projects/linux·blob v2.6.26 · 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#include <linux/nsproxy.h>
88
89#include <asm/uaccess.h>
90#include <asm/unistd.h>
91
92#include <net/compat.h>
93
94#include <net/sock.h>
95#include <linux/netfilter.h>
96
97static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
98static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
99 unsigned long nr_segs, loff_t pos);
100static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
101 unsigned long nr_segs, loff_t pos);
102static int sock_mmap(struct file *file, struct vm_area_struct *vma);
103
104static int sock_close(struct inode *inode, struct file *file);
105static unsigned int sock_poll(struct file *file,
106 struct poll_table_struct *wait);
107static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
108#ifdef CONFIG_COMPAT
109static long compat_sock_ioctl(struct file *file,
110 unsigned int cmd, unsigned long arg);
111#endif
112static int sock_fasync(int fd, struct file *filp, int on);
113static ssize_t sock_sendpage(struct file *file, struct page *page,
114 int offset, size_t size, loff_t *ppos, int more);
115static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
116 struct pipe_inode_info *pipe, size_t len,
117 unsigned int flags);
118
119/*
120 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
121 * in the operation structures but are done directly via the socketcall() multiplexor.
122 */
123
124static const struct file_operations socket_file_ops = {
125 .owner = THIS_MODULE,
126 .llseek = no_llseek,
127 .aio_read = sock_aio_read,
128 .aio_write = sock_aio_write,
129 .poll = sock_poll,
130 .unlocked_ioctl = sock_ioctl,
131#ifdef CONFIG_COMPAT
132 .compat_ioctl = compat_sock_ioctl,
133#endif
134 .mmap = sock_mmap,
135 .open = sock_no_open, /* special open code to disallow open via /proc */
136 .release = sock_close,
137 .fasync = sock_fasync,
138 .sendpage = sock_sendpage,
139 .splice_write = generic_splice_sendpage,
140 .splice_read = sock_splice_read,
141};
142
143/*
144 * The protocol list. Each protocol is registered in here.
145 */
146
147static DEFINE_SPINLOCK(net_family_lock);
148static const struct net_proto_family *net_families[NPROTO] __read_mostly;
149
150/*
151 * Statistics counters of the socket lists
152 */
153
154static DEFINE_PER_CPU(int, sockets_in_use) = 0;
155
156/*
157 * Support routines.
158 * Move socket addresses back and forth across the kernel/user
159 * divide and look after the messy bits.
160 */
161
162#define MAX_SOCK_ADDR 128 /* 108 for Unix domain -
163 16 for IP, 16 for IPX,
164 24 for IPv6,
165 about 80 for AX.25
166 must be at least one bigger than
167 the AF_UNIX size (see net/unix/af_unix.c
168 :unix_mkname()).
169 */
170
171/**
172 * move_addr_to_kernel - copy a socket address into kernel space
173 * @uaddr: Address in user space
174 * @kaddr: Address in kernel space
175 * @ulen: Length in user space
176 *
177 * The address is copied into kernel space. If the provided address is
178 * too long an error code of -EINVAL is returned. If the copy gives
179 * invalid addresses -EFAULT is returned. On a success 0 is returned.
180 */
181
182int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
183{
184 if (ulen < 0 || ulen > MAX_SOCK_ADDR)
185 return -EINVAL;
186 if (ulen == 0)
187 return 0;
188 if (copy_from_user(kaddr, uaddr, ulen))
189 return -EFAULT;
190 return audit_sockaddr(ulen, kaddr);
191}
192
193/**
194 * move_addr_to_user - copy an address to user space
195 * @kaddr: kernel space address
196 * @klen: length of address in kernel
197 * @uaddr: user space address
198 * @ulen: pointer to user length field
199 *
200 * The value pointed to by ulen on entry is the buffer length available.
201 * This is overwritten with the buffer space used. -EINVAL is returned
202 * if an overlong buffer is specified or a negative buffer size. -EFAULT
203 * is returned if either the buffer or the length field are not
204 * accessible.
205 * After copying the data up to the limit the user specifies, the true
206 * length of the data is written over the length limit the user
207 * specified. Zero is returned for a success.
208 */
209
210int move_addr_to_user(void *kaddr, int klen, void __user *uaddr,
211 int __user *ulen)
212{
213 int err;
214 int len;
215
216 err = get_user(len, ulen);
217 if (err)
218 return err;
219 if (len > klen)
220 len = klen;
221 if (len < 0 || len > MAX_SOCK_ADDR)
222 return -EINVAL;
223 if (len) {
224 if (audit_sockaddr(klen, kaddr))
225 return -ENOMEM;
226 if (copy_to_user(uaddr, kaddr, len))
227 return -EFAULT;
228 }
229 /*
230 * "fromlen shall refer to the value before truncation.."
231 * 1003.1g
232 */
233 return __put_user(klen, ulen);
234}
235
236#define SOCKFS_MAGIC 0x534F434B
237
238static struct kmem_cache *sock_inode_cachep __read_mostly;
239
240static struct inode *sock_alloc_inode(struct super_block *sb)
241{
242 struct socket_alloc *ei;
243
244 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
245 if (!ei)
246 return NULL;
247 init_waitqueue_head(&ei->socket.wait);
248
249 ei->socket.fasync_list = NULL;
250 ei->socket.state = SS_UNCONNECTED;
251 ei->socket.flags = 0;
252 ei->socket.ops = NULL;
253 ei->socket.sk = NULL;
254 ei->socket.file = NULL;
255
256 return &ei->vfs_inode;
257}
258
259static void sock_destroy_inode(struct inode *inode)
260{
261 kmem_cache_free(sock_inode_cachep,
262 container_of(inode, struct socket_alloc, vfs_inode));
263}
264
265static void init_once(struct kmem_cache *cachep, void *foo)
266{
267 struct socket_alloc *ei = (struct socket_alloc *)foo;
268
269 inode_init_once(&ei->vfs_inode);
270}
271
272static int init_inodecache(void)
273{
274 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
275 sizeof(struct socket_alloc),
276 0,
277 (SLAB_HWCACHE_ALIGN |
278 SLAB_RECLAIM_ACCOUNT |
279 SLAB_MEM_SPREAD),
280 init_once);
281 if (sock_inode_cachep == NULL)
282 return -ENOMEM;
283 return 0;
284}
285
286static struct super_operations sockfs_ops = {
287 .alloc_inode = sock_alloc_inode,
288 .destroy_inode =sock_destroy_inode,
289 .statfs = simple_statfs,
290};
291
292static int sockfs_get_sb(struct file_system_type *fs_type,
293 int flags, const char *dev_name, void *data,
294 struct vfsmount *mnt)
295{
296 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
297 mnt);
298}
299
300static struct vfsmount *sock_mnt __read_mostly;
301
302static struct file_system_type sock_fs_type = {
303 .name = "sockfs",
304 .get_sb = sockfs_get_sb,
305 .kill_sb = kill_anon_super,
306};
307
308static int sockfs_delete_dentry(struct dentry *dentry)
309{
310 /*
311 * At creation time, we pretended this dentry was hashed
312 * (by clearing DCACHE_UNHASHED bit in d_flags)
313 * At delete time, we restore the truth : not hashed.
314 * (so that dput() can proceed correctly)
315 */
316 dentry->d_flags |= DCACHE_UNHASHED;
317 return 0;
318}
319
320/*
321 * sockfs_dname() is called from d_path().
322 */
323static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
324{
325 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
326 dentry->d_inode->i_ino);
327}
328
329static struct dentry_operations sockfs_dentry_operations = {
330 .d_delete = sockfs_delete_dentry,
331 .d_dname = sockfs_dname,
332};
333
334/*
335 * Obtains the first available file descriptor and sets it up for use.
336 *
337 * These functions create file structures and maps them to fd space
338 * of the current process. On success it returns file descriptor
339 * and file struct implicitly stored in sock->file.
340 * Note that another thread may close file descriptor before we return
341 * from this function. We use the fact that now we do not refer
342 * to socket after mapping. If one day we will need it, this
343 * function will increment ref. count on file by 1.
344 *
345 * In any case returned fd MAY BE not valid!
346 * This race condition is unavoidable
347 * with shared fd spaces, we cannot solve it inside kernel,
348 * but we take care of internal coherence yet.
349 */
350
351static int sock_alloc_fd(struct file **filep)
352{
353 int fd;
354
355 fd = get_unused_fd();
356 if (likely(fd >= 0)) {
357 struct file *file = get_empty_filp();
358
359 *filep = file;
360 if (unlikely(!file)) {
361 put_unused_fd(fd);
362 return -ENFILE;
363 }
364 } else
365 *filep = NULL;
366 return fd;
367}
368
369static int sock_attach_fd(struct socket *sock, struct file *file)
370{
371 struct dentry *dentry;
372 struct qstr name = { .name = "" };
373
374 dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
375 if (unlikely(!dentry))
376 return -ENOMEM;
377
378 dentry->d_op = &sockfs_dentry_operations;
379 /*
380 * We dont want to push this dentry into global dentry hash table.
381 * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
382 * This permits a working /proc/$pid/fd/XXX on sockets
383 */
384 dentry->d_flags &= ~DCACHE_UNHASHED;
385 d_instantiate(dentry, SOCK_INODE(sock));
386
387 sock->file = file;
388 init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE,
389 &socket_file_ops);
390 SOCK_INODE(sock)->i_fop = &socket_file_ops;
391 file->f_flags = O_RDWR;
392 file->f_pos = 0;
393 file->private_data = sock;
394
395 return 0;
396}
397
398int sock_map_fd(struct socket *sock)
399{
400 struct file *newfile;
401 int fd = sock_alloc_fd(&newfile);
402
403 if (likely(fd >= 0)) {
404 int err = sock_attach_fd(sock, newfile);
405
406 if (unlikely(err < 0)) {
407 put_filp(newfile);
408 put_unused_fd(fd);
409 return err;
410 }
411 fd_install(fd, newfile);
412 }
413 return fd;
414}
415
416static struct socket *sock_from_file(struct file *file, int *err)
417{
418 if (file->f_op == &socket_file_ops)
419 return file->private_data; /* set in sock_map_fd */
420
421 *err = -ENOTSOCK;
422 return NULL;
423}
424
425/**
426 * sockfd_lookup - Go from a file number to its socket slot
427 * @fd: file handle
428 * @err: pointer to an error code return
429 *
430 * The file handle passed in is locked and the socket it is bound
431 * too is returned. If an error occurs the err pointer is overwritten
432 * with a negative errno code and NULL is returned. The function checks
433 * for both invalid handles and passing a handle which is not a socket.
434 *
435 * On a success the socket object pointer is returned.
436 */
437
438struct socket *sockfd_lookup(int fd, int *err)
439{
440 struct file *file;
441 struct socket *sock;
442
443 file = fget(fd);
444 if (!file) {
445 *err = -EBADF;
446 return NULL;
447 }
448
449 sock = sock_from_file(file, err);
450 if (!sock)
451 fput(file);
452 return sock;
453}
454
455static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
456{
457 struct file *file;
458 struct socket *sock;
459
460 *err = -EBADF;
461 file = fget_light(fd, fput_needed);
462 if (file) {
463 sock = sock_from_file(file, err);
464 if (sock)
465 return sock;
466 fput_light(file, *fput_needed);
467 }
468 return NULL;
469}
470
471/**
472 * sock_alloc - allocate a socket
473 *
474 * Allocate a new inode and socket object. The two are bound together
475 * and initialised. The socket is then returned. If we are out of inodes
476 * NULL is returned.
477 */
478
479static struct socket *sock_alloc(void)
480{
481 struct inode *inode;
482 struct socket *sock;
483
484 inode = new_inode(sock_mnt->mnt_sb);
485 if (!inode)
486 return NULL;
487
488 sock = SOCKET_I(inode);
489
490 inode->i_mode = S_IFSOCK | S_IRWXUGO;
491 inode->i_uid = current->fsuid;
492 inode->i_gid = current->fsgid;
493
494 get_cpu_var(sockets_in_use)++;
495 put_cpu_var(sockets_in_use);
496 return sock;
497}
498
499/*
500 * In theory you can't get an open on this inode, but /proc provides
501 * a back door. Remember to keep it shut otherwise you'll let the
502 * creepy crawlies in.
503 */
504
505static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
506{
507 return -ENXIO;
508}
509
510const struct file_operations bad_sock_fops = {
511 .owner = THIS_MODULE,
512 .open = sock_no_open,
513};
514
515/**
516 * sock_release - close a socket
517 * @sock: socket to close
518 *
519 * The socket is released from the protocol stack if it has a release
520 * callback, and the inode is then released if the socket is bound to
521 * an inode not a file.
522 */
523
524void sock_release(struct socket *sock)
525{
526 if (sock->ops) {
527 struct module *owner = sock->ops->owner;
528
529 sock->ops->release(sock);
530 sock->ops = NULL;
531 module_put(owner);
532 }
533
534 if (sock->fasync_list)
535 printk(KERN_ERR "sock_release: fasync list not empty!\n");
536
537 get_cpu_var(sockets_in_use)--;
538 put_cpu_var(sockets_in_use);
539 if (!sock->file) {
540 iput(SOCK_INODE(sock));
541 return;
542 }
543 sock->file = NULL;
544}
545
546static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
547 struct msghdr *msg, size_t size)
548{
549 struct sock_iocb *si = kiocb_to_siocb(iocb);
550 int err;
551
552 si->sock = sock;
553 si->scm = NULL;
554 si->msg = msg;
555 si->size = size;
556
557 err = security_socket_sendmsg(sock, msg, size);
558 if (err)
559 return err;
560
561 return sock->ops->sendmsg(iocb, sock, msg, size);
562}
563
564int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
565{
566 struct kiocb iocb;
567 struct sock_iocb siocb;
568 int ret;
569
570 init_sync_kiocb(&iocb, NULL);
571 iocb.private = &siocb;
572 ret = __sock_sendmsg(&iocb, sock, msg, size);
573 if (-EIOCBQUEUED == ret)
574 ret = wait_on_sync_kiocb(&iocb);
575 return ret;
576}
577
578int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
579 struct kvec *vec, size_t num, size_t size)
580{
581 mm_segment_t oldfs = get_fs();
582 int result;
583
584 set_fs(KERNEL_DS);
585 /*
586 * the following is safe, since for compiler definitions of kvec and
587 * iovec are identical, yielding the same in-core layout and alignment
588 */
589 msg->msg_iov = (struct iovec *)vec;
590 msg->msg_iovlen = num;
591 result = sock_sendmsg(sock, msg, size);
592 set_fs(oldfs);
593 return result;
594}
595
596/*
597 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
598 */
599void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
600 struct sk_buff *skb)
601{
602 ktime_t kt = skb->tstamp;
603
604 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
605 struct timeval tv;
606 /* Race occurred between timestamp enabling and packet
607 receiving. Fill in the current time for now. */
608 if (kt.tv64 == 0)
609 kt = ktime_get_real();
610 skb->tstamp = kt;
611 tv = ktime_to_timeval(kt);
612 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, sizeof(tv), &tv);
613 } else {
614 struct timespec ts;
615 /* Race occurred between timestamp enabling and packet
616 receiving. Fill in the current time for now. */
617 if (kt.tv64 == 0)
618 kt = ktime_get_real();
619 skb->tstamp = kt;
620 ts = ktime_to_timespec(kt);
621 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, sizeof(ts), &ts);
622 }
623}
624
625EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
626
627static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
628 struct msghdr *msg, size_t size, int flags)
629{
630 int err;
631 struct sock_iocb *si = kiocb_to_siocb(iocb);
632
633 si->sock = sock;
634 si->scm = NULL;
635 si->msg = msg;
636 si->size = size;
637 si->flags = flags;
638
639 err = security_socket_recvmsg(sock, msg, size, flags);
640 if (err)
641 return err;
642
643 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
644}
645
646int sock_recvmsg(struct socket *sock, struct msghdr *msg,
647 size_t size, int flags)
648{
649 struct kiocb iocb;
650 struct sock_iocb siocb;
651 int ret;
652
653 init_sync_kiocb(&iocb, NULL);
654 iocb.private = &siocb;
655 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
656 if (-EIOCBQUEUED == ret)
657 ret = wait_on_sync_kiocb(&iocb);
658 return ret;
659}
660
661int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
662 struct kvec *vec, size_t num, size_t size, int flags)
663{
664 mm_segment_t oldfs = get_fs();
665 int result;
666
667 set_fs(KERNEL_DS);
668 /*
669 * the following is safe, since for compiler definitions of kvec and
670 * iovec are identical, yielding the same in-core layout and alignment
671 */
672 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
673 result = sock_recvmsg(sock, msg, size, flags);
674 set_fs(oldfs);
675 return result;
676}
677
678static void sock_aio_dtor(struct kiocb *iocb)
679{
680 kfree(iocb->private);
681}
682
683static ssize_t sock_sendpage(struct file *file, struct page *page,
684 int offset, size_t size, loff_t *ppos, int more)
685{
686 struct socket *sock;
687 int flags;
688
689 sock = file->private_data;
690
691 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
692 if (more)
693 flags |= MSG_MORE;
694
695 return sock->ops->sendpage(sock, page, offset, size, flags);
696}
697
698static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
699 struct pipe_inode_info *pipe, size_t len,
700 unsigned int flags)
701{
702 struct socket *sock = file->private_data;
703
704 if (unlikely(!sock->ops->splice_read))
705 return -EINVAL;
706
707 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
708}
709
710static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
711 struct sock_iocb *siocb)
712{
713 if (!is_sync_kiocb(iocb)) {
714 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
715 if (!siocb)
716 return NULL;
717 iocb->ki_dtor = sock_aio_dtor;
718 }
719
720 siocb->kiocb = iocb;
721 iocb->private = siocb;
722 return siocb;
723}
724
725static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
726 struct file *file, const struct iovec *iov,
727 unsigned long nr_segs)
728{
729 struct socket *sock = file->private_data;
730 size_t size = 0;
731 int i;
732
733 for (i = 0; i < nr_segs; i++)
734 size += iov[i].iov_len;
735
736 msg->msg_name = NULL;
737 msg->msg_namelen = 0;
738 msg->msg_control = NULL;
739 msg->msg_controllen = 0;
740 msg->msg_iov = (struct iovec *)iov;
741 msg->msg_iovlen = nr_segs;
742 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
743
744 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
745}
746
747static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
748 unsigned long nr_segs, loff_t pos)
749{
750 struct sock_iocb siocb, *x;
751
752 if (pos != 0)
753 return -ESPIPE;
754
755 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
756 return 0;
757
758
759 x = alloc_sock_iocb(iocb, &siocb);
760 if (!x)
761 return -ENOMEM;
762 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
763}
764
765static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
766 struct file *file, const struct iovec *iov,
767 unsigned long nr_segs)
768{
769 struct socket *sock = file->private_data;
770 size_t size = 0;
771 int i;
772
773 for (i = 0; i < nr_segs; i++)
774 size += iov[i].iov_len;
775
776 msg->msg_name = NULL;
777 msg->msg_namelen = 0;
778 msg->msg_control = NULL;
779 msg->msg_controllen = 0;
780 msg->msg_iov = (struct iovec *)iov;
781 msg->msg_iovlen = nr_segs;
782 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
783 if (sock->type == SOCK_SEQPACKET)
784 msg->msg_flags |= MSG_EOR;
785
786 return __sock_sendmsg(iocb, sock, msg, size);
787}
788
789static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
790 unsigned long nr_segs, loff_t pos)
791{
792 struct sock_iocb siocb, *x;
793
794 if (pos != 0)
795 return -ESPIPE;
796
797 x = alloc_sock_iocb(iocb, &siocb);
798 if (!x)
799 return -ENOMEM;
800
801 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
802}
803
804/*
805 * Atomic setting of ioctl hooks to avoid race
806 * with module unload.
807 */
808
809static DEFINE_MUTEX(br_ioctl_mutex);
810static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL;
811
812void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
813{
814 mutex_lock(&br_ioctl_mutex);
815 br_ioctl_hook = hook;
816 mutex_unlock(&br_ioctl_mutex);
817}
818
819EXPORT_SYMBOL(brioctl_set);
820
821static DEFINE_MUTEX(vlan_ioctl_mutex);
822static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
823
824void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
825{
826 mutex_lock(&vlan_ioctl_mutex);
827 vlan_ioctl_hook = hook;
828 mutex_unlock(&vlan_ioctl_mutex);
829}
830
831EXPORT_SYMBOL(vlan_ioctl_set);
832
833static DEFINE_MUTEX(dlci_ioctl_mutex);
834static int (*dlci_ioctl_hook) (unsigned int, void __user *);
835
836void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
837{
838 mutex_lock(&dlci_ioctl_mutex);
839 dlci_ioctl_hook = hook;
840 mutex_unlock(&dlci_ioctl_mutex);
841}
842
843EXPORT_SYMBOL(dlci_ioctl_set);
844
845/*
846 * With an ioctl, arg may well be a user mode pointer, but we don't know
847 * what to do with it - that's up to the protocol still.
848 */
849
850static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
851{
852 struct socket *sock;
853 struct sock *sk;
854 void __user *argp = (void __user *)arg;
855 int pid, err;
856 struct net *net;
857
858 sock = file->private_data;
859 sk = sock->sk;
860 net = sock_net(sk);
861 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
862 err = dev_ioctl(net, cmd, argp);
863 } else
864#ifdef CONFIG_WIRELESS_EXT
865 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
866 err = dev_ioctl(net, cmd, argp);
867 } else
868#endif /* CONFIG_WIRELESS_EXT */
869 switch (cmd) {
870 case FIOSETOWN:
871 case SIOCSPGRP:
872 err = -EFAULT;
873 if (get_user(pid, (int __user *)argp))
874 break;
875 err = f_setown(sock->file, pid, 1);
876 break;
877 case FIOGETOWN:
878 case SIOCGPGRP:
879 err = put_user(f_getown(sock->file),
880 (int __user *)argp);
881 break;
882 case SIOCGIFBR:
883 case SIOCSIFBR:
884 case SIOCBRADDBR:
885 case SIOCBRDELBR:
886 err = -ENOPKG;
887 if (!br_ioctl_hook)
888 request_module("bridge");
889
890 mutex_lock(&br_ioctl_mutex);
891 if (br_ioctl_hook)
892 err = br_ioctl_hook(net, cmd, argp);
893 mutex_unlock(&br_ioctl_mutex);
894 break;
895 case SIOCGIFVLAN:
896 case SIOCSIFVLAN:
897 err = -ENOPKG;
898 if (!vlan_ioctl_hook)
899 request_module("8021q");
900
901 mutex_lock(&vlan_ioctl_mutex);
902 if (vlan_ioctl_hook)
903 err = vlan_ioctl_hook(net, argp);
904 mutex_unlock(&vlan_ioctl_mutex);
905 break;
906 case SIOCADDDLCI:
907 case SIOCDELDLCI:
908 err = -ENOPKG;
909 if (!dlci_ioctl_hook)
910 request_module("dlci");
911
912 mutex_lock(&dlci_ioctl_mutex);
913 if (dlci_ioctl_hook)
914 err = dlci_ioctl_hook(cmd, argp);
915 mutex_unlock(&dlci_ioctl_mutex);
916 break;
917 default:
918 err = sock->ops->ioctl(sock, cmd, arg);
919
920 /*
921 * If this ioctl is unknown try to hand it down
922 * to the NIC driver.
923 */
924 if (err == -ENOIOCTLCMD)
925 err = dev_ioctl(net, cmd, argp);
926 break;
927 }
928 return err;
929}
930
931int sock_create_lite(int family, int type, int protocol, struct socket **res)
932{
933 int err;
934 struct socket *sock = NULL;
935
936 err = security_socket_create(family, type, protocol, 1);
937 if (err)
938 goto out;
939
940 sock = sock_alloc();
941 if (!sock) {
942 err = -ENOMEM;
943 goto out;
944 }
945
946 sock->type = type;
947 err = security_socket_post_create(sock, family, type, protocol, 1);
948 if (err)
949 goto out_release;
950
951out:
952 *res = sock;
953 return err;
954out_release:
955 sock_release(sock);
956 sock = NULL;
957 goto out;
958}
959
960/* No kernel lock held - perfect */
961static unsigned int sock_poll(struct file *file, poll_table *wait)
962{
963 struct socket *sock;
964
965 /*
966 * We can't return errors to poll, so it's either yes or no.
967 */
968 sock = file->private_data;
969 return sock->ops->poll(file, sock, wait);
970}
971
972static int sock_mmap(struct file *file, struct vm_area_struct *vma)
973{
974 struct socket *sock = file->private_data;
975
976 return sock->ops->mmap(file, sock, vma);
977}
978
979static int sock_close(struct inode *inode, struct file *filp)
980{
981 /*
982 * It was possible the inode is NULL we were
983 * closing an unfinished socket.
984 */
985
986 if (!inode) {
987 printk(KERN_DEBUG "sock_close: NULL inode\n");
988 return 0;
989 }
990 sock_fasync(-1, filp, 0);
991 sock_release(SOCKET_I(inode));
992 return 0;
993}
994
995/*
996 * Update the socket async list
997 *
998 * Fasync_list locking strategy.
999 *
1000 * 1. fasync_list is modified only under process context socket lock
1001 * i.e. under semaphore.
1002 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1003 * or under socket lock.
1004 * 3. fasync_list can be used from softirq context, so that
1005 * modification under socket lock have to be enhanced with
1006 * write_lock_bh(&sk->sk_callback_lock).
1007 * --ANK (990710)
1008 */
1009
1010static int sock_fasync(int fd, struct file *filp, int on)
1011{
1012 struct fasync_struct *fa, *fna = NULL, **prev;
1013 struct socket *sock;
1014 struct sock *sk;
1015
1016 if (on) {
1017 fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
1018 if (fna == NULL)
1019 return -ENOMEM;
1020 }
1021
1022 sock = filp->private_data;
1023
1024 sk = sock->sk;
1025 if (sk == NULL) {
1026 kfree(fna);
1027 return -EINVAL;
1028 }
1029
1030 lock_sock(sk);
1031
1032 prev = &(sock->fasync_list);
1033
1034 for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev)
1035 if (fa->fa_file == filp)
1036 break;
1037
1038 if (on) {
1039 if (fa != NULL) {
1040 write_lock_bh(&sk->sk_callback_lock);
1041 fa->fa_fd = fd;
1042 write_unlock_bh(&sk->sk_callback_lock);
1043
1044 kfree(fna);
1045 goto out;
1046 }
1047 fna->fa_file = filp;
1048 fna->fa_fd = fd;
1049 fna->magic = FASYNC_MAGIC;
1050 fna->fa_next = sock->fasync_list;
1051 write_lock_bh(&sk->sk_callback_lock);
1052 sock->fasync_list = fna;
1053 write_unlock_bh(&sk->sk_callback_lock);
1054 } else {
1055 if (fa != NULL) {
1056 write_lock_bh(&sk->sk_callback_lock);
1057 *prev = fa->fa_next;
1058 write_unlock_bh(&sk->sk_callback_lock);
1059 kfree(fa);
1060 }
1061 }
1062
1063out:
1064 release_sock(sock->sk);
1065 return 0;
1066}
1067
1068/* This function may be called only under socket lock or callback_lock */
1069
1070int sock_wake_async(struct socket *sock, int how, int band)
1071{
1072 if (!sock || !sock->fasync_list)
1073 return -1;
1074 switch (how) {
1075 case SOCK_WAKE_WAITD:
1076 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1077 break;
1078 goto call_kill;
1079 case SOCK_WAKE_SPACE:
1080 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1081 break;
1082 /* fall through */
1083 case SOCK_WAKE_IO:
1084call_kill:
1085 __kill_fasync(sock->fasync_list, SIGIO, band);
1086 break;
1087 case SOCK_WAKE_URG:
1088 __kill_fasync(sock->fasync_list, SIGURG, band);
1089 }
1090 return 0;
1091}
1092
1093static int __sock_create(struct net *net, int family, int type, int protocol,
1094 struct socket **res, int kern)
1095{
1096 int err;
1097 struct socket *sock;
1098 const struct net_proto_family *pf;
1099
1100 /*
1101 * Check protocol is in range
1102 */
1103 if (family < 0 || family >= NPROTO)
1104 return -EAFNOSUPPORT;
1105 if (type < 0 || type >= SOCK_MAX)
1106 return -EINVAL;
1107
1108 /* Compatibility.
1109
1110 This uglymoron is moved from INET layer to here to avoid
1111 deadlock in module load.
1112 */
1113 if (family == PF_INET && type == SOCK_PACKET) {
1114 static int warned;
1115 if (!warned) {
1116 warned = 1;
1117 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1118 current->comm);
1119 }
1120 family = PF_PACKET;
1121 }
1122
1123 err = security_socket_create(family, type, protocol, kern);
1124 if (err)
1125 return err;
1126
1127 /*
1128 * Allocate the socket and allow the family to set things up. if
1129 * the protocol is 0, the family is instructed to select an appropriate
1130 * default.
1131 */
1132 sock = sock_alloc();
1133 if (!sock) {
1134 if (net_ratelimit())
1135 printk(KERN_WARNING "socket: no more sockets\n");
1136 return -ENFILE; /* Not exactly a match, but its the
1137 closest posix thing */
1138 }
1139
1140 sock->type = type;
1141
1142#if defined(CONFIG_KMOD)
1143 /* Attempt to load a protocol module if the find failed.
1144 *
1145 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1146 * requested real, full-featured networking support upon configuration.
1147 * Otherwise module support will break!
1148 */
1149 if (net_families[family] == NULL)
1150 request_module("net-pf-%d", family);
1151#endif
1152
1153 rcu_read_lock();
1154 pf = rcu_dereference(net_families[family]);
1155 err = -EAFNOSUPPORT;
1156 if (!pf)
1157 goto out_release;
1158
1159 /*
1160 * We will call the ->create function, that possibly is in a loadable
1161 * module, so we have to bump that loadable module refcnt first.
1162 */
1163 if (!try_module_get(pf->owner))
1164 goto out_release;
1165
1166 /* Now protected by module ref count */
1167 rcu_read_unlock();
1168
1169 err = pf->create(net, sock, protocol);
1170 if (err < 0)
1171 goto out_module_put;
1172
1173 /*
1174 * Now to bump the refcnt of the [loadable] module that owns this
1175 * socket at sock_release time we decrement its refcnt.
1176 */
1177 if (!try_module_get(sock->ops->owner))
1178 goto out_module_busy;
1179
1180 /*
1181 * Now that we're done with the ->create function, the [loadable]
1182 * module can have its refcnt decremented
1183 */
1184 module_put(pf->owner);
1185 err = security_socket_post_create(sock, family, type, protocol, kern);
1186 if (err)
1187 goto out_sock_release;
1188 *res = sock;
1189
1190 return 0;
1191
1192out_module_busy:
1193 err = -EAFNOSUPPORT;
1194out_module_put:
1195 sock->ops = NULL;
1196 module_put(pf->owner);
1197out_sock_release:
1198 sock_release(sock);
1199 return err;
1200
1201out_release:
1202 rcu_read_unlock();
1203 goto out_sock_release;
1204}
1205
1206int sock_create(int family, int type, int protocol, struct socket **res)
1207{
1208 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1209}
1210
1211int sock_create_kern(int family, int type, int protocol, struct socket **res)
1212{
1213 return __sock_create(&init_net, family, type, protocol, res, 1);
1214}
1215
1216asmlinkage long sys_socket(int family, int type, int protocol)
1217{
1218 int retval;
1219 struct socket *sock;
1220
1221 retval = sock_create(family, type, protocol, &sock);
1222 if (retval < 0)
1223 goto out;
1224
1225 retval = sock_map_fd(sock);
1226 if (retval < 0)
1227 goto out_release;
1228
1229out:
1230 /* It may be already another descriptor 8) Not kernel problem. */
1231 return retval;
1232
1233out_release:
1234 sock_release(sock);
1235 return retval;
1236}
1237
1238/*
1239 * Create a pair of connected sockets.
1240 */
1241
1242asmlinkage long sys_socketpair(int family, int type, int protocol,
1243 int __user *usockvec)
1244{
1245 struct socket *sock1, *sock2;
1246 int fd1, fd2, err;
1247 struct file *newfile1, *newfile2;
1248
1249 /*
1250 * Obtain the first socket and check if the underlying protocol
1251 * supports the socketpair call.
1252 */
1253
1254 err = sock_create(family, type, protocol, &sock1);
1255 if (err < 0)
1256 goto out;
1257
1258 err = sock_create(family, type, protocol, &sock2);
1259 if (err < 0)
1260 goto out_release_1;
1261
1262 err = sock1->ops->socketpair(sock1, sock2);
1263 if (err < 0)
1264 goto out_release_both;
1265
1266 fd1 = sock_alloc_fd(&newfile1);
1267 if (unlikely(fd1 < 0)) {
1268 err = fd1;
1269 goto out_release_both;
1270 }
1271
1272 fd2 = sock_alloc_fd(&newfile2);
1273 if (unlikely(fd2 < 0)) {
1274 err = fd2;
1275 put_filp(newfile1);
1276 put_unused_fd(fd1);
1277 goto out_release_both;
1278 }
1279
1280 err = sock_attach_fd(sock1, newfile1);
1281 if (unlikely(err < 0)) {
1282 goto out_fd2;
1283 }
1284
1285 err = sock_attach_fd(sock2, newfile2);
1286 if (unlikely(err < 0)) {
1287 fput(newfile1);
1288 goto out_fd1;
1289 }
1290
1291 err = audit_fd_pair(fd1, fd2);
1292 if (err < 0) {
1293 fput(newfile1);
1294 fput(newfile2);
1295 goto out_fd;
1296 }
1297
1298 fd_install(fd1, newfile1);
1299 fd_install(fd2, newfile2);
1300 /* fd1 and fd2 may be already another descriptors.
1301 * Not kernel problem.
1302 */
1303
1304 err = put_user(fd1, &usockvec[0]);
1305 if (!err)
1306 err = put_user(fd2, &usockvec[1]);
1307 if (!err)
1308 return 0;
1309
1310 sys_close(fd2);
1311 sys_close(fd1);
1312 return err;
1313
1314out_release_both:
1315 sock_release(sock2);
1316out_release_1:
1317 sock_release(sock1);
1318out:
1319 return err;
1320
1321out_fd2:
1322 put_filp(newfile1);
1323 sock_release(sock1);
1324out_fd1:
1325 put_filp(newfile2);
1326 sock_release(sock2);
1327out_fd:
1328 put_unused_fd(fd1);
1329 put_unused_fd(fd2);
1330 goto out;
1331}
1332
1333/*
1334 * Bind a name to a socket. Nothing much to do here since it's
1335 * the protocol's responsibility to handle the local address.
1336 *
1337 * We move the socket address to kernel space before we call
1338 * the protocol layer (having also checked the address is ok).
1339 */
1340
1341asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
1342{
1343 struct socket *sock;
1344 char address[MAX_SOCK_ADDR];
1345 int err, fput_needed;
1346
1347 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1348 if (sock) {
1349 err = move_addr_to_kernel(umyaddr, addrlen, address);
1350 if (err >= 0) {
1351 err = security_socket_bind(sock,
1352 (struct sockaddr *)address,
1353 addrlen);
1354 if (!err)
1355 err = sock->ops->bind(sock,
1356 (struct sockaddr *)
1357 address, addrlen);
1358 }
1359 fput_light(sock->file, fput_needed);
1360 }
1361 return err;
1362}
1363
1364/*
1365 * Perform a listen. Basically, we allow the protocol to do anything
1366 * necessary for a listen, and if that works, we mark the socket as
1367 * ready for listening.
1368 */
1369
1370asmlinkage long sys_listen(int fd, int backlog)
1371{
1372 struct socket *sock;
1373 int err, fput_needed;
1374 int somaxconn;
1375
1376 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1377 if (sock) {
1378 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1379 if ((unsigned)backlog > somaxconn)
1380 backlog = somaxconn;
1381
1382 err = security_socket_listen(sock, backlog);
1383 if (!err)
1384 err = sock->ops->listen(sock, backlog);
1385
1386 fput_light(sock->file, fput_needed);
1387 }
1388 return err;
1389}
1390
1391/*
1392 * For accept, we attempt to create a new socket, set up the link
1393 * with the client, wake up the client, then return the new
1394 * connected fd. We collect the address of the connector in kernel
1395 * space and move it to user at the very end. This is unclean because
1396 * we open the socket then return an error.
1397 *
1398 * 1003.1g adds the ability to recvmsg() to query connection pending
1399 * status to recvmsg. We need to add that support in a way thats
1400 * clean when we restucture accept also.
1401 */
1402
1403asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
1404 int __user *upeer_addrlen)
1405{
1406 struct socket *sock, *newsock;
1407 struct file *newfile;
1408 int err, len, newfd, fput_needed;
1409 char address[MAX_SOCK_ADDR];
1410
1411 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1412 if (!sock)
1413 goto out;
1414
1415 err = -ENFILE;
1416 if (!(newsock = sock_alloc()))
1417 goto out_put;
1418
1419 newsock->type = sock->type;
1420 newsock->ops = sock->ops;
1421
1422 /*
1423 * We don't need try_module_get here, as the listening socket (sock)
1424 * has the protocol module (sock->ops->owner) held.
1425 */
1426 __module_get(newsock->ops->owner);
1427
1428 newfd = sock_alloc_fd(&newfile);
1429 if (unlikely(newfd < 0)) {
1430 err = newfd;
1431 sock_release(newsock);
1432 goto out_put;
1433 }
1434
1435 err = sock_attach_fd(newsock, newfile);
1436 if (err < 0)
1437 goto out_fd_simple;
1438
1439 err = security_socket_accept(sock, newsock);
1440 if (err)
1441 goto out_fd;
1442
1443 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1444 if (err < 0)
1445 goto out_fd;
1446
1447 if (upeer_sockaddr) {
1448 if (newsock->ops->getname(newsock, (struct sockaddr *)address,
1449 &len, 2) < 0) {
1450 err = -ECONNABORTED;
1451 goto out_fd;
1452 }
1453 err = move_addr_to_user(address, len, upeer_sockaddr,
1454 upeer_addrlen);
1455 if (err < 0)
1456 goto out_fd;
1457 }
1458
1459 /* File flags are not inherited via accept() unlike another OSes. */
1460
1461 fd_install(newfd, newfile);
1462 err = newfd;
1463
1464 security_socket_post_accept(sock, newsock);
1465
1466out_put:
1467 fput_light(sock->file, fput_needed);
1468out:
1469 return err;
1470out_fd_simple:
1471 sock_release(newsock);
1472 put_filp(newfile);
1473 put_unused_fd(newfd);
1474 goto out_put;
1475out_fd:
1476 fput(newfile);
1477 put_unused_fd(newfd);
1478 goto out_put;
1479}
1480
1481/*
1482 * Attempt to connect to a socket with the server address. The address
1483 * is in user space so we verify it is OK and move it to kernel space.
1484 *
1485 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1486 * break bindings
1487 *
1488 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1489 * other SEQPACKET protocols that take time to connect() as it doesn't
1490 * include the -EINPROGRESS status for such sockets.
1491 */
1492
1493asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr,
1494 int addrlen)
1495{
1496 struct socket *sock;
1497 char address[MAX_SOCK_ADDR];
1498 int err, fput_needed;
1499
1500 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1501 if (!sock)
1502 goto out;
1503 err = move_addr_to_kernel(uservaddr, addrlen, address);
1504 if (err < 0)
1505 goto out_put;
1506
1507 err =
1508 security_socket_connect(sock, (struct sockaddr *)address, addrlen);
1509 if (err)
1510 goto out_put;
1511
1512 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
1513 sock->file->f_flags);
1514out_put:
1515 fput_light(sock->file, fput_needed);
1516out:
1517 return err;
1518}
1519
1520/*
1521 * Get the local address ('name') of a socket object. Move the obtained
1522 * name to user space.
1523 */
1524
1525asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr,
1526 int __user *usockaddr_len)
1527{
1528 struct socket *sock;
1529 char address[MAX_SOCK_ADDR];
1530 int len, err, fput_needed;
1531
1532 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1533 if (!sock)
1534 goto out;
1535
1536 err = security_socket_getsockname(sock);
1537 if (err)
1538 goto out_put;
1539
1540 err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
1541 if (err)
1542 goto out_put;
1543 err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
1544
1545out_put:
1546 fput_light(sock->file, fput_needed);
1547out:
1548 return err;
1549}
1550
1551/*
1552 * Get the remote address ('name') of a socket object. Move the obtained
1553 * name to user space.
1554 */
1555
1556asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr,
1557 int __user *usockaddr_len)
1558{
1559 struct socket *sock;
1560 char address[MAX_SOCK_ADDR];
1561 int len, err, fput_needed;
1562
1563 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1564 if (sock != NULL) {
1565 err = security_socket_getpeername(sock);
1566 if (err) {
1567 fput_light(sock->file, fput_needed);
1568 return err;
1569 }
1570
1571 err =
1572 sock->ops->getname(sock, (struct sockaddr *)address, &len,
1573 1);
1574 if (!err)
1575 err = move_addr_to_user(address, len, usockaddr,
1576 usockaddr_len);
1577 fput_light(sock->file, fput_needed);
1578 }
1579 return err;
1580}
1581
1582/*
1583 * Send a datagram to a given address. We move the address into kernel
1584 * space and check the user space data area is readable before invoking
1585 * the protocol.
1586 */
1587
1588asmlinkage long sys_sendto(int fd, void __user *buff, size_t len,
1589 unsigned flags, struct sockaddr __user *addr,
1590 int addr_len)
1591{
1592 struct socket *sock;
1593 char address[MAX_SOCK_ADDR];
1594 int err;
1595 struct msghdr msg;
1596 struct iovec iov;
1597 int fput_needed;
1598
1599 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1600 if (!sock)
1601 goto out;
1602
1603 iov.iov_base = buff;
1604 iov.iov_len = len;
1605 msg.msg_name = NULL;
1606 msg.msg_iov = &iov;
1607 msg.msg_iovlen = 1;
1608 msg.msg_control = NULL;
1609 msg.msg_controllen = 0;
1610 msg.msg_namelen = 0;
1611 if (addr) {
1612 err = move_addr_to_kernel(addr, addr_len, address);
1613 if (err < 0)
1614 goto out_put;
1615 msg.msg_name = address;
1616 msg.msg_namelen = addr_len;
1617 }
1618 if (sock->file->f_flags & O_NONBLOCK)
1619 flags |= MSG_DONTWAIT;
1620 msg.msg_flags = flags;
1621 err = sock_sendmsg(sock, &msg, len);
1622
1623out_put:
1624 fput_light(sock->file, fput_needed);
1625out:
1626 return err;
1627}
1628
1629/*
1630 * Send a datagram down a socket.
1631 */
1632
1633asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags)
1634{
1635 return sys_sendto(fd, buff, len, flags, NULL, 0);
1636}
1637
1638/*
1639 * Receive a frame from the socket and optionally record the address of the
1640 * sender. We verify the buffers are writable and if needed move the
1641 * sender address from kernel to user space.
1642 */
1643
1644asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size,
1645 unsigned flags, struct sockaddr __user *addr,
1646 int __user *addr_len)
1647{
1648 struct socket *sock;
1649 struct iovec iov;
1650 struct msghdr msg;
1651 char address[MAX_SOCK_ADDR];
1652 int err, err2;
1653 int fput_needed;
1654
1655 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1656 if (!sock)
1657 goto out;
1658
1659 msg.msg_control = NULL;
1660 msg.msg_controllen = 0;
1661 msg.msg_iovlen = 1;
1662 msg.msg_iov = &iov;
1663 iov.iov_len = size;
1664 iov.iov_base = ubuf;
1665 msg.msg_name = address;
1666 msg.msg_namelen = MAX_SOCK_ADDR;
1667 if (sock->file->f_flags & O_NONBLOCK)
1668 flags |= MSG_DONTWAIT;
1669 err = sock_recvmsg(sock, &msg, size, flags);
1670
1671 if (err >= 0 && addr != NULL) {
1672 err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
1673 if (err2 < 0)
1674 err = err2;
1675 }
1676
1677 fput_light(sock->file, fput_needed);
1678out:
1679 return err;
1680}
1681
1682/*
1683 * Receive a datagram from a socket.
1684 */
1685
1686asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1687 unsigned flags)
1688{
1689 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1690}
1691
1692/*
1693 * Set a socket option. Because we don't know the option lengths we have
1694 * to pass the user mode parameter for the protocols to sort out.
1695 */
1696
1697asmlinkage long sys_setsockopt(int fd, int level, int optname,
1698 char __user *optval, int optlen)
1699{
1700 int err, fput_needed;
1701 struct socket *sock;
1702
1703 if (optlen < 0)
1704 return -EINVAL;
1705
1706 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1707 if (sock != NULL) {
1708 err = security_socket_setsockopt(sock, level, optname);
1709 if (err)
1710 goto out_put;
1711
1712 if (level == SOL_SOCKET)
1713 err =
1714 sock_setsockopt(sock, level, optname, optval,
1715 optlen);
1716 else
1717 err =
1718 sock->ops->setsockopt(sock, level, optname, optval,
1719 optlen);
1720out_put:
1721 fput_light(sock->file, fput_needed);
1722 }
1723 return err;
1724}
1725
1726/*
1727 * Get a socket option. Because we don't know the option lengths we have
1728 * to pass a user mode parameter for the protocols to sort out.
1729 */
1730
1731asmlinkage long sys_getsockopt(int fd, int level, int optname,
1732 char __user *optval, int __user *optlen)
1733{
1734 int err, fput_needed;
1735 struct socket *sock;
1736
1737 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1738 if (sock != NULL) {
1739 err = security_socket_getsockopt(sock, level, optname);
1740 if (err)
1741 goto out_put;
1742
1743 if (level == SOL_SOCKET)
1744 err =
1745 sock_getsockopt(sock, level, optname, optval,
1746 optlen);
1747 else
1748 err =
1749 sock->ops->getsockopt(sock, level, optname, optval,
1750 optlen);
1751out_put:
1752 fput_light(sock->file, fput_needed);
1753 }
1754 return err;
1755}
1756
1757/*
1758 * Shutdown a socket.
1759 */
1760
1761asmlinkage long sys_shutdown(int fd, int how)
1762{
1763 int err, fput_needed;
1764 struct socket *sock;
1765
1766 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1767 if (sock != NULL) {
1768 err = security_socket_shutdown(sock, how);
1769 if (!err)
1770 err = sock->ops->shutdown(sock, how);
1771 fput_light(sock->file, fput_needed);
1772 }
1773 return err;
1774}
1775
1776/* A couple of helpful macros for getting the address of the 32/64 bit
1777 * fields which are the same type (int / unsigned) on our platforms.
1778 */
1779#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1780#define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1781#define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1782
1783/*
1784 * BSD sendmsg interface
1785 */
1786
1787asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
1788{
1789 struct compat_msghdr __user *msg_compat =
1790 (struct compat_msghdr __user *)msg;
1791 struct socket *sock;
1792 char address[MAX_SOCK_ADDR];
1793 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1794 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1795 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1796 /* 20 is size of ipv6_pktinfo */
1797 unsigned char *ctl_buf = ctl;
1798 struct msghdr msg_sys;
1799 int err, ctl_len, iov_size, total_len;
1800 int fput_needed;
1801
1802 err = -EFAULT;
1803 if (MSG_CMSG_COMPAT & flags) {
1804 if (get_compat_msghdr(&msg_sys, msg_compat))
1805 return -EFAULT;
1806 }
1807 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1808 return -EFAULT;
1809
1810 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1811 if (!sock)
1812 goto out;
1813
1814 /* do not move before msg_sys is valid */
1815 err = -EMSGSIZE;
1816 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1817 goto out_put;
1818
1819 /* Check whether to allocate the iovec area */
1820 err = -ENOMEM;
1821 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1822 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1823 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1824 if (!iov)
1825 goto out_put;
1826 }
1827
1828 /* This will also move the address data into kernel space */
1829 if (MSG_CMSG_COMPAT & flags) {
1830 err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
1831 } else
1832 err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
1833 if (err < 0)
1834 goto out_freeiov;
1835 total_len = err;
1836
1837 err = -ENOBUFS;
1838
1839 if (msg_sys.msg_controllen > INT_MAX)
1840 goto out_freeiov;
1841 ctl_len = msg_sys.msg_controllen;
1842 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1843 err =
1844 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl,
1845 sizeof(ctl));
1846 if (err)
1847 goto out_freeiov;
1848 ctl_buf = msg_sys.msg_control;
1849 ctl_len = msg_sys.msg_controllen;
1850 } else if (ctl_len) {
1851 if (ctl_len > sizeof(ctl)) {
1852 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1853 if (ctl_buf == NULL)
1854 goto out_freeiov;
1855 }
1856 err = -EFAULT;
1857 /*
1858 * Careful! Before this, msg_sys.msg_control contains a user pointer.
1859 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1860 * checking falls down on this.
1861 */
1862 if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
1863 ctl_len))
1864 goto out_freectl;
1865 msg_sys.msg_control = ctl_buf;
1866 }
1867 msg_sys.msg_flags = flags;
1868
1869 if (sock->file->f_flags & O_NONBLOCK)
1870 msg_sys.msg_flags |= MSG_DONTWAIT;
1871 err = sock_sendmsg(sock, &msg_sys, total_len);
1872
1873out_freectl:
1874 if (ctl_buf != ctl)
1875 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1876out_freeiov:
1877 if (iov != iovstack)
1878 sock_kfree_s(sock->sk, iov, iov_size);
1879out_put:
1880 fput_light(sock->file, fput_needed);
1881out:
1882 return err;
1883}
1884
1885/*
1886 * BSD recvmsg interface
1887 */
1888
1889asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
1890 unsigned int flags)
1891{
1892 struct compat_msghdr __user *msg_compat =
1893 (struct compat_msghdr __user *)msg;
1894 struct socket *sock;
1895 struct iovec iovstack[UIO_FASTIOV];
1896 struct iovec *iov = iovstack;
1897 struct msghdr msg_sys;
1898 unsigned long cmsg_ptr;
1899 int err, iov_size, total_len, len;
1900 int fput_needed;
1901
1902 /* kernel mode address */
1903 char addr[MAX_SOCK_ADDR];
1904
1905 /* user mode address pointers */
1906 struct sockaddr __user *uaddr;
1907 int __user *uaddr_len;
1908
1909 if (MSG_CMSG_COMPAT & flags) {
1910 if (get_compat_msghdr(&msg_sys, msg_compat))
1911 return -EFAULT;
1912 }
1913 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
1914 return -EFAULT;
1915
1916 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1917 if (!sock)
1918 goto out;
1919
1920 err = -EMSGSIZE;
1921 if (msg_sys.msg_iovlen > UIO_MAXIOV)
1922 goto out_put;
1923
1924 /* Check whether to allocate the iovec area */
1925 err = -ENOMEM;
1926 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
1927 if (msg_sys.msg_iovlen > UIO_FASTIOV) {
1928 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1929 if (!iov)
1930 goto out_put;
1931 }
1932
1933 /*
1934 * Save the user-mode address (verify_iovec will change the
1935 * kernel msghdr to use the kernel address space)
1936 */
1937
1938 uaddr = (__force void __user *)msg_sys.msg_name;
1939 uaddr_len = COMPAT_NAMELEN(msg);
1940 if (MSG_CMSG_COMPAT & flags) {
1941 err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1942 } else
1943 err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
1944 if (err < 0)
1945 goto out_freeiov;
1946 total_len = err;
1947
1948 cmsg_ptr = (unsigned long)msg_sys.msg_control;
1949 msg_sys.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
1950
1951 if (sock->file->f_flags & O_NONBLOCK)
1952 flags |= MSG_DONTWAIT;
1953 err = sock_recvmsg(sock, &msg_sys, total_len, flags);
1954 if (err < 0)
1955 goto out_freeiov;
1956 len = err;
1957
1958 if (uaddr != NULL) {
1959 err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr,
1960 uaddr_len);
1961 if (err < 0)
1962 goto out_freeiov;
1963 }
1964 err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT),
1965 COMPAT_FLAGS(msg));
1966 if (err)
1967 goto out_freeiov;
1968 if (MSG_CMSG_COMPAT & flags)
1969 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
1970 &msg_compat->msg_controllen);
1971 else
1972 err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr,
1973 &msg->msg_controllen);
1974 if (err)
1975 goto out_freeiov;
1976 err = len;
1977
1978out_freeiov:
1979 if (iov != iovstack)
1980 sock_kfree_s(sock->sk, iov, iov_size);
1981out_put:
1982 fput_light(sock->file, fput_needed);
1983out:
1984 return err;
1985}
1986
1987#ifdef __ARCH_WANT_SYS_SOCKETCALL
1988
1989/* Argument list sizes for sys_socketcall */
1990#define AL(x) ((x) * sizeof(unsigned long))
1991static const unsigned char nargs[18]={
1992 AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1993 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
1994 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)
1995};
1996
1997#undef AL
1998
1999/*
2000 * System call vectors.
2001 *
2002 * Argument checking cleaned up. Saved 20% in size.
2003 * This function doesn't need to set the kernel lock because
2004 * it is set by the callees.
2005 */
2006
2007asmlinkage long sys_socketcall(int call, unsigned long __user *args)
2008{
2009 unsigned long a[6];
2010 unsigned long a0, a1;
2011 int err;
2012
2013 if (call < 1 || call > SYS_RECVMSG)
2014 return -EINVAL;
2015
2016 /* copy_from_user should be SMP safe. */
2017 if (copy_from_user(a, args, nargs[call]))
2018 return -EFAULT;
2019
2020 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2021 if (err)
2022 return err;
2023
2024 a0 = a[0];
2025 a1 = a[1];
2026
2027 switch (call) {
2028 case SYS_SOCKET:
2029 err = sys_socket(a0, a1, a[2]);
2030 break;
2031 case SYS_BIND:
2032 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2033 break;
2034 case SYS_CONNECT:
2035 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2036 break;
2037 case SYS_LISTEN:
2038 err = sys_listen(a0, a1);
2039 break;
2040 case SYS_ACCEPT:
2041 err =
2042 sys_accept(a0, (struct sockaddr __user *)a1,
2043 (int __user *)a[2]);
2044 break;
2045 case SYS_GETSOCKNAME:
2046 err =
2047 sys_getsockname(a0, (struct sockaddr __user *)a1,
2048 (int __user *)a[2]);
2049 break;
2050 case SYS_GETPEERNAME:
2051 err =
2052 sys_getpeername(a0, (struct sockaddr __user *)a1,
2053 (int __user *)a[2]);
2054 break;
2055 case SYS_SOCKETPAIR:
2056 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2057 break;
2058 case SYS_SEND:
2059 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2060 break;
2061 case SYS_SENDTO:
2062 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2063 (struct sockaddr __user *)a[4], a[5]);
2064 break;
2065 case SYS_RECV:
2066 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2067 break;
2068 case SYS_RECVFROM:
2069 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2070 (struct sockaddr __user *)a[4],
2071 (int __user *)a[5]);
2072 break;
2073 case SYS_SHUTDOWN:
2074 err = sys_shutdown(a0, a1);
2075 break;
2076 case SYS_SETSOCKOPT:
2077 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2078 break;
2079 case SYS_GETSOCKOPT:
2080 err =
2081 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2082 (int __user *)a[4]);
2083 break;
2084 case SYS_SENDMSG:
2085 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2086 break;
2087 case SYS_RECVMSG:
2088 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2089 break;
2090 default:
2091 err = -EINVAL;
2092 break;
2093 }
2094 return err;
2095}
2096
2097#endif /* __ARCH_WANT_SYS_SOCKETCALL */
2098
2099/**
2100 * sock_register - add a socket protocol handler
2101 * @ops: description of protocol
2102 *
2103 * This function is called by a protocol handler that wants to
2104 * advertise its address family, and have it linked into the
2105 * socket interface. The value ops->family coresponds to the
2106 * socket system call protocol family.
2107 */
2108int sock_register(const struct net_proto_family *ops)
2109{
2110 int err;
2111
2112 if (ops->family >= NPROTO) {
2113 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2114 NPROTO);
2115 return -ENOBUFS;
2116 }
2117
2118 spin_lock(&net_family_lock);
2119 if (net_families[ops->family])
2120 err = -EEXIST;
2121 else {
2122 net_families[ops->family] = ops;
2123 err = 0;
2124 }
2125 spin_unlock(&net_family_lock);
2126
2127 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
2128 return err;
2129}
2130
2131/**
2132 * sock_unregister - remove a protocol handler
2133 * @family: protocol family to remove
2134 *
2135 * This function is called by a protocol handler that wants to
2136 * remove its address family, and have it unlinked from the
2137 * new socket creation.
2138 *
2139 * If protocol handler is a module, then it can use module reference
2140 * counts to protect against new references. If protocol handler is not
2141 * a module then it needs to provide its own protection in
2142 * the ops->create routine.
2143 */
2144void sock_unregister(int family)
2145{
2146 BUG_ON(family < 0 || family >= NPROTO);
2147
2148 spin_lock(&net_family_lock);
2149 net_families[family] = NULL;
2150 spin_unlock(&net_family_lock);
2151
2152 synchronize_rcu();
2153
2154 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
2155}
2156
2157static int __init sock_init(void)
2158{
2159 /*
2160 * Initialize sock SLAB cache.
2161 */
2162
2163 sk_init();
2164
2165 /*
2166 * Initialize skbuff SLAB cache
2167 */
2168 skb_init();
2169
2170 /*
2171 * Initialize the protocols module.
2172 */
2173
2174 init_inodecache();
2175 register_filesystem(&sock_fs_type);
2176 sock_mnt = kern_mount(&sock_fs_type);
2177
2178 /* The real protocol initialization is performed in later initcalls.
2179 */
2180
2181#ifdef CONFIG_NETFILTER
2182 netfilter_init();
2183#endif
2184
2185 return 0;
2186}
2187
2188core_initcall(sock_init); /* early initcall */
2189
2190#ifdef CONFIG_PROC_FS
2191void socket_seq_show(struct seq_file *seq)
2192{
2193 int cpu;
2194 int counter = 0;
2195
2196 for_each_possible_cpu(cpu)
2197 counter += per_cpu(sockets_in_use, cpu);
2198
2199 /* It can be negative, by the way. 8) */
2200 if (counter < 0)
2201 counter = 0;
2202
2203 seq_printf(seq, "sockets: used %d\n", counter);
2204}
2205#endif /* CONFIG_PROC_FS */
2206
2207#ifdef CONFIG_COMPAT
2208static long compat_sock_ioctl(struct file *file, unsigned cmd,
2209 unsigned long arg)
2210{
2211 struct socket *sock = file->private_data;
2212 int ret = -ENOIOCTLCMD;
2213
2214 if (sock->ops->compat_ioctl)
2215 ret = sock->ops->compat_ioctl(sock, cmd, arg);
2216
2217 return ret;
2218}
2219#endif
2220
2221int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
2222{
2223 return sock->ops->bind(sock, addr, addrlen);
2224}
2225
2226int kernel_listen(struct socket *sock, int backlog)
2227{
2228 return sock->ops->listen(sock, backlog);
2229}
2230
2231int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
2232{
2233 struct sock *sk = sock->sk;
2234 int err;
2235
2236 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
2237 newsock);
2238 if (err < 0)
2239 goto done;
2240
2241 err = sock->ops->accept(sock, *newsock, flags);
2242 if (err < 0) {
2243 sock_release(*newsock);
2244 *newsock = NULL;
2245 goto done;
2246 }
2247
2248 (*newsock)->ops = sock->ops;
2249
2250done:
2251 return err;
2252}
2253
2254int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
2255 int flags)
2256{
2257 return sock->ops->connect(sock, addr, addrlen, flags);
2258}
2259
2260int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
2261 int *addrlen)
2262{
2263 return sock->ops->getname(sock, addr, addrlen, 0);
2264}
2265
2266int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
2267 int *addrlen)
2268{
2269 return sock->ops->getname(sock, addr, addrlen, 1);
2270}
2271
2272int kernel_getsockopt(struct socket *sock, int level, int optname,
2273 char *optval, int *optlen)
2274{
2275 mm_segment_t oldfs = get_fs();
2276 int err;
2277
2278 set_fs(KERNEL_DS);
2279 if (level == SOL_SOCKET)
2280 err = sock_getsockopt(sock, level, optname, optval, optlen);
2281 else
2282 err = sock->ops->getsockopt(sock, level, optname, optval,
2283 optlen);
2284 set_fs(oldfs);
2285 return err;
2286}
2287
2288int kernel_setsockopt(struct socket *sock, int level, int optname,
2289 char *optval, int optlen)
2290{
2291 mm_segment_t oldfs = get_fs();
2292 int err;
2293
2294 set_fs(KERNEL_DS);
2295 if (level == SOL_SOCKET)
2296 err = sock_setsockopt(sock, level, optname, optval, optlen);
2297 else
2298 err = sock->ops->setsockopt(sock, level, optname, optval,
2299 optlen);
2300 set_fs(oldfs);
2301 return err;
2302}
2303
2304int kernel_sendpage(struct socket *sock, struct page *page, int offset,
2305 size_t size, int flags)
2306{
2307 if (sock->ops->sendpage)
2308 return sock->ops->sendpage(sock, page, offset, size, flags);
2309
2310 return sock_no_sendpage(sock, page, offset, size, flags);
2311}
2312
2313int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
2314{
2315 mm_segment_t oldfs = get_fs();
2316 int err;
2317
2318 set_fs(KERNEL_DS);
2319 err = sock->ops->ioctl(sock, cmd, arg);
2320 set_fs(oldfs);
2321
2322 return err;
2323}
2324
2325int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
2326{
2327 return sock->ops->shutdown(sock, how);
2328}
2329
2330EXPORT_SYMBOL(sock_create);
2331EXPORT_SYMBOL(sock_create_kern);
2332EXPORT_SYMBOL(sock_create_lite);
2333EXPORT_SYMBOL(sock_map_fd);
2334EXPORT_SYMBOL(sock_recvmsg);
2335EXPORT_SYMBOL(sock_register);
2336EXPORT_SYMBOL(sock_release);
2337EXPORT_SYMBOL(sock_sendmsg);
2338EXPORT_SYMBOL(sock_unregister);
2339EXPORT_SYMBOL(sock_wake_async);
2340EXPORT_SYMBOL(sockfd_lookup);
2341EXPORT_SYMBOL(kernel_sendmsg);
2342EXPORT_SYMBOL(kernel_recvmsg);
2343EXPORT_SYMBOL(kernel_bind);
2344EXPORT_SYMBOL(kernel_listen);
2345EXPORT_SYMBOL(kernel_accept);
2346EXPORT_SYMBOL(kernel_connect);
2347EXPORT_SYMBOL(kernel_getsockname);
2348EXPORT_SYMBOL(kernel_getpeername);
2349EXPORT_SYMBOL(kernel_getsockopt);
2350EXPORT_SYMBOL(kernel_setsockopt);
2351EXPORT_SYMBOL(kernel_sendpage);
2352EXPORT_SYMBOL(kernel_sock_ioctl);
2353EXPORT_SYMBOL(kernel_sock_shutdown);