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 kiocb *iocb, struct socket *sock,
614 struct msghdr *msg, size_t size)
616 return sock->ops->sendmsg(iocb, sock, msg, size);
619 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
620 struct msghdr *msg, size_t size)
622 int err = security_socket_sendmsg(sock, msg, size);
624 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
627 static int do_sock_sendmsg(struct socket *sock, struct msghdr *msg,
628 size_t size, bool nosec)
633 init_sync_kiocb(&iocb, NULL);
634 ret = nosec ? __sock_sendmsg_nosec(&iocb, sock, msg, size) :
635 __sock_sendmsg(&iocb, sock, msg, size);
636 if (-EIOCBQUEUED == ret)
637 ret = wait_on_sync_kiocb(&iocb);
641 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
643 return do_sock_sendmsg(sock, msg, size, false);
645 EXPORT_SYMBOL(sock_sendmsg);
647 static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
649 return do_sock_sendmsg(sock, msg, size, true);
652 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
653 struct kvec *vec, size_t num, size_t size)
655 mm_segment_t oldfs = get_fs();
660 * the following is safe, since for compiler definitions of kvec and
661 * iovec are identical, yielding the same in-core layout and alignment
663 iov_iter_init(&msg->msg_iter, WRITE, (struct iovec *)vec, num, size);
664 result = sock_sendmsg(sock, msg, size);
668 EXPORT_SYMBOL(kernel_sendmsg);
671 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
673 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
676 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
677 struct scm_timestamping tss;
679 struct skb_shared_hwtstamps *shhwtstamps =
682 /* Race occurred between timestamp enabling and packet
683 receiving. Fill in the current time for now. */
684 if (need_software_tstamp && skb->tstamp.tv64 == 0)
685 __net_timestamp(skb);
687 if (need_software_tstamp) {
688 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
690 skb_get_timestamp(skb, &tv);
691 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
695 skb_get_timestampns(skb, &ts);
696 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
701 memset(&tss, 0, sizeof(tss));
702 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
703 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
706 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
707 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
710 put_cmsg(msg, SOL_SOCKET,
711 SCM_TIMESTAMPING, sizeof(tss), &tss);
713 EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
715 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
720 if (!sock_flag(sk, SOCK_WIFI_STATUS))
722 if (!skb->wifi_acked_valid)
725 ack = skb->wifi_acked;
727 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
729 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
731 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
734 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
735 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
736 sizeof(__u32), &skb->dropcount);
739 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
742 sock_recv_timestamp(msg, sk, skb);
743 sock_recv_drops(msg, sk, skb);
745 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
747 static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
748 struct msghdr *msg, size_t size, int flags)
750 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
753 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
754 struct msghdr *msg, size_t size, int flags)
756 int err = security_socket_recvmsg(sock, msg, size, flags);
758 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
761 int sock_recvmsg(struct socket *sock, struct msghdr *msg,
762 size_t size, int flags)
767 init_sync_kiocb(&iocb, NULL);
768 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
769 if (-EIOCBQUEUED == ret)
770 ret = wait_on_sync_kiocb(&iocb);
773 EXPORT_SYMBOL(sock_recvmsg);
775 static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
776 size_t size, int flags)
781 init_sync_kiocb(&iocb, NULL);
782 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
783 if (-EIOCBQUEUED == ret)
784 ret = wait_on_sync_kiocb(&iocb);
789 * kernel_recvmsg - Receive a message from a socket (kernel space)
790 * @sock: The socket to receive the message from
791 * @msg: Received message
792 * @vec: Input s/g array for message data
793 * @num: Size of input s/g array
794 * @size: Number of bytes to read
795 * @flags: Message flags (MSG_DONTWAIT, etc...)
797 * On return the msg structure contains the scatter/gather array passed in the
798 * vec argument. The array is modified so that it consists of the unfilled
799 * portion of the original array.
801 * The returned value is the total number of bytes received, or an error.
803 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
804 struct kvec *vec, size_t num, size_t size, int flags)
806 mm_segment_t oldfs = get_fs();
811 * the following is safe, since for compiler definitions of kvec and
812 * iovec are identical, yielding the same in-core layout and alignment
814 iov_iter_init(&msg->msg_iter, READ, (struct iovec *)vec, num, size);
815 result = sock_recvmsg(sock, msg, size, flags);
819 EXPORT_SYMBOL(kernel_recvmsg);
821 static ssize_t sock_sendpage(struct file *file, struct page *page,
822 int offset, size_t size, loff_t *ppos, int more)
827 sock = file->private_data;
829 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
830 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
833 return kernel_sendpage(sock, page, offset, size, flags);
836 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
837 struct pipe_inode_info *pipe, size_t len,
840 struct socket *sock = file->private_data;
842 if (unlikely(!sock->ops->splice_read))
845 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
848 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
850 struct file *file = iocb->ki_filp;
851 struct socket *sock = file->private_data;
852 struct msghdr msg = {.msg_iter = *to};
855 if (file->f_flags & O_NONBLOCK)
856 msg.msg_flags = MSG_DONTWAIT;
858 if (iocb->ki_pos != 0)
861 if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
864 res = __sock_recvmsg(iocb, sock, &msg,
865 iocb->ki_nbytes, msg.msg_flags);
870 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
872 struct file *file = iocb->ki_filp;
873 struct socket *sock = file->private_data;
874 struct msghdr msg = {.msg_iter = *from};
877 if (iocb->ki_pos != 0)
880 if (file->f_flags & O_NONBLOCK)
881 msg.msg_flags = MSG_DONTWAIT;
883 if (sock->type == SOCK_SEQPACKET)
884 msg.msg_flags |= MSG_EOR;
886 res = __sock_sendmsg(iocb, sock, &msg, iocb->ki_nbytes);
887 *from = msg.msg_iter;
892 * Atomic setting of ioctl hooks to avoid race
893 * with module unload.
896 static DEFINE_MUTEX(br_ioctl_mutex);
897 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
899 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
901 mutex_lock(&br_ioctl_mutex);
902 br_ioctl_hook = hook;
903 mutex_unlock(&br_ioctl_mutex);
905 EXPORT_SYMBOL(brioctl_set);
907 static DEFINE_MUTEX(vlan_ioctl_mutex);
908 static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
910 void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
912 mutex_lock(&vlan_ioctl_mutex);
913 vlan_ioctl_hook = hook;
914 mutex_unlock(&vlan_ioctl_mutex);
916 EXPORT_SYMBOL(vlan_ioctl_set);
918 static DEFINE_MUTEX(dlci_ioctl_mutex);
919 static int (*dlci_ioctl_hook) (unsigned int, void __user *);
921 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
923 mutex_lock(&dlci_ioctl_mutex);
924 dlci_ioctl_hook = hook;
925 mutex_unlock(&dlci_ioctl_mutex);
927 EXPORT_SYMBOL(dlci_ioctl_set);
929 static long sock_do_ioctl(struct net *net, struct socket *sock,
930 unsigned int cmd, unsigned long arg)
933 void __user *argp = (void __user *)arg;
935 err = sock->ops->ioctl(sock, cmd, arg);
938 * If this ioctl is unknown try to hand it down
941 if (err == -ENOIOCTLCMD)
942 err = dev_ioctl(net, cmd, argp);
948 * With an ioctl, arg may well be a user mode pointer, but we don't know
949 * what to do with it - that's up to the protocol still.
952 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
956 void __user *argp = (void __user *)arg;
960 sock = file->private_data;
963 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
964 err = dev_ioctl(net, cmd, argp);
966 #ifdef CONFIG_WEXT_CORE
967 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
968 err = dev_ioctl(net, cmd, argp);
975 if (get_user(pid, (int __user *)argp))
977 f_setown(sock->file, pid, 1);
982 err = put_user(f_getown(sock->file),
991 request_module("bridge");
993 mutex_lock(&br_ioctl_mutex);
995 err = br_ioctl_hook(net, cmd, argp);
996 mutex_unlock(&br_ioctl_mutex);
1001 if (!vlan_ioctl_hook)
1002 request_module("8021q");
1004 mutex_lock(&vlan_ioctl_mutex);
1005 if (vlan_ioctl_hook)
1006 err = vlan_ioctl_hook(net, argp);
1007 mutex_unlock(&vlan_ioctl_mutex);
1012 if (!dlci_ioctl_hook)
1013 request_module("dlci");
1015 mutex_lock(&dlci_ioctl_mutex);
1016 if (dlci_ioctl_hook)
1017 err = dlci_ioctl_hook(cmd, argp);
1018 mutex_unlock(&dlci_ioctl_mutex);
1021 err = sock_do_ioctl(net, sock, cmd, arg);
1027 int sock_create_lite(int family, int type, int protocol, struct socket **res)
1030 struct socket *sock = NULL;
1032 err = security_socket_create(family, type, protocol, 1);
1036 sock = sock_alloc();
1043 err = security_socket_post_create(sock, family, type, protocol, 1);
1055 EXPORT_SYMBOL(sock_create_lite);
1057 /* No kernel lock held - perfect */
1058 static unsigned int sock_poll(struct file *file, poll_table *wait)
1060 unsigned int busy_flag = 0;
1061 struct socket *sock;
1064 * We can't return errors to poll, so it's either yes or no.
1066 sock = file->private_data;
1068 if (sk_can_busy_loop(sock->sk)) {
1069 /* this socket can poll_ll so tell the system call */
1070 busy_flag = POLL_BUSY_LOOP;
1072 /* once, only if requested by syscall */
1073 if (wait && (wait->_key & POLL_BUSY_LOOP))
1074 sk_busy_loop(sock->sk, 1);
1077 return busy_flag | sock->ops->poll(file, sock, wait);
1080 static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1082 struct socket *sock = file->private_data;
1084 return sock->ops->mmap(file, sock, vma);
1087 static int sock_close(struct inode *inode, struct file *filp)
1089 sock_release(SOCKET_I(inode));
1094 * Update the socket async list
1096 * Fasync_list locking strategy.
1098 * 1. fasync_list is modified only under process context socket lock
1099 * i.e. under semaphore.
1100 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1101 * or under socket lock
1104 static int sock_fasync(int fd, struct file *filp, int on)
1106 struct socket *sock = filp->private_data;
1107 struct sock *sk = sock->sk;
1108 struct socket_wq *wq;
1114 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1115 fasync_helper(fd, filp, on, &wq->fasync_list);
1117 if (!wq->fasync_list)
1118 sock_reset_flag(sk, SOCK_FASYNC);
1120 sock_set_flag(sk, SOCK_FASYNC);
1126 /* This function may be called only under socket lock or callback_lock or rcu_lock */
1128 int sock_wake_async(struct socket *sock, int how, int band)
1130 struct socket_wq *wq;
1135 wq = rcu_dereference(sock->wq);
1136 if (!wq || !wq->fasync_list) {
1141 case SOCK_WAKE_WAITD:
1142 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1145 case SOCK_WAKE_SPACE:
1146 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1151 kill_fasync(&wq->fasync_list, SIGIO, band);
1154 kill_fasync(&wq->fasync_list, SIGURG, band);
1159 EXPORT_SYMBOL(sock_wake_async);
1161 int __sock_create(struct net *net, int family, int type, int protocol,
1162 struct socket **res, int kern)
1165 struct socket *sock;
1166 const struct net_proto_family *pf;
1169 * Check protocol is in range
1171 if (family < 0 || family >= NPROTO)
1172 return -EAFNOSUPPORT;
1173 if (type < 0 || type >= SOCK_MAX)
1178 This uglymoron is moved from INET layer to here to avoid
1179 deadlock in module load.
1181 if (family == PF_INET && type == SOCK_PACKET) {
1185 pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1191 err = security_socket_create(family, type, protocol, kern);
1196 * Allocate the socket and allow the family to set things up. if
1197 * the protocol is 0, the family is instructed to select an appropriate
1200 sock = sock_alloc();
1202 net_warn_ratelimited("socket: no more sockets\n");
1203 return -ENFILE; /* Not exactly a match, but its the
1204 closest posix thing */
1209 #ifdef CONFIG_MODULES
1210 /* Attempt to load a protocol module if the find failed.
1212 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1213 * requested real, full-featured networking support upon configuration.
1214 * Otherwise module support will break!
1216 if (rcu_access_pointer(net_families[family]) == NULL)
1217 request_module("net-pf-%d", family);
1221 pf = rcu_dereference(net_families[family]);
1222 err = -EAFNOSUPPORT;
1227 * We will call the ->create function, that possibly is in a loadable
1228 * module, so we have to bump that loadable module refcnt first.
1230 if (!try_module_get(pf->owner))
1233 /* Now protected by module ref count */
1236 err = pf->create(net, sock, protocol, kern);
1238 goto out_module_put;
1241 * Now to bump the refcnt of the [loadable] module that owns this
1242 * socket at sock_release time we decrement its refcnt.
1244 if (!try_module_get(sock->ops->owner))
1245 goto out_module_busy;
1248 * Now that we're done with the ->create function, the [loadable]
1249 * module can have its refcnt decremented
1251 module_put(pf->owner);
1252 err = security_socket_post_create(sock, family, type, protocol, kern);
1254 goto out_sock_release;
1260 err = -EAFNOSUPPORT;
1263 module_put(pf->owner);
1270 goto out_sock_release;
1272 EXPORT_SYMBOL(__sock_create);
1274 int sock_create(int family, int type, int protocol, struct socket **res)
1276 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1278 EXPORT_SYMBOL(sock_create);
1280 int sock_create_kern(int family, int type, int protocol, struct socket **res)
1282 return __sock_create(&init_net, family, type, protocol, res, 1);
1284 EXPORT_SYMBOL(sock_create_kern);
1286 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1289 struct socket *sock;
1292 /* Check the SOCK_* constants for consistency. */
1293 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1294 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1295 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1296 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1298 flags = type & ~SOCK_TYPE_MASK;
1299 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1301 type &= SOCK_TYPE_MASK;
1303 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1304 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1306 retval = sock_create(family, type, protocol, &sock);
1310 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
1315 /* It may be already another descriptor 8) Not kernel problem. */
1324 * Create a pair of connected sockets.
1327 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1328 int __user *, usockvec)
1330 struct socket *sock1, *sock2;
1332 struct file *newfile1, *newfile2;
1335 flags = type & ~SOCK_TYPE_MASK;
1336 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1338 type &= SOCK_TYPE_MASK;
1340 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1341 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1344 * Obtain the first socket and check if the underlying protocol
1345 * supports the socketpair call.
1348 err = sock_create(family, type, protocol, &sock1);
1352 err = sock_create(family, type, protocol, &sock2);
1356 err = sock1->ops->socketpair(sock1, sock2);
1358 goto out_release_both;
1360 fd1 = get_unused_fd_flags(flags);
1361 if (unlikely(fd1 < 0)) {
1363 goto out_release_both;
1366 fd2 = get_unused_fd_flags(flags);
1367 if (unlikely(fd2 < 0)) {
1369 goto out_put_unused_1;
1372 newfile1 = sock_alloc_file(sock1, flags, NULL);
1373 if (unlikely(IS_ERR(newfile1))) {
1374 err = PTR_ERR(newfile1);
1375 goto out_put_unused_both;
1378 newfile2 = sock_alloc_file(sock2, flags, NULL);
1379 if (IS_ERR(newfile2)) {
1380 err = PTR_ERR(newfile2);
1384 err = put_user(fd1, &usockvec[0]);
1388 err = put_user(fd2, &usockvec[1]);
1392 audit_fd_pair(fd1, fd2);
1394 fd_install(fd1, newfile1);
1395 fd_install(fd2, newfile2);
1396 /* fd1 and fd2 may be already another descriptors.
1397 * Not kernel problem.
1413 sock_release(sock2);
1416 out_put_unused_both:
1421 sock_release(sock2);
1423 sock_release(sock1);
1429 * Bind a name to a socket. Nothing much to do here since it's
1430 * the protocol's responsibility to handle the local address.
1432 * We move the socket address to kernel space before we call
1433 * the protocol layer (having also checked the address is ok).
1436 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1438 struct socket *sock;
1439 struct sockaddr_storage address;
1440 int err, fput_needed;
1442 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1444 err = move_addr_to_kernel(umyaddr, addrlen, &address);
1446 err = security_socket_bind(sock,
1447 (struct sockaddr *)&address,
1450 err = sock->ops->bind(sock,
1454 fput_light(sock->file, fput_needed);
1460 * Perform a listen. Basically, we allow the protocol to do anything
1461 * necessary for a listen, and if that works, we mark the socket as
1462 * ready for listening.
1465 SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1467 struct socket *sock;
1468 int err, fput_needed;
1471 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1473 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1474 if ((unsigned int)backlog > somaxconn)
1475 backlog = somaxconn;
1477 err = security_socket_listen(sock, backlog);
1479 err = sock->ops->listen(sock, backlog);
1481 fput_light(sock->file, fput_needed);
1487 * For accept, we attempt to create a new socket, set up the link
1488 * with the client, wake up the client, then return the new
1489 * connected fd. We collect the address of the connector in kernel
1490 * space and move it to user at the very end. This is unclean because
1491 * we open the socket then return an error.
1493 * 1003.1g adds the ability to recvmsg() to query connection pending
1494 * status to recvmsg. We need to add that support in a way thats
1495 * clean when we restucture accept also.
1498 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1499 int __user *, upeer_addrlen, int, flags)
1501 struct socket *sock, *newsock;
1502 struct file *newfile;
1503 int err, len, newfd, fput_needed;
1504 struct sockaddr_storage address;
1506 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1509 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1510 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1512 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1517 newsock = sock_alloc();
1521 newsock->type = sock->type;
1522 newsock->ops = sock->ops;
1525 * We don't need try_module_get here, as the listening socket (sock)
1526 * has the protocol module (sock->ops->owner) held.
1528 __module_get(newsock->ops->owner);
1530 newfd = get_unused_fd_flags(flags);
1531 if (unlikely(newfd < 0)) {
1533 sock_release(newsock);
1536 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1537 if (unlikely(IS_ERR(newfile))) {
1538 err = PTR_ERR(newfile);
1539 put_unused_fd(newfd);
1540 sock_release(newsock);
1544 err = security_socket_accept(sock, newsock);
1548 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1552 if (upeer_sockaddr) {
1553 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1555 err = -ECONNABORTED;
1558 err = move_addr_to_user(&address,
1559 len, upeer_sockaddr, upeer_addrlen);
1564 /* File flags are not inherited via accept() unlike another OSes. */
1566 fd_install(newfd, newfile);
1570 fput_light(sock->file, fput_needed);
1575 put_unused_fd(newfd);
1579 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1580 int __user *, upeer_addrlen)
1582 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1586 * Attempt to connect to a socket with the server address. The address
1587 * is in user space so we verify it is OK and move it to kernel space.
1589 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1592 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1593 * other SEQPACKET protocols that take time to connect() as it doesn't
1594 * include the -EINPROGRESS status for such sockets.
1597 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1600 struct socket *sock;
1601 struct sockaddr_storage address;
1602 int err, fput_needed;
1604 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1607 err = move_addr_to_kernel(uservaddr, addrlen, &address);
1612 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1616 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1617 sock->file->f_flags);
1619 fput_light(sock->file, fput_needed);
1625 * Get the local address ('name') of a socket object. Move the obtained
1626 * name to user space.
1629 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1630 int __user *, usockaddr_len)
1632 struct socket *sock;
1633 struct sockaddr_storage address;
1634 int len, err, fput_needed;
1636 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1640 err = security_socket_getsockname(sock);
1644 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1647 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
1650 fput_light(sock->file, fput_needed);
1656 * Get the remote address ('name') of a socket object. Move the obtained
1657 * name to user space.
1660 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1661 int __user *, usockaddr_len)
1663 struct socket *sock;
1664 struct sockaddr_storage address;
1665 int len, err, fput_needed;
1667 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1669 err = security_socket_getpeername(sock);
1671 fput_light(sock->file, fput_needed);
1676 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1679 err = move_addr_to_user(&address, len, usockaddr,
1681 fput_light(sock->file, fput_needed);
1687 * Send a datagram to a given address. We move the address into kernel
1688 * space and check the user space data area is readable before invoking
1692 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1693 unsigned int, flags, struct sockaddr __user *, addr,
1696 struct socket *sock;
1697 struct sockaddr_storage address;
1705 if (unlikely(!access_ok(VERIFY_READ, buff, len)))
1707 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1711 iov.iov_base = buff;
1713 msg.msg_name = NULL;
1714 iov_iter_init(&msg.msg_iter, WRITE, &iov, 1, len);
1715 msg.msg_control = NULL;
1716 msg.msg_controllen = 0;
1717 msg.msg_namelen = 0;
1719 err = move_addr_to_kernel(addr, addr_len, &address);
1722 msg.msg_name = (struct sockaddr *)&address;
1723 msg.msg_namelen = addr_len;
1725 if (sock->file->f_flags & O_NONBLOCK)
1726 flags |= MSG_DONTWAIT;
1727 msg.msg_flags = flags;
1728 err = sock_sendmsg(sock, &msg, len);
1731 fput_light(sock->file, fput_needed);
1737 * Send a datagram down a socket.
1740 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1741 unsigned int, flags)
1743 return sys_sendto(fd, buff, len, flags, NULL, 0);
1747 * Receive a frame from the socket and optionally record the address of the
1748 * sender. We verify the buffers are writable and if needed move the
1749 * sender address from kernel to user space.
1752 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1753 unsigned int, flags, struct sockaddr __user *, addr,
1754 int __user *, addr_len)
1756 struct socket *sock;
1759 struct sockaddr_storage address;
1765 if (unlikely(!access_ok(VERIFY_WRITE, ubuf, size)))
1767 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1771 msg.msg_control = NULL;
1772 msg.msg_controllen = 0;
1774 iov.iov_base = ubuf;
1775 iov_iter_init(&msg.msg_iter, READ, &iov, 1, size);
1776 /* Save some cycles and don't copy the address if not needed */
1777 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1778 /* We assume all kernel code knows the size of sockaddr_storage */
1779 msg.msg_namelen = 0;
1780 if (sock->file->f_flags & O_NONBLOCK)
1781 flags |= MSG_DONTWAIT;
1782 err = sock_recvmsg(sock, &msg, size, flags);
1784 if (err >= 0 && addr != NULL) {
1785 err2 = move_addr_to_user(&address,
1786 msg.msg_namelen, addr, addr_len);
1791 fput_light(sock->file, fput_needed);
1797 * Receive a datagram from a socket.
1800 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1801 unsigned int, flags)
1803 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1807 * Set a socket option. Because we don't know the option lengths we have
1808 * to pass the user mode parameter for the protocols to sort out.
1811 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1812 char __user *, optval, int, optlen)
1814 int err, fput_needed;
1815 struct socket *sock;
1820 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1822 err = security_socket_setsockopt(sock, level, optname);
1826 if (level == SOL_SOCKET)
1828 sock_setsockopt(sock, level, optname, optval,
1832 sock->ops->setsockopt(sock, level, optname, optval,
1835 fput_light(sock->file, fput_needed);
1841 * Get a socket option. Because we don't know the option lengths we have
1842 * to pass a user mode parameter for the protocols to sort out.
1845 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1846 char __user *, optval, int __user *, optlen)
1848 int err, fput_needed;
1849 struct socket *sock;
1851 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1853 err = security_socket_getsockopt(sock, level, optname);
1857 if (level == SOL_SOCKET)
1859 sock_getsockopt(sock, level, optname, optval,
1863 sock->ops->getsockopt(sock, level, optname, optval,
1866 fput_light(sock->file, fput_needed);
1872 * Shutdown a socket.
1875 SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1877 int err, fput_needed;
1878 struct socket *sock;
1880 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1882 err = security_socket_shutdown(sock, how);
1884 err = sock->ops->shutdown(sock, how);
1885 fput_light(sock->file, fput_needed);
1890 /* A couple of helpful macros for getting the address of the 32/64 bit
1891 * fields which are the same type (int / unsigned) on our platforms.
1893 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1894 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1895 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1897 struct used_address {
1898 struct sockaddr_storage name;
1899 unsigned int name_len;
1902 static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
1903 struct user_msghdr __user *umsg,
1904 struct sockaddr __user **save_addr,
1907 struct sockaddr __user *uaddr;
1908 struct iovec __user *uiov;
1912 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
1913 __get_user(uaddr, &umsg->msg_name) ||
1914 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
1915 __get_user(uiov, &umsg->msg_iov) ||
1916 __get_user(nr_segs, &umsg->msg_iovlen) ||
1917 __get_user(kmsg->msg_control, &umsg->msg_control) ||
1918 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
1919 __get_user(kmsg->msg_flags, &umsg->msg_flags))
1923 kmsg->msg_namelen = 0;
1925 if (kmsg->msg_namelen < 0)
1928 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
1929 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
1934 if (uaddr && kmsg->msg_namelen) {
1936 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
1942 kmsg->msg_name = NULL;
1943 kmsg->msg_namelen = 0;
1946 if (nr_segs > UIO_MAXIOV)
1949 err = rw_copy_check_uvector(save_addr ? READ : WRITE,
1951 UIO_FASTIOV, *iov, iov);
1953 iov_iter_init(&kmsg->msg_iter, save_addr ? READ : WRITE,
1954 *iov, nr_segs, err);
1958 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
1959 struct msghdr *msg_sys, unsigned int flags,
1960 struct used_address *used_address)
1962 struct compat_msghdr __user *msg_compat =
1963 (struct compat_msghdr __user *)msg;
1964 struct sockaddr_storage address;
1965 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1966 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1967 __attribute__ ((aligned(sizeof(__kernel_size_t))));
1968 /* 20 is size of ipv6_pktinfo */
1969 unsigned char *ctl_buf = ctl;
1970 int ctl_len, total_len;
1973 msg_sys->msg_name = &address;
1975 if (MSG_CMSG_COMPAT & flags)
1976 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
1978 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
1985 if (msg_sys->msg_controllen > INT_MAX)
1987 ctl_len = msg_sys->msg_controllen;
1988 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1990 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
1994 ctl_buf = msg_sys->msg_control;
1995 ctl_len = msg_sys->msg_controllen;
1996 } else if (ctl_len) {
1997 if (ctl_len > sizeof(ctl)) {
1998 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1999 if (ctl_buf == NULL)
2004 * Careful! Before this, msg_sys->msg_control contains a user pointer.
2005 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2006 * checking falls down on this.
2008 if (copy_from_user(ctl_buf,
2009 (void __user __force *)msg_sys->msg_control,
2012 msg_sys->msg_control = ctl_buf;
2014 msg_sys->msg_flags = flags;
2016 if (sock->file->f_flags & O_NONBLOCK)
2017 msg_sys->msg_flags |= MSG_DONTWAIT;
2019 * If this is sendmmsg() and current destination address is same as
2020 * previously succeeded address, omit asking LSM's decision.
2021 * used_address->name_len is initialized to UINT_MAX so that the first
2022 * destination address never matches.
2024 if (used_address && msg_sys->msg_name &&
2025 used_address->name_len == msg_sys->msg_namelen &&
2026 !memcmp(&used_address->name, msg_sys->msg_name,
2027 used_address->name_len)) {
2028 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
2031 err = sock_sendmsg(sock, msg_sys, total_len);
2033 * If this is sendmmsg() and sending to current destination address was
2034 * successful, remember it.
2036 if (used_address && err >= 0) {
2037 used_address->name_len = msg_sys->msg_namelen;
2038 if (msg_sys->msg_name)
2039 memcpy(&used_address->name, msg_sys->msg_name,
2040 used_address->name_len);
2045 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2047 if (iov != iovstack)
2053 * BSD sendmsg interface
2056 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
2058 int fput_needed, err;
2059 struct msghdr msg_sys;
2060 struct socket *sock;
2062 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2066 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2068 fput_light(sock->file, fput_needed);
2073 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
2075 if (flags & MSG_CMSG_COMPAT)
2077 return __sys_sendmsg(fd, msg, flags);
2081 * Linux sendmmsg interface
2084 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2087 int fput_needed, err, datagrams;
2088 struct socket *sock;
2089 struct mmsghdr __user *entry;
2090 struct compat_mmsghdr __user *compat_entry;
2091 struct msghdr msg_sys;
2092 struct used_address used_address;
2094 if (vlen > UIO_MAXIOV)
2099 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2103 used_address.name_len = UINT_MAX;
2105 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2108 while (datagrams < vlen) {
2109 if (MSG_CMSG_COMPAT & flags) {
2110 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
2111 &msg_sys, flags, &used_address);
2114 err = __put_user(err, &compat_entry->msg_len);
2117 err = ___sys_sendmsg(sock,
2118 (struct user_msghdr __user *)entry,
2119 &msg_sys, flags, &used_address);
2122 err = put_user(err, &entry->msg_len);
2131 fput_light(sock->file, fput_needed);
2133 /* We only return an error if no datagrams were able to be sent */
2140 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2141 unsigned int, vlen, unsigned int, flags)
2143 if (flags & MSG_CMSG_COMPAT)
2145 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2148 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
2149 struct msghdr *msg_sys, unsigned int flags, int nosec)
2151 struct compat_msghdr __user *msg_compat =
2152 (struct compat_msghdr __user *)msg;
2153 struct iovec iovstack[UIO_FASTIOV];
2154 struct iovec *iov = iovstack;
2155 unsigned long cmsg_ptr;
2159 /* kernel mode address */
2160 struct sockaddr_storage addr;
2162 /* user mode address pointers */
2163 struct sockaddr __user *uaddr;
2164 int __user *uaddr_len = COMPAT_NAMELEN(msg);
2166 msg_sys->msg_name = &addr;
2168 if (MSG_CMSG_COMPAT & flags)
2169 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
2171 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
2176 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2177 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2179 /* We assume all kernel code knows the size of sockaddr_storage */
2180 msg_sys->msg_namelen = 0;
2182 if (sock->file->f_flags & O_NONBLOCK)
2183 flags |= MSG_DONTWAIT;
2184 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2190 if (uaddr != NULL) {
2191 err = move_addr_to_user(&addr,
2192 msg_sys->msg_namelen, uaddr,
2197 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2201 if (MSG_CMSG_COMPAT & flags)
2202 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2203 &msg_compat->msg_controllen);
2205 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2206 &msg->msg_controllen);
2212 if (iov != iovstack)
2218 * BSD recvmsg interface
2221 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
2223 int fput_needed, err;
2224 struct msghdr msg_sys;
2225 struct socket *sock;
2227 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2231 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2233 fput_light(sock->file, fput_needed);
2238 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
2239 unsigned int, flags)
2241 if (flags & MSG_CMSG_COMPAT)
2243 return __sys_recvmsg(fd, msg, flags);
2247 * Linux recvmmsg interface
2250 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2251 unsigned int flags, struct timespec *timeout)
2253 int fput_needed, err, datagrams;
2254 struct socket *sock;
2255 struct mmsghdr __user *entry;
2256 struct compat_mmsghdr __user *compat_entry;
2257 struct msghdr msg_sys;
2258 struct timespec end_time;
2261 poll_select_set_timeout(&end_time, timeout->tv_sec,
2267 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2271 err = sock_error(sock->sk);
2276 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2278 while (datagrams < vlen) {
2280 * No need to ask LSM for more than the first datagram.
2282 if (MSG_CMSG_COMPAT & flags) {
2283 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
2284 &msg_sys, flags & ~MSG_WAITFORONE,
2288 err = __put_user(err, &compat_entry->msg_len);
2291 err = ___sys_recvmsg(sock,
2292 (struct user_msghdr __user *)entry,
2293 &msg_sys, flags & ~MSG_WAITFORONE,
2297 err = put_user(err, &entry->msg_len);
2305 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2306 if (flags & MSG_WAITFORONE)
2307 flags |= MSG_DONTWAIT;
2310 ktime_get_ts(timeout);
2311 *timeout = timespec_sub(end_time, *timeout);
2312 if (timeout->tv_sec < 0) {
2313 timeout->tv_sec = timeout->tv_nsec = 0;
2317 /* Timeout, return less than vlen datagrams */
2318 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2322 /* Out of band data, return right away */
2323 if (msg_sys.msg_flags & MSG_OOB)
2328 fput_light(sock->file, fput_needed);
2333 if (datagrams != 0) {
2335 * We may return less entries than requested (vlen) if the
2336 * sock is non block and there aren't enough datagrams...
2338 if (err != -EAGAIN) {
2340 * ... or if recvmsg returns an error after we
2341 * received some datagrams, where we record the
2342 * error to return on the next call or if the
2343 * app asks about it using getsockopt(SO_ERROR).
2345 sock->sk->sk_err = -err;
2354 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2355 unsigned int, vlen, unsigned int, flags,
2356 struct timespec __user *, timeout)
2359 struct timespec timeout_sys;
2361 if (flags & MSG_CMSG_COMPAT)
2365 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2367 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2370 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2372 if (datagrams > 0 &&
2373 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2374 datagrams = -EFAULT;
2379 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2380 /* Argument list sizes for sys_socketcall */
2381 #define AL(x) ((x) * sizeof(unsigned long))
2382 static const unsigned char nargs[21] = {
2383 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2384 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2385 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2392 * System call vectors.
2394 * Argument checking cleaned up. Saved 20% in size.
2395 * This function doesn't need to set the kernel lock because
2396 * it is set by the callees.
2399 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2401 unsigned long a[AUDITSC_ARGS];
2402 unsigned long a0, a1;
2406 if (call < 1 || call > SYS_SENDMMSG)
2410 if (len > sizeof(a))
2413 /* copy_from_user should be SMP safe. */
2414 if (copy_from_user(a, args, len))
2417 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2426 err = sys_socket(a0, a1, a[2]);
2429 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2432 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2435 err = sys_listen(a0, a1);
2438 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2439 (int __user *)a[2], 0);
2441 case SYS_GETSOCKNAME:
2443 sys_getsockname(a0, (struct sockaddr __user *)a1,
2444 (int __user *)a[2]);
2446 case SYS_GETPEERNAME:
2448 sys_getpeername(a0, (struct sockaddr __user *)a1,
2449 (int __user *)a[2]);
2451 case SYS_SOCKETPAIR:
2452 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2455 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2458 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2459 (struct sockaddr __user *)a[4], a[5]);
2462 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2465 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2466 (struct sockaddr __user *)a[4],
2467 (int __user *)a[5]);
2470 err = sys_shutdown(a0, a1);
2472 case SYS_SETSOCKOPT:
2473 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2475 case SYS_GETSOCKOPT:
2477 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2478 (int __user *)a[4]);
2481 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
2484 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2487 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
2490 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2491 (struct timespec __user *)a[4]);
2494 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2495 (int __user *)a[2], a[3]);
2504 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
2507 * sock_register - add a socket protocol handler
2508 * @ops: description of protocol
2510 * This function is called by a protocol handler that wants to
2511 * advertise its address family, and have it linked into the
2512 * socket interface. The value ops->family corresponds to the
2513 * socket system call protocol family.
2515 int sock_register(const struct net_proto_family *ops)
2519 if (ops->family >= NPROTO) {
2520 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
2524 spin_lock(&net_family_lock);
2525 if (rcu_dereference_protected(net_families[ops->family],
2526 lockdep_is_held(&net_family_lock)))
2529 rcu_assign_pointer(net_families[ops->family], ops);
2532 spin_unlock(&net_family_lock);
2534 pr_info("NET: Registered protocol family %d\n", ops->family);
2537 EXPORT_SYMBOL(sock_register);
2540 * sock_unregister - remove a protocol handler
2541 * @family: protocol family to remove
2543 * This function is called by a protocol handler that wants to
2544 * remove its address family, and have it unlinked from the
2545 * new socket creation.
2547 * If protocol handler is a module, then it can use module reference
2548 * counts to protect against new references. If protocol handler is not
2549 * a module then it needs to provide its own protection in
2550 * the ops->create routine.
2552 void sock_unregister(int family)
2554 BUG_ON(family < 0 || family >= NPROTO);
2556 spin_lock(&net_family_lock);
2557 RCU_INIT_POINTER(net_families[family], NULL);
2558 spin_unlock(&net_family_lock);
2562 pr_info("NET: Unregistered protocol family %d\n", family);
2564 EXPORT_SYMBOL(sock_unregister);
2566 static int __init sock_init(void)
2570 * Initialize the network sysctl infrastructure.
2572 err = net_sysctl_init();
2577 * Initialize skbuff SLAB cache
2582 * Initialize the protocols module.
2587 err = register_filesystem(&sock_fs_type);
2590 sock_mnt = kern_mount(&sock_fs_type);
2591 if (IS_ERR(sock_mnt)) {
2592 err = PTR_ERR(sock_mnt);
2596 /* The real protocol initialization is performed in later initcalls.
2599 #ifdef CONFIG_NETFILTER
2600 err = netfilter_init();
2605 ptp_classifier_init();
2611 unregister_filesystem(&sock_fs_type);
2616 core_initcall(sock_init); /* early initcall */
2618 #ifdef CONFIG_PROC_FS
2619 void socket_seq_show(struct seq_file *seq)
2624 for_each_possible_cpu(cpu)
2625 counter += per_cpu(sockets_in_use, cpu);
2627 /* It can be negative, by the way. 8) */
2631 seq_printf(seq, "sockets: used %d\n", counter);
2633 #endif /* CONFIG_PROC_FS */
2635 #ifdef CONFIG_COMPAT
2636 static int do_siocgstamp(struct net *net, struct socket *sock,
2637 unsigned int cmd, void __user *up)
2639 mm_segment_t old_fs = get_fs();
2644 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2647 err = compat_put_timeval(&ktv, up);
2652 static int do_siocgstampns(struct net *net, struct socket *sock,
2653 unsigned int cmd, void __user *up)
2655 mm_segment_t old_fs = get_fs();
2656 struct timespec kts;
2660 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2663 err = compat_put_timespec(&kts, up);
2668 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2670 struct ifreq __user *uifr;
2673 uifr = compat_alloc_user_space(sizeof(struct ifreq));
2674 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2677 err = dev_ioctl(net, SIOCGIFNAME, uifr);
2681 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2687 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2689 struct compat_ifconf ifc32;
2691 struct ifconf __user *uifc;
2692 struct compat_ifreq __user *ifr32;
2693 struct ifreq __user *ifr;
2697 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2700 memset(&ifc, 0, sizeof(ifc));
2701 if (ifc32.ifcbuf == 0) {
2705 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2707 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2708 sizeof(struct ifreq);
2709 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2711 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2712 ifr32 = compat_ptr(ifc32.ifcbuf);
2713 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2714 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2720 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2723 err = dev_ioctl(net, SIOCGIFCONF, uifc);
2727 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2731 ifr32 = compat_ptr(ifc32.ifcbuf);
2733 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2734 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2735 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2741 if (ifc32.ifcbuf == 0) {
2742 /* Translate from 64-bit structure multiple to
2746 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2751 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2757 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2759 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2760 bool convert_in = false, convert_out = false;
2761 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2762 struct ethtool_rxnfc __user *rxnfc;
2763 struct ifreq __user *ifr;
2764 u32 rule_cnt = 0, actual_rule_cnt;
2769 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2772 compat_rxnfc = compat_ptr(data);
2774 if (get_user(ethcmd, &compat_rxnfc->cmd))
2777 /* Most ethtool structures are defined without padding.
2778 * Unfortunately struct ethtool_rxnfc is an exception.
2783 case ETHTOOL_GRXCLSRLALL:
2784 /* Buffer size is variable */
2785 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2787 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2789 buf_size += rule_cnt * sizeof(u32);
2791 case ETHTOOL_GRXRINGS:
2792 case ETHTOOL_GRXCLSRLCNT:
2793 case ETHTOOL_GRXCLSRULE:
2794 case ETHTOOL_SRXCLSRLINS:
2797 case ETHTOOL_SRXCLSRLDEL:
2798 buf_size += sizeof(struct ethtool_rxnfc);
2803 ifr = compat_alloc_user_space(buf_size);
2804 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
2806 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2809 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2810 &ifr->ifr_ifru.ifru_data))
2814 /* We expect there to be holes between fs.m_ext and
2815 * fs.ring_cookie and at the end of fs, but nowhere else.
2817 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2818 sizeof(compat_rxnfc->fs.m_ext) !=
2819 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2820 sizeof(rxnfc->fs.m_ext));
2822 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2823 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2824 offsetof(struct ethtool_rxnfc, fs.location) -
2825 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2827 if (copy_in_user(rxnfc, compat_rxnfc,
2828 (void __user *)(&rxnfc->fs.m_ext + 1) -
2829 (void __user *)rxnfc) ||
2830 copy_in_user(&rxnfc->fs.ring_cookie,
2831 &compat_rxnfc->fs.ring_cookie,
2832 (void __user *)(&rxnfc->fs.location + 1) -
2833 (void __user *)&rxnfc->fs.ring_cookie) ||
2834 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2835 sizeof(rxnfc->rule_cnt)))
2839 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2844 if (copy_in_user(compat_rxnfc, rxnfc,
2845 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2846 (const void __user *)rxnfc) ||
2847 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2848 &rxnfc->fs.ring_cookie,
2849 (const void __user *)(&rxnfc->fs.location + 1) -
2850 (const void __user *)&rxnfc->fs.ring_cookie) ||
2851 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2852 sizeof(rxnfc->rule_cnt)))
2855 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2856 /* As an optimisation, we only copy the actual
2857 * number of rules that the underlying
2858 * function returned. Since Mallory might
2859 * change the rule count in user memory, we
2860 * check that it is less than the rule count
2861 * originally given (as the user buffer size),
2862 * which has been range-checked.
2864 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2866 if (actual_rule_cnt < rule_cnt)
2867 rule_cnt = actual_rule_cnt;
2868 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2869 &rxnfc->rule_locs[0],
2870 rule_cnt * sizeof(u32)))
2878 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2881 compat_uptr_t uptr32;
2882 struct ifreq __user *uifr;
2884 uifr = compat_alloc_user_space(sizeof(*uifr));
2885 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2888 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2891 uptr = compat_ptr(uptr32);
2893 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2896 return dev_ioctl(net, SIOCWANDEV, uifr);
2899 static int bond_ioctl(struct net *net, unsigned int cmd,
2900 struct compat_ifreq __user *ifr32)
2903 mm_segment_t old_fs;
2907 case SIOCBONDENSLAVE:
2908 case SIOCBONDRELEASE:
2909 case SIOCBONDSETHWADDR:
2910 case SIOCBONDCHANGEACTIVE:
2911 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2916 err = dev_ioctl(net, cmd,
2917 (struct ifreq __user __force *) &kifr);
2922 return -ENOIOCTLCMD;
2926 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2927 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
2928 struct compat_ifreq __user *u_ifreq32)
2930 struct ifreq __user *u_ifreq64;
2931 char tmp_buf[IFNAMSIZ];
2932 void __user *data64;
2935 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2938 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
2940 data64 = compat_ptr(data32);
2942 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2944 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2947 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
2950 return dev_ioctl(net, cmd, u_ifreq64);
2953 static int dev_ifsioc(struct net *net, struct socket *sock,
2954 unsigned int cmd, struct compat_ifreq __user *uifr32)
2956 struct ifreq __user *uifr;
2959 uifr = compat_alloc_user_space(sizeof(*uifr));
2960 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2963 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2974 case SIOCGIFBRDADDR:
2975 case SIOCGIFDSTADDR:
2976 case SIOCGIFNETMASK:
2981 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
2989 static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2990 struct compat_ifreq __user *uifr32)
2993 struct compat_ifmap __user *uifmap32;
2994 mm_segment_t old_fs;
2997 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2998 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
2999 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3000 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3001 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3002 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3003 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3004 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
3010 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
3013 if (cmd == SIOCGIFMAP && !err) {
3014 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
3015 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3016 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3017 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3018 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3019 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3020 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
3029 struct sockaddr rt_dst; /* target address */
3030 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3031 struct sockaddr rt_genmask; /* target network mask (IP) */
3032 unsigned short rt_flags;
3035 unsigned char rt_tos;
3036 unsigned char rt_class;
3038 short rt_metric; /* +1 for binary compatibility! */
3039 /* char * */ u32 rt_dev; /* forcing the device at add */
3040 u32 rt_mtu; /* per route MTU/Window */
3041 u32 rt_window; /* Window clamping */
3042 unsigned short rt_irtt; /* Initial RTT */
3045 struct in6_rtmsg32 {
3046 struct in6_addr rtmsg_dst;
3047 struct in6_addr rtmsg_src;
3048 struct in6_addr rtmsg_gateway;
3058 static int routing_ioctl(struct net *net, struct socket *sock,
3059 unsigned int cmd, void __user *argp)
3063 struct in6_rtmsg r6;
3067 mm_segment_t old_fs = get_fs();
3069 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3070 struct in6_rtmsg32 __user *ur6 = argp;
3071 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3072 3 * sizeof(struct in6_addr));
3073 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3074 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3075 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3076 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3077 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3078 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3079 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3083 struct rtentry32 __user *ur4 = argp;
3084 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3085 3 * sizeof(struct sockaddr));
3086 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3087 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3088 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3089 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3090 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3091 ret |= get_user(rtdev, &(ur4->rt_dev));
3093 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3094 r4.rt_dev = (char __user __force *)devname;
3108 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3115 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3116 * for some operations; this forces use of the newer bridge-utils that
3117 * use compatible ioctls
3119 static int old_bridge_ioctl(compat_ulong_t __user *argp)
3123 if (get_user(tmp, argp))
3125 if (tmp == BRCTL_GET_VERSION)
3126 return BRCTL_VERSION + 1;
3130 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3131 unsigned int cmd, unsigned long arg)
3133 void __user *argp = compat_ptr(arg);
3134 struct sock *sk = sock->sk;
3135 struct net *net = sock_net(sk);
3137 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3138 return compat_ifr_data_ioctl(net, cmd, argp);
3143 return old_bridge_ioctl(argp);
3145 return dev_ifname32(net, argp);
3147 return dev_ifconf(net, argp);
3149 return ethtool_ioctl(net, argp);
3151 return compat_siocwandev(net, argp);
3154 return compat_sioc_ifmap(net, cmd, argp);
3155 case SIOCBONDENSLAVE:
3156 case SIOCBONDRELEASE:
3157 case SIOCBONDSETHWADDR:
3158 case SIOCBONDCHANGEACTIVE:
3159 return bond_ioctl(net, cmd, argp);
3162 return routing_ioctl(net, sock, cmd, argp);
3164 return do_siocgstamp(net, sock, cmd, argp);
3166 return do_siocgstampns(net, sock, cmd, argp);
3167 case SIOCBONDSLAVEINFOQUERY:
3168 case SIOCBONDINFOQUERY:
3171 return compat_ifr_data_ioctl(net, cmd, argp);
3183 return sock_ioctl(file, cmd, arg);
3200 case SIOCSIFHWBROADCAST:
3202 case SIOCGIFBRDADDR:
3203 case SIOCSIFBRDADDR:
3204 case SIOCGIFDSTADDR:
3205 case SIOCSIFDSTADDR:
3206 case SIOCGIFNETMASK:
3207 case SIOCSIFNETMASK:
3218 return dev_ifsioc(net, sock, cmd, argp);
3224 return sock_do_ioctl(net, sock, cmd, arg);
3227 return -ENOIOCTLCMD;
3230 static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3233 struct socket *sock = file->private_data;
3234 int ret = -ENOIOCTLCMD;
3241 if (sock->ops->compat_ioctl)
3242 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3244 if (ret == -ENOIOCTLCMD &&
3245 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3246 ret = compat_wext_handle_ioctl(net, cmd, arg);
3248 if (ret == -ENOIOCTLCMD)
3249 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3255 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3257 return sock->ops->bind(sock, addr, addrlen);
3259 EXPORT_SYMBOL(kernel_bind);
3261 int kernel_listen(struct socket *sock, int backlog)
3263 return sock->ops->listen(sock, backlog);
3265 EXPORT_SYMBOL(kernel_listen);
3267 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3269 struct sock *sk = sock->sk;
3272 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3277 err = sock->ops->accept(sock, *newsock, flags);
3279 sock_release(*newsock);
3284 (*newsock)->ops = sock->ops;
3285 __module_get((*newsock)->ops->owner);
3290 EXPORT_SYMBOL(kernel_accept);
3292 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3295 return sock->ops->connect(sock, addr, addrlen, flags);
3297 EXPORT_SYMBOL(kernel_connect);
3299 int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3302 return sock->ops->getname(sock, addr, addrlen, 0);
3304 EXPORT_SYMBOL(kernel_getsockname);
3306 int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3309 return sock->ops->getname(sock, addr, addrlen, 1);
3311 EXPORT_SYMBOL(kernel_getpeername);
3313 int kernel_getsockopt(struct socket *sock, int level, int optname,
3314 char *optval, int *optlen)
3316 mm_segment_t oldfs = get_fs();
3317 char __user *uoptval;
3318 int __user *uoptlen;
3321 uoptval = (char __user __force *) optval;
3322 uoptlen = (int __user __force *) optlen;
3325 if (level == SOL_SOCKET)
3326 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3328 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3333 EXPORT_SYMBOL(kernel_getsockopt);
3335 int kernel_setsockopt(struct socket *sock, int level, int optname,
3336 char *optval, unsigned int optlen)
3338 mm_segment_t oldfs = get_fs();
3339 char __user *uoptval;
3342 uoptval = (char __user __force *) optval;
3345 if (level == SOL_SOCKET)
3346 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3348 err = sock->ops->setsockopt(sock, level, optname, uoptval,
3353 EXPORT_SYMBOL(kernel_setsockopt);
3355 int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3356 size_t size, int flags)
3358 if (sock->ops->sendpage)
3359 return sock->ops->sendpage(sock, page, offset, size, flags);
3361 return sock_no_sendpage(sock, page, offset, size, flags);
3363 EXPORT_SYMBOL(kernel_sendpage);
3365 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3367 mm_segment_t oldfs = get_fs();
3371 err = sock->ops->ioctl(sock, cmd, arg);
3376 EXPORT_SYMBOL(kernel_sock_ioctl);
3378 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3380 return sock->ops->shutdown(sock, how);
3382 EXPORT_SYMBOL(kernel_sock_shutdown);