 init_sync_kiocb(&iocb, NULL);
563 iocb.private = &siocb;
564 ret = __sock_sendmsg(&iocb, sock, msg, size);
565 if (-EIOCBQUEUED == ret)
566 ret = wait_on_sync_kiocb(&iocb);
567 return ret;
568}
569
570int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
571 struct kvec *vec, size_t num, size_t size)
572{
573 mm_segment_t oldfs = get_fs();
574 int result;
575
576 set_fs(KERNEL_DS);
577 /*
578 * the following is safe, since for compiler definitions of kvec and
579 * iovec are identical, yielding the same in-core layout and alignment
580 */
581 msg->msg_iov = (struct iovec *)vec;
582 msg->msg_iovlen = num;
583 result = sock_sendmsg(sock, msg, size);
584 set_fs(oldfs);
585 return result;
586}
587
588static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
589 struct msghdr *msg, size_t size, int flags)
590{
591 int err;
592 struct sock_iocb *si = kiocb_to_siocb(iocb);
593
594 si->sock = sock;
595 si->scm = NULL;
596 si->msg = msg;
597 si->size = size;
598 si->flags = flags;
599
600 err = security_socket_recvmsg(sock, msg, size, flags);
601 if (err)
602 return err;
603
604 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
605}
606
607int sock_recvmsg(struct socket *sock, struct msghdr *msg,
608 size_t size, int flags)
609{
610 struct kiocb iocb;
611 struct sock_iocb siocb;
612 int ret;
613
614 init_sync_kiocb(&iocb, NULL);
615 iocb.private = &siocb;
616 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
617 if (-EIOCBQUEUED == ret)
618 ret = wait_on_sync_kiocb(&iocb);
619 return ret;
620}
621
622int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
623 struct kvec *vec, size_t num, size_t size, int flags)
624{
625 mm_segment_t oldfs = get_fs();
626 int result;
627
628 set_fs(KERNEL_DS);
629 /*
630 * the following is safe, since for compiler definitions of kvec and
631 * iovec are identical, yielding the same in-core layout and alignment
632 */
633 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
634 result = sock_recvmsg(sock, msg, size, flags);
635 set_fs(oldfs);
636 return result;
637}
638
639static void sock_aio_dtor(struct kiocb *iocb)
640{
641 kfree(iocb->private);
642}
643
644static ssize_t sock_sendpage(struct file *file, struct page *page,
645 int offset, size_t size, loff_t *ppos, int more)
646{
647 struct socket *sock;
648 int flags;
649
650 sock = file->private_data;
651
652 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
653 if (more)
654 flags |= MSG_MORE;
655
656 return sock->ops->sendpage(sock, page, offset, size, flags);
657}
658
659static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
660 struct sock_iocb *siocb)
661{
662 if (!is_sync_kiocb(iocb)) {
663 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
664 if (!siocb)
665 return NULL;
666 iocb->ki_dtor = sock_aio_dtor;
667 }
668
669 siocb->kiocb = iocb;
670 iocb->private = siocb;
671 return siocb;
672}
673
674static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
675 struct file *file, const struct iovec *iov,
676 unsigned long nr_segs)
677{
678 struct socket *sock = file->private_data;
679 size_t size = 0;
680 int i;
681
682 for (i = 0; i < nr_segs; i++)
683 size += iov[i].iov_len;
684
685 msg->msg_name = NULL;
686 msg->msg_namelen = 0;
687 msg->msg_control = NULL;
688 msg->msg_controllen = 0;
689 msg->msg_iov = (struct iovec *)iov;
690 msg->msg_iovlen = nr_segs;
691 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
692
693 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
694}
695
696static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
697 unsigned long nr_segs, loff_t pos)
698{
699 struct sock_iocb siocb, *x;
700
701 if (pos != 0)
702 return -ESPIPE;
703
704 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
705 return 0;
706
707
708 x = alloc_sock_iocb(iocb, &siocb);
709 if (!x)
710 return -ENOMEM;
711 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
712}
713
714static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
715 struct file *file, const struct iovec *iov,
716 unsigned long nr_segs)
717{
718 struct socket *sock = file->private_data;
719 size_t size = 0;
720 int i;
721
722 for (i = 0; i < nr_segs; i++)
723 size += iov[i].iov_len;
724
725 msg->msg_name = NULL;
726 msg->msg_namelen = 0;
727 msg->msg_control = NULL;
728 msg->msg_controllen = 0;
729 msg->msg_iov = (struct iovec *)iov;
730 msg->msg_iovlen = nr_segs;
731 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
732 if (sock->type == SOCK_SEQPACKET)
733 msg->msg_flags |= MSG_EOR;
734
735 return __sock_sendmsg(iocb, sock, msg, size);
736}
737
738static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
739 unsigned long nr_segs, loff_t pos)
740{
741 struct sock_iocb siocb, *x;
742
743 if (pos != 0)
744 return -ESPIPE;
745
746 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
747 return 0;
748
749 x = alloc_sock_iocb(iocb, &siocb);
750 if (!x)
751 return -ENOMEM;
752
753 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
754}
755
756/*
757 * Atomic setting of ioctl hooks to avoid race
758 * with module unload.
759 */
760
761static DEFINE_MUTEX(br_ioctl_mutex);
762static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL;
763
764void brioctl_set(int (*hook) (unsigned int, void __user *))
765{
766 mutex_lock(&br_ioctl_mutex);
767 br_ioctl_hook = hook;
768 mutex_unlock(&br_ioctl_mutex);
769}
770
771EXPORT_SYMBOL(brioctl_set);
772
773static DEFINE_MUTEX(vlan_ioctl_mutex);
774static int (*vlan_ioctl_hook) (void __user *arg);
775
776void vlan_ioctl_set(int (*hook) (void __user *))
777{
778 mutex_lock(&vlan_ioctl_mutex);
779 vlan_ioctl_hook = hook;
780 mutex_unlock(&vlan_ioctl_mutex);
781}
782
783EXPORT_SYMBOL(vlan_ioctl_set);
784
785static DEFINE_MUTEX(dlci_ioctl_mutex);
786static int (*dlci_ioctl_hook) (unsigned int, void __user *);
787
788void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
789{
790 mutex_lock(&dlci_ioctl_mutex);
791 dlci_ioctl_hook = hook;
792 mutex_unlock(&dlci_ioctl_mutex);
793}
794
795EXPORT_SYMBOL(dlci_ioctl_set);
796
797/*
798 * With an ioctl, arg may well be a user mode pointer, but we don't know
799 * what to do with it - that's up to the protocol still.
800 */
801
802static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
803{
804 struct socket *sock;
805 void __user *argp = (void __user *)arg;
806 int pid, err;
807
808 sock = file->private_data;
809 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
810 err = dev_ioctl(cmd, argp);
811 } else
812#ifdef CONFIG_WIRELESS_EXT
813 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
814 err = dev_ioctl(cmd, argp);
815 } else
816#endif /* CONFIG_WIRELESS_EXT */
817 switch (cmd) {
818 case FIOSETOWN:
819 case SIOCSPGRP:
820 err = -EFAULT;
821 if (get_user(pid, (int __user *)argp))
822 break;
823 err = f_setown(sock->file, pid, 1);
824 break;
825 case FIOGETOWN:
826 case SIOCGPGRP:
827 err = put_user(f_getown(sock->file),
828 (int __user *)argp);
829 break;
830 case SIOCGIFBR:
831 case SIOCSIFBR:
832 case SIOCBRADDBR:
833 case SIOCBRDELBR:
834 err = -ENOPKG;
835 if (!br_ioctl_hook)
836 request_module("bridge");
837
838 mutex_lock(&br_ioctl_mutex);
839 if (br_ioctl_hook)
840 err = br_ioctl_hook(cmd, argp);
841 mutex_unlock(&br_ioctl_mutex);
842 break;
843 case SIOCGIFVLAN:
844 case SIOCSIFVLAN:
845 err = -ENOPKG;
846 if (!vlan_ioctl_hook)
847 request_module("8021q");
848
849 mutex_lock(&vlan_ioctl_mutex);
850 if (vlan_ioctl_hook)
851 err = vlan_ioctl_hook(argp);
852 mutex_unlock(&vlan_ioctl_mutex);
853 break;
854 case SIOCADDDLCI:
855 case SIOCDELDLCI:
856 err = -ENOPKG;
857 if (!dlci_ioctl_hook)
858 request_module("dlci");
859
860 if (dlci_ioctl_hook) {
861 mutex_lock(&dlci_ioctl_mutex);
862 err = dlci_ioctl_hook(cmd, argp);
863 mutex_unlock(&dlci_ioctl_mutex);
864 }
865 break;
866 default:
867 err = sock->ops->ioctl(sock, cmd, arg);
868
869 /*
870 * If this ioctl is unknown try to hand it down
871 * to the NIC driver.
872 */
873 if (err == -ENOIOCTLCMD)
874 err = dev_ioctl(cmd, argp);
875 break;
876 }
877 return err;
878}
879
880int sock_create_lite(int family, int type, int protocol, struct socket **res)
881{
882 int err;
883 struct socket *sock = NULL;
884
885 err = security_socket_create(family, type, protocol, 1);
886 if (err)
887 goto out;
888
889 sock = sock_alloc();
890 if (!sock) {
891 err = -ENOMEM;
892 goto out;
893 }
894
895 sock->type = type;
896 err = security_socket_post_create(sock, family, type, protocol, 1);
897 if (err)
898 goto out_release;
899
900out:
901 *res = sock;
902 return err;
903out_release:
904 sock_release(sock);
905 sock = NULL;
906 goto out;
907}
908
909/* No kernel lock held - perfect */
910static unsigned int sock_poll(struct file *file, poll_table *wait)
911{
912 struct socket *sock;
913
914 /*
915 * We can't return errors to poll, so it's either yes or no.
916 */
917 sock = file->private_data;
918 return sock->ops->poll(file, sock, wait);
919}
920
921static int sock_mmap(struct file *file, struct vm_area_struct *vma)
922{
923 struct socket *sock = file->private_data;
924
925 return sock->ops->mmap(file, sock, vma);
926}
927
928static int sock_close(struct inode *inode, struct file *filp)
929{
930 /*
931 * It was possible the inode is NULL we were
932 * closing an unfinished socket.
933 */
934
935 if (!inode) {
936 printk(KERN_DEBUG "sock_close: NULL inode\n");
937 return 0;
938 }
939 sock_fasync(-1, filp, 0);
940 sock_release(SOCKET_I(inode));
941 return 0;
942}
943
944/*
945 * Update the socket async list
946 *
947 * Fasync_list locking strategy.
948 *
949 * 1. fasync_list is modified only under process context socket lock
950 * i.e. under semaphore.
951 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
952 * or under socket lock.
953 * 3. fasync_list can be used from softirq context, so that
954 * modification under socket lock have to be enhanced with
955 * write_lock_bh(&sk->sk_callback_lock).
956 * --ANK (990710)
957 */
958
959static int sock_fasync(int fd, struct file *filp, int on)
960{
961 struct fasync_struct *fa, *fna = NULL, **prev;
962 struct socket *sock;
963 struct sock *sk;
964
965 if (on) {
966 fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
967 if (fna == NULL)
968 return -ENOMEM;
969 }
970
971 sock = filp->private_data;
972
973 sk = sock->sk;
974 if (sk == NULL) {
975 kfree(fna);
976 return -EINVAL;
977 }
978
979 lock_sock(sk);
980
981 prev = &(sock->fasync_list);
982
983 for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev)
984 if (fa->fa_file == filp)
985 break;
986
987 if (on) {
988 if (fa != NULL) {
989 write_lock_bh(&sk->sk_callback_lock);
990 fa->fa_fd = fd;
991 write_unlock_bh(&sk->sk_callback_lock);
992
993 kfree(fna);
994 goto out;
995 }
996 fna->fa_file = filp;
997 fna->fa_fd = fd;
998 fna->magic = FASYNC_MAGIC;
999 fna->fa_next = sock->fasync_list;
1000 write_lock_bh(&sk->sk_callback_lock);
1001 sock->fasync_list = fna;
1002 write_unlock_bh(&sk->sk_callback_lock);
1003 } else {
1004 if (fa != NULL) {
1005 write_lock_bh(&sk->sk_callback_lock);
1006 *prev = fa->fa_next;
1007 write_unlock_bh(&sk->sk_callback_lock);
1008 kfree(fa);
1009 }
1010 }
1011
1012out:
1013 release_sock(sock->sk);
1014 return 0;
1015}
1016
1017/* This function may be called only under socket lock or callback_lock */
1018
1019int sock_wake_async(struct socket *sock, int how, int band)
1020{
1021 if (!sock || !sock->fasync_list)
1022 return -1;
1023 switch (how) {
1024 case 1:
1025
1026 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1027 break;
1028 goto call_kill;
1029 case 2:
1030 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1031 break;
1032 /* fall through */
1033 case 0:
1034call_kill:
1035 __kill_fasync(sock->fasync_list, SIGIO, band);
1036 break;
1037 case 3:
1038 __kill_fasync(sock->fasync_list, SIGURG, band);
1039 }
1040 return 0;
1041}
1042
1043static int __sock_create(int family, int type, int protocol,
1044 struct socket **res, int kern)
1045{
1046 int err;
1047 struct socket *sock;
1048 const struct net_proto_family *pf;
1049
1050 /*
1051 * Check protocol is in range
1052 */
1053 if (family < 0 || family >= NPROTO)
1054 return -EAFNOSUPPORT;
1055 if (type < 0 || type >= SOCK_MAX)
1056 return -EINVAL;
1057
1058 /* Compatibility.
1059
1060 This uglymoron is moved from INET layer to here to avoid
1061 deadlock in module load.
1062 */
1063 if (family == PF_INET && type == SOCK_PACKET) {
1064 static int warned;
1065 if (!warned) {
1066 warned = 1;
1067 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1068 current->comm);
1069 }
1070 family = PF_PACKET;
1071 }
1072
1073 err = security_socket_create(family, type, protocol, kern);
1074 if (err)
1075 return err;
1076
1077 /*
1078 * Allocate the socket and allow the family to set things up. if
1079 * the protocol is 0, the family is instructed to select an appropriate
1080 * default.
1081 */
1082 sock = sock_alloc();
1083 if (!sock) {
1084 if (net_ratelimit())
1085 printk(KERN_WARNING "socket: no more sockets\n");
1086 return -ENFILE; /* Not exactly a match, but its the
1087 closest posix thing */
1088 }
1089
1090 sock->type = type;
1091
1092#if defined(CONFIG_KMOD)
1093 /* Attempt to load a protocol module if the find failed.
1094 *
1095 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1096 * requested real, full-featured networking support upon configuration.
1097 * Otherwise module support will break!
1098 */
1099 if (net_families[family] == NULL)
1100 request_module("net-pf-%d", family);
1101#endif
1102
1103 rcu_read_lock();
1104 pf = rcu_dereference(net_families[family]);
1105 err = -EAFNOSUPPORT;
1106 if (!pf)
1107 goto out_release;
1108
1109 /*
1110 * We will call the ->create function, that possibly is in a loadable
1111 * module, so we have to bump that loadable module refcnt first.
1112 */
1113 if (!try_module_get(pf->owner))
1114 goto out_release;
1115
1116 /* Now protected by module ref count */
1117 rcu_read_unlock();
1118
1119 err = pf->create(sock, protocol);
1120 if (err < 0)
1121 goto out_module_put;
1122
1123 /*
1124 * Now to bump the refcnt of the [loadable] module that owns this
1125 * socket at sock_release time we decrement its refcnt.
1126 */
1127 if (!try_module_get(sock->ops->owner))
1128 goto out_module_busy;
1129
1130 /*
1131 * Now that we're done with the ->create function, the [loadable]
1132 * module can have its refcnt decremented
1133 */
1134 module_put(pf->owner);
1135 err = security_socket_post_create(sock, family, type, protocol, kern);
1136 if (err)
1137 goto out_release;
1138 *res = sock;
1139
1140 return 0;
1141
1142out_module_busy:
1143 err = -EAFNOSUPPORT;
1144out_module_put:
1145 sock->ops = NULL;
1146 module_put(pf->owner);
1147out_sock_release:
1148 sock_release(sock);
1149 return err;
1150
1151out_release:
1152 rcu_read_unlock();
1153 goto out_sock_release;
1154}
1155
1156int sock_create(int family, int type, int protocol, struct socket **res)
1157{
1158 return __sock_create(family, type, protocol, res, 0);
1159}
1160
1161int sock_create_kern(int family, int type, int protocol, struct socket **res)
1162{
1163 return __sock_create(family, type, protocol, res, 1);
1164}
1165
1166asmlinkage long sys_socket(int family, int type, int protocol)
1167{
1168 int retval;
1169 struct socket *sock;
1170
1171 retval = sock_create(family, type, protocol, &sock);
1172 if (retval < 0)
1173 goto out;
1174
1175 retval = sock_map_fd(sock);
1176 if (retval < 0)
1177 goto out_release;
1178
1179out:
1180 /* It may be already another descriptor 8) Not kernel problem. */
1181 return retval;
1182
1183out_release:
1184 sock_release(sock);
1185 return retval;
1186}
1187
1188/*
1189 * Create a pair of connected sockets.
1190 */
1191
1192asmlinkage long sys_socketpair(int family, int type, int protocol,
1193 int __user *usockvec)
1194{
1195 struct socket *sock1, *sock2;
1196 int fd1, fd2, err;
1197 struct file *newfile1, *newfile2;
1198
1199 /*
1200 * Obtain the first socket and check if the underlying protocol
1201 * supports the socketpair call.
1202 */
1203
1204 err = sock_create(family, type, protocol, &sock1);
1205 if (err < 0)
1206 goto out;
1207
1208 err = sock_create(family, type, protocol, &sock2);
1209 if (err < 0)
1210 goto out_release_1;
1211
1212 err = sock1->ops->socketpair(sock1, sock2);
1213 if (err < 0)
1214 goto out_release_both;
1215
1216 fd1 = sock_alloc_fd(&newfile1);
1217 if (unlikely(fd1 < 0))
1218 goto out_release_both;
1219
1220 fd2 = sock_alloc_fd(&newfile2);
1221 if (unlikely(fd2 < 0)) {
1222 put_filp(newfile1);
1223 put_unused_fd(fd1);
1224 goto out_release_both;
1225 }
1226
1227 err = sock_attach_fd(sock1, newfile1);
1228 if (unlikely(err < 0)) {
1229 goto out_fd2;
1230 }
1231
1232 err = sock_attach_fd(sock2, newfile2);
1233 if (unlikely(err < 0)) {
1234 fput(newfile1);
1235 goto out_fd1;
1236 }
1237
1238 err = audit_fd_pair(fd1, fd2);
1239 if (err < 0) {
1240 fput(newfile1);
1241 fput(newfile2);
1242 goto out_fd;
1243 }
1244
1245 fd_install(fd1, newfile1);
1246 fd_install(fd2, newfile2);
1247 /* fd1 and fd2 may be already another descriptors.
1248 * Not kernel problem.
1249 */
1250
1251 err = put_user(fd1, &usockvec[0]);
1252 if (!err)
1253 err = put_user(fd2, &usockvec[1]);
1254 if (!err)
1255 return 0;
1256
1257 sys_close(fd2);
1258 sys_close(fd1);
1259 return err;
1260
1261out_release_both:
1262 sock_release(sock2);
1263out_release_1:
1264 sock_release(sock1);
1265out:
1266 return err;
1267
1268out_fd2:
1269 put_filp(newfile1);
1270 sock_release(sock1);
1271out_fd1:
1272 put_filp(newfile2);
1273 sock_release(sock2);
1274out_fd:
1275 put_unused_fd(fd1);
1276 put_unused_fd(fd2);
1277 goto out;
1278}
1279
1280/*
1281 * Bind a name to a socket. Nothing much to do here since it's
1282 * the protocol's responsibility to handle the local address.
1283 *
1284 * We move the socket address to kernel space before we call
1285 * the protocol layer (having also checked the address is ok).
1286 */
1287
1288asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1289{
1290 struct socket *sock;
1291 char address[MAX_SOCK_ADDR];
1292 int err, fput_needed;
1293
1294 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1295 if(sock) {
1296 err = move_addr_to_kernel(umyaddr, addrlen, address);
1297 if (err >= 0) {
1298 err = security_socket_bind(sock,
1299 (struct sockaddr *)address,
1300 addrlen);
1301 if (!err)
1302 err = sock->ops->bind(sock,
1303 (struct sockaddr *)
1304 address, addrlen);
1305 }
1306 fput_light(sock->file, fput_needed);
1307 }
1308 return err;
1309}
1310
1311/*
1312 * Perform a listen. Basically, we allow the protocol to do anything
1313 * necessary for a listen, and if that works, we mark the socket as
1314 * ready for listening.
1315 */
1316
1317int sysctl_somaxconn __read_mostly = SOMAXCONN;
1318
1319asmlinkage long sys_listen(int fd, int backlog)
1320{
1321 struct socket *sock;
1322 int err, fput_needed;
1323
1324 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1325 if (sock) {
1326 if ((unsigned)backlog > sysctl_somaxconn)
1327 backlog = sysctl_somaxconn;
1328
1329 err = security_socket_listen(sock, backlog);
1330 if (!err)
1331 err = sock->ops->listen(sock, backlog);
1332
1333 fput_light(sock->file, fput_needed);
1334 }
1335 return err;
1336}
1337
1338/*
1339 * For accept, we attempt to create a new socket, set up the link
1340 * with the client, wake up the client, then return the new
1341 * connected fd. We collect the address of the connector in kernel
1342 * space and move it to user at the very end. This is unclean because
1343 * we open the socket then return an error.
1344 *
1345 * 1003.1g adds the ability to recvmsg() to query connection pending
1346 * status to recvmsg. We need to add that support in a way thats
1347 * clean when we restucture accept also.
1348 */
1349
1350asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
1351 int __user *upeer_addrlen)
1352{
1353 struct socket *sock, *newsock;
1354 struct file *newfile;
1355 int err, len, newfd, fput_needed;
1356 char address[MAX_SOCK_ADDR];
1357
1358 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1359 if (!sock)
1360 goto out;
1361
1362 err = -ENFILE;
1363 if (!(newsock = sock_alloc()))
1364 goto out_put;
1365
1366 newsock->type = sock->type;
1367 newsock->ops = sock->ops;
1368
1369 /*
1370 * We don't need try_module_get here, as the listening socket (sock)
1371 * has the protocol module (sock->ops->owner) held.
1372 */
1373 __module_get(newsock->ops->owner);
1374
1375 newfd = sock_alloc_fd(&newfile);
1376 if (unlikely(newfd < 0)) {
1377 err = newfd;
1378 sock_release(newsock);
1379 goto out_put;
1380 }
1381
1382 err = sock_attach_fd(newsock, newfile);
1383 if (err < 0)
1384 goto out_fd_simple;
1385
1386 err = security_socket_accept(sock, newsock);
1387 if (err)
1388 goto out_fd;
1389
1390 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1391 if (err < 0)
1392 goto out_fd;
1393
1394 if (upeer_sockaddr) {
1395 if (newsock->ops->getname(newsock, (struct sockaddr *)address,
1396 &len, 2) < 0) {
1397 err = -ECONNABORTED;
1398 goto out_fd;
1399 }
1400 err = move_addr_to_user(address, len, upeer_sockaddr,
1401 upeer_addrlen);
1402 if (err < 0)
1403 goto out_fd;
1404 }
1405
1406 /* File flags are not inherited via accept() unlike another OSes. */
1407
1408 fd_install(newfd, newfile);
1409 err = newfd;
1410
1411 security_socket_post_accept(sock, newsock);
1412
1413out_put:
1414 fput_light(sock->file, fput_needed);
1415out:
1416 return err;
1417out_fd_simple:
1418 sock_release(newsock);
1419 put_filp(newfile);
1420 put_unused_fd(newfd);
1421 goto out_put;
1422out_fd:
1423 fput(newfile);
1424 put_unused_fd(newfd);
1425 goto out_put;
1426}
1427
1428/*
1429 * Attempt to connect to a socket with the server address. The address
1430 * is in user space so we verify it is OK and move it to kernel space.
1431 *
1432 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1433 * break bindings
1434 *
1435 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1436 * other SEQPACKET protocols that take time to connect() as it doesn't
1437 * include the -EINPROGRESS status for such sockets.
1438 */
1439
1440asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr,
1441 int addrlen)
1442{
1443 struct socket *sock;
1444 char address[MAX_SOCK_ADDR];
1445 int err, fput_needed;
1446
1447 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1448 if (!sock)
1449 goto out;
1450 err = move_addr_to_kernel(uservaddr, addrlen, address);
1451 if (err < 0)
1452 goto out_put;
1453
1454 err =
1455 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
1456 if (err)
1457 goto out_put;
1458
1459 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
1460 sock->file->f_flags);
1461out_put:
1462 fput_light(sock->file, fput_needed);
1463out:
1464 return err;
1465}
1466
1467/*
1468 * Get the local address ('name') of a socket object. Move the obtained
1469 * name to user space.
1470 */
1471
1472asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1473 int __user *usockaddr_len)
1474{
1475 struct socket *sock;
1476 char address[MAX_SOCK_ADDR];
1477 int len, err, fput_needed;
1478
1479 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1480 if (!sock)
1481 goto out;
1482
1483 err = security_socket_getsockname(sock);
1484 if (err)
1485 goto out_put;
1486
1487 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
1488 if (err)
1489 goto out_put;
1490 err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
1491
1492out_put:
1493 fput_light(sock->file, fput_needed);
1494out:
1495 return err;
1496}
1497
1498/*
1499 * Get the remote address ('name') of a socket object. Move the obtained
1500 * name to user space.
1501 */
1502
1503asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1504 int __user *usockaddr_len)
1505{
1506 struct socket *sock;
1507 char address[MAX_SOCK_ADDR];
1508 int len, err, fput_needed;
1509
1510 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1511 if (sock != NULL) {
1512 err = security_socket_getpeername(sock);
1513 if (err) {
1514 fput_light(sock->file, fput_needed);
1515 return err;
1516 }
1517
1518 err =
1519 sock->ops->getname(sock, (struct sockaddr *)address, &len,
1520 1);
1521 if (!err)
1522 err = move_addr_to_user(address, len, usockaddr,
1523 usockaddr_len);
1524 fput_light(sock->file, fput_needed);
1525 }
1526 return err;
1527}
1528
1529/*
1530 * Send a datagram to a given address. We move the address into kernel
1531 * space and check the user space data area is readable before invoking
1532 * the protocol.
1533 */
1534
1535asmlinkage long sys_sendto(int fd, void __user *buff, size_t len,
1536 unsigned flags, struct sockaddr __user *addr,
1537 int addr_len)
1538{
1539 struct socket *sock;
1540 char address[MAX_SOCK_ADDR];
1541 int err;
1542 struct msghdr msg;
1543 struct iovec iov;
1544 int fput_needed;
1545 struct file *sock_file;
1546
1547 sock_file = fget_light(fd, &fput_needed);
1548 err = -EBADF;
1549 if (!sock_file)
1550 goto out;
1551
1552 sock = sock_from_file(sock_file, &err);
1553 if (!sock)
1554 goto out_put;
1555 iov.iov_base = buff;
1556 iov.iov_len = len;
1557 msg.msg_name = NULL;
1558 msg.msg_iov = &iov;
1559 msg.msg_iovlen = 1;
1560 msg.msg_control = NULL;
1561 msg.msg_controllen = 0;
1562 msg.msg_namelen = 0;
1563 if (addr) {
1564 err = move_addr_to_kernel(addr, addr_len, address);
1565 if (err < 0)
1566 goto out_put;
1567 msg.msg_name = address;
1568 msg.msg_namelen = addr_len;
1569 }
1570 if (sock->file->f_flags & O_NONBLOCK)
1571 flags |= MSG_DONTWAIT;
1572 msg.msg_flags = flags;
1573 err = sock_sendmsg(sock, &msg, len);
1574
1575out_put:
1576 fput_light(sock_file, fput_needed);
1577out:
1578 return err;
1579}
1580
1581/*
1582 * Send a datagram down a socket.
1583 */
1584
1585asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags)
1586{
1587 return sys_sendto(fd, buff, len, flags, NULL, 0);
1588}
1589
1590/*
1591 * Receive a frame from the socket and optionally record the address of the
1592 * sender. We verify the buffers are writable and if needed move the
1593 * sender address from kernel to user space.
1594 */
1595
1596asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size,
1597 unsigned flags, struct sockaddr __user *addr,
1598 int __user *addr_len)
1599{
1600 struct socket *sock;
1601 struct iovec iov;
1602 struct msghdr msg;
1603 char address[MAX_SOCK_ADDR];
1604 int err, err2;
1605 struct file *sock_file;
1606 int fput_needed;
1607
1608 sock_file = fget_light(fd, &fput_needed);
1609 err = -EBADF;
1610 if (!sock_file)
1611 goto out;
1612
1613 sock = sock_from_file(sock_file, &err);
1614 if (!sock)
1615 goto out_put;
1616
1617 msg.msg_control = NULL;
1618 msg.msg_controllen = 0;
1619 msg.msg_iovlen = 1;
1620 msg.msg_iov = &iov;
1621 iov.iov_len = size;
1622 iov.iov_base = ubuf;
1623 msg.msg_name = address;
1624 msg.msg_namelen = MAX_SOCK_ADDR;
1625 if (sock->file->f_flags & O_NONBLOCK)
1626 flags |= MSG_DONTWAIT;
1627 err = sock_recvmsg(sock, &msg, size, flags);
1628
1629 if (err >= 0 && addr != NULL) {
1630 err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
1631 if (err2 < 0)
1632 err = err2;
1633 }
1634out_put:
1635 fput_light(sock_file, fput_needed);
1636out:
1637 return err;
1638}
1639
1640/*
1641 * Receive a datagram from a socket.
1642 */
1643
1644asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1645 unsigned flags)
1646{
1647 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1648}
1649
1650/*
1651 * Set a socket option. Because we don't know the option lengths we have
1652 * to pass the user mode parameter for the protocols to sort out.
1653 */
1654
1655asmlinkage long sys_setsockopt(int fd, int level, int optname,
1656 char __user *optval, int optlen)
1657{
1658 int err, fput_needed;
1659 struct socket *sock;
1660
1661 if (optlen < 0)
1662 return -EINVAL;
1663
1664 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1665 if (sock != NULL) {
1666 err = security_socket_setsockopt(sock, level, optname);
1667 if (err)
1668 goto out_put;
1669
1670 if (level == SOL_SOCKET)
1671 err =
1672 sock_setsockopt(sock, level, optname, optval,
1673 optlen);
1674 else
1675 err =
1676 sock->ops->setsockopt(sock, level, optname, optval,
1677 optlen);
1678out_put:
1679 fput_light(sock->file, fput_needed);
1680 }
1681 return err;
1682}
1683
1684/*
1685 * Get a socket option. Because we don't know the option lengths we have
1686 * to pass a user mode parameter for the protocols to sort out.
1687 */
1688
1689asmlinkage long sys_getsockopt(int fd, int level, int optname,
1690 char __user *optval, int __user *optlen)
1691{
1692 int err, fput_needed;
1693 struct socket *sock;
1694
1695 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1696 if (sock != NULL) {
1697 err = security_socket_getsockopt(sock, level, optname);
1698 if (err)
1699 goto out_put;
1700
1701 if (level == SOL_SOCKET)
1702 err =
1703 sock_getsockopt(sock, level, optname, optval,
1704 optlen);
1705 else
1706 err =
1707 sock->ops->getsockopt(sock, level, optname, optval,
1708 optlen);
1709out_put:
1710 fput_light(sock->file, fput_needed);
1711 }
1712 return err;
1713}
1714
1715/*
1716 * Shutdown a socket.
1717 */
1718
1719asmlinkage long sys_shutdown(int fd, int how)
1720{
1721 int err, fput_needed;
1722 struct socket *sock;
1723
1724 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1725 if (sock != NULL) {
1726 err = security_socket_shutdown(sock, how);
1727 if (!err)
1728 err = sock->ops->shutdown(sock, how);
1729 fput_light(sock->file, fput_needed);
1730 }
1731 return err;
1732}
1733
1734/* A couple of helpful macros for getting the address of the 32/64 bit
1735 * fields which are the same type (int / unsigned) on our platforms.
1736 */
1737#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1738#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1739#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1740
1741/*
1742 * BSD sendmsg interface
1743 */
1744
1745asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
1746{
1747 struct compat_msghdr __user *msg_compat =
1748 (struct compat_msghdr __user *)msg;
1749 struct socket *sock;
1750 char address[MAX_SOCK_ADDR];
1751 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1752 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1753 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1754 /* 20 is size of ipv6_pktinfo */
1755 unsigned char *ctl_buf = ctl;
1756 struct msghdr msg_sys;
1757 int err, ctl_len, iov_size, total_len;
1758 int fput_needed;
1759
1760 err = -EFAULT;
1761 if (MSG_CMSG_COMPAT & flags) {
1762 if (get_compat_msghdr(&msg_sys, msg_compat))
1763 return -EFAULT;
1764 }
1765 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1766 return -EFAULT;
1767
1768 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1769 if (!sock)
1770 goto out;
1771
1772 /* do not move before msg_sys is valid */
1773 err = -EMSGSIZE;
1774 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1775 goto out_put;
1776
1777 /* Check whether to allocate the iovec area */
1778 err = -ENOMEM;
1779 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1780 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1781 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1782 if (!iov)
1783 goto out_put;
1784 }
1785
1786 /* This will also move the address data into kernel space */
1787 if (MSG_CMSG_COMPAT & flags) {
1788 err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
1789 } else
1790 err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
1791 if (err < 0)
1792 goto out_freeiov;
1793 total_len = err;
1794
1795 err = -ENOBUFS;
1796
1797 if (msg_sys.msg_controllen > INT_MAX)
1798 goto out_freeiov;
1799 ctl_len = msg_sys.msg_controllen;
1800 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1801 err =
1802 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
1803 sizeof(ctl));
1804 if (err)
1805 goto out_freeiov;
1806 ctl_buf = msg_sys.msg_control;
1807 ctl_len = msg_sys.msg_controllen;
1808 } else if (ctl_len) {
1809 if (ctl_len > sizeof(ctl)) {
1810 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1811 if (ctl_buf == NULL)
1812 goto out_freeiov;
1813 }
1814 err = -EFAULT;
1815 /*
1816 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1817 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1818 * checking falls down on this.
1819 */
1820 if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
1821 ctl_len))
1822 goto out_freectl;
1823 msg_sys.msg_control = ctl_buf;
1824 }
1825 msg_sys.msg_flags = flags;
1826
1827 if (sock->file->f_flags & O_NONBLOCK)
1828 msg_sys.msg_flags |= MSG_DONTWAIT;
1829 err = sock_sendmsg(sock, &msg_sys, total_len);
1830
1831out_freectl:
1832 if (ctl_buf != ctl)
1833 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1834out_freeiov:
1835 if (iov != iovstack)
1836 sock_kfree_s(sock->sk, iov, iov_size);
1837out_put:
1838 fput_light(sock->file, fput_needed);
1839out:
1840 return err;
1841}
1842
1843/*
1844 * BSD recvmsg interface
1845 */
1846
1847asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
1848 unsigned int flags)
1849{
1850 struct compat_msghdr __user *msg_compat =
1851 (struct compat_msghdr __user *)msg;
1852 struct socket *sock;
1853 struct iovec iovstack[UIO_FASTIOV];
1854 struct iovec *iov = iovstack;
1855 struct msghdr msg_sys;
1856 unsigned long cmsg_ptr;
1857 int err, iov_size, total_len, len;
1858 int fput_needed;
1859
1860 /* kernel mode address */
1861 char addr[MAX_SOCK_ADDR];
1862
1863 /* user mode address pointers */
1864 struct sockaddr __user *uaddr;
1865 int __user *uaddr_len;
1866
1867 if (MSG_CMSG_COMPAT & flags) {
1868 if (get_compat_msghdr(&msg_sys, msg_compat))
1869 return -EFAULT;
1870 }
1871 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1872 return -EFAULT;
1873
1874 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1875 if (!sock)
1876 goto out;
1877
1878 err = -EMSGSIZE;
1879 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1880 goto out_put;
1881
1882 /* Check whether to allocate the iovec area */
1883 err = -ENOMEM;
1884 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1885 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1886 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1887 if (!iov)
1888 goto out_put;
1889 }
1890
1891 /*
1892 * Save the user-mode address (verify_iovec will change the
1893 * kernel msghdr to use the kernel address space)
1894 */
1895
1896 uaddr = (void __user *)msg_sys.msg_name;
1897 uaddr_len = COMPAT_NAMELEN(msg);
1898 if (MSG_CMSG_COMPAT & flags) {
1899 err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1900 } else
1901 err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1902 if (err < 0)
1903 goto out_freeiov;
1904 total_len = err;
1905
1906 cmsg_ptr = (unsigned long)msg_sys.msg_control;
1907 msg_sys.msg_flags = 0;
1908 if (MSG_CMSG_COMPAT & flags)
1909 msg_sys.msg_flags = MSG_CMSG_COMPAT;
1910
1911 if (sock->file->f_flags & O_NONBLOCK)
1912 flags |= MSG_DONTWAIT;
1913 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
1914 if (err < 0)
1915 goto out_freeiov;
1916 len = err;
1917
1918 if (uaddr != NULL) {
1919 err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr,
1920 uaddr_len);
1921 if (err < 0)
1922 goto out_freeiov;
1923 }
1924 err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT),
1925 COMPAT_FLAGS(msg));
1926 if (err)
1927 goto out_freeiov;
1928 if (MSG_CMSG_COMPAT & flags)
1929 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
1930 &msg_compat->msg_controllen);
1931 else
1932 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
1933 &msg->msg_controllen);
1934 if (err)
1935 goto out_freeiov;
1936 err = len;
1937
1938out_freeiov:
1939 if (iov != iovstack)
1940 sock_kfree_s(sock->sk, iov, iov_size);
1941out_put:
1942 fput_light(sock->file, fput_needed);
1943out:
1944 return err;
1945}
1946
1947#ifdef __ARCH_WANT_SYS_SOCKETCALL
1948
1949/* Argument list sizes for sys_socketcall */
1950#define AL(x) ((x) * sizeof(unsigned long))
1951static const unsigned char nargs[18]={
1952 AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1953 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
1954 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)
1955};
1956
1957#undef AL
1958
1959/*
1960 * System call vectors.
1961 *
1962 * Argument checking cleaned up. Saved 20% in size.
1963 * This function doesn't need to set the kernel lock because
1964 * it is set by the callees.
1965 */
1966
1967asmlinkage long sys_socketcall(int call, unsigned long __user *args)
1968{
1969 unsigned long a[6];
1970 unsigned long a0, a1;
1971 int err;
1972
1973 if (call < 1 || call > SYS_RECVMSG)
1974 return -EINVAL;
1975
1976 /* copy_from_user should be SMP safe. */
1977 if (copy_from_user(a, args, nargs[call]))
1978 return -EFAULT;
1979
1980 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
1981 if (err)
1982 return err;
1983
1984 a0 = a[0];
1985 a1 = a[1];
1986
1987 switch (call) {
1988 case SYS_SOCKET:
1989 err = sys_socket(a0, a1, a[2]);
1990 break;
1991 case SYS_BIND:
1992 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
1993 break;
1994 case SYS_CONNECT:
1995 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
1996 break;
1997 case SYS_LISTEN:
1998 err = sys_listen(a0, a1);
1999 break;
2000 case SYS_ACCEPT:
2001 err =
2002 sys_accept(a0, (struct sockaddr __user *)a1,
2003 (int __user *)a[2]);
2004 break;
2005 case SYS_GETSOCKNAME:
2006 err =
2007 sys_getsockname(a0, (struct sockaddr __user *)a1,
2008 (int __user *)a[2]);
2009 break;
2010 case SYS_GETPEERNAME:
2011 err =
2012 sys_getpeername(a0, (struct sockaddr __user *)a1,
2013 (int __user *)a[2]);
2014 break;
2015 case SYS_SOCKETPAIR:
2016 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2017 break;
2018 case SYS_SEND:
2019 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2020 break;
2021 case SYS_SENDTO:
2022 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2023 (struct sockaddr __user *)a[4], a[5]);
2024 break;
2025 case SYS_RECV:
2026 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2027 break;
2028 case SYS_RECVFROM:
2029 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2030 (struct sockaddr __user *)a[4],
2031 (int __user *)a[5]);
2032 break;
2033 case SYS_SHUTDOWN:
2034 err = sys_shutdown(a0, a1);
2035 break;
2036 case SYS_SETSOCKOPT:
2037 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2038 break;
2039 case SYS_GETSOCKOPT:
2040 err =
2041 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2042 (int __user *)a[4]);
2043 break;
2044 case SYS_SENDMSG:
2045 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2046 break;
2047 case SYS_RECVMSG:
2048 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2049 break;
2050 default:
2051 err = -EINVAL;
2052 break;
2053 }
2054 return err;
2055}
2056
2057#endif /* __ARCH_WANT_SYS_SOCKETCALL */
2058
2059/**
2060 * sock_register - add a socket protocol handler
2061 * @ops: description of protocol
2062 *
2063 * This function is called by a protocol handler that wants to
2064 * advertise its address family, and have it linked into the
2065 * socket interface. The value ops->family coresponds to the
2066 * socket system call protocol family.
2067 */
2068int sock_register(const struct net_proto_family *ops)
2069{
2070 int err;
2071
2072 if (ops->family >= NPROTO) {
2073 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2074 NPROTO);
2075 return -ENOBUFS;
2076 }
2077
2078 spin_lock(&net_family_lock);
2079 if (net_families[ops->family])
2080 err = -EEXIST;
2081 else {
2082 net_families[ops->family] = ops;
2083 err = 0;
2084 }
2085 spin_unlock(&net_family_lock);
2086
2087 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
2088 return err;
2089}
2090
2091/**
2092 * sock_unregister - remove a protocol handler
2093 * @family: protocol family to remove
2094 *
2095 * This function is called by a protocol handler that wants to
2096 * remove its address family, and have it unlinked from the
2097 * new socket creation.
2098 *
2099 * If protocol handler is a module, then it can use module reference
2100 * counts to protect against new references. If protocol handler is not
2101 * a module then it needs to provide its own protection in
2102 * the ops->create routine.
2103 */
2104void sock_unregister(int family)
2105{
2106 BUG_ON(family < 0 || family >= NPROTO);
2107
2108 spin_lock(&net_family_lock);
2109 net_families[family] = NULL;
2110 spin_unlock(&net_family_lock);
2111
2112 synchronize_rcu();
2113
2114 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
2115}
2116
2117static int __init sock_init(void)
2118{
2119 /*
2120 * Initialize sock SLAB cache.
2121 */
2122
2123 sk_init();
2124
2125 /*
2126 * Initialize skbuff SLAB cache
2127 */
2128 skb_init();
2129
2130 /*
2131 * Initialize the protocols module.
2132 */
2133
2134 init_inodecache();
2135 register_filesystem(&sock_fs_type);
2136 sock_mnt = kern_mount(&sock_fs_type);
2137
2138 /* The real protocol initialization is performed in later initcalls.
2139 */
2140
2141#ifdef CONFIG_NETFILTER
2142 netfilter_init();
2143#endif
2144
2145 return 0;
2146}
2147
2148core_initcall(sock_init); /* early initcall */
2149
2150#ifdef CONFIG_PROC_FS
2151void socket_seq_show(struct seq_file *seq)
2152{
2153 int cpu;
2154 int counter = 0;
2155
2156 for_each_possible_cpu(cpu)
2157 counter += per_cpu(sockets_in_use, cpu);
2158
2159 /* It can be negative, by the way. 8) */
2160 if (counter < 0)
2161 counter = 0;
2162
2163 seq_printf(seq, "sockets: used %d\n", counter);
2164}
2165#endif /* CONFIG_PROC_FS */
2166
2167#ifdef CONFIG_COMPAT
2168static long compat_sock_ioctl(struct file *file, unsigned cmd,
2169 unsigned long arg)
2170{
2171 struct socket *sock = file->private_data;
2172 int ret = -ENOIOCTLCMD;
2173
2174 if (sock->ops->compat_ioctl)
2175 ret = sock->ops->compat_ioctl(sock, cmd, arg);
2176
2177 return ret;
2178}
2179#endif
2180
2181int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
2182{
2183 return sock->ops->bind(sock, addr, addrlen);
2184}
2185
2186int kernel_listen(struct socket *sock, int backlog)
2187{
2188 return sock->ops->listen(sock, backlog);
2189}
2190
2191int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
2192{
2193 struct sock *sk = sock->sk;
2194 int err;
2195
2196 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
2197 newsock);
2198 if (err < 0)
2199 goto done;
2200
2201 err = sock->ops->accept(sock, *newsock, flags);
2202 if (err < 0) {
2203 sock_release(*newsock);
2204 goto done;
2205 }
2206
2207 (*newsock)->ops = sock->ops;
2208
2209done:
2210 return err;
2211}
2212
2213int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
2214 int flags)
2215{
2216 return sock->ops->connect(sock, addr, addrlen, flags);
2217}
2218
2219int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
2220 int *addrlen)
2221{
2222 return sock->ops->getname(sock, addr, addrlen, 0);
2223}
2224
2225int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
2226 int *addrlen)
2227{
2228 return sock->ops->getname(sock, addr, addrlen, 1);
2229}
2230
2231int kernel_getsockopt(struct socket *sock, int level, int optname,
2232 char *optval, int *optlen)
2233{
2234 mm_segment_t oldfs = get_fs();
2235 int err;
2236
2237 set_fs(KERNEL_DS);
2238 if (level == SOL_SOCKET)
2239 err = sock_getsockopt(sock, level, optname, optval, optlen);
2240 else
2241 err = sock->ops->getsockopt(sock, level, optname, optval,
2242 optlen);
2243 set_fs(oldfs);
2244 return err;
2245}
2246
2247int kernel_setsockopt(struct socket *sock, int level, int optname,
2248 char *optval, int optlen)
2249{
2250 mm_segment_t oldfs = get_fs();
2251 int err;
2252
2253 set_fs(KERNEL_DS);
2254 if (level == SOL_SOCKET)
2255 err = sock_setsockopt(sock, level, optname, optval, optlen);
2256 else
2257 err = sock->ops->setsockopt(sock, level, optname, optval,
2258 optlen);
2259 set_fs(oldfs);
2260 return err;
2261}
2262
2263int kernel_sendpage(struct socket *sock, struct page *page, int offset,
2264 size_t size, int flags)
2265{
2266 if (sock->ops->sendpage)
2267 return sock->ops->sendpage(sock, page, offset, size, flags);
2268
2269 return sock_no_sendpage(sock, page, offset, size, flags);
2270}
2271
2272int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
2273{
2274 mm_segment_t oldfs = get_fs();
2275 int err;
2276
2277 set_fs(KERNEL_DS);
2278 err = sock->ops->ioctl(sock, cmd, arg);
2279 set_fs(oldfs);
2280
2281 return err;
2282}
2283
2284/* ABI emulation layers need these two */
2285EXPORT_SYMBOL(move_addr_to_kernel);
2286EXPORT_SYMBOL(move_addr_to_user);
2287EXPORT_SYMBOL(sock_create);
2288EXPORT_SYMBOL(sock_create_kern);
2289EXPORT_SYMBOL(sock_create_lite);
2290EXPORT_SYMBOL(sock_map_fd);
2291EXPORT_SYMBOL(sock_recvmsg);
2292EXPORT_SYMBOL(sock_register);
2293EXPORT_SYMBOL(sock_release);
2294EXPORT_SYMBOL(sock_sendmsg);
2295EXPORT_SYMBOL(sock_unregister);
2296EXPORT_SYMBOL(sock_wake_async);
2297EXPORT_SYMBOL(sockfd_lookup);
2298EXPORT_SYMBOL(kernel_sendmsg);
2299EXPORT_SYMBOL(kernel_recvmsg);
2300EXPORT_SYMBOL(kernel_bind);
2301EXPORT_SYMBOL(kernel_listen);
2302EXPORT_SYMBOL(kernel_accept);
2303EXPORT_SYMBOL(kernel_connect);
2304EXPORT_SYMBOL(kernel_getsockname);
2305EXPORT_SYMBOL(kernel_getpeername);
2306EXPORT_SYMBOL(kernel_getsockopt);
2307EXPORT_SYMBOL(kernel_setsockopt);
2308EXPORT_SYMBOL(kernel_sendpage);
2309EXPORT_SYMBOL(kernel_sock_ioctl);