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[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / socket.c
blob02dc82db3d232c79173d271370f7ff2bd68f5dc7
1 /*
2 * NET An implementation of the SOCKET network access protocol.
4 * Version: @(#)socket.c 1.1.93 18/02/95
6 * Authors: Orest Zborowski, <obz@Kodak.COM>
7 * Ross Biro
8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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
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.
55 * This module is effectively the top level interface to the BSD socket
56 * paradigm.
58 * Based upon Swansea University Computer Society NET3.039
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/thread_info.h>
67 #include <linux/rcupdate.h>
68 #include <linux/netdevice.h>
69 #include <linux/proc_fs.h>
70 #include <linux/seq_file.h>
71 #include <linux/mutex.h>
72 #include <linux/wanrouter.h>
73 #include <linux/if_bridge.h>
74 #include <linux/if_frad.h>
75 #include <linux/if_vlan.h>
76 #include <linux/init.h>
77 #include <linux/poll.h>
78 #include <linux/cache.h>
79 #include <linux/module.h>
80 #include <linux/highmem.h>
81 #include <linux/mount.h>
82 #include <linux/security.h>
83 #include <linux/syscalls.h>
84 #include <linux/compat.h>
85 #include <linux/kmod.h>
86 #include <linux/audit.h>
87 #include <linux/wireless.h>
88 #include <linux/nsproxy.h>
89 #include <linux/magic.h>
90 #include <linux/slab.h>
92 #include <asm/uaccess.h>
93 #include <asm/unistd.h>
95 #include <net/compat.h>
96 #include <net/wext.h>
97 #include <net/cls_cgroup.h>
99 #include <net/sock.h>
100 #include <linux/netfilter.h>
102 #include <linux/if_tun.h>
103 #include <linux/ipv6_route.h>
104 #include <linux/route.h>
105 #include <linux/sockios.h>
106 #include <linux/atalk.h>
108 static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
109 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
110 unsigned long nr_segs, loff_t pos);
111 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
112 unsigned long nr_segs, loff_t pos);
113 static int sock_mmap(struct file *file, struct vm_area_struct *vma);
115 static int sock_close(struct inode *inode, struct file *file);
116 static unsigned int sock_poll(struct file *file,
117 struct poll_table_struct *wait);
118 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
119 #ifdef CONFIG_COMPAT
120 static long compat_sock_ioctl(struct file *file,
121 unsigned int cmd, unsigned long arg);
122 #endif
123 static int sock_fasync(int fd, struct file *filp, int on);
124 static ssize_t sock_sendpage(struct file *file, struct page *page,
125 int offset, size_t size, loff_t *ppos, int more);
126 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
127 struct pipe_inode_info *pipe, size_t len,
128 unsigned int flags);
131 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
132 * in the operation structures but are done directly via the socketcall() multiplexor.
135 static const struct file_operations socket_file_ops = {
136 .owner = THIS_MODULE,
137 .llseek = no_llseek,
138 .aio_read = sock_aio_read,
139 .aio_write = sock_aio_write,
140 .poll = sock_poll,
141 .unlocked_ioctl = sock_ioctl,
142 #ifdef CONFIG_COMPAT
143 .compat_ioctl = compat_sock_ioctl,
144 #endif
145 .mmap = sock_mmap,
146 .open = sock_no_open, /* special open code to disallow open via /proc */
147 .release = sock_close,
148 .fasync = sock_fasync,
149 .sendpage = sock_sendpage,
150 .splice_write = generic_splice_sendpage,
151 .splice_read = sock_splice_read,
155 * The protocol list. Each protocol is registered in here.
158 static DEFINE_SPINLOCK(net_family_lock);
159 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
162 * Statistics counters of the socket lists
165 static DEFINE_PER_CPU(int, sockets_in_use);
168 * Support routines.
169 * Move socket addresses back and forth across the kernel/user
170 * divide and look after the messy bits.
174 * move_addr_to_kernel - copy a socket address into kernel space
175 * @uaddr: Address in user space
176 * @kaddr: Address in kernel space
177 * @ulen: Length in user space
179 * The address is copied into kernel space. If the provided address is
180 * too long an error code of -EINVAL is returned. If the copy gives
181 * invalid addresses -EFAULT is returned. On a success 0 is returned.
184 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
186 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
187 return -EINVAL;
188 if (ulen == 0)
189 return 0;
190 if (copy_from_user(kaddr, uaddr, ulen))
191 return -EFAULT;
192 return audit_sockaddr(ulen, kaddr);
196 * move_addr_to_user - copy an address to user space
197 * @kaddr: kernel space address
198 * @klen: length of address in kernel
199 * @uaddr: user space address
200 * @ulen: pointer to user length field
202 * The value pointed to by ulen on entry is the buffer length available.
203 * This is overwritten with the buffer space used. -EINVAL is returned
204 * if an overlong buffer is specified or a negative buffer size. -EFAULT
205 * is returned if either the buffer or the length field are not
206 * accessible.
207 * After copying the data up to the limit the user specifies, the true
208 * length of the data is written over the length limit the user
209 * specified. Zero is returned for a success.
212 static int move_addr_to_user(struct sockaddr *kaddr, int klen,
213 void __user *uaddr, int __user *ulen)
215 int err;
216 int len;
218 err = get_user(len, ulen);
219 if (err)
220 return err;
221 if (len > klen)
222 len = klen;
223 if (len < 0 || len > sizeof(struct sockaddr_storage))
224 return -EINVAL;
225 if (len) {
226 if (audit_sockaddr(klen, kaddr))
227 return -ENOMEM;
228 if (copy_to_user(uaddr, kaddr, len))
229 return -EFAULT;
232 * "fromlen shall refer to the value before truncation.."
233 * 1003.1g
235 return __put_user(klen, ulen);
238 static struct kmem_cache *sock_inode_cachep __read_mostly;
240 static struct inode *sock_alloc_inode(struct super_block *sb)
242 struct socket_alloc *ei;
243 struct socket_wq *wq;
245 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
246 if (!ei)
247 return NULL;
248 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
249 if (!wq) {
250 kmem_cache_free(sock_inode_cachep, ei);
251 return NULL;
253 init_waitqueue_head(&wq->wait);
254 wq->fasync_list = NULL;
255 RCU_INIT_POINTER(ei->socket.wq, wq);
257 ei->socket.state = SS_UNCONNECTED;
258 ei->socket.flags = 0;
259 ei->socket.ops = NULL;
260 ei->socket.sk = NULL;
261 ei->socket.file = NULL;
263 return &ei->vfs_inode;
266 static void sock_destroy_inode(struct inode *inode)
268 struct socket_alloc *ei;
269 struct socket_wq *wq;
271 ei = container_of(inode, struct socket_alloc, vfs_inode);
272 wq = rcu_dereference_protected(ei->socket.wq, 1);
273 kfree_rcu(wq, rcu);
274 kmem_cache_free(sock_inode_cachep, ei);
277 static void init_once(void *foo)
279 struct socket_alloc *ei = (struct socket_alloc *)foo;
281 inode_init_once(&ei->vfs_inode);
284 static int init_inodecache(void)
286 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
287 sizeof(struct socket_alloc),
289 (SLAB_HWCACHE_ALIGN |
290 SLAB_RECLAIM_ACCOUNT |
291 SLAB_MEM_SPREAD),
292 init_once);
293 if (sock_inode_cachep == NULL)
294 return -ENOMEM;
295 return 0;
298 static const struct super_operations sockfs_ops = {
299 .alloc_inode = sock_alloc_inode,
300 .destroy_inode = sock_destroy_inode,
301 .statfs = simple_statfs,
305 * sockfs_dname() is called from d_path().
307 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
309 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
310 dentry->d_inode->i_ino);
313 static const struct dentry_operations sockfs_dentry_operations = {
314 .d_dname = sockfs_dname,
317 static struct dentry *sockfs_mount(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *data)
320 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
321 &sockfs_dentry_operations, SOCKFS_MAGIC);
324 static struct vfsmount *sock_mnt __read_mostly;
326 static struct file_system_type sock_fs_type = {
327 .name = "sockfs",
328 .mount = sockfs_mount,
329 .kill_sb = kill_anon_super,
333 * Obtains the first available file descriptor and sets it up for use.
335 * These functions create file structures and maps them to fd space
336 * of the current process. On success it returns file descriptor
337 * and file struct implicitly stored in sock->file.
338 * Note that another thread may close file descriptor before we return
339 * from this function. We use the fact that now we do not refer
340 * to socket after mapping. If one day we will need it, this
341 * function will increment ref. count on file by 1.
343 * In any case returned fd MAY BE not valid!
344 * This race condition is unavoidable
345 * with shared fd spaces, we cannot solve it inside kernel,
346 * but we take care of internal coherence yet.
349 static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
351 struct qstr name = { .name = "" };
352 struct path path;
353 struct file *file;
354 int fd;
356 fd = get_unused_fd_flags(flags);
357 if (unlikely(fd < 0))
358 return fd;
360 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
361 if (unlikely(!path.dentry)) {
362 put_unused_fd(fd);
363 return -ENOMEM;
365 path.mnt = mntget(sock_mnt);
367 d_instantiate(path.dentry, SOCK_INODE(sock));
368 SOCK_INODE(sock)->i_fop = &socket_file_ops;
370 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
371 &socket_file_ops);
372 if (unlikely(!file)) {
373 /* drop dentry, keep inode */
374 ihold(path.dentry->d_inode);
375 path_put(&path);
376 put_unused_fd(fd);
377 return -ENFILE;
380 sock->file = file;
381 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
382 file->f_pos = 0;
383 file->private_data = sock;
385 *f = file;
386 return fd;
389 int sock_map_fd(struct socket *sock, int flags)
391 struct file *newfile;
392 int fd = sock_alloc_file(sock, &newfile, flags);
394 if (likely(fd >= 0))
395 fd_install(fd, newfile);
397 return fd;
399 EXPORT_SYMBOL(sock_map_fd);
401 static struct socket *sock_from_file(struct file *file, int *err)
403 if (file->f_op == &socket_file_ops)
404 return file->private_data; /* set in sock_map_fd */
406 *err = -ENOTSOCK;
407 return NULL;
411 * sockfd_lookup - Go from a file number to its socket slot
412 * @fd: file handle
413 * @err: pointer to an error code return
415 * The file handle passed in is locked and the socket it is bound
416 * too is returned. If an error occurs the err pointer is overwritten
417 * with a negative errno code and NULL is returned. The function checks
418 * for both invalid handles and passing a handle which is not a socket.
420 * On a success the socket object pointer is returned.
423 struct socket *sockfd_lookup(int fd, int *err)
425 struct file *file;
426 struct socket *sock;
428 file = fget(fd);
429 if (!file) {
430 *err = -EBADF;
431 return NULL;
434 sock = sock_from_file(file, err);
435 if (!sock)
436 fput(file);
437 return sock;
439 EXPORT_SYMBOL(sockfd_lookup);
441 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
443 struct file *file;
444 struct socket *sock;
446 *err = -EBADF;
447 file = fget_light(fd, fput_needed);
448 if (file) {
449 sock = sock_from_file(file, err);
450 if (sock)
451 return sock;
452 fput_light(file, *fput_needed);
454 return NULL;
458 * sock_alloc - allocate a socket
460 * Allocate a new inode and socket object. The two are bound together
461 * and initialised. The socket is then returned. If we are out of inodes
462 * NULL is returned.
465 static struct socket *sock_alloc(void)
467 struct inode *inode;
468 struct socket *sock;
470 inode = new_inode(sock_mnt->mnt_sb);
471 if (!inode)
472 return NULL;
474 sock = SOCKET_I(inode);
476 kmemcheck_annotate_bitfield(sock, type);
477 inode->i_ino = get_next_ino();
478 inode->i_mode = S_IFSOCK | S_IRWXUGO;
479 inode->i_uid = current_fsuid();
480 inode->i_gid = current_fsgid();
482 percpu_add(sockets_in_use, 1);
483 return sock;
487 * In theory you can't get an open on this inode, but /proc provides
488 * a back door. Remember to keep it shut otherwise you'll let the
489 * creepy crawlies in.
492 static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
494 return -ENXIO;
497 const struct file_operations bad_sock_fops = {
498 .owner = THIS_MODULE,
499 .open = sock_no_open,
500 .llseek = noop_llseek,
504 * sock_release - close a socket
505 * @sock: socket to close
507 * The socket is released from the protocol stack if it has a release
508 * callback, and the inode is then released if the socket is bound to
509 * an inode not a file.
512 void sock_release(struct socket *sock)
514 if (sock->ops) {
515 struct module *owner = sock->ops->owner;
517 sock->ops->release(sock);
518 sock->ops = NULL;
519 module_put(owner);
522 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
523 printk(KERN_ERR "sock_release: fasync list not empty!\n");
525 percpu_sub(sockets_in_use, 1);
526 if (!sock->file) {
527 iput(SOCK_INODE(sock));
528 return;
530 sock->file = NULL;
532 EXPORT_SYMBOL(sock_release);
534 int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
536 *tx_flags = 0;
537 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
538 *tx_flags |= SKBTX_HW_TSTAMP;
539 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
540 *tx_flags |= SKBTX_SW_TSTAMP;
541 return 0;
543 EXPORT_SYMBOL(sock_tx_timestamp);
545 static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
546 struct msghdr *msg, size_t size)
548 struct sock_iocb *si = kiocb_to_siocb(iocb);
550 sock_update_classid(sock->sk);
552 si->sock = sock;
553 si->scm = NULL;
554 si->msg = msg;
555 si->size = size;
557 return sock->ops->sendmsg(iocb, sock, msg, size);
560 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
561 struct msghdr *msg, size_t size)
563 int err = security_socket_sendmsg(sock, msg, size);
565 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
568 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
570 struct kiocb iocb;
571 struct sock_iocb siocb;
572 int ret;
574 init_sync_kiocb(&iocb, NULL);
575 iocb.private = &siocb;
576 ret = __sock_sendmsg(&iocb, sock, msg, size);
577 if (-EIOCBQUEUED == ret)
578 ret = wait_on_sync_kiocb(&iocb);
579 return ret;
581 EXPORT_SYMBOL(sock_sendmsg);
583 int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
585 struct kiocb iocb;
586 struct sock_iocb siocb;
587 int ret;
589 init_sync_kiocb(&iocb, NULL);
590 iocb.private = &siocb;
591 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
592 if (-EIOCBQUEUED == ret)
593 ret = wait_on_sync_kiocb(&iocb);
594 return ret;
597 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
598 struct kvec *vec, size_t num, size_t size)
600 mm_segment_t oldfs = get_fs();
601 int result;
603 set_fs(KERNEL_DS);
605 * the following is safe, since for compiler definitions of kvec and
606 * iovec are identical, yielding the same in-core layout and alignment
608 msg->msg_iov = (struct iovec *)vec;
609 msg->msg_iovlen = num;
610 result = sock_sendmsg(sock, msg, size);
611 set_fs(oldfs);
612 return result;
614 EXPORT_SYMBOL(kernel_sendmsg);
616 static int ktime2ts(ktime_t kt, struct timespec *ts)
618 if (kt.tv64) {
619 *ts = ktime_to_timespec(kt);
620 return 1;
621 } else {
622 return 0;
627 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
629 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
630 struct sk_buff *skb)
632 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
633 struct timespec ts[3];
634 int empty = 1;
635 struct skb_shared_hwtstamps *shhwtstamps =
636 skb_hwtstamps(skb);
638 /* Race occurred between timestamp enabling and packet
639 receiving. Fill in the current time for now. */
640 if (need_software_tstamp && skb->tstamp.tv64 == 0)
641 __net_timestamp(skb);
643 if (need_software_tstamp) {
644 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
645 struct timeval tv;
646 skb_get_timestamp(skb, &tv);
647 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
648 sizeof(tv), &tv);
649 } else {
650 skb_get_timestampns(skb, &ts[0]);
651 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
652 sizeof(ts[0]), &ts[0]);
657 memset(ts, 0, sizeof(ts));
658 if (skb->tstamp.tv64 &&
659 sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
660 skb_get_timestampns(skb, ts + 0);
661 empty = 0;
663 if (shhwtstamps) {
664 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
665 ktime2ts(shhwtstamps->syststamp, ts + 1))
666 empty = 0;
667 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
668 ktime2ts(shhwtstamps->hwtstamp, ts + 2))
669 empty = 0;
671 if (!empty)
672 put_cmsg(msg, SOL_SOCKET,
673 SCM_TIMESTAMPING, sizeof(ts), &ts);
675 EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
677 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
678 struct sk_buff *skb)
680 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
681 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
682 sizeof(__u32), &skb->dropcount);
685 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
686 struct sk_buff *skb)
688 sock_recv_timestamp(msg, sk, skb);
689 sock_recv_drops(msg, sk, skb);
691 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
693 static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
694 struct msghdr *msg, size_t size, int flags)
696 struct sock_iocb *si = kiocb_to_siocb(iocb);
698 sock_update_classid(sock->sk);
700 si->sock = sock;
701 si->scm = NULL;
702 si->msg = msg;
703 si->size = size;
704 si->flags = flags;
706 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
709 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
710 struct msghdr *msg, size_t size, int flags)
712 int err = security_socket_recvmsg(sock, msg, size, flags);
714 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
717 int sock_recvmsg(struct socket *sock, struct msghdr *msg,
718 size_t size, int flags)
720 struct kiocb iocb;
721 struct sock_iocb siocb;
722 int ret;
724 init_sync_kiocb(&iocb, NULL);
725 iocb.private = &siocb;
726 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
727 if (-EIOCBQUEUED == ret)
728 ret = wait_on_sync_kiocb(&iocb);
729 return ret;
731 EXPORT_SYMBOL(sock_recvmsg);
733 static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
734 size_t size, int flags)
736 struct kiocb iocb;
737 struct sock_iocb siocb;
738 int ret;
740 init_sync_kiocb(&iocb, NULL);
741 iocb.private = &siocb;
742 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
743 if (-EIOCBQUEUED == ret)
744 ret = wait_on_sync_kiocb(&iocb);
745 return ret;
749 * kernel_recvmsg - Receive a message from a socket (kernel space)
750 * @sock: The socket to receive the message from
751 * @msg: Received message
752 * @vec: Input s/g array for message data
753 * @num: Size of input s/g array
754 * @size: Number of bytes to read
755 * @flags: Message flags (MSG_DONTWAIT, etc...)
757 * On return the msg structure contains the scatter/gather array passed in the
758 * vec argument. The array is modified so that it consists of the unfilled
759 * portion of the original array.
761 * The returned value is the total number of bytes received, or an error.
763 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
764 struct kvec *vec, size_t num, size_t size, int flags)
766 mm_segment_t oldfs = get_fs();
767 int result;
769 set_fs(KERNEL_DS);
771 * the following is safe, since for compiler definitions of kvec and
772 * iovec are identical, yielding the same in-core layout and alignment
774 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
775 result = sock_recvmsg(sock, msg, size, flags);
776 set_fs(oldfs);
777 return result;
779 EXPORT_SYMBOL(kernel_recvmsg);
781 static void sock_aio_dtor(struct kiocb *iocb)
783 kfree(iocb->private);
786 static ssize_t sock_sendpage(struct file *file, struct page *page,
787 int offset, size_t size, loff_t *ppos, int more)
789 struct socket *sock;
790 int flags;
792 sock = file->private_data;
794 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
795 if (more)
796 flags |= MSG_MORE;
798 return kernel_sendpage(sock, page, offset, size, flags);
801 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
802 struct pipe_inode_info *pipe, size_t len,
803 unsigned int flags)
805 struct socket *sock = file->private_data;
807 if (unlikely(!sock->ops->splice_read))
808 return -EINVAL;
810 sock_update_classid(sock->sk);
812 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
815 static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
816 struct sock_iocb *siocb)
818 if (!is_sync_kiocb(iocb)) {
819 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
820 if (!siocb)
821 return NULL;
822 iocb->ki_dtor = sock_aio_dtor;
825 siocb->kiocb = iocb;
826 iocb->private = siocb;
827 return siocb;
830 static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
831 struct file *file, const struct iovec *iov,
832 unsigned long nr_segs)
834 struct socket *sock = file->private_data;
835 size_t size = 0;
836 int i;
838 for (i = 0; i < nr_segs; i++)
839 size += iov[i].iov_len;
841 msg->msg_name = NULL;
842 msg->msg_namelen = 0;
843 msg->msg_control = NULL;
844 msg->msg_controllen = 0;
845 msg->msg_iov = (struct iovec *)iov;
846 msg->msg_iovlen = nr_segs;
847 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
849 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
852 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
853 unsigned long nr_segs, loff_t pos)
855 struct sock_iocb siocb, *x;
857 if (pos != 0)
858 return -ESPIPE;
860 if (iocb->ki_left == 0) /* Match SYS5 behaviour */
861 return 0;
864 x = alloc_sock_iocb(iocb, &siocb);
865 if (!x)
866 return -ENOMEM;
867 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
870 static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
871 struct file *file, const struct iovec *iov,
872 unsigned long nr_segs)
874 struct socket *sock = file->private_data;
875 size_t size = 0;
876 int i;
878 for (i = 0; i < nr_segs; i++)
879 size += iov[i].iov_len;
881 msg->msg_name = NULL;
882 msg->msg_namelen = 0;
883 msg->msg_control = NULL;
884 msg->msg_controllen = 0;
885 msg->msg_iov = (struct iovec *)iov;
886 msg->msg_iovlen = nr_segs;
887 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
888 if (sock->type == SOCK_SEQPACKET)
889 msg->msg_flags |= MSG_EOR;
891 return __sock_sendmsg(iocb, sock, msg, size);
894 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
895 unsigned long nr_segs, loff_t pos)
897 struct sock_iocb siocb, *x;
899 if (pos != 0)
900 return -ESPIPE;
902 x = alloc_sock_iocb(iocb, &siocb);
903 if (!x)
904 return -ENOMEM;
906 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
910 * Atomic setting of ioctl hooks to avoid race
911 * with module unload.
914 static DEFINE_MUTEX(br_ioctl_mutex);
915 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
917 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
919 mutex_lock(&br_ioctl_mutex);
920 br_ioctl_hook = hook;
921 mutex_unlock(&br_ioctl_mutex);
923 EXPORT_SYMBOL(brioctl_set);
925 static DEFINE_MUTEX(vlan_ioctl_mutex);
926 static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
928 void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
930 mutex_lock(&vlan_ioctl_mutex);
931 vlan_ioctl_hook = hook;
932 mutex_unlock(&vlan_ioctl_mutex);
934 EXPORT_SYMBOL(vlan_ioctl_set);
936 static DEFINE_MUTEX(dlci_ioctl_mutex);
937 static int (*dlci_ioctl_hook) (unsigned int, void __user *);
939 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
941 mutex_lock(&dlci_ioctl_mutex);
942 dlci_ioctl_hook = hook;
943 mutex_unlock(&dlci_ioctl_mutex);
945 EXPORT_SYMBOL(dlci_ioctl_set);
947 static long sock_do_ioctl(struct net *net, struct socket *sock,
948 unsigned int cmd, unsigned long arg)
950 int err;
951 void __user *argp = (void __user *)arg;
953 err = sock->ops->ioctl(sock, cmd, arg);
956 * If this ioctl is unknown try to hand it down
957 * to the NIC driver.
959 if (err == -ENOIOCTLCMD)
960 err = dev_ioctl(net, cmd, argp);
962 return err;
966 * With an ioctl, arg may well be a user mode pointer, but we don't know
967 * what to do with it - that's up to the protocol still.
970 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
972 struct socket *sock;
973 struct sock *sk;
974 void __user *argp = (void __user *)arg;
975 int pid, err;
976 struct net *net;
978 sock = file->private_data;
979 sk = sock->sk;
980 net = sock_net(sk);
981 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
982 err = dev_ioctl(net, cmd, argp);
983 } else
984 #ifdef CONFIG_WEXT_CORE
985 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
986 err = dev_ioctl(net, cmd, argp);
987 } else
988 #endif
989 switch (cmd) {
990 case FIOSETOWN:
991 case SIOCSPGRP:
992 err = -EFAULT;
993 if (get_user(pid, (int __user *)argp))
994 break;
995 err = f_setown(sock->file, pid, 1);
996 break;
997 case FIOGETOWN:
998 case SIOCGPGRP:
999 err = put_user(f_getown(sock->file),
1000 (int __user *)argp);
1001 break;
1002 case SIOCGIFBR:
1003 case SIOCSIFBR:
1004 case SIOCBRADDBR:
1005 case SIOCBRDELBR:
1006 err = -ENOPKG;
1007 if (!br_ioctl_hook)
1008 request_module("bridge");
1010 mutex_lock(&br_ioctl_mutex);
1011 if (br_ioctl_hook)
1012 err = br_ioctl_hook(net, cmd, argp);
1013 mutex_unlock(&br_ioctl_mutex);
1014 break;
1015 case SIOCGIFVLAN:
1016 case SIOCSIFVLAN:
1017 err = -ENOPKG;
1018 if (!vlan_ioctl_hook)
1019 request_module("8021q");
1021 mutex_lock(&vlan_ioctl_mutex);
1022 if (vlan_ioctl_hook)
1023 err = vlan_ioctl_hook(net, argp);
1024 mutex_unlock(&vlan_ioctl_mutex);
1025 break;
1026 case SIOCADDDLCI:
1027 case SIOCDELDLCI:
1028 err = -ENOPKG;
1029 if (!dlci_ioctl_hook)
1030 request_module("dlci");
1032 mutex_lock(&dlci_ioctl_mutex);
1033 if (dlci_ioctl_hook)
1034 err = dlci_ioctl_hook(cmd, argp);
1035 mutex_unlock(&dlci_ioctl_mutex);
1036 break;
1037 default:
1038 err = sock_do_ioctl(net, sock, cmd, arg);
1039 break;
1041 return err;
1044 int sock_create_lite(int family, int type, int protocol, struct socket **res)
1046 int err;
1047 struct socket *sock = NULL;
1049 err = security_socket_create(family, type, protocol, 1);
1050 if (err)
1051 goto out;
1053 sock = sock_alloc();
1054 if (!sock) {
1055 err = -ENOMEM;
1056 goto out;
1059 sock->type = type;
1060 err = security_socket_post_create(sock, family, type, protocol, 1);
1061 if (err)
1062 goto out_release;
1064 out:
1065 *res = sock;
1066 return err;
1067 out_release:
1068 sock_release(sock);
1069 sock = NULL;
1070 goto out;
1072 EXPORT_SYMBOL(sock_create_lite);
1074 /* No kernel lock held - perfect */
1075 static unsigned int sock_poll(struct file *file, poll_table *wait)
1077 struct socket *sock;
1080 * We can't return errors to poll, so it's either yes or no.
1082 sock = file->private_data;
1083 return sock->ops->poll(file, sock, wait);
1086 static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1088 struct socket *sock = file->private_data;
1090 return sock->ops->mmap(file, sock, vma);
1093 static int sock_close(struct inode *inode, struct file *filp)
1096 * It was possible the inode is NULL we were
1097 * closing an unfinished socket.
1100 if (!inode) {
1101 printk(KERN_DEBUG "sock_close: NULL inode\n");
1102 return 0;
1104 sock_release(SOCKET_I(inode));
1105 return 0;
1109 * Update the socket async list
1111 * Fasync_list locking strategy.
1113 * 1. fasync_list is modified only under process context socket lock
1114 * i.e. under semaphore.
1115 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1116 * or under socket lock
1119 static int sock_fasync(int fd, struct file *filp, int on)
1121 struct socket *sock = filp->private_data;
1122 struct sock *sk = sock->sk;
1123 struct socket_wq *wq;
1125 if (sk == NULL)
1126 return -EINVAL;
1128 lock_sock(sk);
1129 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1130 fasync_helper(fd, filp, on, &wq->fasync_list);
1132 if (!wq->fasync_list)
1133 sock_reset_flag(sk, SOCK_FASYNC);
1134 else
1135 sock_set_flag(sk, SOCK_FASYNC);
1137 release_sock(sk);
1138 return 0;
1141 /* This function may be called only under socket lock or callback_lock or rcu_lock */
1143 int sock_wake_async(struct socket *sock, int how, int band)
1145 struct socket_wq *wq;
1147 if (!sock)
1148 return -1;
1149 rcu_read_lock();
1150 wq = rcu_dereference(sock->wq);
1151 if (!wq || !wq->fasync_list) {
1152 rcu_read_unlock();
1153 return -1;
1155 switch (how) {
1156 case SOCK_WAKE_WAITD:
1157 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1158 break;
1159 goto call_kill;
1160 case SOCK_WAKE_SPACE:
1161 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1162 break;
1163 /* fall through */
1164 case SOCK_WAKE_IO:
1165 call_kill:
1166 kill_fasync(&wq->fasync_list, SIGIO, band);
1167 break;
1168 case SOCK_WAKE_URG:
1169 kill_fasync(&wq->fasync_list, SIGURG, band);
1171 rcu_read_unlock();
1172 return 0;
1174 EXPORT_SYMBOL(sock_wake_async);
1176 int __sock_create(struct net *net, int family, int type, int protocol,
1177 struct socket **res, int kern)
1179 int err;
1180 struct socket *sock;
1181 const struct net_proto_family *pf;
1184 * Check protocol is in range
1186 if (family < 0 || family >= NPROTO)
1187 return -EAFNOSUPPORT;
1188 if (type < 0 || type >= SOCK_MAX)
1189 return -EINVAL;
1191 /* Compatibility.
1193 This uglymoron is moved from INET layer to here to avoid
1194 deadlock in module load.
1196 if (family == PF_INET && type == SOCK_PACKET) {
1197 static int warned;
1198 if (!warned) {
1199 warned = 1;
1200 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1201 current->comm);
1203 family = PF_PACKET;
1206 err = security_socket_create(family, type, protocol, kern);
1207 if (err)
1208 return err;
1211 * Allocate the socket and allow the family to set things up. if
1212 * the protocol is 0, the family is instructed to select an appropriate
1213 * default.
1215 sock = sock_alloc();
1216 if (!sock) {
1217 if (net_ratelimit())
1218 printk(KERN_WARNING "socket: no more sockets\n");
1219 return -ENFILE; /* Not exactly a match, but its the
1220 closest posix thing */
1223 sock->type = type;
1225 #ifdef CONFIG_MODULES
1226 /* Attempt to load a protocol module if the find failed.
1228 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1229 * requested real, full-featured networking support upon configuration.
1230 * Otherwise module support will break!
1232 if (rcu_access_pointer(net_families[family]) == NULL)
1233 request_module("net-pf-%d", family);
1234 #endif
1236 rcu_read_lock();
1237 pf = rcu_dereference(net_families[family]);
1238 err = -EAFNOSUPPORT;
1239 if (!pf)
1240 goto out_release;
1243 * We will call the ->create function, that possibly is in a loadable
1244 * module, so we have to bump that loadable module refcnt first.
1246 if (!try_module_get(pf->owner))
1247 goto out_release;
1249 /* Now protected by module ref count */
1250 rcu_read_unlock();
1252 err = pf->create(net, sock, protocol, kern);
1253 if (err < 0)
1254 goto out_module_put;
1257 * Now to bump the refcnt of the [loadable] module that owns this
1258 * socket at sock_release time we decrement its refcnt.
1260 if (!try_module_get(sock->ops->owner))
1261 goto out_module_busy;
1264 * Now that we're done with the ->create function, the [loadable]
1265 * module can have its refcnt decremented
1267 module_put(pf->owner);
1268 err = security_socket_post_create(sock, family, type, protocol, kern);
1269 if (err)
1270 goto out_sock_release;
1271 *res = sock;
1273 return 0;
1275 out_module_busy:
1276 err = -EAFNOSUPPORT;
1277 out_module_put:
1278 sock->ops = NULL;
1279 module_put(pf->owner);
1280 out_sock_release:
1281 sock_release(sock);
1282 return err;
1284 out_release:
1285 rcu_read_unlock();
1286 goto out_sock_release;
1288 EXPORT_SYMBOL(__sock_create);
1290 int sock_create(int family, int type, int protocol, struct socket **res)
1292 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1294 EXPORT_SYMBOL(sock_create);
1296 int sock_create_kern(int family, int type, int protocol, struct socket **res)
1298 return __sock_create(&init_net, family, type, protocol, res, 1);
1300 EXPORT_SYMBOL(sock_create_kern);
1302 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1304 int retval;
1305 struct socket *sock;
1306 int flags;
1308 /* Check the SOCK_* constants for consistency. */
1309 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1310 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1311 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1312 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1314 flags = type & ~SOCK_TYPE_MASK;
1315 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1316 return -EINVAL;
1317 type &= SOCK_TYPE_MASK;
1319 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1320 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1322 retval = sock_create(family, type, protocol, &sock);
1323 if (retval < 0)
1324 goto out;
1326 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
1327 if (retval < 0)
1328 goto out_release;
1330 out:
1331 /* It may be already another descriptor 8) Not kernel problem. */
1332 return retval;
1334 out_release:
1335 sock_release(sock);
1336 return retval;
1340 * Create a pair of connected sockets.
1343 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1344 int __user *, usockvec)
1346 struct socket *sock1, *sock2;
1347 int fd1, fd2, err;
1348 struct file *newfile1, *newfile2;
1349 int flags;
1351 flags = type & ~SOCK_TYPE_MASK;
1352 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1353 return -EINVAL;
1354 type &= SOCK_TYPE_MASK;
1356 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1357 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1360 * Obtain the first socket and check if the underlying protocol
1361 * supports the socketpair call.
1364 err = sock_create(family, type, protocol, &sock1);
1365 if (err < 0)
1366 goto out;
1368 err = sock_create(family, type, protocol, &sock2);
1369 if (err < 0)
1370 goto out_release_1;
1372 err = sock1->ops->socketpair(sock1, sock2);
1373 if (err < 0)
1374 goto out_release_both;
1376 fd1 = sock_alloc_file(sock1, &newfile1, flags);
1377 if (unlikely(fd1 < 0)) {
1378 err = fd1;
1379 goto out_release_both;
1382 fd2 = sock_alloc_file(sock2, &newfile2, flags);
1383 if (unlikely(fd2 < 0)) {
1384 err = fd2;
1385 fput(newfile1);
1386 put_unused_fd(fd1);
1387 sock_release(sock2);
1388 goto out;
1391 audit_fd_pair(fd1, fd2);
1392 fd_install(fd1, newfile1);
1393 fd_install(fd2, newfile2);
1394 /* fd1 and fd2 may be already another descriptors.
1395 * Not kernel problem.
1398 err = put_user(fd1, &usockvec[0]);
1399 if (!err)
1400 err = put_user(fd2, &usockvec[1]);
1401 if (!err)
1402 return 0;
1404 sys_close(fd2);
1405 sys_close(fd1);
1406 return err;
1408 out_release_both:
1409 sock_release(sock2);
1410 out_release_1:
1411 sock_release(sock1);
1412 out:
1413 return err;
1417 * Bind a name to a socket. Nothing much to do here since it's
1418 * the protocol's responsibility to handle the local address.
1420 * We move the socket address to kernel space before we call
1421 * the protocol layer (having also checked the address is ok).
1424 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1426 struct socket *sock;
1427 struct sockaddr_storage address;
1428 int err, fput_needed;
1430 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1431 if (sock) {
1432 err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
1433 if (err >= 0) {
1434 err = security_socket_bind(sock,
1435 (struct sockaddr *)&address,
1436 addrlen);
1437 if (!err)
1438 err = sock->ops->bind(sock,
1439 (struct sockaddr *)
1440 &address, addrlen);
1442 fput_light(sock->file, fput_needed);
1444 return err;
1448 * Perform a listen. Basically, we allow the protocol to do anything
1449 * necessary for a listen, and if that works, we mark the socket as
1450 * ready for listening.
1453 SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1455 struct socket *sock;
1456 int err, fput_needed;
1457 int somaxconn;
1459 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1460 if (sock) {
1461 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1462 if ((unsigned)backlog > somaxconn)
1463 backlog = somaxconn;
1465 err = security_socket_listen(sock, backlog);
1466 if (!err)
1467 err = sock->ops->listen(sock, backlog);
1469 fput_light(sock->file, fput_needed);
1471 return err;
1475 * For accept, we attempt to create a new socket, set up the link
1476 * with the client, wake up the client, then return the new
1477 * connected fd. We collect the address of the connector in kernel
1478 * space and move it to user at the very end. This is unclean because
1479 * we open the socket then return an error.
1481 * 1003.1g adds the ability to recvmsg() to query connection pending
1482 * status to recvmsg. We need to add that support in a way thats
1483 * clean when we restucture accept also.
1486 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1487 int __user *, upeer_addrlen, int, flags)
1489 struct socket *sock, *newsock;
1490 struct file *newfile;
1491 int err, len, newfd, fput_needed;
1492 struct sockaddr_storage address;
1494 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1495 return -EINVAL;
1497 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1498 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1500 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1501 if (!sock)
1502 goto out;
1504 err = -ENFILE;
1505 newsock = sock_alloc();
1506 if (!newsock)
1507 goto out_put;
1509 newsock->type = sock->type;
1510 newsock->ops = sock->ops;
1513 * We don't need try_module_get here, as the listening socket (sock)
1514 * has the protocol module (sock->ops->owner) held.
1516 __module_get(newsock->ops->owner);
1518 newfd = sock_alloc_file(newsock, &newfile, flags);
1519 if (unlikely(newfd < 0)) {
1520 err = newfd;
1521 sock_release(newsock);
1522 goto out_put;
1525 err = security_socket_accept(sock, newsock);
1526 if (err)
1527 goto out_fd;
1529 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1530 if (err < 0)
1531 goto out_fd;
1533 if (upeer_sockaddr) {
1534 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1535 &len, 2) < 0) {
1536 err = -ECONNABORTED;
1537 goto out_fd;
1539 err = move_addr_to_user((struct sockaddr *)&address,
1540 len, upeer_sockaddr, upeer_addrlen);
1541 if (err < 0)
1542 goto out_fd;
1545 /* File flags are not inherited via accept() unlike another OSes. */
1547 fd_install(newfd, newfile);
1548 err = newfd;
1550 out_put:
1551 fput_light(sock->file, fput_needed);
1552 out:
1553 return err;
1554 out_fd:
1555 fput(newfile);
1556 put_unused_fd(newfd);
1557 goto out_put;
1560 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1561 int __user *, upeer_addrlen)
1563 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1567 * Attempt to connect to a socket with the server address. The address
1568 * is in user space so we verify it is OK and move it to kernel space.
1570 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1571 * break bindings
1573 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1574 * other SEQPACKET protocols that take time to connect() as it doesn't
1575 * include the -EINPROGRESS status for such sockets.
1578 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1579 int, addrlen)
1581 struct socket *sock;
1582 struct sockaddr_storage address;
1583 int err, fput_needed;
1585 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1586 if (!sock)
1587 goto out;
1588 err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
1589 if (err < 0)
1590 goto out_put;
1592 err =
1593 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1594 if (err)
1595 goto out_put;
1597 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1598 sock->file->f_flags);
1599 out_put:
1600 fput_light(sock->file, fput_needed);
1601 out:
1602 return err;
1606 * Get the local address ('name') of a socket object. Move the obtained
1607 * name to user space.
1610 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1611 int __user *, usockaddr_len)
1613 struct socket *sock;
1614 struct sockaddr_storage address;
1615 int len, err, fput_needed;
1617 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1618 if (!sock)
1619 goto out;
1621 err = security_socket_getsockname(sock);
1622 if (err)
1623 goto out_put;
1625 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1626 if (err)
1627 goto out_put;
1628 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
1630 out_put:
1631 fput_light(sock->file, fput_needed);
1632 out:
1633 return err;
1637 * Get the remote address ('name') of a socket object. Move the obtained
1638 * name to user space.
1641 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1642 int __user *, usockaddr_len)
1644 struct socket *sock;
1645 struct sockaddr_storage address;
1646 int len, err, fput_needed;
1648 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1649 if (sock != NULL) {
1650 err = security_socket_getpeername(sock);
1651 if (err) {
1652 fput_light(sock->file, fput_needed);
1653 return err;
1656 err =
1657 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1659 if (!err)
1660 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
1661 usockaddr_len);
1662 fput_light(sock->file, fput_needed);
1664 return err;
1668 * Send a datagram to a given address. We move the address into kernel
1669 * space and check the user space data area is readable before invoking
1670 * the protocol.
1673 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1674 unsigned, flags, struct sockaddr __user *, addr,
1675 int, addr_len)
1677 struct socket *sock;
1678 struct sockaddr_storage address;
1679 int err;
1680 struct msghdr msg;
1681 struct iovec iov;
1682 int fput_needed;
1684 if (len > INT_MAX)
1685 len = INT_MAX;
1686 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1687 if (!sock)
1688 goto out;
1690 iov.iov_base = buff;
1691 iov.iov_len = len;
1692 msg.msg_name = NULL;
1693 msg.msg_iov = &iov;
1694 msg.msg_iovlen = 1;
1695 msg.msg_control = NULL;
1696 msg.msg_controllen = 0;
1697 msg.msg_namelen = 0;
1698 if (addr) {
1699 err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
1700 if (err < 0)
1701 goto out_put;
1702 msg.msg_name = (struct sockaddr *)&address;
1703 msg.msg_namelen = addr_len;
1705 if (sock->file->f_flags & O_NONBLOCK)
1706 flags |= MSG_DONTWAIT;
1707 msg.msg_flags = flags;
1708 err = sock_sendmsg(sock, &msg, len);
1710 out_put:
1711 fput_light(sock->file, fput_needed);
1712 out:
1713 return err;
1717 * Send a datagram down a socket.
1720 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1721 unsigned, flags)
1723 return sys_sendto(fd, buff, len, flags, NULL, 0);
1727 * Receive a frame from the socket and optionally record the address of the
1728 * sender. We verify the buffers are writable and if needed move the
1729 * sender address from kernel to user space.
1732 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1733 unsigned, flags, struct sockaddr __user *, addr,
1734 int __user *, addr_len)
1736 struct socket *sock;
1737 struct iovec iov;
1738 struct msghdr msg;
1739 struct sockaddr_storage address;
1740 int err, err2;
1741 int fput_needed;
1743 if (size > INT_MAX)
1744 size = INT_MAX;
1745 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1746 if (!sock)
1747 goto out;
1749 msg.msg_control = NULL;
1750 msg.msg_controllen = 0;
1751 msg.msg_iovlen = 1;
1752 msg.msg_iov = &iov;
1753 iov.iov_len = size;
1754 iov.iov_base = ubuf;
1755 msg.msg_name = (struct sockaddr *)&address;
1756 msg.msg_namelen = sizeof(address);
1757 if (sock->file->f_flags & O_NONBLOCK)
1758 flags |= MSG_DONTWAIT;
1759 err = sock_recvmsg(sock, &msg, size, flags);
1761 if (err >= 0 && addr != NULL) {
1762 err2 = move_addr_to_user((struct sockaddr *)&address,
1763 msg.msg_namelen, addr, addr_len);
1764 if (err2 < 0)
1765 err = err2;
1768 fput_light(sock->file, fput_needed);
1769 out:
1770 return err;
1774 * Receive a datagram from a socket.
1777 asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1778 unsigned flags)
1780 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1784 * Set a socket option. Because we don't know the option lengths we have
1785 * to pass the user mode parameter for the protocols to sort out.
1788 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1789 char __user *, optval, int, optlen)
1791 int err, fput_needed;
1792 struct socket *sock;
1794 if (optlen < 0)
1795 return -EINVAL;
1797 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1798 if (sock != NULL) {
1799 err = security_socket_setsockopt(sock, level, optname);
1800 if (err)
1801 goto out_put;
1803 if (level == SOL_SOCKET)
1804 err =
1805 sock_setsockopt(sock, level, optname, optval,
1806 optlen);
1807 else
1808 err =
1809 sock->ops->setsockopt(sock, level, optname, optval,
1810 optlen);
1811 out_put:
1812 fput_light(sock->file, fput_needed);
1814 return err;
1818 * Get a socket option. Because we don't know the option lengths we have
1819 * to pass a user mode parameter for the protocols to sort out.
1822 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1823 char __user *, optval, int __user *, optlen)
1825 int err, fput_needed;
1826 struct socket *sock;
1828 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1829 if (sock != NULL) {
1830 err = security_socket_getsockopt(sock, level, optname);
1831 if (err)
1832 goto out_put;
1834 if (level == SOL_SOCKET)
1835 err =
1836 sock_getsockopt(sock, level, optname, optval,
1837 optlen);
1838 else
1839 err =
1840 sock->ops->getsockopt(sock, level, optname, optval,
1841 optlen);
1842 out_put:
1843 fput_light(sock->file, fput_needed);
1845 return err;
1849 * Shutdown a socket.
1852 SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1854 int err, fput_needed;
1855 struct socket *sock;
1857 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1858 if (sock != NULL) {
1859 err = security_socket_shutdown(sock, how);
1860 if (!err)
1861 err = sock->ops->shutdown(sock, how);
1862 fput_light(sock->file, fput_needed);
1864 return err;
1867 /* A couple of helpful macros for getting the address of the 32/64 bit
1868 * fields which are the same type (int / unsigned) on our platforms.
1870 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1871 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1872 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1874 static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
1875 struct msghdr *msg_sys, unsigned flags, int nosec)
1877 struct compat_msghdr __user *msg_compat =
1878 (struct compat_msghdr __user *)msg;
1879 struct sockaddr_storage address;
1880 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1881 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1882 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1883 /* 20 is size of ipv6_pktinfo */
1884 unsigned char *ctl_buf = ctl;
1885 int err, ctl_len, iov_size, total_len;
1887 err = -EFAULT;
1888 if (MSG_CMSG_COMPAT & flags) {
1889 if (get_compat_msghdr(msg_sys, msg_compat))
1890 return -EFAULT;
1891 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
1892 return -EFAULT;
1894 /* do not move before msg_sys is valid */
1895 err = -EMSGSIZE;
1896 if (msg_sys->msg_iovlen > UIO_MAXIOV)
1897 goto out;
1899 /* Check whether to allocate the iovec area */
1900 err = -ENOMEM;
1901 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
1902 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
1903 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
1904 if (!iov)
1905 goto out;
1908 /* This will also move the address data into kernel space */
1909 if (MSG_CMSG_COMPAT & flags) {
1910 err = verify_compat_iovec(msg_sys, iov,
1911 (struct sockaddr *)&address,
1912 VERIFY_READ);
1913 } else
1914 err = verify_iovec(msg_sys, iov,
1915 (struct sockaddr *)&address,
1916 VERIFY_READ);
1917 if (err < 0)
1918 goto out_freeiov;
1919 total_len = err;
1921 err = -ENOBUFS;
1923 if (msg_sys->msg_controllen > INT_MAX)
1924 goto out_freeiov;
1925 ctl_len = msg_sys->msg_controllen;
1926 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1927 err =
1928 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
1929 sizeof(ctl));
1930 if (err)
1931 goto out_freeiov;
1932 ctl_buf = msg_sys->msg_control;
1933 ctl_len = msg_sys->msg_controllen;
1934 } else if (ctl_len) {
1935 if (ctl_len > sizeof(ctl)) {
1936 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1937 if (ctl_buf == NULL)
1938 goto out_freeiov;
1940 err = -EFAULT;
1942 * Careful! Before this, msg_sys->msg_control contains a user pointer.
1943 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1944 * checking falls down on this.
1946 if (copy_from_user(ctl_buf,
1947 (void __user __force *)msg_sys->msg_control,
1948 ctl_len))
1949 goto out_freectl;
1950 msg_sys->msg_control = ctl_buf;
1952 msg_sys->msg_flags = flags;
1954 if (sock->file->f_flags & O_NONBLOCK)
1955 msg_sys->msg_flags |= MSG_DONTWAIT;
1956 err = (nosec ? sock_sendmsg_nosec : sock_sendmsg)(sock, msg_sys,
1957 total_len);
1959 out_freectl:
1960 if (ctl_buf != ctl)
1961 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
1962 out_freeiov:
1963 if (iov != iovstack)
1964 sock_kfree_s(sock->sk, iov, iov_size);
1965 out:
1966 return err;
1970 * BSD sendmsg interface
1973 SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
1975 int fput_needed, err;
1976 struct msghdr msg_sys;
1977 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
1979 if (!sock)
1980 goto out;
1982 err = __sys_sendmsg(sock, msg, &msg_sys, flags, 0);
1984 fput_light(sock->file, fput_needed);
1985 out:
1986 return err;
1990 * Linux sendmmsg interface
1993 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
1994 unsigned int flags)
1996 int fput_needed, err, datagrams;
1997 struct socket *sock;
1998 struct mmsghdr __user *entry;
1999 struct compat_mmsghdr __user *compat_entry;
2000 struct msghdr msg_sys;
2002 datagrams = 0;
2004 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2005 if (!sock)
2006 return err;
2008 err = sock_error(sock->sk);
2009 if (err)
2010 goto out_put;
2012 entry = mmsg;
2013 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2015 while (datagrams < vlen) {
2017 * No need to ask LSM for more than the first datagram.
2019 if (MSG_CMSG_COMPAT & flags) {
2020 err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2021 &msg_sys, flags, datagrams);
2022 if (err < 0)
2023 break;
2024 err = __put_user(err, &compat_entry->msg_len);
2025 ++compat_entry;
2026 } else {
2027 err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
2028 &msg_sys, flags, datagrams);
2029 if (err < 0)
2030 break;
2031 err = put_user(err, &entry->msg_len);
2032 ++entry;
2035 if (err)
2036 break;
2037 ++datagrams;
2040 out_put:
2041 fput_light(sock->file, fput_needed);
2043 if (err == 0)
2044 return datagrams;
2046 if (datagrams != 0) {
2048 * We may send less entries than requested (vlen) if the
2049 * sock is non blocking...
2051 if (err != -EAGAIN) {
2053 * ... or if sendmsg returns an error after we
2054 * send some datagrams, where we record the
2055 * error to return on the next call or if the
2056 * app asks about it using getsockopt(SO_ERROR).
2058 sock->sk->sk_err = -err;
2061 return datagrams;
2064 return err;
2067 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2068 unsigned int, vlen, unsigned int, flags)
2070 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2073 static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2074 struct msghdr *msg_sys, unsigned flags, int nosec)
2076 struct compat_msghdr __user *msg_compat =
2077 (struct compat_msghdr __user *)msg;
2078 struct iovec iovstack[UIO_FASTIOV];
2079 struct iovec *iov = iovstack;
2080 unsigned long cmsg_ptr;
2081 int err, iov_size, total_len, len;
2083 /* kernel mode address */
2084 struct sockaddr_storage addr;
2086 /* user mode address pointers */
2087 struct sockaddr __user *uaddr;
2088 int __user *uaddr_len;
2090 if (MSG_CMSG_COMPAT & flags) {
2091 if (get_compat_msghdr(msg_sys, msg_compat))
2092 return -EFAULT;
2093 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
2094 return -EFAULT;
2096 err = -EMSGSIZE;
2097 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2098 goto out;
2100 /* Check whether to allocate the iovec area */
2101 err = -ENOMEM;
2102 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec);
2103 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2104 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
2105 if (!iov)
2106 goto out;
2110 * Save the user-mode address (verify_iovec will change the
2111 * kernel msghdr to use the kernel address space)
2114 uaddr = (__force void __user *)msg_sys->msg_name;
2115 uaddr_len = COMPAT_NAMELEN(msg);
2116 if (MSG_CMSG_COMPAT & flags) {
2117 err = verify_compat_iovec(msg_sys, iov,
2118 (struct sockaddr *)&addr,
2119 VERIFY_WRITE);
2120 } else
2121 err = verify_iovec(msg_sys, iov,
2122 (struct sockaddr *)&addr,
2123 VERIFY_WRITE);
2124 if (err < 0)
2125 goto out_freeiov;
2126 total_len = err;
2128 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2129 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2131 if (sock->file->f_flags & O_NONBLOCK)
2132 flags |= MSG_DONTWAIT;
2133 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2134 total_len, flags);
2135 if (err < 0)
2136 goto out_freeiov;
2137 len = err;
2139 if (uaddr != NULL) {
2140 err = move_addr_to_user((struct sockaddr *)&addr,
2141 msg_sys->msg_namelen, uaddr,
2142 uaddr_len);
2143 if (err < 0)
2144 goto out_freeiov;
2146 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2147 COMPAT_FLAGS(msg));
2148 if (err)
2149 goto out_freeiov;
2150 if (MSG_CMSG_COMPAT & flags)
2151 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2152 &msg_compat->msg_controllen);
2153 else
2154 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2155 &msg->msg_controllen);
2156 if (err)
2157 goto out_freeiov;
2158 err = len;
2160 out_freeiov:
2161 if (iov != iovstack)
2162 sock_kfree_s(sock->sk, iov, iov_size);
2163 out:
2164 return err;
2168 * BSD recvmsg interface
2171 SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2172 unsigned int, flags)
2174 int fput_needed, err;
2175 struct msghdr msg_sys;
2176 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2178 if (!sock)
2179 goto out;
2181 err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2183 fput_light(sock->file, fput_needed);
2184 out:
2185 return err;
2189 * Linux recvmmsg interface
2192 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2193 unsigned int flags, struct timespec *timeout)
2195 int fput_needed, err, datagrams;
2196 struct socket *sock;
2197 struct mmsghdr __user *entry;
2198 struct compat_mmsghdr __user *compat_entry;
2199 struct msghdr msg_sys;
2200 struct timespec end_time;
2202 if (timeout &&
2203 poll_select_set_timeout(&end_time, timeout->tv_sec,
2204 timeout->tv_nsec))
2205 return -EINVAL;
2207 datagrams = 0;
2209 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2210 if (!sock)
2211 return err;
2213 err = sock_error(sock->sk);
2214 if (err)
2215 goto out_put;
2217 entry = mmsg;
2218 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2220 while (datagrams < vlen) {
2222 * No need to ask LSM for more than the first datagram.
2224 if (MSG_CMSG_COMPAT & flags) {
2225 err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2226 &msg_sys, flags & ~MSG_WAITFORONE,
2227 datagrams);
2228 if (err < 0)
2229 break;
2230 err = __put_user(err, &compat_entry->msg_len);
2231 ++compat_entry;
2232 } else {
2233 err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
2234 &msg_sys, flags & ~MSG_WAITFORONE,
2235 datagrams);
2236 if (err < 0)
2237 break;
2238 err = put_user(err, &entry->msg_len);
2239 ++entry;
2242 if (err)
2243 break;
2244 ++datagrams;
2246 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2247 if (flags & MSG_WAITFORONE)
2248 flags |= MSG_DONTWAIT;
2250 if (timeout) {
2251 ktime_get_ts(timeout);
2252 *timeout = timespec_sub(end_time, *timeout);
2253 if (timeout->tv_sec < 0) {
2254 timeout->tv_sec = timeout->tv_nsec = 0;
2255 break;
2258 /* Timeout, return less than vlen datagrams */
2259 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2260 break;
2263 /* Out of band data, return right away */
2264 if (msg_sys.msg_flags & MSG_OOB)
2265 break;
2268 out_put:
2269 fput_light(sock->file, fput_needed);
2271 if (err == 0)
2272 return datagrams;
2274 if (datagrams != 0) {
2276 * We may return less entries than requested (vlen) if the
2277 * sock is non block and there aren't enough datagrams...
2279 if (err != -EAGAIN) {
2281 * ... or if recvmsg returns an error after we
2282 * received some datagrams, where we record the
2283 * error to return on the next call or if the
2284 * app asks about it using getsockopt(SO_ERROR).
2286 sock->sk->sk_err = -err;
2289 return datagrams;
2292 return err;
2295 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2296 unsigned int, vlen, unsigned int, flags,
2297 struct timespec __user *, timeout)
2299 int datagrams;
2300 struct timespec timeout_sys;
2302 if (!timeout)
2303 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2305 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2306 return -EFAULT;
2308 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2310 if (datagrams > 0 &&
2311 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2312 datagrams = -EFAULT;
2314 return datagrams;
2317 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2318 /* Argument list sizes for sys_socketcall */
2319 #define AL(x) ((x) * sizeof(unsigned long))
2320 static const unsigned char nargs[21] = {
2321 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2322 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2323 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2324 AL(4), AL(5), AL(4)
2327 #undef AL
2330 * System call vectors.
2332 * Argument checking cleaned up. Saved 20% in size.
2333 * This function doesn't need to set the kernel lock because
2334 * it is set by the callees.
2337 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2339 unsigned long a[6];
2340 unsigned long a0, a1;
2341 int err;
2342 unsigned int len;
2344 if (call < 1 || call > SYS_SENDMMSG)
2345 return -EINVAL;
2347 len = nargs[call];
2348 if (len > sizeof(a))
2349 return -EINVAL;
2351 /* copy_from_user should be SMP safe. */
2352 if (copy_from_user(a, args, len))
2353 return -EFAULT;
2355 audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2357 a0 = a[0];
2358 a1 = a[1];
2360 switch (call) {
2361 case SYS_SOCKET:
2362 err = sys_socket(a0, a1, a[2]);
2363 break;
2364 case SYS_BIND:
2365 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2366 break;
2367 case SYS_CONNECT:
2368 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2369 break;
2370 case SYS_LISTEN:
2371 err = sys_listen(a0, a1);
2372 break;
2373 case SYS_ACCEPT:
2374 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2375 (int __user *)a[2], 0);
2376 break;
2377 case SYS_GETSOCKNAME:
2378 err =
2379 sys_getsockname(a0, (struct sockaddr __user *)a1,
2380 (int __user *)a[2]);
2381 break;
2382 case SYS_GETPEERNAME:
2383 err =
2384 sys_getpeername(a0, (struct sockaddr __user *)a1,
2385 (int __user *)a[2]);
2386 break;
2387 case SYS_SOCKETPAIR:
2388 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2389 break;
2390 case SYS_SEND:
2391 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2392 break;
2393 case SYS_SENDTO:
2394 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2395 (struct sockaddr __user *)a[4], a[5]);
2396 break;
2397 case SYS_RECV:
2398 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2399 break;
2400 case SYS_RECVFROM:
2401 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2402 (struct sockaddr __user *)a[4],
2403 (int __user *)a[5]);
2404 break;
2405 case SYS_SHUTDOWN:
2406 err = sys_shutdown(a0, a1);
2407 break;
2408 case SYS_SETSOCKOPT:
2409 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2410 break;
2411 case SYS_GETSOCKOPT:
2412 err =
2413 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2414 (int __user *)a[4]);
2415 break;
2416 case SYS_SENDMSG:
2417 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2418 break;
2419 case SYS_SENDMMSG:
2420 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2421 break;
2422 case SYS_RECVMSG:
2423 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2424 break;
2425 case SYS_RECVMMSG:
2426 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2427 (struct timespec __user *)a[4]);
2428 break;
2429 case SYS_ACCEPT4:
2430 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2431 (int __user *)a[2], a[3]);
2432 break;
2433 default:
2434 err = -EINVAL;
2435 break;
2437 return err;
2440 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
2443 * sock_register - add a socket protocol handler
2444 * @ops: description of protocol
2446 * This function is called by a protocol handler that wants to
2447 * advertise its address family, and have it linked into the
2448 * socket interface. The value ops->family coresponds to the
2449 * socket system call protocol family.
2451 int sock_register(const struct net_proto_family *ops)
2453 int err;
2455 if (ops->family >= NPROTO) {
2456 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2457 NPROTO);
2458 return -ENOBUFS;
2461 spin_lock(&net_family_lock);
2462 if (rcu_dereference_protected(net_families[ops->family],
2463 lockdep_is_held(&net_family_lock)))
2464 err = -EEXIST;
2465 else {
2466 rcu_assign_pointer(net_families[ops->family], ops);
2467 err = 0;
2469 spin_unlock(&net_family_lock);
2471 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
2472 return err;
2474 EXPORT_SYMBOL(sock_register);
2477 * sock_unregister - remove a protocol handler
2478 * @family: protocol family to remove
2480 * This function is called by a protocol handler that wants to
2481 * remove its address family, and have it unlinked from the
2482 * new socket creation.
2484 * If protocol handler is a module, then it can use module reference
2485 * counts to protect against new references. If protocol handler is not
2486 * a module then it needs to provide its own protection in
2487 * the ops->create routine.
2489 void sock_unregister(int family)
2491 BUG_ON(family < 0 || family >= NPROTO);
2493 spin_lock(&net_family_lock);
2494 rcu_assign_pointer(net_families[family], NULL);
2495 spin_unlock(&net_family_lock);
2497 synchronize_rcu();
2499 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
2501 EXPORT_SYMBOL(sock_unregister);
2503 static int __init sock_init(void)
2505 int err;
2508 * Initialize sock SLAB cache.
2511 sk_init();
2514 * Initialize skbuff SLAB cache
2516 skb_init();
2519 * Initialize the protocols module.
2522 init_inodecache();
2524 err = register_filesystem(&sock_fs_type);
2525 if (err)
2526 goto out_fs;
2527 sock_mnt = kern_mount(&sock_fs_type);
2528 if (IS_ERR(sock_mnt)) {
2529 err = PTR_ERR(sock_mnt);
2530 goto out_mount;
2533 /* The real protocol initialization is performed in later initcalls.
2536 #ifdef CONFIG_NETFILTER
2537 netfilter_init();
2538 #endif
2540 #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
2541 skb_timestamping_init();
2542 #endif
2544 out:
2545 return err;
2547 out_mount:
2548 unregister_filesystem(&sock_fs_type);
2549 out_fs:
2550 goto out;
2553 core_initcall(sock_init); /* early initcall */
2555 #ifdef CONFIG_PROC_FS
2556 void socket_seq_show(struct seq_file *seq)
2558 int cpu;
2559 int counter = 0;
2561 for_each_possible_cpu(cpu)
2562 counter += per_cpu(sockets_in_use, cpu);
2564 /* It can be negative, by the way. 8) */
2565 if (counter < 0)
2566 counter = 0;
2568 seq_printf(seq, "sockets: used %d\n", counter);
2570 #endif /* CONFIG_PROC_FS */
2572 #ifdef CONFIG_COMPAT
2573 static int do_siocgstamp(struct net *net, struct socket *sock,
2574 unsigned int cmd, struct compat_timeval __user *up)
2576 mm_segment_t old_fs = get_fs();
2577 struct timeval ktv;
2578 int err;
2580 set_fs(KERNEL_DS);
2581 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2582 set_fs(old_fs);
2583 if (!err) {
2584 err = put_user(ktv.tv_sec, &up->tv_sec);
2585 err |= __put_user(ktv.tv_usec, &up->tv_usec);
2587 return err;
2590 static int do_siocgstampns(struct net *net, struct socket *sock,
2591 unsigned int cmd, struct compat_timespec __user *up)
2593 mm_segment_t old_fs = get_fs();
2594 struct timespec kts;
2595 int err;
2597 set_fs(KERNEL_DS);
2598 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2599 set_fs(old_fs);
2600 if (!err) {
2601 err = put_user(kts.tv_sec, &up->tv_sec);
2602 err |= __put_user(kts.tv_nsec, &up->tv_nsec);
2604 return err;
2607 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2609 struct ifreq __user *uifr;
2610 int err;
2612 uifr = compat_alloc_user_space(sizeof(struct ifreq));
2613 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2614 return -EFAULT;
2616 err = dev_ioctl(net, SIOCGIFNAME, uifr);
2617 if (err)
2618 return err;
2620 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2621 return -EFAULT;
2623 return 0;
2626 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2628 struct compat_ifconf ifc32;
2629 struct ifconf ifc;
2630 struct ifconf __user *uifc;
2631 struct compat_ifreq __user *ifr32;
2632 struct ifreq __user *ifr;
2633 unsigned int i, j;
2634 int err;
2636 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2637 return -EFAULT;
2639 if (ifc32.ifcbuf == 0) {
2640 ifc32.ifc_len = 0;
2641 ifc.ifc_len = 0;
2642 ifc.ifc_req = NULL;
2643 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2644 } else {
2645 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2646 sizeof(struct ifreq);
2647 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2648 ifc.ifc_len = len;
2649 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2650 ifr32 = compat_ptr(ifc32.ifcbuf);
2651 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2652 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2653 return -EFAULT;
2654 ifr++;
2655 ifr32++;
2658 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2659 return -EFAULT;
2661 err = dev_ioctl(net, SIOCGIFCONF, uifc);
2662 if (err)
2663 return err;
2665 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2666 return -EFAULT;
2668 ifr = ifc.ifc_req;
2669 ifr32 = compat_ptr(ifc32.ifcbuf);
2670 for (i = 0, j = 0;
2671 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2672 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2673 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2674 return -EFAULT;
2675 ifr32++;
2676 ifr++;
2679 if (ifc32.ifcbuf == 0) {
2680 /* Translate from 64-bit structure multiple to
2681 * a 32-bit one.
2683 i = ifc.ifc_len;
2684 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2685 ifc32.ifc_len = i;
2686 } else {
2687 ifc32.ifc_len = i;
2689 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2690 return -EFAULT;
2692 return 0;
2695 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2697 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2698 bool convert_in = false, convert_out = false;
2699 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2700 struct ethtool_rxnfc __user *rxnfc;
2701 struct ifreq __user *ifr;
2702 u32 rule_cnt = 0, actual_rule_cnt;
2703 u32 ethcmd;
2704 u32 data;
2705 int ret;
2707 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2708 return -EFAULT;
2710 compat_rxnfc = compat_ptr(data);
2712 if (get_user(ethcmd, &compat_rxnfc->cmd))
2713 return -EFAULT;
2715 /* Most ethtool structures are defined without padding.
2716 * Unfortunately struct ethtool_rxnfc is an exception.
2718 switch (ethcmd) {
2719 default:
2720 break;
2721 case ETHTOOL_GRXCLSRLALL:
2722 /* Buffer size is variable */
2723 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2724 return -EFAULT;
2725 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2726 return -ENOMEM;
2727 buf_size += rule_cnt * sizeof(u32);
2728 /* fall through */
2729 case ETHTOOL_GRXRINGS:
2730 case ETHTOOL_GRXCLSRLCNT:
2731 case ETHTOOL_GRXCLSRULE:
2732 convert_out = true;
2733 /* fall through */
2734 case ETHTOOL_SRXCLSRLDEL:
2735 case ETHTOOL_SRXCLSRLINS:
2736 buf_size += sizeof(struct ethtool_rxnfc);
2737 convert_in = true;
2738 break;
2741 ifr = compat_alloc_user_space(buf_size);
2742 rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);
2744 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2745 return -EFAULT;
2747 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2748 &ifr->ifr_ifru.ifru_data))
2749 return -EFAULT;
2751 if (convert_in) {
2752 /* We expect there to be holes between fs.m_ext and
2753 * fs.ring_cookie and at the end of fs, but nowhere else.
2755 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2756 sizeof(compat_rxnfc->fs.m_ext) !=
2757 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2758 sizeof(rxnfc->fs.m_ext));
2759 BUILD_BUG_ON(
2760 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2761 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2762 offsetof(struct ethtool_rxnfc, fs.location) -
2763 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2765 if (copy_in_user(rxnfc, compat_rxnfc,
2766 (void *)(&rxnfc->fs.m_ext + 1) -
2767 (void *)rxnfc) ||
2768 copy_in_user(&rxnfc->fs.ring_cookie,
2769 &compat_rxnfc->fs.ring_cookie,
2770 (void *)(&rxnfc->fs.location + 1) -
2771 (void *)&rxnfc->fs.ring_cookie) ||
2772 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2773 sizeof(rxnfc->rule_cnt)))
2774 return -EFAULT;
2777 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2778 if (ret)
2779 return ret;
2781 if (convert_out) {
2782 if (copy_in_user(compat_rxnfc, rxnfc,
2783 (const void *)(&rxnfc->fs.m_ext + 1) -
2784 (const void *)rxnfc) ||
2785 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2786 &rxnfc->fs.ring_cookie,
2787 (const void *)(&rxnfc->fs.location + 1) -
2788 (const void *)&rxnfc->fs.ring_cookie) ||
2789 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2790 sizeof(rxnfc->rule_cnt)))
2791 return -EFAULT;
2793 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2794 /* As an optimisation, we only copy the actual
2795 * number of rules that the underlying
2796 * function returned. Since Mallory might
2797 * change the rule count in user memory, we
2798 * check that it is less than the rule count
2799 * originally given (as the user buffer size),
2800 * which has been range-checked.
2802 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2803 return -EFAULT;
2804 if (actual_rule_cnt < rule_cnt)
2805 rule_cnt = actual_rule_cnt;
2806 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2807 &rxnfc->rule_locs[0],
2808 rule_cnt * sizeof(u32)))
2809 return -EFAULT;
2813 return 0;
2816 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2818 void __user *uptr;
2819 compat_uptr_t uptr32;
2820 struct ifreq __user *uifr;
2822 uifr = compat_alloc_user_space(sizeof(*uifr));
2823 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2824 return -EFAULT;
2826 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2827 return -EFAULT;
2829 uptr = compat_ptr(uptr32);
2831 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2832 return -EFAULT;
2834 return dev_ioctl(net, SIOCWANDEV, uifr);
2837 static int bond_ioctl(struct net *net, unsigned int cmd,
2838 struct compat_ifreq __user *ifr32)
2840 struct ifreq kifr;
2841 struct ifreq __user *uifr;
2842 mm_segment_t old_fs;
2843 int err;
2844 u32 data;
2845 void __user *datap;
2847 switch (cmd) {
2848 case SIOCBONDENSLAVE:
2849 case SIOCBONDRELEASE:
2850 case SIOCBONDSETHWADDR:
2851 case SIOCBONDCHANGEACTIVE:
2852 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2853 return -EFAULT;
2855 old_fs = get_fs();
2856 set_fs(KERNEL_DS);
2857 err = dev_ioctl(net, cmd,
2858 (struct ifreq __user __force *) &kifr);
2859 set_fs(old_fs);
2861 return err;
2862 case SIOCBONDSLAVEINFOQUERY:
2863 case SIOCBONDINFOQUERY:
2864 uifr = compat_alloc_user_space(sizeof(*uifr));
2865 if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2866 return -EFAULT;
2868 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2869 return -EFAULT;
2871 datap = compat_ptr(data);
2872 if (put_user(datap, &uifr->ifr_ifru.ifru_data))
2873 return -EFAULT;
2875 return dev_ioctl(net, cmd, uifr);
2876 default:
2877 return -EINVAL;
2881 static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
2882 struct compat_ifreq __user *u_ifreq32)
2884 struct ifreq __user *u_ifreq64;
2885 char tmp_buf[IFNAMSIZ];
2886 void __user *data64;
2887 u32 data32;
2889 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2890 IFNAMSIZ))
2891 return -EFAULT;
2892 if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
2893 return -EFAULT;
2894 data64 = compat_ptr(data32);
2896 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2898 /* Don't check these user accesses, just let that get trapped
2899 * in the ioctl handler instead.
2901 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2902 IFNAMSIZ))
2903 return -EFAULT;
2904 if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
2905 return -EFAULT;
2907 return dev_ioctl(net, cmd, u_ifreq64);
2910 static int dev_ifsioc(struct net *net, struct socket *sock,
2911 unsigned int cmd, struct compat_ifreq __user *uifr32)
2913 struct ifreq __user *uifr;
2914 int err;
2916 uifr = compat_alloc_user_space(sizeof(*uifr));
2917 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2918 return -EFAULT;
2920 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2922 if (!err) {
2923 switch (cmd) {
2924 case SIOCGIFFLAGS:
2925 case SIOCGIFMETRIC:
2926 case SIOCGIFMTU:
2927 case SIOCGIFMEM:
2928 case SIOCGIFHWADDR:
2929 case SIOCGIFINDEX:
2930 case SIOCGIFADDR:
2931 case SIOCGIFBRDADDR:
2932 case SIOCGIFDSTADDR:
2933 case SIOCGIFNETMASK:
2934 case SIOCGIFPFLAGS:
2935 case SIOCGIFTXQLEN:
2936 case SIOCGMIIPHY:
2937 case SIOCGMIIREG:
2938 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
2939 err = -EFAULT;
2940 break;
2943 return err;
2946 static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2947 struct compat_ifreq __user *uifr32)
2949 struct ifreq ifr;
2950 struct compat_ifmap __user *uifmap32;
2951 mm_segment_t old_fs;
2952 int err;
2954 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2955 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
2956 err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2957 err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2958 err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2959 err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
2960 err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
2961 err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
2962 if (err)
2963 return -EFAULT;
2965 old_fs = get_fs();
2966 set_fs(KERNEL_DS);
2967 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
2968 set_fs(old_fs);
2970 if (cmd == SIOCGIFMAP && !err) {
2971 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
2972 err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2973 err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2974 err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2975 err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
2976 err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
2977 err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
2978 if (err)
2979 err = -EFAULT;
2981 return err;
2984 static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
2986 void __user *uptr;
2987 compat_uptr_t uptr32;
2988 struct ifreq __user *uifr;
2990 uifr = compat_alloc_user_space(sizeof(*uifr));
2991 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2992 return -EFAULT;
2994 if (get_user(uptr32, &uifr32->ifr_data))
2995 return -EFAULT;
2997 uptr = compat_ptr(uptr32);
2999 if (put_user(uptr, &uifr->ifr_data))
3000 return -EFAULT;
3002 return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
3005 struct rtentry32 {
3006 u32 rt_pad1;
3007 struct sockaddr rt_dst; /* target address */
3008 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3009 struct sockaddr rt_genmask; /* target network mask (IP) */
3010 unsigned short rt_flags;
3011 short rt_pad2;
3012 u32 rt_pad3;
3013 unsigned char rt_tos;
3014 unsigned char rt_class;
3015 short rt_pad4;
3016 short rt_metric; /* +1 for binary compatibility! */
3017 /* char * */ u32 rt_dev; /* forcing the device at add */
3018 u32 rt_mtu; /* per route MTU/Window */
3019 u32 rt_window; /* Window clamping */
3020 unsigned short rt_irtt; /* Initial RTT */
3023 struct in6_rtmsg32 {
3024 struct in6_addr rtmsg_dst;
3025 struct in6_addr rtmsg_src;
3026 struct in6_addr rtmsg_gateway;
3027 u32 rtmsg_type;
3028 u16 rtmsg_dst_len;
3029 u16 rtmsg_src_len;
3030 u32 rtmsg_metric;
3031 u32 rtmsg_info;
3032 u32 rtmsg_flags;
3033 s32 rtmsg_ifindex;
3036 static int routing_ioctl(struct net *net, struct socket *sock,
3037 unsigned int cmd, void __user *argp)
3039 int ret;
3040 void *r = NULL;
3041 struct in6_rtmsg r6;
3042 struct rtentry r4;
3043 char devname[16];
3044 u32 rtdev;
3045 mm_segment_t old_fs = get_fs();
3047 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3048 struct in6_rtmsg32 __user *ur6 = argp;
3049 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3050 3 * sizeof(struct in6_addr));
3051 ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3052 ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3053 ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3054 ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3055 ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3056 ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3057 ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3059 r = (void *) &r6;
3060 } else { /* ipv4 */
3061 struct rtentry32 __user *ur4 = argp;
3062 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3063 3 * sizeof(struct sockaddr));
3064 ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
3065 ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
3066 ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
3067 ret |= __get_user(r4.rt_window, &(ur4->rt_window));
3068 ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
3069 ret |= __get_user(rtdev, &(ur4->rt_dev));
3070 if (rtdev) {
3071 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3072 r4.rt_dev = (char __user __force *)devname;
3073 devname[15] = 0;
3074 } else
3075 r4.rt_dev = NULL;
3077 r = (void *) &r4;
3080 if (ret) {
3081 ret = -EFAULT;
3082 goto out;
3085 set_fs(KERNEL_DS);
3086 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3087 set_fs(old_fs);
3089 out:
3090 return ret;
3093 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3094 * for some operations; this forces use of the newer bridge-utils that
3095 * use compatible ioctls
3097 static int old_bridge_ioctl(compat_ulong_t __user *argp)
3099 compat_ulong_t tmp;
3101 if (get_user(tmp, argp))
3102 return -EFAULT;
3103 if (tmp == BRCTL_GET_VERSION)
3104 return BRCTL_VERSION + 1;
3105 return -EINVAL;
3108 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3109 unsigned int cmd, unsigned long arg)
3111 void __user *argp = compat_ptr(arg);
3112 struct sock *sk = sock->sk;
3113 struct net *net = sock_net(sk);
3115 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3116 return siocdevprivate_ioctl(net, cmd, argp);
3118 switch (cmd) {
3119 case SIOCSIFBR:
3120 case SIOCGIFBR:
3121 return old_bridge_ioctl(argp);
3122 case SIOCGIFNAME:
3123 return dev_ifname32(net, argp);
3124 case SIOCGIFCONF:
3125 return dev_ifconf(net, argp);
3126 case SIOCETHTOOL:
3127 return ethtool_ioctl(net, argp);
3128 case SIOCWANDEV:
3129 return compat_siocwandev(net, argp);
3130 case SIOCGIFMAP:
3131 case SIOCSIFMAP:
3132 return compat_sioc_ifmap(net, cmd, argp);
3133 case SIOCBONDENSLAVE:
3134 case SIOCBONDRELEASE:
3135 case SIOCBONDSETHWADDR:
3136 case SIOCBONDSLAVEINFOQUERY:
3137 case SIOCBONDINFOQUERY:
3138 case SIOCBONDCHANGEACTIVE:
3139 return bond_ioctl(net, cmd, argp);
3140 case SIOCADDRT:
3141 case SIOCDELRT:
3142 return routing_ioctl(net, sock, cmd, argp);
3143 case SIOCGSTAMP:
3144 return do_siocgstamp(net, sock, cmd, argp);
3145 case SIOCGSTAMPNS:
3146 return do_siocgstampns(net, sock, cmd, argp);
3147 case SIOCSHWTSTAMP:
3148 return compat_siocshwtstamp(net, argp);
3150 case FIOSETOWN:
3151 case SIOCSPGRP:
3152 case FIOGETOWN:
3153 case SIOCGPGRP:
3154 case SIOCBRADDBR:
3155 case SIOCBRDELBR:
3156 case SIOCGIFVLAN:
3157 case SIOCSIFVLAN:
3158 case SIOCADDDLCI:
3159 case SIOCDELDLCI:
3160 return sock_ioctl(file, cmd, arg);
3162 case SIOCGIFFLAGS:
3163 case SIOCSIFFLAGS:
3164 case SIOCGIFMETRIC:
3165 case SIOCSIFMETRIC:
3166 case SIOCGIFMTU:
3167 case SIOCSIFMTU:
3168 case SIOCGIFMEM:
3169 case SIOCSIFMEM:
3170 case SIOCGIFHWADDR:
3171 case SIOCSIFHWADDR:
3172 case SIOCADDMULTI:
3173 case SIOCDELMULTI:
3174 case SIOCGIFINDEX:
3175 case SIOCGIFADDR:
3176 case SIOCSIFADDR:
3177 case SIOCSIFHWBROADCAST:
3178 case SIOCDIFADDR:
3179 case SIOCGIFBRDADDR:
3180 case SIOCSIFBRDADDR:
3181 case SIOCGIFDSTADDR:
3182 case SIOCSIFDSTADDR:
3183 case SIOCGIFNETMASK:
3184 case SIOCSIFNETMASK:
3185 case SIOCSIFPFLAGS:
3186 case SIOCGIFPFLAGS:
3187 case SIOCGIFTXQLEN:
3188 case SIOCSIFTXQLEN:
3189 case SIOCBRADDIF:
3190 case SIOCBRDELIF:
3191 case SIOCSIFNAME:
3192 case SIOCGMIIPHY:
3193 case SIOCGMIIREG:
3194 case SIOCSMIIREG:
3195 return dev_ifsioc(net, sock, cmd, argp);
3197 case SIOCSARP:
3198 case SIOCGARP:
3199 case SIOCDARP:
3200 case SIOCATMARK:
3201 return sock_do_ioctl(net, sock, cmd, arg);
3204 /* Prevent warning from compat_sys_ioctl, these always
3205 * result in -EINVAL in the native case anyway. */
3206 switch (cmd) {
3207 case SIOCRTMSG:
3208 case SIOCGIFCOUNT:
3209 case SIOCSRARP:
3210 case SIOCGRARP:
3211 case SIOCDRARP:
3212 case SIOCSIFLINK:
3213 case SIOCGIFSLAVE:
3214 case SIOCSIFSLAVE:
3215 return -EINVAL;
3218 return -ENOIOCTLCMD;
3221 static long compat_sock_ioctl(struct file *file, unsigned cmd,
3222 unsigned long arg)
3224 struct socket *sock = file->private_data;
3225 int ret = -ENOIOCTLCMD;
3226 struct sock *sk;
3227 struct net *net;
3229 sk = sock->sk;
3230 net = sock_net(sk);
3232 if (sock->ops->compat_ioctl)
3233 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3235 if (ret == -ENOIOCTLCMD &&
3236 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3237 ret = compat_wext_handle_ioctl(net, cmd, arg);
3239 if (ret == -ENOIOCTLCMD)
3240 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3242 return ret;
3244 #endif
3246 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3248 return sock->ops->bind(sock, addr, addrlen);
3250 EXPORT_SYMBOL(kernel_bind);
3252 int kernel_listen(struct socket *sock, int backlog)
3254 return sock->ops->listen(sock, backlog);
3256 EXPORT_SYMBOL(kernel_listen);
3258 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3260 struct sock *sk = sock->sk;
3261 int err;
3263 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3264 newsock);
3265 if (err < 0)
3266 goto done;
3268 err = sock->ops->accept(sock, *newsock, flags);
3269 if (err < 0) {
3270 sock_release(*newsock);
3271 *newsock = NULL;
3272 goto done;
3275 (*newsock)->ops = sock->ops;
3276 __module_get((*newsock)->ops->owner);
3278 done:
3279 return err;
3281 EXPORT_SYMBOL(kernel_accept);
3283 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3284 int flags)
3286 return sock->ops->connect(sock, addr, addrlen, flags);
3288 EXPORT_SYMBOL(kernel_connect);
3290 int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3291 int *addrlen)
3293 return sock->ops->getname(sock, addr, addrlen, 0);
3295 EXPORT_SYMBOL(kernel_getsockname);
3297 int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3298 int *addrlen)
3300 return sock->ops->getname(sock, addr, addrlen, 1);
3302 EXPORT_SYMBOL(kernel_getpeername);
3304 int kernel_getsockopt(struct socket *sock, int level, int optname,
3305 char *optval, int *optlen)
3307 mm_segment_t oldfs = get_fs();
3308 char __user *uoptval;
3309 int __user *uoptlen;
3310 int err;
3312 uoptval = (char __user __force *) optval;
3313 uoptlen = (int __user __force *) optlen;
3315 set_fs(KERNEL_DS);
3316 if (level == SOL_SOCKET)
3317 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3318 else
3319 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3320 uoptlen);
3321 set_fs(oldfs);
3322 return err;
3324 EXPORT_SYMBOL(kernel_getsockopt);
3326 int kernel_setsockopt(struct socket *sock, int level, int optname,
3327 char *optval, unsigned int optlen)
3329 mm_segment_t oldfs = get_fs();
3330 char __user *uoptval;
3331 int err;
3333 uoptval = (char __user __force *) optval;
3335 set_fs(KERNEL_DS);
3336 if (level == SOL_SOCKET)
3337 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3338 else
3339 err = sock->ops->setsockopt(sock, level, optname, uoptval,
3340 optlen);
3341 set_fs(oldfs);
3342 return err;
3344 EXPORT_SYMBOL(kernel_setsockopt);
3346 int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3347 size_t size, int flags)
3349 sock_update_classid(sock->sk);
3351 if (sock->ops->sendpage)
3352 return sock->ops->sendpage(sock, page, offset, size, flags);
3354 return sock_no_sendpage(sock, page, offset, size, flags);
3356 EXPORT_SYMBOL(kernel_sendpage);
3358 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3360 mm_segment_t oldfs = get_fs();
3361 int err;
3363 set_fs(KERNEL_DS);
3364 err = sock->ops->ioctl(sock, cmd, arg);
3365 set_fs(oldfs);
3367 return err;
3369 EXPORT_SYMBOL(kernel_sock_ioctl);
3371 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3373 return sock->ops->shutdown(sock, how);
3375 EXPORT_SYMBOL(kernel_sock_shutdown);