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>
8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in
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
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
23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style)
24 * Jeff Uphoff : Made max number of sockets command-line
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
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
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
58 * Based upon Swansea University Computer Society NET3.039
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/if_bridge.h>
73 #include <linux/if_frad.h>
74 #include <linux/if_vlan.h>
75 #include <linux/ptp_classify.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>
91 #include <linux/xattr.h>
93 #include <asm/uaccess.h>
94 #include <asm/unistd.h>
96 #include <net/compat.h>
98 #include <net/cls_cgroup.h>
100 #include <net/sock.h>
101 #include <linux/netfilter.h>
103 #include <linux/if_tun.h>
104 #include <linux/ipv6_route.h>
105 #include <linux/route.h>
106 #include <linux/sockios.h>
107 #include <linux/atalk.h>
108 #include <net/busy_poll.h>
109 #include <linux/errqueue.h>
111 #ifdef CONFIG_NET_RX_BUSY_POLL
112 unsigned int sysctl_net_busy_read __read_mostly
;
113 unsigned int sysctl_net_busy_poll __read_mostly
;
116 static ssize_t
sock_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
);
117 static ssize_t
sock_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
);
118 static int sock_mmap(struct file
*file
, struct vm_area_struct
*vma
);
120 static int sock_close(struct inode
*inode
, struct file
*file
);
121 static unsigned int sock_poll(struct file
*file
,
122 struct poll_table_struct
*wait
);
123 static long sock_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
125 static long compat_sock_ioctl(struct file
*file
,
126 unsigned int cmd
, unsigned long arg
);
128 static int sock_fasync(int fd
, struct file
*filp
, int on
);
129 static ssize_t
sock_sendpage(struct file
*file
, struct page
*page
,
130 int offset
, size_t size
, loff_t
*ppos
, int more
);
131 static ssize_t
sock_splice_read(struct file
*file
, loff_t
*ppos
,
132 struct pipe_inode_info
*pipe
, size_t len
,
136 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
137 * in the operation structures but are done directly via the socketcall() multiplexor.
140 static const struct file_operations socket_file_ops
= {
141 .owner
= THIS_MODULE
,
143 .read
= new_sync_read
,
144 .write
= new_sync_write
,
145 .read_iter
= sock_read_iter
,
146 .write_iter
= sock_write_iter
,
148 .unlocked_ioctl
= sock_ioctl
,
150 .compat_ioctl
= compat_sock_ioctl
,
153 .release
= sock_close
,
154 .fasync
= sock_fasync
,
155 .sendpage
= sock_sendpage
,
156 .splice_write
= generic_splice_sendpage
,
157 .splice_read
= sock_splice_read
,
161 * The protocol list. Each protocol is registered in here.
164 static DEFINE_SPINLOCK(net_family_lock
);
165 static const struct net_proto_family __rcu
*net_families
[NPROTO
] __read_mostly
;
168 * Statistics counters of the socket lists
171 static DEFINE_PER_CPU(int, sockets_in_use
);
175 * Move socket addresses back and forth across the kernel/user
176 * divide and look after the messy bits.
180 * move_addr_to_kernel - copy a socket address into kernel space
181 * @uaddr: Address in user space
182 * @kaddr: Address in kernel space
183 * @ulen: Length in user space
185 * The address is copied into kernel space. If the provided address is
186 * too long an error code of -EINVAL is returned. If the copy gives
187 * invalid addresses -EFAULT is returned. On a success 0 is returned.
190 int move_addr_to_kernel(void __user
*uaddr
, int ulen
, struct sockaddr_storage
*kaddr
)
192 if (ulen
< 0 || ulen
> sizeof(struct sockaddr_storage
))
196 if (copy_from_user(kaddr
, uaddr
, ulen
))
198 return audit_sockaddr(ulen
, kaddr
);
202 * move_addr_to_user - copy an address to user space
203 * @kaddr: kernel space address
204 * @klen: length of address in kernel
205 * @uaddr: user space address
206 * @ulen: pointer to user length field
208 * The value pointed to by ulen on entry is the buffer length available.
209 * This is overwritten with the buffer space used. -EINVAL is returned
210 * if an overlong buffer is specified or a negative buffer size. -EFAULT
211 * is returned if either the buffer or the length field are not
213 * After copying the data up to the limit the user specifies, the true
214 * length of the data is written over the length limit the user
215 * specified. Zero is returned for a success.
218 static int move_addr_to_user(struct sockaddr_storage
*kaddr
, int klen
,
219 void __user
*uaddr
, int __user
*ulen
)
224 BUG_ON(klen
> sizeof(struct sockaddr_storage
));
225 err
= get_user(len
, ulen
);
233 if (audit_sockaddr(klen
, kaddr
))
235 if (copy_to_user(uaddr
, kaddr
, len
))
239 * "fromlen shall refer to the value before truncation.."
242 return __put_user(klen
, ulen
);
245 static struct kmem_cache
*sock_inode_cachep __read_mostly
;
247 static struct inode
*sock_alloc_inode(struct super_block
*sb
)
249 struct socket_alloc
*ei
;
250 struct socket_wq
*wq
;
252 ei
= kmem_cache_alloc(sock_inode_cachep
, GFP_KERNEL
);
255 wq
= kmalloc(sizeof(*wq
), GFP_KERNEL
);
257 kmem_cache_free(sock_inode_cachep
, ei
);
260 init_waitqueue_head(&wq
->wait
);
261 wq
->fasync_list
= NULL
;
262 RCU_INIT_POINTER(ei
->socket
.wq
, wq
);
264 ei
->socket
.state
= SS_UNCONNECTED
;
265 ei
->socket
.flags
= 0;
266 ei
->socket
.ops
= NULL
;
267 ei
->socket
.sk
= NULL
;
268 ei
->socket
.file
= NULL
;
270 return &ei
->vfs_inode
;
273 static void sock_destroy_inode(struct inode
*inode
)
275 struct socket_alloc
*ei
;
276 struct socket_wq
*wq
;
278 ei
= container_of(inode
, struct socket_alloc
, vfs_inode
);
279 wq
= rcu_dereference_protected(ei
->socket
.wq
, 1);
281 kmem_cache_free(sock_inode_cachep
, ei
);
284 static void init_once(void *foo
)
286 struct socket_alloc
*ei
= (struct socket_alloc
*)foo
;
288 inode_init_once(&ei
->vfs_inode
);
291 static int init_inodecache(void)
293 sock_inode_cachep
= kmem_cache_create("sock_inode_cache",
294 sizeof(struct socket_alloc
),
296 (SLAB_HWCACHE_ALIGN
|
297 SLAB_RECLAIM_ACCOUNT
|
300 if (sock_inode_cachep
== NULL
)
305 static const struct super_operations sockfs_ops
= {
306 .alloc_inode
= sock_alloc_inode
,
307 .destroy_inode
= sock_destroy_inode
,
308 .statfs
= simple_statfs
,
312 * sockfs_dname() is called from d_path().
314 static char *sockfs_dname(struct dentry
*dentry
, char *buffer
, int buflen
)
316 return dynamic_dname(dentry
, buffer
, buflen
, "socket:[%lu]",
317 dentry
->d_inode
->i_ino
);
320 static const struct dentry_operations sockfs_dentry_operations
= {
321 .d_dname
= sockfs_dname
,
324 static struct dentry
*sockfs_mount(struct file_system_type
*fs_type
,
325 int flags
, const char *dev_name
, void *data
)
327 return mount_pseudo(fs_type
, "socket:", &sockfs_ops
,
328 &sockfs_dentry_operations
, SOCKFS_MAGIC
);
331 static struct vfsmount
*sock_mnt __read_mostly
;
333 static struct file_system_type sock_fs_type
= {
335 .mount
= sockfs_mount
,
336 .kill_sb
= kill_anon_super
,
340 * Obtains the first available file descriptor and sets it up for use.
342 * These functions create file structures and maps them to fd space
343 * of the current process. On success it returns file descriptor
344 * and file struct implicitly stored in sock->file.
345 * Note that another thread may close file descriptor before we return
346 * from this function. We use the fact that now we do not refer
347 * to socket after mapping. If one day we will need it, this
348 * function will increment ref. count on file by 1.
350 * In any case returned fd MAY BE not valid!
351 * This race condition is unavoidable
352 * with shared fd spaces, we cannot solve it inside kernel,
353 * but we take care of internal coherence yet.
356 struct file
*sock_alloc_file(struct socket
*sock
, int flags
, const char *dname
)
358 struct qstr name
= { .name
= "" };
364 name
.len
= strlen(name
.name
);
365 } else if (sock
->sk
) {
366 name
.name
= sock
->sk
->sk_prot_creator
->name
;
367 name
.len
= strlen(name
.name
);
369 path
.dentry
= d_alloc_pseudo(sock_mnt
->mnt_sb
, &name
);
370 if (unlikely(!path
.dentry
))
371 return ERR_PTR(-ENOMEM
);
372 path
.mnt
= mntget(sock_mnt
);
374 d_instantiate(path
.dentry
, SOCK_INODE(sock
));
376 file
= alloc_file(&path
, FMODE_READ
| FMODE_WRITE
,
378 if (unlikely(IS_ERR(file
))) {
379 /* drop dentry, keep inode */
380 ihold(path
.dentry
->d_inode
);
386 file
->f_flags
= O_RDWR
| (flags
& O_NONBLOCK
);
387 file
->private_data
= sock
;
390 EXPORT_SYMBOL(sock_alloc_file
);
392 static int sock_map_fd(struct socket
*sock
, int flags
)
394 struct file
*newfile
;
395 int fd
= get_unused_fd_flags(flags
);
396 if (unlikely(fd
< 0))
399 newfile
= sock_alloc_file(sock
, flags
, NULL
);
400 if (likely(!IS_ERR(newfile
))) {
401 fd_install(fd
, newfile
);
406 return PTR_ERR(newfile
);
409 struct socket
*sock_from_file(struct file
*file
, int *err
)
411 if (file
->f_op
== &socket_file_ops
)
412 return file
->private_data
; /* set in sock_map_fd */
417 EXPORT_SYMBOL(sock_from_file
);
420 * sockfd_lookup - Go from a file number to its socket slot
422 * @err: pointer to an error code return
424 * The file handle passed in is locked and the socket it is bound
425 * too is returned. If an error occurs the err pointer is overwritten
426 * with a negative errno code and NULL is returned. The function checks
427 * for both invalid handles and passing a handle which is not a socket.
429 * On a success the socket object pointer is returned.
432 struct socket
*sockfd_lookup(int fd
, int *err
)
443 sock
= sock_from_file(file
, err
);
448 EXPORT_SYMBOL(sockfd_lookup
);
450 static struct socket
*sockfd_lookup_light(int fd
, int *err
, int *fput_needed
)
452 struct fd f
= fdget(fd
);
457 sock
= sock_from_file(f
.file
, err
);
459 *fput_needed
= f
.flags
;
467 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
468 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
469 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
470 static ssize_t
sockfs_getxattr(struct dentry
*dentry
,
471 const char *name
, void *value
, size_t size
)
473 const char *proto_name
;
478 if (!strncmp(name
, XATTR_NAME_SOCKPROTONAME
, XATTR_NAME_SOCKPROTONAME_LEN
)) {
479 proto_name
= dentry
->d_name
.name
;
480 proto_size
= strlen(proto_name
);
484 if (proto_size
+ 1 > size
)
487 strncpy(value
, proto_name
, proto_size
+ 1);
489 error
= proto_size
+ 1;
496 static ssize_t
sockfs_listxattr(struct dentry
*dentry
, char *buffer
,
502 len
= security_inode_listsecurity(dentry
->d_inode
, buffer
, size
);
512 len
= (XATTR_NAME_SOCKPROTONAME_LEN
+ 1);
517 memcpy(buffer
, XATTR_NAME_SOCKPROTONAME
, len
);
524 static const struct inode_operations sockfs_inode_ops
= {
525 .getxattr
= sockfs_getxattr
,
526 .listxattr
= sockfs_listxattr
,
530 * sock_alloc - allocate a socket
532 * Allocate a new inode and socket object. The two are bound together
533 * and initialised. The socket is then returned. If we are out of inodes
537 static struct socket
*sock_alloc(void)
542 inode
= new_inode_pseudo(sock_mnt
->mnt_sb
);
546 sock
= SOCKET_I(inode
);
548 kmemcheck_annotate_bitfield(sock
, type
);
549 inode
->i_ino
= get_next_ino();
550 inode
->i_mode
= S_IFSOCK
| S_IRWXUGO
;
551 inode
->i_uid
= current_fsuid();
552 inode
->i_gid
= current_fsgid();
553 inode
->i_op
= &sockfs_inode_ops
;
555 this_cpu_add(sockets_in_use
, 1);
560 * sock_release - close a socket
561 * @sock: socket to close
563 * The socket is released from the protocol stack if it has a release
564 * callback, and the inode is then released if the socket is bound to
565 * an inode not a file.
568 void sock_release(struct socket
*sock
)
571 struct module
*owner
= sock
->ops
->owner
;
573 sock
->ops
->release(sock
);
578 if (rcu_dereference_protected(sock
->wq
, 1)->fasync_list
)
579 pr_err("%s: fasync list not empty!\n", __func__
);
581 if (test_bit(SOCK_EXTERNALLY_ALLOCATED
, &sock
->flags
))
584 this_cpu_sub(sockets_in_use
, 1);
586 iput(SOCK_INODE(sock
));
591 EXPORT_SYMBOL(sock_release
);
593 void __sock_tx_timestamp(const struct sock
*sk
, __u8
*tx_flags
)
595 u8 flags
= *tx_flags
;
597 if (sk
->sk_tsflags
& SOF_TIMESTAMPING_TX_HARDWARE
)
598 flags
|= SKBTX_HW_TSTAMP
;
600 if (sk
->sk_tsflags
& SOF_TIMESTAMPING_TX_SOFTWARE
)
601 flags
|= SKBTX_SW_TSTAMP
;
603 if (sk
->sk_tsflags
& SOF_TIMESTAMPING_TX_SCHED
)
604 flags
|= SKBTX_SCHED_TSTAMP
;
606 if (sk
->sk_tsflags
& SOF_TIMESTAMPING_TX_ACK
)
607 flags
|= SKBTX_ACK_TSTAMP
;
611 EXPORT_SYMBOL(__sock_tx_timestamp
);
613 static inline int sock_sendmsg_nosec(struct socket
*sock
, struct msghdr
*msg
,
616 return sock
->ops
->sendmsg(sock
, msg
, size
);
619 int sock_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
)
621 int err
= security_socket_sendmsg(sock
, msg
, size
);
623 return err
?: sock_sendmsg_nosec(sock
, msg
, size
);
625 EXPORT_SYMBOL(sock_sendmsg
);
627 int kernel_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
628 struct kvec
*vec
, size_t num
, size_t size
)
630 mm_segment_t oldfs
= get_fs();
635 * the following is safe, since for compiler definitions of kvec and
636 * iovec are identical, yielding the same in-core layout and alignment
638 iov_iter_init(&msg
->msg_iter
, WRITE
, (struct iovec
*)vec
, num
, size
);
639 result
= sock_sendmsg(sock
, msg
, size
);
643 EXPORT_SYMBOL(kernel_sendmsg
);
646 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
648 void __sock_recv_timestamp(struct msghdr
*msg
, struct sock
*sk
,
651 int need_software_tstamp
= sock_flag(sk
, SOCK_RCVTSTAMP
);
652 struct scm_timestamping tss
;
654 struct skb_shared_hwtstamps
*shhwtstamps
=
657 /* Race occurred between timestamp enabling and packet
658 receiving. Fill in the current time for now. */
659 if (need_software_tstamp
&& skb
->tstamp
.tv64
== 0)
660 __net_timestamp(skb
);
662 if (need_software_tstamp
) {
663 if (!sock_flag(sk
, SOCK_RCVTSTAMPNS
)) {
665 skb_get_timestamp(skb
, &tv
);
666 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMP
,
670 skb_get_timestampns(skb
, &ts
);
671 put_cmsg(msg
, SOL_SOCKET
, SCM_TIMESTAMPNS
,
676 memset(&tss
, 0, sizeof(tss
));
677 if ((sk
->sk_tsflags
& SOF_TIMESTAMPING_SOFTWARE
) &&
678 ktime_to_timespec_cond(skb
->tstamp
, tss
.ts
+ 0))
681 (sk
->sk_tsflags
& SOF_TIMESTAMPING_RAW_HARDWARE
) &&
682 ktime_to_timespec_cond(shhwtstamps
->hwtstamp
, tss
.ts
+ 2))
685 put_cmsg(msg
, SOL_SOCKET
,
686 SCM_TIMESTAMPING
, sizeof(tss
), &tss
);
688 EXPORT_SYMBOL_GPL(__sock_recv_timestamp
);
690 void __sock_recv_wifi_status(struct msghdr
*msg
, struct sock
*sk
,
695 if (!sock_flag(sk
, SOCK_WIFI_STATUS
))
697 if (!skb
->wifi_acked_valid
)
700 ack
= skb
->wifi_acked
;
702 put_cmsg(msg
, SOL_SOCKET
, SCM_WIFI_STATUS
, sizeof(ack
), &ack
);
704 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status
);
706 static inline void sock_recv_drops(struct msghdr
*msg
, struct sock
*sk
,
709 if (sock_flag(sk
, SOCK_RXQ_OVFL
) && skb
&& SOCK_SKB_CB(skb
)->dropcount
)
710 put_cmsg(msg
, SOL_SOCKET
, SO_RXQ_OVFL
,
711 sizeof(__u32
), &SOCK_SKB_CB(skb
)->dropcount
);
714 void __sock_recv_ts_and_drops(struct msghdr
*msg
, struct sock
*sk
,
717 sock_recv_timestamp(msg
, sk
, skb
);
718 sock_recv_drops(msg
, sk
, skb
);
720 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops
);
722 static inline int sock_recvmsg_nosec(struct socket
*sock
, struct msghdr
*msg
,
723 size_t size
, int flags
)
725 return sock
->ops
->recvmsg(sock
, msg
, size
, flags
);
728 int sock_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
731 int err
= security_socket_recvmsg(sock
, msg
, size
, flags
);
733 return err
?: sock_recvmsg_nosec(sock
, msg
, size
, flags
);
735 EXPORT_SYMBOL(sock_recvmsg
);
738 * kernel_recvmsg - Receive a message from a socket (kernel space)
739 * @sock: The socket to receive the message from
740 * @msg: Received message
741 * @vec: Input s/g array for message data
742 * @num: Size of input s/g array
743 * @size: Number of bytes to read
744 * @flags: Message flags (MSG_DONTWAIT, etc...)
746 * On return the msg structure contains the scatter/gather array passed in the
747 * vec argument. The array is modified so that it consists of the unfilled
748 * portion of the original array.
750 * The returned value is the total number of bytes received, or an error.
752 int kernel_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
753 struct kvec
*vec
, size_t num
, size_t size
, int flags
)
755 mm_segment_t oldfs
= get_fs();
760 * the following is safe, since for compiler definitions of kvec and
761 * iovec are identical, yielding the same in-core layout and alignment
763 iov_iter_init(&msg
->msg_iter
, READ
, (struct iovec
*)vec
, num
, size
);
764 result
= sock_recvmsg(sock
, msg
, size
, flags
);
768 EXPORT_SYMBOL(kernel_recvmsg
);
770 static ssize_t
sock_sendpage(struct file
*file
, struct page
*page
,
771 int offset
, size_t size
, loff_t
*ppos
, int more
)
776 sock
= file
->private_data
;
778 flags
= (file
->f_flags
& O_NONBLOCK
) ? MSG_DONTWAIT
: 0;
779 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
782 return kernel_sendpage(sock
, page
, offset
, size
, flags
);
785 static ssize_t
sock_splice_read(struct file
*file
, loff_t
*ppos
,
786 struct pipe_inode_info
*pipe
, size_t len
,
789 struct socket
*sock
= file
->private_data
;
791 if (unlikely(!sock
->ops
->splice_read
))
794 return sock
->ops
->splice_read(sock
, ppos
, pipe
, len
, flags
);
797 static ssize_t
sock_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
)
799 struct file
*file
= iocb
->ki_filp
;
800 struct socket
*sock
= file
->private_data
;
801 struct msghdr msg
= {.msg_iter
= *to
};
804 if (file
->f_flags
& O_NONBLOCK
)
805 msg
.msg_flags
= MSG_DONTWAIT
;
807 if (iocb
->ki_pos
!= 0)
810 if (iocb
->ki_nbytes
== 0) /* Match SYS5 behaviour */
813 res
= sock_recvmsg(sock
, &msg
, iocb
->ki_nbytes
, msg
.msg_flags
);
818 static ssize_t
sock_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
)
820 struct file
*file
= iocb
->ki_filp
;
821 struct socket
*sock
= file
->private_data
;
822 struct msghdr msg
= {.msg_iter
= *from
};
825 if (iocb
->ki_pos
!= 0)
828 if (file
->f_flags
& O_NONBLOCK
)
829 msg
.msg_flags
= MSG_DONTWAIT
;
831 if (sock
->type
== SOCK_SEQPACKET
)
832 msg
.msg_flags
|= MSG_EOR
;
834 res
= sock_sendmsg(sock
, &msg
, iocb
->ki_nbytes
);
835 *from
= msg
.msg_iter
;
840 * Atomic setting of ioctl hooks to avoid race
841 * with module unload.
844 static DEFINE_MUTEX(br_ioctl_mutex
);
845 static int (*br_ioctl_hook
) (struct net
*, unsigned int cmd
, void __user
*arg
);
847 void brioctl_set(int (*hook
) (struct net
*, unsigned int, void __user
*))
849 mutex_lock(&br_ioctl_mutex
);
850 br_ioctl_hook
= hook
;
851 mutex_unlock(&br_ioctl_mutex
);
853 EXPORT_SYMBOL(brioctl_set
);
855 static DEFINE_MUTEX(vlan_ioctl_mutex
);
856 static int (*vlan_ioctl_hook
) (struct net
*, void __user
*arg
);
858 void vlan_ioctl_set(int (*hook
) (struct net
*, void __user
*))
860 mutex_lock(&vlan_ioctl_mutex
);
861 vlan_ioctl_hook
= hook
;
862 mutex_unlock(&vlan_ioctl_mutex
);
864 EXPORT_SYMBOL(vlan_ioctl_set
);
866 static DEFINE_MUTEX(dlci_ioctl_mutex
);
867 static int (*dlci_ioctl_hook
) (unsigned int, void __user
*);
869 void dlci_ioctl_set(int (*hook
) (unsigned int, void __user
*))
871 mutex_lock(&dlci_ioctl_mutex
);
872 dlci_ioctl_hook
= hook
;
873 mutex_unlock(&dlci_ioctl_mutex
);
875 EXPORT_SYMBOL(dlci_ioctl_set
);
877 static long sock_do_ioctl(struct net
*net
, struct socket
*sock
,
878 unsigned int cmd
, unsigned long arg
)
881 void __user
*argp
= (void __user
*)arg
;
883 err
= sock
->ops
->ioctl(sock
, cmd
, arg
);
886 * If this ioctl is unknown try to hand it down
889 if (err
== -ENOIOCTLCMD
)
890 err
= dev_ioctl(net
, cmd
, argp
);
896 * With an ioctl, arg may well be a user mode pointer, but we don't know
897 * what to do with it - that's up to the protocol still.
900 static long sock_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
)
904 void __user
*argp
= (void __user
*)arg
;
908 sock
= file
->private_data
;
911 if (cmd
>= SIOCDEVPRIVATE
&& cmd
<= (SIOCDEVPRIVATE
+ 15)) {
912 err
= dev_ioctl(net
, cmd
, argp
);
914 #ifdef CONFIG_WEXT_CORE
915 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
) {
916 err
= dev_ioctl(net
, cmd
, argp
);
923 if (get_user(pid
, (int __user
*)argp
))
925 f_setown(sock
->file
, pid
, 1);
930 err
= put_user(f_getown(sock
->file
),
939 request_module("bridge");
941 mutex_lock(&br_ioctl_mutex
);
943 err
= br_ioctl_hook(net
, cmd
, argp
);
944 mutex_unlock(&br_ioctl_mutex
);
949 if (!vlan_ioctl_hook
)
950 request_module("8021q");
952 mutex_lock(&vlan_ioctl_mutex
);
954 err
= vlan_ioctl_hook(net
, argp
);
955 mutex_unlock(&vlan_ioctl_mutex
);
960 if (!dlci_ioctl_hook
)
961 request_module("dlci");
963 mutex_lock(&dlci_ioctl_mutex
);
965 err
= dlci_ioctl_hook(cmd
, argp
);
966 mutex_unlock(&dlci_ioctl_mutex
);
969 err
= sock_do_ioctl(net
, sock
, cmd
, arg
);
975 int sock_create_lite(int family
, int type
, int protocol
, struct socket
**res
)
978 struct socket
*sock
= NULL
;
980 err
= security_socket_create(family
, type
, protocol
, 1);
991 err
= security_socket_post_create(sock
, family
, type
, protocol
, 1);
1003 EXPORT_SYMBOL(sock_create_lite
);
1005 /* No kernel lock held - perfect */
1006 static unsigned int sock_poll(struct file
*file
, poll_table
*wait
)
1008 unsigned int busy_flag
= 0;
1009 struct socket
*sock
;
1012 * We can't return errors to poll, so it's either yes or no.
1014 sock
= file
->private_data
;
1016 if (sk_can_busy_loop(sock
->sk
)) {
1017 /* this socket can poll_ll so tell the system call */
1018 busy_flag
= POLL_BUSY_LOOP
;
1020 /* once, only if requested by syscall */
1021 if (wait
&& (wait
->_key
& POLL_BUSY_LOOP
))
1022 sk_busy_loop(sock
->sk
, 1);
1025 return busy_flag
| sock
->ops
->poll(file
, sock
, wait
);
1028 static int sock_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1030 struct socket
*sock
= file
->private_data
;
1032 return sock
->ops
->mmap(file
, sock
, vma
);
1035 static int sock_close(struct inode
*inode
, struct file
*filp
)
1037 sock_release(SOCKET_I(inode
));
1042 * Update the socket async list
1044 * Fasync_list locking strategy.
1046 * 1. fasync_list is modified only under process context socket lock
1047 * i.e. under semaphore.
1048 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1049 * or under socket lock
1052 static int sock_fasync(int fd
, struct file
*filp
, int on
)
1054 struct socket
*sock
= filp
->private_data
;
1055 struct sock
*sk
= sock
->sk
;
1056 struct socket_wq
*wq
;
1062 wq
= rcu_dereference_protected(sock
->wq
, sock_owned_by_user(sk
));
1063 fasync_helper(fd
, filp
, on
, &wq
->fasync_list
);
1065 if (!wq
->fasync_list
)
1066 sock_reset_flag(sk
, SOCK_FASYNC
);
1068 sock_set_flag(sk
, SOCK_FASYNC
);
1074 /* This function may be called only under socket lock or callback_lock or rcu_lock */
1076 int sock_wake_async(struct socket
*sock
, int how
, int band
)
1078 struct socket_wq
*wq
;
1083 wq
= rcu_dereference(sock
->wq
);
1084 if (!wq
|| !wq
->fasync_list
) {
1089 case SOCK_WAKE_WAITD
:
1090 if (test_bit(SOCK_ASYNC_WAITDATA
, &sock
->flags
))
1093 case SOCK_WAKE_SPACE
:
1094 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
))
1099 kill_fasync(&wq
->fasync_list
, SIGIO
, band
);
1102 kill_fasync(&wq
->fasync_list
, SIGURG
, band
);
1107 EXPORT_SYMBOL(sock_wake_async
);
1109 int __sock_create(struct net
*net
, int family
, int type
, int protocol
,
1110 struct socket
**res
, int kern
)
1113 struct socket
*sock
;
1114 const struct net_proto_family
*pf
;
1117 * Check protocol is in range
1119 if (family
< 0 || family
>= NPROTO
)
1120 return -EAFNOSUPPORT
;
1121 if (type
< 0 || type
>= SOCK_MAX
)
1126 This uglymoron is moved from INET layer to here to avoid
1127 deadlock in module load.
1129 if (family
== PF_INET
&& type
== SOCK_PACKET
) {
1133 pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1139 err
= security_socket_create(family
, type
, protocol
, kern
);
1144 * Allocate the socket and allow the family to set things up. if
1145 * the protocol is 0, the family is instructed to select an appropriate
1148 sock
= sock_alloc();
1150 net_warn_ratelimited("socket: no more sockets\n");
1151 return -ENFILE
; /* Not exactly a match, but its the
1152 closest posix thing */
1157 #ifdef CONFIG_MODULES
1158 /* Attempt to load a protocol module if the find failed.
1160 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1161 * requested real, full-featured networking support upon configuration.
1162 * Otherwise module support will break!
1164 if (rcu_access_pointer(net_families
[family
]) == NULL
)
1165 request_module("net-pf-%d", family
);
1169 pf
= rcu_dereference(net_families
[family
]);
1170 err
= -EAFNOSUPPORT
;
1175 * We will call the ->create function, that possibly is in a loadable
1176 * module, so we have to bump that loadable module refcnt first.
1178 if (!try_module_get(pf
->owner
))
1181 /* Now protected by module ref count */
1184 err
= pf
->create(net
, sock
, protocol
, kern
);
1186 goto out_module_put
;
1189 * Now to bump the refcnt of the [loadable] module that owns this
1190 * socket at sock_release time we decrement its refcnt.
1192 if (!try_module_get(sock
->ops
->owner
))
1193 goto out_module_busy
;
1196 * Now that we're done with the ->create function, the [loadable]
1197 * module can have its refcnt decremented
1199 module_put(pf
->owner
);
1200 err
= security_socket_post_create(sock
, family
, type
, protocol
, kern
);
1202 goto out_sock_release
;
1208 err
= -EAFNOSUPPORT
;
1211 module_put(pf
->owner
);
1218 goto out_sock_release
;
1220 EXPORT_SYMBOL(__sock_create
);
1222 int sock_create(int family
, int type
, int protocol
, struct socket
**res
)
1224 return __sock_create(current
->nsproxy
->net_ns
, family
, type
, protocol
, res
, 0);
1226 EXPORT_SYMBOL(sock_create
);
1228 int sock_create_kern(int family
, int type
, int protocol
, struct socket
**res
)
1230 return __sock_create(&init_net
, family
, type
, protocol
, res
, 1);
1232 EXPORT_SYMBOL(sock_create_kern
);
1234 SYSCALL_DEFINE3(socket
, int, family
, int, type
, int, protocol
)
1237 struct socket
*sock
;
1240 /* Check the SOCK_* constants for consistency. */
1241 BUILD_BUG_ON(SOCK_CLOEXEC
!= O_CLOEXEC
);
1242 BUILD_BUG_ON((SOCK_MAX
| SOCK_TYPE_MASK
) != SOCK_TYPE_MASK
);
1243 BUILD_BUG_ON(SOCK_CLOEXEC
& SOCK_TYPE_MASK
);
1244 BUILD_BUG_ON(SOCK_NONBLOCK
& SOCK_TYPE_MASK
);
1246 flags
= type
& ~SOCK_TYPE_MASK
;
1247 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1249 type
&= SOCK_TYPE_MASK
;
1251 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1252 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1254 retval
= sock_create(family
, type
, protocol
, &sock
);
1258 retval
= sock_map_fd(sock
, flags
& (O_CLOEXEC
| O_NONBLOCK
));
1263 /* It may be already another descriptor 8) Not kernel problem. */
1272 * Create a pair of connected sockets.
1275 SYSCALL_DEFINE4(socketpair
, int, family
, int, type
, int, protocol
,
1276 int __user
*, usockvec
)
1278 struct socket
*sock1
, *sock2
;
1280 struct file
*newfile1
, *newfile2
;
1283 flags
= type
& ~SOCK_TYPE_MASK
;
1284 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1286 type
&= SOCK_TYPE_MASK
;
1288 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1289 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1292 * Obtain the first socket and check if the underlying protocol
1293 * supports the socketpair call.
1296 err
= sock_create(family
, type
, protocol
, &sock1
);
1300 err
= sock_create(family
, type
, protocol
, &sock2
);
1304 err
= sock1
->ops
->socketpair(sock1
, sock2
);
1306 goto out_release_both
;
1308 fd1
= get_unused_fd_flags(flags
);
1309 if (unlikely(fd1
< 0)) {
1311 goto out_release_both
;
1314 fd2
= get_unused_fd_flags(flags
);
1315 if (unlikely(fd2
< 0)) {
1317 goto out_put_unused_1
;
1320 newfile1
= sock_alloc_file(sock1
, flags
, NULL
);
1321 if (unlikely(IS_ERR(newfile1
))) {
1322 err
= PTR_ERR(newfile1
);
1323 goto out_put_unused_both
;
1326 newfile2
= sock_alloc_file(sock2
, flags
, NULL
);
1327 if (IS_ERR(newfile2
)) {
1328 err
= PTR_ERR(newfile2
);
1332 err
= put_user(fd1
, &usockvec
[0]);
1336 err
= put_user(fd2
, &usockvec
[1]);
1340 audit_fd_pair(fd1
, fd2
);
1342 fd_install(fd1
, newfile1
);
1343 fd_install(fd2
, newfile2
);
1344 /* fd1 and fd2 may be already another descriptors.
1345 * Not kernel problem.
1361 sock_release(sock2
);
1364 out_put_unused_both
:
1369 sock_release(sock2
);
1371 sock_release(sock1
);
1377 * Bind a name to a socket. Nothing much to do here since it's
1378 * the protocol's responsibility to handle the local address.
1380 * We move the socket address to kernel space before we call
1381 * the protocol layer (having also checked the address is ok).
1384 SYSCALL_DEFINE3(bind
, int, fd
, struct sockaddr __user
*, umyaddr
, int, addrlen
)
1386 struct socket
*sock
;
1387 struct sockaddr_storage address
;
1388 int err
, fput_needed
;
1390 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1392 err
= move_addr_to_kernel(umyaddr
, addrlen
, &address
);
1394 err
= security_socket_bind(sock
,
1395 (struct sockaddr
*)&address
,
1398 err
= sock
->ops
->bind(sock
,
1402 fput_light(sock
->file
, fput_needed
);
1408 * Perform a listen. Basically, we allow the protocol to do anything
1409 * necessary for a listen, and if that works, we mark the socket as
1410 * ready for listening.
1413 SYSCALL_DEFINE2(listen
, int, fd
, int, backlog
)
1415 struct socket
*sock
;
1416 int err
, fput_needed
;
1419 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1421 somaxconn
= sock_net(sock
->sk
)->core
.sysctl_somaxconn
;
1422 if ((unsigned int)backlog
> somaxconn
)
1423 backlog
= somaxconn
;
1425 err
= security_socket_listen(sock
, backlog
);
1427 err
= sock
->ops
->listen(sock
, backlog
);
1429 fput_light(sock
->file
, fput_needed
);
1435 * For accept, we attempt to create a new socket, set up the link
1436 * with the client, wake up the client, then return the new
1437 * connected fd. We collect the address of the connector in kernel
1438 * space and move it to user at the very end. This is unclean because
1439 * we open the socket then return an error.
1441 * 1003.1g adds the ability to recvmsg() to query connection pending
1442 * status to recvmsg. We need to add that support in a way thats
1443 * clean when we restucture accept also.
1446 SYSCALL_DEFINE4(accept4
, int, fd
, struct sockaddr __user
*, upeer_sockaddr
,
1447 int __user
*, upeer_addrlen
, int, flags
)
1449 struct socket
*sock
, *newsock
;
1450 struct file
*newfile
;
1451 int err
, len
, newfd
, fput_needed
;
1452 struct sockaddr_storage address
;
1454 if (flags
& ~(SOCK_CLOEXEC
| SOCK_NONBLOCK
))
1457 if (SOCK_NONBLOCK
!= O_NONBLOCK
&& (flags
& SOCK_NONBLOCK
))
1458 flags
= (flags
& ~SOCK_NONBLOCK
) | O_NONBLOCK
;
1460 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1465 newsock
= sock_alloc();
1469 newsock
->type
= sock
->type
;
1470 newsock
->ops
= sock
->ops
;
1473 * We don't need try_module_get here, as the listening socket (sock)
1474 * has the protocol module (sock->ops->owner) held.
1476 __module_get(newsock
->ops
->owner
);
1478 newfd
= get_unused_fd_flags(flags
);
1479 if (unlikely(newfd
< 0)) {
1481 sock_release(newsock
);
1484 newfile
= sock_alloc_file(newsock
, flags
, sock
->sk
->sk_prot_creator
->name
);
1485 if (unlikely(IS_ERR(newfile
))) {
1486 err
= PTR_ERR(newfile
);
1487 put_unused_fd(newfd
);
1488 sock_release(newsock
);
1492 err
= security_socket_accept(sock
, newsock
);
1496 err
= sock
->ops
->accept(sock
, newsock
, sock
->file
->f_flags
);
1500 if (upeer_sockaddr
) {
1501 if (newsock
->ops
->getname(newsock
, (struct sockaddr
*)&address
,
1503 err
= -ECONNABORTED
;
1506 err
= move_addr_to_user(&address
,
1507 len
, upeer_sockaddr
, upeer_addrlen
);
1512 /* File flags are not inherited via accept() unlike another OSes. */
1514 fd_install(newfd
, newfile
);
1518 fput_light(sock
->file
, fput_needed
);
1523 put_unused_fd(newfd
);
1527 SYSCALL_DEFINE3(accept
, int, fd
, struct sockaddr __user
*, upeer_sockaddr
,
1528 int __user
*, upeer_addrlen
)
1530 return sys_accept4(fd
, upeer_sockaddr
, upeer_addrlen
, 0);
1534 * Attempt to connect to a socket with the server address. The address
1535 * is in user space so we verify it is OK and move it to kernel space.
1537 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1540 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1541 * other SEQPACKET protocols that take time to connect() as it doesn't
1542 * include the -EINPROGRESS status for such sockets.
1545 SYSCALL_DEFINE3(connect
, int, fd
, struct sockaddr __user
*, uservaddr
,
1548 struct socket
*sock
;
1549 struct sockaddr_storage address
;
1550 int err
, fput_needed
;
1552 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1555 err
= move_addr_to_kernel(uservaddr
, addrlen
, &address
);
1560 security_socket_connect(sock
, (struct sockaddr
*)&address
, addrlen
);
1564 err
= sock
->ops
->connect(sock
, (struct sockaddr
*)&address
, addrlen
,
1565 sock
->file
->f_flags
);
1567 fput_light(sock
->file
, fput_needed
);
1573 * Get the local address ('name') of a socket object. Move the obtained
1574 * name to user space.
1577 SYSCALL_DEFINE3(getsockname
, int, fd
, struct sockaddr __user
*, usockaddr
,
1578 int __user
*, usockaddr_len
)
1580 struct socket
*sock
;
1581 struct sockaddr_storage address
;
1582 int len
, err
, fput_needed
;
1584 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1588 err
= security_socket_getsockname(sock
);
1592 err
= sock
->ops
->getname(sock
, (struct sockaddr
*)&address
, &len
, 0);
1595 err
= move_addr_to_user(&address
, len
, usockaddr
, usockaddr_len
);
1598 fput_light(sock
->file
, fput_needed
);
1604 * Get the remote address ('name') of a socket object. Move the obtained
1605 * name to user space.
1608 SYSCALL_DEFINE3(getpeername
, int, fd
, struct sockaddr __user
*, usockaddr
,
1609 int __user
*, usockaddr_len
)
1611 struct socket
*sock
;
1612 struct sockaddr_storage address
;
1613 int len
, err
, fput_needed
;
1615 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1617 err
= security_socket_getpeername(sock
);
1619 fput_light(sock
->file
, fput_needed
);
1624 sock
->ops
->getname(sock
, (struct sockaddr
*)&address
, &len
,
1627 err
= move_addr_to_user(&address
, len
, usockaddr
,
1629 fput_light(sock
->file
, fput_needed
);
1635 * Send a datagram to a given address. We move the address into kernel
1636 * space and check the user space data area is readable before invoking
1640 SYSCALL_DEFINE6(sendto
, int, fd
, void __user
*, buff
, size_t, len
,
1641 unsigned int, flags
, struct sockaddr __user
*, addr
,
1644 struct socket
*sock
;
1645 struct sockaddr_storage address
;
1653 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1657 iov
.iov_base
= buff
;
1659 msg
.msg_name
= NULL
;
1660 iov_iter_init(&msg
.msg_iter
, WRITE
, &iov
, 1, len
);
1661 msg
.msg_control
= NULL
;
1662 msg
.msg_controllen
= 0;
1663 msg
.msg_namelen
= 0;
1665 err
= move_addr_to_kernel(addr
, addr_len
, &address
);
1668 msg
.msg_name
= (struct sockaddr
*)&address
;
1669 msg
.msg_namelen
= addr_len
;
1671 if (sock
->file
->f_flags
& O_NONBLOCK
)
1672 flags
|= MSG_DONTWAIT
;
1673 msg
.msg_flags
= flags
;
1674 err
= sock_sendmsg(sock
, &msg
, len
);
1677 fput_light(sock
->file
, fput_needed
);
1683 * Send a datagram down a socket.
1686 SYSCALL_DEFINE4(send
, int, fd
, void __user
*, buff
, size_t, len
,
1687 unsigned int, flags
)
1689 return sys_sendto(fd
, buff
, len
, flags
, NULL
, 0);
1693 * Receive a frame from the socket and optionally record the address of the
1694 * sender. We verify the buffers are writable and if needed move the
1695 * sender address from kernel to user space.
1698 SYSCALL_DEFINE6(recvfrom
, int, fd
, void __user
*, ubuf
, size_t, size
,
1699 unsigned int, flags
, struct sockaddr __user
*, addr
,
1700 int __user
*, addr_len
)
1702 struct socket
*sock
;
1705 struct sockaddr_storage address
;
1711 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1715 msg
.msg_control
= NULL
;
1716 msg
.msg_controllen
= 0;
1718 iov
.iov_base
= ubuf
;
1719 iov_iter_init(&msg
.msg_iter
, READ
, &iov
, 1, size
);
1720 /* Save some cycles and don't copy the address if not needed */
1721 msg
.msg_name
= addr
? (struct sockaddr
*)&address
: NULL
;
1722 /* We assume all kernel code knows the size of sockaddr_storage */
1723 msg
.msg_namelen
= 0;
1724 if (sock
->file
->f_flags
& O_NONBLOCK
)
1725 flags
|= MSG_DONTWAIT
;
1726 err
= sock_recvmsg(sock
, &msg
, size
, flags
);
1728 if (err
>= 0 && addr
!= NULL
) {
1729 err2
= move_addr_to_user(&address
,
1730 msg
.msg_namelen
, addr
, addr_len
);
1735 fput_light(sock
->file
, fput_needed
);
1741 * Receive a datagram from a socket.
1744 SYSCALL_DEFINE4(recv
, int, fd
, void __user
*, ubuf
, size_t, size
,
1745 unsigned int, flags
)
1747 return sys_recvfrom(fd
, ubuf
, size
, flags
, NULL
, NULL
);
1751 * Set a socket option. Because we don't know the option lengths we have
1752 * to pass the user mode parameter for the protocols to sort out.
1755 SYSCALL_DEFINE5(setsockopt
, int, fd
, int, level
, int, optname
,
1756 char __user
*, optval
, int, optlen
)
1758 int err
, fput_needed
;
1759 struct socket
*sock
;
1764 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1766 err
= security_socket_setsockopt(sock
, level
, optname
);
1770 if (level
== SOL_SOCKET
)
1772 sock_setsockopt(sock
, level
, optname
, optval
,
1776 sock
->ops
->setsockopt(sock
, level
, optname
, optval
,
1779 fput_light(sock
->file
, fput_needed
);
1785 * Get a socket option. Because we don't know the option lengths we have
1786 * to pass a user mode parameter for the protocols to sort out.
1789 SYSCALL_DEFINE5(getsockopt
, int, fd
, int, level
, int, optname
,
1790 char __user
*, optval
, int __user
*, optlen
)
1792 int err
, fput_needed
;
1793 struct socket
*sock
;
1795 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1797 err
= security_socket_getsockopt(sock
, level
, optname
);
1801 if (level
== SOL_SOCKET
)
1803 sock_getsockopt(sock
, level
, optname
, optval
,
1807 sock
->ops
->getsockopt(sock
, level
, optname
, optval
,
1810 fput_light(sock
->file
, fput_needed
);
1816 * Shutdown a socket.
1819 SYSCALL_DEFINE2(shutdown
, int, fd
, int, how
)
1821 int err
, fput_needed
;
1822 struct socket
*sock
;
1824 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
1826 err
= security_socket_shutdown(sock
, how
);
1828 err
= sock
->ops
->shutdown(sock
, how
);
1829 fput_light(sock
->file
, fput_needed
);
1834 /* A couple of helpful macros for getting the address of the 32/64 bit
1835 * fields which are the same type (int / unsigned) on our platforms.
1837 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1838 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1839 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1841 struct used_address
{
1842 struct sockaddr_storage name
;
1843 unsigned int name_len
;
1846 static ssize_t
copy_msghdr_from_user(struct msghdr
*kmsg
,
1847 struct user_msghdr __user
*umsg
,
1848 struct sockaddr __user
**save_addr
,
1851 struct sockaddr __user
*uaddr
;
1852 struct iovec __user
*uiov
;
1856 if (!access_ok(VERIFY_READ
, umsg
, sizeof(*umsg
)) ||
1857 __get_user(uaddr
, &umsg
->msg_name
) ||
1858 __get_user(kmsg
->msg_namelen
, &umsg
->msg_namelen
) ||
1859 __get_user(uiov
, &umsg
->msg_iov
) ||
1860 __get_user(nr_segs
, &umsg
->msg_iovlen
) ||
1861 __get_user(kmsg
->msg_control
, &umsg
->msg_control
) ||
1862 __get_user(kmsg
->msg_controllen
, &umsg
->msg_controllen
) ||
1863 __get_user(kmsg
->msg_flags
, &umsg
->msg_flags
))
1867 kmsg
->msg_namelen
= 0;
1869 if (kmsg
->msg_namelen
< 0)
1872 if (kmsg
->msg_namelen
> sizeof(struct sockaddr_storage
))
1873 kmsg
->msg_namelen
= sizeof(struct sockaddr_storage
);
1878 if (uaddr
&& kmsg
->msg_namelen
) {
1880 err
= move_addr_to_kernel(uaddr
, kmsg
->msg_namelen
,
1886 kmsg
->msg_name
= NULL
;
1887 kmsg
->msg_namelen
= 0;
1890 if (nr_segs
> UIO_MAXIOV
)
1893 err
= rw_copy_check_uvector(save_addr
? READ
: WRITE
,
1895 UIO_FASTIOV
, *iov
, iov
);
1897 iov_iter_init(&kmsg
->msg_iter
, save_addr
? READ
: WRITE
,
1898 *iov
, nr_segs
, err
);
1902 static int ___sys_sendmsg(struct socket
*sock
, struct user_msghdr __user
*msg
,
1903 struct msghdr
*msg_sys
, unsigned int flags
,
1904 struct used_address
*used_address
)
1906 struct compat_msghdr __user
*msg_compat
=
1907 (struct compat_msghdr __user
*)msg
;
1908 struct sockaddr_storage address
;
1909 struct iovec iovstack
[UIO_FASTIOV
], *iov
= iovstack
;
1910 unsigned char ctl
[sizeof(struct cmsghdr
) + 20]
1911 __attribute__ ((aligned(sizeof(__kernel_size_t
))));
1912 /* 20 is size of ipv6_pktinfo */
1913 unsigned char *ctl_buf
= ctl
;
1914 int ctl_len
, total_len
;
1917 msg_sys
->msg_name
= &address
;
1919 if (MSG_CMSG_COMPAT
& flags
)
1920 err
= get_compat_msghdr(msg_sys
, msg_compat
, NULL
, &iov
);
1922 err
= copy_msghdr_from_user(msg_sys
, msg
, NULL
, &iov
);
1929 if (msg_sys
->msg_controllen
> INT_MAX
)
1931 ctl_len
= msg_sys
->msg_controllen
;
1932 if ((MSG_CMSG_COMPAT
& flags
) && ctl_len
) {
1934 cmsghdr_from_user_compat_to_kern(msg_sys
, sock
->sk
, ctl
,
1938 ctl_buf
= msg_sys
->msg_control
;
1939 ctl_len
= msg_sys
->msg_controllen
;
1940 } else if (ctl_len
) {
1941 if (ctl_len
> sizeof(ctl
)) {
1942 ctl_buf
= sock_kmalloc(sock
->sk
, ctl_len
, GFP_KERNEL
);
1943 if (ctl_buf
== NULL
)
1948 * Careful! Before this, msg_sys->msg_control contains a user pointer.
1949 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1950 * checking falls down on this.
1952 if (copy_from_user(ctl_buf
,
1953 (void __user __force
*)msg_sys
->msg_control
,
1956 msg_sys
->msg_control
= ctl_buf
;
1958 msg_sys
->msg_flags
= flags
;
1960 if (sock
->file
->f_flags
& O_NONBLOCK
)
1961 msg_sys
->msg_flags
|= MSG_DONTWAIT
;
1963 * If this is sendmmsg() and current destination address is same as
1964 * previously succeeded address, omit asking LSM's decision.
1965 * used_address->name_len is initialized to UINT_MAX so that the first
1966 * destination address never matches.
1968 if (used_address
&& msg_sys
->msg_name
&&
1969 used_address
->name_len
== msg_sys
->msg_namelen
&&
1970 !memcmp(&used_address
->name
, msg_sys
->msg_name
,
1971 used_address
->name_len
)) {
1972 err
= sock_sendmsg_nosec(sock
, msg_sys
, total_len
);
1975 err
= sock_sendmsg(sock
, msg_sys
, total_len
);
1977 * If this is sendmmsg() and sending to current destination address was
1978 * successful, remember it.
1980 if (used_address
&& err
>= 0) {
1981 used_address
->name_len
= msg_sys
->msg_namelen
;
1982 if (msg_sys
->msg_name
)
1983 memcpy(&used_address
->name
, msg_sys
->msg_name
,
1984 used_address
->name_len
);
1989 sock_kfree_s(sock
->sk
, ctl_buf
, ctl_len
);
1991 if (iov
!= iovstack
)
1997 * BSD sendmsg interface
2000 long __sys_sendmsg(int fd
, struct user_msghdr __user
*msg
, unsigned flags
)
2002 int fput_needed
, err
;
2003 struct msghdr msg_sys
;
2004 struct socket
*sock
;
2006 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2010 err
= ___sys_sendmsg(sock
, msg
, &msg_sys
, flags
, NULL
);
2012 fput_light(sock
->file
, fput_needed
);
2017 SYSCALL_DEFINE3(sendmsg
, int, fd
, struct user_msghdr __user
*, msg
, unsigned int, flags
)
2019 if (flags
& MSG_CMSG_COMPAT
)
2021 return __sys_sendmsg(fd
, msg
, flags
);
2025 * Linux sendmmsg interface
2028 int __sys_sendmmsg(int fd
, struct mmsghdr __user
*mmsg
, unsigned int vlen
,
2031 int fput_needed
, err
, datagrams
;
2032 struct socket
*sock
;
2033 struct mmsghdr __user
*entry
;
2034 struct compat_mmsghdr __user
*compat_entry
;
2035 struct msghdr msg_sys
;
2036 struct used_address used_address
;
2038 if (vlen
> UIO_MAXIOV
)
2043 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2047 used_address
.name_len
= UINT_MAX
;
2049 compat_entry
= (struct compat_mmsghdr __user
*)mmsg
;
2052 while (datagrams
< vlen
) {
2053 if (MSG_CMSG_COMPAT
& flags
) {
2054 err
= ___sys_sendmsg(sock
, (struct user_msghdr __user
*)compat_entry
,
2055 &msg_sys
, flags
, &used_address
);
2058 err
= __put_user(err
, &compat_entry
->msg_len
);
2061 err
= ___sys_sendmsg(sock
,
2062 (struct user_msghdr __user
*)entry
,
2063 &msg_sys
, flags
, &used_address
);
2066 err
= put_user(err
, &entry
->msg_len
);
2075 fput_light(sock
->file
, fput_needed
);
2077 /* We only return an error if no datagrams were able to be sent */
2084 SYSCALL_DEFINE4(sendmmsg
, int, fd
, struct mmsghdr __user
*, mmsg
,
2085 unsigned int, vlen
, unsigned int, flags
)
2087 if (flags
& MSG_CMSG_COMPAT
)
2089 return __sys_sendmmsg(fd
, mmsg
, vlen
, flags
);
2092 static int ___sys_recvmsg(struct socket
*sock
, struct user_msghdr __user
*msg
,
2093 struct msghdr
*msg_sys
, unsigned int flags
, int nosec
)
2095 struct compat_msghdr __user
*msg_compat
=
2096 (struct compat_msghdr __user
*)msg
;
2097 struct iovec iovstack
[UIO_FASTIOV
];
2098 struct iovec
*iov
= iovstack
;
2099 unsigned long cmsg_ptr
;
2103 /* kernel mode address */
2104 struct sockaddr_storage addr
;
2106 /* user mode address pointers */
2107 struct sockaddr __user
*uaddr
;
2108 int __user
*uaddr_len
= COMPAT_NAMELEN(msg
);
2110 msg_sys
->msg_name
= &addr
;
2112 if (MSG_CMSG_COMPAT
& flags
)
2113 err
= get_compat_msghdr(msg_sys
, msg_compat
, &uaddr
, &iov
);
2115 err
= copy_msghdr_from_user(msg_sys
, msg
, &uaddr
, &iov
);
2120 cmsg_ptr
= (unsigned long)msg_sys
->msg_control
;
2121 msg_sys
->msg_flags
= flags
& (MSG_CMSG_CLOEXEC
|MSG_CMSG_COMPAT
);
2123 /* We assume all kernel code knows the size of sockaddr_storage */
2124 msg_sys
->msg_namelen
= 0;
2126 if (sock
->file
->f_flags
& O_NONBLOCK
)
2127 flags
|= MSG_DONTWAIT
;
2128 err
= (nosec
? sock_recvmsg_nosec
: sock_recvmsg
)(sock
, msg_sys
,
2134 if (uaddr
!= NULL
) {
2135 err
= move_addr_to_user(&addr
,
2136 msg_sys
->msg_namelen
, uaddr
,
2141 err
= __put_user((msg_sys
->msg_flags
& ~MSG_CMSG_COMPAT
),
2145 if (MSG_CMSG_COMPAT
& flags
)
2146 err
= __put_user((unsigned long)msg_sys
->msg_control
- cmsg_ptr
,
2147 &msg_compat
->msg_controllen
);
2149 err
= __put_user((unsigned long)msg_sys
->msg_control
- cmsg_ptr
,
2150 &msg
->msg_controllen
);
2156 if (iov
!= iovstack
)
2162 * BSD recvmsg interface
2165 long __sys_recvmsg(int fd
, struct user_msghdr __user
*msg
, unsigned flags
)
2167 int fput_needed
, err
;
2168 struct msghdr msg_sys
;
2169 struct socket
*sock
;
2171 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2175 err
= ___sys_recvmsg(sock
, msg
, &msg_sys
, flags
, 0);
2177 fput_light(sock
->file
, fput_needed
);
2182 SYSCALL_DEFINE3(recvmsg
, int, fd
, struct user_msghdr __user
*, msg
,
2183 unsigned int, flags
)
2185 if (flags
& MSG_CMSG_COMPAT
)
2187 return __sys_recvmsg(fd
, msg
, flags
);
2191 * Linux recvmmsg interface
2194 int __sys_recvmmsg(int fd
, struct mmsghdr __user
*mmsg
, unsigned int vlen
,
2195 unsigned int flags
, struct timespec
*timeout
)
2197 int fput_needed
, err
, datagrams
;
2198 struct socket
*sock
;
2199 struct mmsghdr __user
*entry
;
2200 struct compat_mmsghdr __user
*compat_entry
;
2201 struct msghdr msg_sys
;
2202 struct timespec end_time
;
2205 poll_select_set_timeout(&end_time
, timeout
->tv_sec
,
2211 sock
= sockfd_lookup_light(fd
, &err
, &fput_needed
);
2215 err
= sock_error(sock
->sk
);
2220 compat_entry
= (struct compat_mmsghdr __user
*)mmsg
;
2222 while (datagrams
< vlen
) {
2224 * No need to ask LSM for more than the first datagram.
2226 if (MSG_CMSG_COMPAT
& flags
) {
2227 err
= ___sys_recvmsg(sock
, (struct user_msghdr __user
*)compat_entry
,
2228 &msg_sys
, flags
& ~MSG_WAITFORONE
,
2232 err
= __put_user(err
, &compat_entry
->msg_len
);
2235 err
= ___sys_recvmsg(sock
,
2236 (struct user_msghdr __user
*)entry
,
2237 &msg_sys
, flags
& ~MSG_WAITFORONE
,
2241 err
= put_user(err
, &entry
->msg_len
);
2249 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2250 if (flags
& MSG_WAITFORONE
)
2251 flags
|= MSG_DONTWAIT
;
2254 ktime_get_ts(timeout
);
2255 *timeout
= timespec_sub(end_time
, *timeout
);
2256 if (timeout
->tv_sec
< 0) {
2257 timeout
->tv_sec
= timeout
->tv_nsec
= 0;
2261 /* Timeout, return less than vlen datagrams */
2262 if (timeout
->tv_nsec
== 0 && timeout
->tv_sec
== 0)
2266 /* Out of band data, return right away */
2267 if (msg_sys
.msg_flags
& MSG_OOB
)
2272 fput_light(sock
->file
, fput_needed
);
2277 if (datagrams
!= 0) {
2279 * We may return less entries than requested (vlen) if the
2280 * sock is non block and there aren't enough datagrams...
2282 if (err
!= -EAGAIN
) {
2284 * ... or if recvmsg returns an error after we
2285 * received some datagrams, where we record the
2286 * error to return on the next call or if the
2287 * app asks about it using getsockopt(SO_ERROR).
2289 sock
->sk
->sk_err
= -err
;
2298 SYSCALL_DEFINE5(recvmmsg
, int, fd
, struct mmsghdr __user
*, mmsg
,
2299 unsigned int, vlen
, unsigned int, flags
,
2300 struct timespec __user
*, timeout
)
2303 struct timespec timeout_sys
;
2305 if (flags
& MSG_CMSG_COMPAT
)
2309 return __sys_recvmmsg(fd
, mmsg
, vlen
, flags
, NULL
);
2311 if (copy_from_user(&timeout_sys
, timeout
, sizeof(timeout_sys
)))
2314 datagrams
= __sys_recvmmsg(fd
, mmsg
, vlen
, flags
, &timeout_sys
);
2316 if (datagrams
> 0 &&
2317 copy_to_user(timeout
, &timeout_sys
, sizeof(timeout_sys
)))
2318 datagrams
= -EFAULT
;
2323 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2324 /* Argument list sizes for sys_socketcall */
2325 #define AL(x) ((x) * sizeof(unsigned long))
2326 static const unsigned char nargs
[21] = {
2327 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2328 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2329 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2336 * System call vectors.
2338 * Argument checking cleaned up. Saved 20% in size.
2339 * This function doesn't need to set the kernel lock because
2340 * it is set by the callees.
2343 SYSCALL_DEFINE2(socketcall
, int, call
, unsigned long __user
*, args
)
2345 unsigned long a
[AUDITSC_ARGS
];
2346 unsigned long a0
, a1
;
2350 if (call
< 1 || call
> SYS_SENDMMSG
)
2354 if (len
> sizeof(a
))
2357 /* copy_from_user should be SMP safe. */
2358 if (copy_from_user(a
, args
, len
))
2361 err
= audit_socketcall(nargs
[call
] / sizeof(unsigned long), a
);
2370 err
= sys_socket(a0
, a1
, a
[2]);
2373 err
= sys_bind(a0
, (struct sockaddr __user
*)a1
, a
[2]);
2376 err
= sys_connect(a0
, (struct sockaddr __user
*)a1
, a
[2]);
2379 err
= sys_listen(a0
, a1
);
2382 err
= sys_accept4(a0
, (struct sockaddr __user
*)a1
,
2383 (int __user
*)a
[2], 0);
2385 case SYS_GETSOCKNAME
:
2387 sys_getsockname(a0
, (struct sockaddr __user
*)a1
,
2388 (int __user
*)a
[2]);
2390 case SYS_GETPEERNAME
:
2392 sys_getpeername(a0
, (struct sockaddr __user
*)a1
,
2393 (int __user
*)a
[2]);
2395 case SYS_SOCKETPAIR
:
2396 err
= sys_socketpair(a0
, a1
, a
[2], (int __user
*)a
[3]);
2399 err
= sys_send(a0
, (void __user
*)a1
, a
[2], a
[3]);
2402 err
= sys_sendto(a0
, (void __user
*)a1
, a
[2], a
[3],
2403 (struct sockaddr __user
*)a
[4], a
[5]);
2406 err
= sys_recv(a0
, (void __user
*)a1
, a
[2], a
[3]);
2409 err
= sys_recvfrom(a0
, (void __user
*)a1
, a
[2], a
[3],
2410 (struct sockaddr __user
*)a
[4],
2411 (int __user
*)a
[5]);
2414 err
= sys_shutdown(a0
, a1
);
2416 case SYS_SETSOCKOPT
:
2417 err
= sys_setsockopt(a0
, a1
, a
[2], (char __user
*)a
[3], a
[4]);
2419 case SYS_GETSOCKOPT
:
2421 sys_getsockopt(a0
, a1
, a
[2], (char __user
*)a
[3],
2422 (int __user
*)a
[4]);
2425 err
= sys_sendmsg(a0
, (struct user_msghdr __user
*)a1
, a
[2]);
2428 err
= sys_sendmmsg(a0
, (struct mmsghdr __user
*)a1
, a
[2], a
[3]);
2431 err
= sys_recvmsg(a0
, (struct user_msghdr __user
*)a1
, a
[2]);
2434 err
= sys_recvmmsg(a0
, (struct mmsghdr __user
*)a1
, a
[2], a
[3],
2435 (struct timespec __user
*)a
[4]);
2438 err
= sys_accept4(a0
, (struct sockaddr __user
*)a1
,
2439 (int __user
*)a
[2], a
[3]);
2448 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
2451 * sock_register - add a socket protocol handler
2452 * @ops: description of protocol
2454 * This function is called by a protocol handler that wants to
2455 * advertise its address family, and have it linked into the
2456 * socket interface. The value ops->family corresponds to the
2457 * socket system call protocol family.
2459 int sock_register(const struct net_proto_family
*ops
)
2463 if (ops
->family
>= NPROTO
) {
2464 pr_crit("protocol %d >= NPROTO(%d)\n", ops
->family
, NPROTO
);
2468 spin_lock(&net_family_lock
);
2469 if (rcu_dereference_protected(net_families
[ops
->family
],
2470 lockdep_is_held(&net_family_lock
)))
2473 rcu_assign_pointer(net_families
[ops
->family
], ops
);
2476 spin_unlock(&net_family_lock
);
2478 pr_info("NET: Registered protocol family %d\n", ops
->family
);
2481 EXPORT_SYMBOL(sock_register
);
2484 * sock_unregister - remove a protocol handler
2485 * @family: protocol family to remove
2487 * This function is called by a protocol handler that wants to
2488 * remove its address family, and have it unlinked from the
2489 * new socket creation.
2491 * If protocol handler is a module, then it can use module reference
2492 * counts to protect against new references. If protocol handler is not
2493 * a module then it needs to provide its own protection in
2494 * the ops->create routine.
2496 void sock_unregister(int family
)
2498 BUG_ON(family
< 0 || family
>= NPROTO
);
2500 spin_lock(&net_family_lock
);
2501 RCU_INIT_POINTER(net_families
[family
], NULL
);
2502 spin_unlock(&net_family_lock
);
2506 pr_info("NET: Unregistered protocol family %d\n", family
);
2508 EXPORT_SYMBOL(sock_unregister
);
2510 static int __init
sock_init(void)
2514 * Initialize the network sysctl infrastructure.
2516 err
= net_sysctl_init();
2521 * Initialize skbuff SLAB cache
2526 * Initialize the protocols module.
2531 err
= register_filesystem(&sock_fs_type
);
2534 sock_mnt
= kern_mount(&sock_fs_type
);
2535 if (IS_ERR(sock_mnt
)) {
2536 err
= PTR_ERR(sock_mnt
);
2540 /* The real protocol initialization is performed in later initcalls.
2543 #ifdef CONFIG_NETFILTER
2544 err
= netfilter_init();
2549 ptp_classifier_init();
2555 unregister_filesystem(&sock_fs_type
);
2560 core_initcall(sock_init
); /* early initcall */
2562 #ifdef CONFIG_PROC_FS
2563 void socket_seq_show(struct seq_file
*seq
)
2568 for_each_possible_cpu(cpu
)
2569 counter
+= per_cpu(sockets_in_use
, cpu
);
2571 /* It can be negative, by the way. 8) */
2575 seq_printf(seq
, "sockets: used %d\n", counter
);
2577 #endif /* CONFIG_PROC_FS */
2579 #ifdef CONFIG_COMPAT
2580 static int do_siocgstamp(struct net
*net
, struct socket
*sock
,
2581 unsigned int cmd
, void __user
*up
)
2583 mm_segment_t old_fs
= get_fs();
2588 err
= sock_do_ioctl(net
, sock
, cmd
, (unsigned long)&ktv
);
2591 err
= compat_put_timeval(&ktv
, up
);
2596 static int do_siocgstampns(struct net
*net
, struct socket
*sock
,
2597 unsigned int cmd
, void __user
*up
)
2599 mm_segment_t old_fs
= get_fs();
2600 struct timespec kts
;
2604 err
= sock_do_ioctl(net
, sock
, cmd
, (unsigned long)&kts
);
2607 err
= compat_put_timespec(&kts
, up
);
2612 static int dev_ifname32(struct net
*net
, struct compat_ifreq __user
*uifr32
)
2614 struct ifreq __user
*uifr
;
2617 uifr
= compat_alloc_user_space(sizeof(struct ifreq
));
2618 if (copy_in_user(uifr
, uifr32
, sizeof(struct compat_ifreq
)))
2621 err
= dev_ioctl(net
, SIOCGIFNAME
, uifr
);
2625 if (copy_in_user(uifr32
, uifr
, sizeof(struct compat_ifreq
)))
2631 static int dev_ifconf(struct net
*net
, struct compat_ifconf __user
*uifc32
)
2633 struct compat_ifconf ifc32
;
2635 struct ifconf __user
*uifc
;
2636 struct compat_ifreq __user
*ifr32
;
2637 struct ifreq __user
*ifr
;
2641 if (copy_from_user(&ifc32
, uifc32
, sizeof(struct compat_ifconf
)))
2644 memset(&ifc
, 0, sizeof(ifc
));
2645 if (ifc32
.ifcbuf
== 0) {
2649 uifc
= compat_alloc_user_space(sizeof(struct ifconf
));
2651 size_t len
= ((ifc32
.ifc_len
/ sizeof(struct compat_ifreq
)) + 1) *
2652 sizeof(struct ifreq
);
2653 uifc
= compat_alloc_user_space(sizeof(struct ifconf
) + len
);
2655 ifr
= ifc
.ifc_req
= (void __user
*)(uifc
+ 1);
2656 ifr32
= compat_ptr(ifc32
.ifcbuf
);
2657 for (i
= 0; i
< ifc32
.ifc_len
; i
+= sizeof(struct compat_ifreq
)) {
2658 if (copy_in_user(ifr
, ifr32
, sizeof(struct compat_ifreq
)))
2664 if (copy_to_user(uifc
, &ifc
, sizeof(struct ifconf
)))
2667 err
= dev_ioctl(net
, SIOCGIFCONF
, uifc
);
2671 if (copy_from_user(&ifc
, uifc
, sizeof(struct ifconf
)))
2675 ifr32
= compat_ptr(ifc32
.ifcbuf
);
2677 i
+ sizeof(struct compat_ifreq
) <= ifc32
.ifc_len
&& j
< ifc
.ifc_len
;
2678 i
+= sizeof(struct compat_ifreq
), j
+= sizeof(struct ifreq
)) {
2679 if (copy_in_user(ifr32
, ifr
, sizeof(struct compat_ifreq
)))
2685 if (ifc32
.ifcbuf
== 0) {
2686 /* Translate from 64-bit structure multiple to
2690 i
= ((i
/ sizeof(struct ifreq
)) * sizeof(struct compat_ifreq
));
2695 if (copy_to_user(uifc32
, &ifc32
, sizeof(struct compat_ifconf
)))
2701 static int ethtool_ioctl(struct net
*net
, struct compat_ifreq __user
*ifr32
)
2703 struct compat_ethtool_rxnfc __user
*compat_rxnfc
;
2704 bool convert_in
= false, convert_out
= false;
2705 size_t buf_size
= ALIGN(sizeof(struct ifreq
), 8);
2706 struct ethtool_rxnfc __user
*rxnfc
;
2707 struct ifreq __user
*ifr
;
2708 u32 rule_cnt
= 0, actual_rule_cnt
;
2713 if (get_user(data
, &ifr32
->ifr_ifru
.ifru_data
))
2716 compat_rxnfc
= compat_ptr(data
);
2718 if (get_user(ethcmd
, &compat_rxnfc
->cmd
))
2721 /* Most ethtool structures are defined without padding.
2722 * Unfortunately struct ethtool_rxnfc is an exception.
2727 case ETHTOOL_GRXCLSRLALL
:
2728 /* Buffer size is variable */
2729 if (get_user(rule_cnt
, &compat_rxnfc
->rule_cnt
))
2731 if (rule_cnt
> KMALLOC_MAX_SIZE
/ sizeof(u32
))
2733 buf_size
+= rule_cnt
* sizeof(u32
);
2735 case ETHTOOL_GRXRINGS
:
2736 case ETHTOOL_GRXCLSRLCNT
:
2737 case ETHTOOL_GRXCLSRULE
:
2738 case ETHTOOL_SRXCLSRLINS
:
2741 case ETHTOOL_SRXCLSRLDEL
:
2742 buf_size
+= sizeof(struct ethtool_rxnfc
);
2747 ifr
= compat_alloc_user_space(buf_size
);
2748 rxnfc
= (void __user
*)ifr
+ ALIGN(sizeof(struct ifreq
), 8);
2750 if (copy_in_user(&ifr
->ifr_name
, &ifr32
->ifr_name
, IFNAMSIZ
))
2753 if (put_user(convert_in
? rxnfc
: compat_ptr(data
),
2754 &ifr
->ifr_ifru
.ifru_data
))
2758 /* We expect there to be holes between fs.m_ext and
2759 * fs.ring_cookie and at the end of fs, but nowhere else.
2761 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc
, fs
.m_ext
) +
2762 sizeof(compat_rxnfc
->fs
.m_ext
) !=
2763 offsetof(struct ethtool_rxnfc
, fs
.m_ext
) +
2764 sizeof(rxnfc
->fs
.m_ext
));
2766 offsetof(struct compat_ethtool_rxnfc
, fs
.location
) -
2767 offsetof(struct compat_ethtool_rxnfc
, fs
.ring_cookie
) !=
2768 offsetof(struct ethtool_rxnfc
, fs
.location
) -
2769 offsetof(struct ethtool_rxnfc
, fs
.ring_cookie
));
2771 if (copy_in_user(rxnfc
, compat_rxnfc
,
2772 (void __user
*)(&rxnfc
->fs
.m_ext
+ 1) -
2773 (void __user
*)rxnfc
) ||
2774 copy_in_user(&rxnfc
->fs
.ring_cookie
,
2775 &compat_rxnfc
->fs
.ring_cookie
,
2776 (void __user
*)(&rxnfc
->fs
.location
+ 1) -
2777 (void __user
*)&rxnfc
->fs
.ring_cookie
) ||
2778 copy_in_user(&rxnfc
->rule_cnt
, &compat_rxnfc
->rule_cnt
,
2779 sizeof(rxnfc
->rule_cnt
)))
2783 ret
= dev_ioctl(net
, SIOCETHTOOL
, ifr
);
2788 if (copy_in_user(compat_rxnfc
, rxnfc
,
2789 (const void __user
*)(&rxnfc
->fs
.m_ext
+ 1) -
2790 (const void __user
*)rxnfc
) ||
2791 copy_in_user(&compat_rxnfc
->fs
.ring_cookie
,
2792 &rxnfc
->fs
.ring_cookie
,
2793 (const void __user
*)(&rxnfc
->fs
.location
+ 1) -
2794 (const void __user
*)&rxnfc
->fs
.ring_cookie
) ||
2795 copy_in_user(&compat_rxnfc
->rule_cnt
, &rxnfc
->rule_cnt
,
2796 sizeof(rxnfc
->rule_cnt
)))
2799 if (ethcmd
== ETHTOOL_GRXCLSRLALL
) {
2800 /* As an optimisation, we only copy the actual
2801 * number of rules that the underlying
2802 * function returned. Since Mallory might
2803 * change the rule count in user memory, we
2804 * check that it is less than the rule count
2805 * originally given (as the user buffer size),
2806 * which has been range-checked.
2808 if (get_user(actual_rule_cnt
, &rxnfc
->rule_cnt
))
2810 if (actual_rule_cnt
< rule_cnt
)
2811 rule_cnt
= actual_rule_cnt
;
2812 if (copy_in_user(&compat_rxnfc
->rule_locs
[0],
2813 &rxnfc
->rule_locs
[0],
2814 rule_cnt
* sizeof(u32
)))
2822 static int compat_siocwandev(struct net
*net
, struct compat_ifreq __user
*uifr32
)
2825 compat_uptr_t uptr32
;
2826 struct ifreq __user
*uifr
;
2828 uifr
= compat_alloc_user_space(sizeof(*uifr
));
2829 if (copy_in_user(uifr
, uifr32
, sizeof(struct compat_ifreq
)))
2832 if (get_user(uptr32
, &uifr32
->ifr_settings
.ifs_ifsu
))
2835 uptr
= compat_ptr(uptr32
);
2837 if (put_user(uptr
, &uifr
->ifr_settings
.ifs_ifsu
.raw_hdlc
))
2840 return dev_ioctl(net
, SIOCWANDEV
, uifr
);
2843 static int bond_ioctl(struct net
*net
, unsigned int cmd
,
2844 struct compat_ifreq __user
*ifr32
)
2847 mm_segment_t old_fs
;
2851 case SIOCBONDENSLAVE
:
2852 case SIOCBONDRELEASE
:
2853 case SIOCBONDSETHWADDR
:
2854 case SIOCBONDCHANGEACTIVE
:
2855 if (copy_from_user(&kifr
, ifr32
, sizeof(struct compat_ifreq
)))
2860 err
= dev_ioctl(net
, cmd
,
2861 (struct ifreq __user __force
*) &kifr
);
2866 return -ENOIOCTLCMD
;
2870 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2871 static int compat_ifr_data_ioctl(struct net
*net
, unsigned int cmd
,
2872 struct compat_ifreq __user
*u_ifreq32
)
2874 struct ifreq __user
*u_ifreq64
;
2875 char tmp_buf
[IFNAMSIZ
];
2876 void __user
*data64
;
2879 if (copy_from_user(&tmp_buf
[0], &(u_ifreq32
->ifr_ifrn
.ifrn_name
[0]),
2882 if (get_user(data32
, &u_ifreq32
->ifr_ifru
.ifru_data
))
2884 data64
= compat_ptr(data32
);
2886 u_ifreq64
= compat_alloc_user_space(sizeof(*u_ifreq64
));
2888 if (copy_to_user(&u_ifreq64
->ifr_ifrn
.ifrn_name
[0], &tmp_buf
[0],
2891 if (put_user(data64
, &u_ifreq64
->ifr_ifru
.ifru_data
))
2894 return dev_ioctl(net
, cmd
, u_ifreq64
);
2897 static int dev_ifsioc(struct net
*net
, struct socket
*sock
,
2898 unsigned int cmd
, struct compat_ifreq __user
*uifr32
)
2900 struct ifreq __user
*uifr
;
2903 uifr
= compat_alloc_user_space(sizeof(*uifr
));
2904 if (copy_in_user(uifr
, uifr32
, sizeof(*uifr32
)))
2907 err
= sock_do_ioctl(net
, sock
, cmd
, (unsigned long)uifr
);
2918 case SIOCGIFBRDADDR
:
2919 case SIOCGIFDSTADDR
:
2920 case SIOCGIFNETMASK
:
2925 if (copy_in_user(uifr32
, uifr
, sizeof(*uifr32
)))
2933 static int compat_sioc_ifmap(struct net
*net
, unsigned int cmd
,
2934 struct compat_ifreq __user
*uifr32
)
2937 struct compat_ifmap __user
*uifmap32
;
2938 mm_segment_t old_fs
;
2941 uifmap32
= &uifr32
->ifr_ifru
.ifru_map
;
2942 err
= copy_from_user(&ifr
, uifr32
, sizeof(ifr
.ifr_name
));
2943 err
|= get_user(ifr
.ifr_map
.mem_start
, &uifmap32
->mem_start
);
2944 err
|= get_user(ifr
.ifr_map
.mem_end
, &uifmap32
->mem_end
);
2945 err
|= get_user(ifr
.ifr_map
.base_addr
, &uifmap32
->base_addr
);
2946 err
|= get_user(ifr
.ifr_map
.irq
, &uifmap32
->irq
);
2947 err
|= get_user(ifr
.ifr_map
.dma
, &uifmap32
->dma
);
2948 err
|= get_user(ifr
.ifr_map
.port
, &uifmap32
->port
);
2954 err
= dev_ioctl(net
, cmd
, (void __user __force
*)&ifr
);
2957 if (cmd
== SIOCGIFMAP
&& !err
) {
2958 err
= copy_to_user(uifr32
, &ifr
, sizeof(ifr
.ifr_name
));
2959 err
|= put_user(ifr
.ifr_map
.mem_start
, &uifmap32
->mem_start
);
2960 err
|= put_user(ifr
.ifr_map
.mem_end
, &uifmap32
->mem_end
);
2961 err
|= put_user(ifr
.ifr_map
.base_addr
, &uifmap32
->base_addr
);
2962 err
|= put_user(ifr
.ifr_map
.irq
, &uifmap32
->irq
);
2963 err
|= put_user(ifr
.ifr_map
.dma
, &uifmap32
->dma
);
2964 err
|= put_user(ifr
.ifr_map
.port
, &uifmap32
->port
);
2973 struct sockaddr rt_dst
; /* target address */
2974 struct sockaddr rt_gateway
; /* gateway addr (RTF_GATEWAY) */
2975 struct sockaddr rt_genmask
; /* target network mask (IP) */
2976 unsigned short rt_flags
;
2979 unsigned char rt_tos
;
2980 unsigned char rt_class
;
2982 short rt_metric
; /* +1 for binary compatibility! */
2983 /* char * */ u32 rt_dev
; /* forcing the device at add */
2984 u32 rt_mtu
; /* per route MTU/Window */
2985 u32 rt_window
; /* Window clamping */
2986 unsigned short rt_irtt
; /* Initial RTT */
2989 struct in6_rtmsg32
{
2990 struct in6_addr rtmsg_dst
;
2991 struct in6_addr rtmsg_src
;
2992 struct in6_addr rtmsg_gateway
;
3002 static int routing_ioctl(struct net
*net
, struct socket
*sock
,
3003 unsigned int cmd
, void __user
*argp
)
3007 struct in6_rtmsg r6
;
3011 mm_segment_t old_fs
= get_fs();
3013 if (sock
&& sock
->sk
&& sock
->sk
->sk_family
== AF_INET6
) { /* ipv6 */
3014 struct in6_rtmsg32 __user
*ur6
= argp
;
3015 ret
= copy_from_user(&r6
.rtmsg_dst
, &(ur6
->rtmsg_dst
),
3016 3 * sizeof(struct in6_addr
));
3017 ret
|= get_user(r6
.rtmsg_type
, &(ur6
->rtmsg_type
));
3018 ret
|= get_user(r6
.rtmsg_dst_len
, &(ur6
->rtmsg_dst_len
));
3019 ret
|= get_user(r6
.rtmsg_src_len
, &(ur6
->rtmsg_src_len
));
3020 ret
|= get_user(r6
.rtmsg_metric
, &(ur6
->rtmsg_metric
));
3021 ret
|= get_user(r6
.rtmsg_info
, &(ur6
->rtmsg_info
));
3022 ret
|= get_user(r6
.rtmsg_flags
, &(ur6
->rtmsg_flags
));
3023 ret
|= get_user(r6
.rtmsg_ifindex
, &(ur6
->rtmsg_ifindex
));
3027 struct rtentry32 __user
*ur4
= argp
;
3028 ret
= copy_from_user(&r4
.rt_dst
, &(ur4
->rt_dst
),
3029 3 * sizeof(struct sockaddr
));
3030 ret
|= get_user(r4
.rt_flags
, &(ur4
->rt_flags
));
3031 ret
|= get_user(r4
.rt_metric
, &(ur4
->rt_metric
));
3032 ret
|= get_user(r4
.rt_mtu
, &(ur4
->rt_mtu
));
3033 ret
|= get_user(r4
.rt_window
, &(ur4
->rt_window
));
3034 ret
|= get_user(r4
.rt_irtt
, &(ur4
->rt_irtt
));
3035 ret
|= get_user(rtdev
, &(ur4
->rt_dev
));
3037 ret
|= copy_from_user(devname
, compat_ptr(rtdev
), 15);
3038 r4
.rt_dev
= (char __user __force
*)devname
;
3052 ret
= sock_do_ioctl(net
, sock
, cmd
, (unsigned long) r
);
3059 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3060 * for some operations; this forces use of the newer bridge-utils that
3061 * use compatible ioctls
3063 static int old_bridge_ioctl(compat_ulong_t __user
*argp
)
3067 if (get_user(tmp
, argp
))
3069 if (tmp
== BRCTL_GET_VERSION
)
3070 return BRCTL_VERSION
+ 1;
3074 static int compat_sock_ioctl_trans(struct file
*file
, struct socket
*sock
,
3075 unsigned int cmd
, unsigned long arg
)
3077 void __user
*argp
= compat_ptr(arg
);
3078 struct sock
*sk
= sock
->sk
;
3079 struct net
*net
= sock_net(sk
);
3081 if (cmd
>= SIOCDEVPRIVATE
&& cmd
<= (SIOCDEVPRIVATE
+ 15))
3082 return compat_ifr_data_ioctl(net
, cmd
, argp
);
3087 return old_bridge_ioctl(argp
);
3089 return dev_ifname32(net
, argp
);
3091 return dev_ifconf(net
, argp
);
3093 return ethtool_ioctl(net
, argp
);
3095 return compat_siocwandev(net
, argp
);
3098 return compat_sioc_ifmap(net
, cmd
, argp
);
3099 case SIOCBONDENSLAVE
:
3100 case SIOCBONDRELEASE
:
3101 case SIOCBONDSETHWADDR
:
3102 case SIOCBONDCHANGEACTIVE
:
3103 return bond_ioctl(net
, cmd
, argp
);
3106 return routing_ioctl(net
, sock
, cmd
, argp
);
3108 return do_siocgstamp(net
, sock
, cmd
, argp
);
3110 return do_siocgstampns(net
, sock
, cmd
, argp
);
3111 case SIOCBONDSLAVEINFOQUERY
:
3112 case SIOCBONDINFOQUERY
:
3115 return compat_ifr_data_ioctl(net
, cmd
, argp
);
3127 return sock_ioctl(file
, cmd
, arg
);
3144 case SIOCSIFHWBROADCAST
:
3146 case SIOCGIFBRDADDR
:
3147 case SIOCSIFBRDADDR
:
3148 case SIOCGIFDSTADDR
:
3149 case SIOCSIFDSTADDR
:
3150 case SIOCGIFNETMASK
:
3151 case SIOCSIFNETMASK
:
3162 return dev_ifsioc(net
, sock
, cmd
, argp
);
3168 return sock_do_ioctl(net
, sock
, cmd
, arg
);
3171 return -ENOIOCTLCMD
;
3174 static long compat_sock_ioctl(struct file
*file
, unsigned int cmd
,
3177 struct socket
*sock
= file
->private_data
;
3178 int ret
= -ENOIOCTLCMD
;
3185 if (sock
->ops
->compat_ioctl
)
3186 ret
= sock
->ops
->compat_ioctl(sock
, cmd
, arg
);
3188 if (ret
== -ENOIOCTLCMD
&&
3189 (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
))
3190 ret
= compat_wext_handle_ioctl(net
, cmd
, arg
);
3192 if (ret
== -ENOIOCTLCMD
)
3193 ret
= compat_sock_ioctl_trans(file
, sock
, cmd
, arg
);
3199 int kernel_bind(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
)
3201 return sock
->ops
->bind(sock
, addr
, addrlen
);
3203 EXPORT_SYMBOL(kernel_bind
);
3205 int kernel_listen(struct socket
*sock
, int backlog
)
3207 return sock
->ops
->listen(sock
, backlog
);
3209 EXPORT_SYMBOL(kernel_listen
);
3211 int kernel_accept(struct socket
*sock
, struct socket
**newsock
, int flags
)
3213 struct sock
*sk
= sock
->sk
;
3216 err
= sock_create_lite(sk
->sk_family
, sk
->sk_type
, sk
->sk_protocol
,
3221 err
= sock
->ops
->accept(sock
, *newsock
, flags
);
3223 sock_release(*newsock
);
3228 (*newsock
)->ops
= sock
->ops
;
3229 __module_get((*newsock
)->ops
->owner
);
3234 EXPORT_SYMBOL(kernel_accept
);
3236 int kernel_connect(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
,
3239 return sock
->ops
->connect(sock
, addr
, addrlen
, flags
);
3241 EXPORT_SYMBOL(kernel_connect
);
3243 int kernel_getsockname(struct socket
*sock
, struct sockaddr
*addr
,
3246 return sock
->ops
->getname(sock
, addr
, addrlen
, 0);
3248 EXPORT_SYMBOL(kernel_getsockname
);
3250 int kernel_getpeername(struct socket
*sock
, struct sockaddr
*addr
,
3253 return sock
->ops
->getname(sock
, addr
, addrlen
, 1);
3255 EXPORT_SYMBOL(kernel_getpeername
);
3257 int kernel_getsockopt(struct socket
*sock
, int level
, int optname
,
3258 char *optval
, int *optlen
)
3260 mm_segment_t oldfs
= get_fs();
3261 char __user
*uoptval
;
3262 int __user
*uoptlen
;
3265 uoptval
= (char __user __force
*) optval
;
3266 uoptlen
= (int __user __force
*) optlen
;
3269 if (level
== SOL_SOCKET
)
3270 err
= sock_getsockopt(sock
, level
, optname
, uoptval
, uoptlen
);
3272 err
= sock
->ops
->getsockopt(sock
, level
, optname
, uoptval
,
3277 EXPORT_SYMBOL(kernel_getsockopt
);
3279 int kernel_setsockopt(struct socket
*sock
, int level
, int optname
,
3280 char *optval
, unsigned int optlen
)
3282 mm_segment_t oldfs
= get_fs();
3283 char __user
*uoptval
;
3286 uoptval
= (char __user __force
*) optval
;
3289 if (level
== SOL_SOCKET
)
3290 err
= sock_setsockopt(sock
, level
, optname
, uoptval
, optlen
);
3292 err
= sock
->ops
->setsockopt(sock
, level
, optname
, uoptval
,
3297 EXPORT_SYMBOL(kernel_setsockopt
);
3299 int kernel_sendpage(struct socket
*sock
, struct page
*page
, int offset
,
3300 size_t size
, int flags
)
3302 if (sock
->ops
->sendpage
)
3303 return sock
->ops
->sendpage(sock
, page
, offset
, size
, flags
);
3305 return sock_no_sendpage(sock
, page
, offset
, size
, flags
);
3307 EXPORT_SYMBOL(kernel_sendpage
);
3309 int kernel_sock_ioctl(struct socket
*sock
, int cmd
, unsigned long arg
)
3311 mm_segment_t oldfs
= get_fs();
3315 err
= sock
->ops
->ioctl(sock
, cmd
, arg
);
3320 EXPORT_SYMBOL(kernel_sock_ioctl
);
3322 int kernel_sock_shutdown(struct socket
*sock
, enum sock_shutdown_cmd how
)
3324 return sock
->ops
->shutdown(sock
, how
);
3326 EXPORT_SYMBOL(kernel_sock_shutdown
);