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 int sock_no_open(struct inode *irrelevant, struct file *dontcare);
117 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
118 unsigned long nr_segs, loff_t pos);
119 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
120 unsigned long nr_segs, loff_t pos);
121 static int sock_mmap(struct file *file, struct vm_area_struct *vma);
123 static int sock_close(struct inode *inode, struct file *file);
124 static unsigned int sock_poll(struct file *file,
125 struct poll_table_struct *wait);
126 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
128 static long compat_sock_ioctl(struct file *file,
129 unsigned int cmd, unsigned long arg);
131 static int sock_fasync(int fd, struct file *filp, int on);
132 static ssize_t sock_sendpage(struct file *file, struct page *page,
133 int offset, size_t size, loff_t *ppos, int more);
134 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
135 struct pipe_inode_info *pipe, size_t len,
139 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
140 * in the operation structures but are done directly via the socketcall() multiplexor.
143 static const struct file_operations socket_file_ops = {
144 .owner = THIS_MODULE,
146 .aio_read = sock_aio_read,
147 .aio_write = sock_aio_write,
149 .unlocked_ioctl = sock_ioctl,
151 .compat_ioctl = compat_sock_ioctl,
154 .open = sock_no_open, /* special open code to disallow open via /proc */
155 .release = sock_close,
156 .fasync = sock_fasync,
157 .sendpage = sock_sendpage,
158 .splice_write = generic_splice_sendpage,
159 .splice_read = sock_splice_read,
163 * The protocol list. Each protocol is registered in here.
166 static DEFINE_SPINLOCK(net_family_lock);
167 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
170 * Statistics counters of the socket lists
173 static DEFINE_PER_CPU(int, sockets_in_use);
177 * Move socket addresses back and forth across the kernel/user
178 * divide and look after the messy bits.
182 * move_addr_to_kernel - copy a socket address into kernel space
183 * @uaddr: Address in user space
184 * @kaddr: Address in kernel space
185 * @ulen: Length in user space
187 * The address is copied into kernel space. If the provided address is
188 * too long an error code of -EINVAL is returned. If the copy gives
189 * invalid addresses -EFAULT is returned. On a success 0 is returned.
192 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
194 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
198 if (copy_from_user(kaddr, uaddr, ulen))
200 return audit_sockaddr(ulen, kaddr);
204 * move_addr_to_user - copy an address to user space
205 * @kaddr: kernel space address
206 * @klen: length of address in kernel
207 * @uaddr: user space address
208 * @ulen: pointer to user length field
210 * The value pointed to by ulen on entry is the buffer length available.
211 * This is overwritten with the buffer space used. -EINVAL is returned
212 * if an overlong buffer is specified or a negative buffer size. -EFAULT
213 * is returned if either the buffer or the length field are not
215 * After copying the data up to the limit the user specifies, the true
216 * length of the data is written over the length limit the user
217 * specified. Zero is returned for a success.
220 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
221 void __user *uaddr, int __user *ulen)
226 BUG_ON(klen > sizeof(struct sockaddr_storage));
227 err = get_user(len, ulen);
235 if (audit_sockaddr(klen, kaddr))
237 if (copy_to_user(uaddr, kaddr, len))
241 * "fromlen shall refer to the value before truncation.."
244 return __put_user(klen, ulen);
247 static struct kmem_cache *sock_inode_cachep __read_mostly;
249 static struct inode *sock_alloc_inode(struct super_block *sb)
251 struct socket_alloc *ei;
252 struct socket_wq *wq;
254 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
257 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
259 kmem_cache_free(sock_inode_cachep, ei);
262 init_waitqueue_head(&wq->wait);
263 wq->fasync_list = NULL;
264 RCU_INIT_POINTER(ei->socket.wq, wq);
266 ei->socket.state = SS_UNCONNECTED;
267 ei->socket.flags = 0;
268 ei->socket.ops = NULL;
269 ei->socket.sk = NULL;
270 ei->socket.file = NULL;
272 return &ei->vfs_inode;
275 static void sock_destroy_inode(struct inode *inode)
277 struct socket_alloc *ei;
278 struct socket_wq *wq;
280 ei = container_of(inode, struct socket_alloc, vfs_inode);
281 wq = rcu_dereference_protected(ei->socket.wq, 1);
283 kmem_cache_free(sock_inode_cachep, ei);
286 static void init_once(void *foo)
288 struct socket_alloc *ei = (struct socket_alloc *)foo;
290 inode_init_once(&ei->vfs_inode);
293 static int init_inodecache(void)
295 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
296 sizeof(struct socket_alloc),
298 (SLAB_HWCACHE_ALIGN |
299 SLAB_RECLAIM_ACCOUNT |
302 if (sock_inode_cachep == NULL)
307 static const struct super_operations sockfs_ops = {
308 .alloc_inode = sock_alloc_inode,
309 .destroy_inode = sock_destroy_inode,
310 .statfs = simple_statfs,
314 * sockfs_dname() is called from d_path().
316 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
318 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
319 dentry->d_inode->i_ino);
322 static const struct dentry_operations sockfs_dentry_operations = {
323 .d_dname = sockfs_dname,
326 static struct dentry *sockfs_mount(struct file_system_type *fs_type,
327 int flags, const char *dev_name, void *data)
329 return mount_pseudo(fs_type, "socket:", &sockfs_ops,
330 &sockfs_dentry_operations, SOCKFS_MAGIC);
333 static struct vfsmount *sock_mnt __read_mostly;
335 static struct file_system_type sock_fs_type = {
337 .mount = sockfs_mount,
338 .kill_sb = kill_anon_super,
342 * Obtains the first available file descriptor and sets it up for use.
344 * These functions create file structures and maps them to fd space
345 * of the current process. On success it returns file descriptor
346 * and file struct implicitly stored in sock->file.
347 * Note that another thread may close file descriptor before we return
348 * from this function. We use the fact that now we do not refer
349 * to socket after mapping. If one day we will need it, this
350 * function will increment ref. count on file by 1.
352 * In any case returned fd MAY BE not valid!
353 * This race condition is unavoidable
354 * with shared fd spaces, we cannot solve it inside kernel,
355 * but we take care of internal coherence yet.
358 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
360 struct qstr name = { .name = "" };
366 name.len = strlen(name.name);
367 } else if (sock->sk) {
368 name.name = sock->sk->sk_prot_creator->name;
369 name.len = strlen(name.name);
371 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
372 if (unlikely(!path.dentry))
373 return ERR_PTR(-ENOMEM);
374 path.mnt = mntget(sock_mnt);
376 d_instantiate(path.dentry, SOCK_INODE(sock));
377 SOCK_INODE(sock)->i_fop = &socket_file_ops;
379 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
381 if (unlikely(IS_ERR(file))) {
382 /* drop dentry, keep inode */
383 ihold(path.dentry->d_inode);
389 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
390 file->private_data = sock;
393 EXPORT_SYMBOL(sock_alloc_file);
395 static int sock_map_fd(struct socket *sock, int flags)
397 struct file *newfile;
398 int fd = get_unused_fd_flags(flags);
399 if (unlikely(fd < 0))
402 newfile = sock_alloc_file(sock, flags, NULL);
403 if (likely(!IS_ERR(newfile))) {
404 fd_install(fd, newfile);
409 return PTR_ERR(newfile);
412 struct socket *sock_from_file(struct file *file, int *err)
414 if (file->f_op == &socket_file_ops)
415 return file->private_data; /* set in sock_map_fd */
420 EXPORT_SYMBOL(sock_from_file);
423 * sockfd_lookup - Go from a file number to its socket slot
425 * @err: pointer to an error code return
427 * The file handle passed in is locked and the socket it is bound
428 * too is returned. If an error occurs the err pointer is overwritten
429 * with a negative errno code and NULL is returned. The function checks
430 * for both invalid handles and passing a handle which is not a socket.
432 * On a success the socket object pointer is returned.
435 struct socket *sockfd_lookup(int fd, int *err)
446 sock = sock_from_file(file, err);
451 EXPORT_SYMBOL(sockfd_lookup);
453 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
455 struct fd f = fdget(fd);
460 sock = sock_from_file(f.file, err);
462 *fput_needed = f.flags;
470 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
471 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
472 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
473 static ssize_t sockfs_getxattr(struct dentry *dentry,
474 const char *name, void *value, size_t size)
476 const char *proto_name;
481 if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
482 proto_name = dentry->d_name.name;
483 proto_size = strlen(proto_name);
487 if (proto_size + 1 > size)
490 strncpy(value, proto_name, proto_size + 1);
492 error = proto_size + 1;
499 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
505 len = security_inode_listsecurity(dentry->d_inode, buffer, size);
515 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
520 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
527 static const struct inode_operations sockfs_inode_ops = {
528 .getxattr = sockfs_getxattr,
529 .listxattr = sockfs_listxattr,
533 * sock_alloc - allocate a socket
535 * Allocate a new inode and socket object. The two are bound together
536 * and initialised. The socket is then returned. If we are out of inodes
540 static struct socket *sock_alloc(void)
545 inode = new_inode_pseudo(sock_mnt->mnt_sb);
549 sock = SOCKET_I(inode);
551 kmemcheck_annotate_bitfield(sock, type);
552 inode->i_ino = get_next_ino();
553 inode->i_mode = S_IFSOCK | S_IRWXUGO;
554 inode->i_uid = current_fsuid();
555 inode->i_gid = current_fsgid();
556 inode->i_op = &sockfs_inode_ops;
558 this_cpu_add(sockets_in_use, 1);
563 * In theory you can't get an open on this inode, but /proc provides
564 * a back door. Remember to keep it shut otherwise you'll let the
565 * creepy crawlies in.
568 static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
573 const struct file_operations bad_sock_fops = {
574 .owner = THIS_MODULE,
575 .open = sock_no_open,
576 .llseek = noop_llseek,
580 * sock_release - close a socket
581 * @sock: socket to close
583 * The socket is released from the protocol stack if it has a release
584 * callback, and the inode is then released if the socket is bound to
585 * an inode not a file.
588 void sock_release(struct socket *sock)
591 struct module *owner = sock->ops->owner;
593 sock->ops->release(sock);
598 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
599 pr_err("%s: fasync list not empty!\n", __func__);
601 if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
604 this_cpu_sub(sockets_in_use, 1);
606 iput(SOCK_INODE(sock));
611 EXPORT_SYMBOL(sock_release);
613 void sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags)
615 u8 flags = *tx_flags;
617 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
618 flags |= SKBTX_HW_TSTAMP;
620 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
621 flags |= SKBTX_SW_TSTAMP;
623 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)
624 flags |= SKBTX_SCHED_TSTAMP;
626 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)
627 flags |= SKBTX_ACK_TSTAMP;
629 if (sock_flag(sk, SOCK_WIFI_STATUS))
630 flags |= SKBTX_WIFI_STATUS;
634 EXPORT_SYMBOL(sock_tx_timestamp);
636 static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
637 struct msghdr *msg, size_t size)
639 struct sock_iocb *si = kiocb_to_siocb(iocb);
646 return sock->ops->sendmsg(iocb, sock, msg, size);
649 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
650 struct msghdr *msg, size_t size)
652 int err = security_socket_sendmsg(sock, msg, size);
654 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
657 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
660 struct sock_iocb siocb;
663 init_sync_kiocb(&iocb, NULL);
664 iocb.private = &siocb;
665 ret = __sock_sendmsg(&iocb, sock, msg, size);
666 if (-EIOCBQUEUED == ret)
667 ret = wait_on_sync_kiocb(&iocb);
670 EXPORT_SYMBOL(sock_sendmsg);
672 static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
675 struct sock_iocb siocb;
678 init_sync_kiocb(&iocb, NULL);
679 iocb.private = &siocb;
680 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
681 if (-EIOCBQUEUED == ret)
682 ret = wait_on_sync_kiocb(&iocb);
686 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
687 struct kvec *vec, size_t num, size_t size)
689 mm_segment_t oldfs = get_fs();
694 * the following is safe, since for compiler definitions of kvec and
695 * iovec are identical, yielding the same in-core layout and alignment
697 msg->msg_iov = (struct iovec *)vec;
698 msg->msg_iovlen = num;
699 result = sock_sendmsg(sock, msg, size);
703 EXPORT_SYMBOL(kernel_sendmsg);
706 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
708 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
711 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
712 struct scm_timestamping tss;
714 struct skb_shared_hwtstamps *shhwtstamps =
717 /* Race occurred between timestamp enabling and packet
718 receiving. Fill in the current time for now. */
719 if (need_software_tstamp && skb->tstamp.tv64 == 0)
720 __net_timestamp(skb);
722 if (need_software_tstamp) {
723 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
725 skb_get_timestamp(skb, &tv);
726 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
730 skb_get_timestampns(skb, &ts);
731 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
736 memset(&tss, 0, sizeof(tss));
737 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE ||
738 skb_shinfo(skb)->tx_flags & SKBTX_ANY_SW_TSTAMP) &&
739 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
742 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
743 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
746 put_cmsg(msg, SOL_SOCKET,
747 SCM_TIMESTAMPING, sizeof(tss), &tss);
749 EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
751 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
756 if (!sock_flag(sk, SOCK_WIFI_STATUS))
758 if (!skb->wifi_acked_valid)
761 ack = skb->wifi_acked;
763 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
765 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
767 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
770 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
771 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
772 sizeof(__u32), &skb->dropcount);
775 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
778 sock_recv_timestamp(msg, sk, skb);
779 sock_recv_drops(msg, sk, skb);
781 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
783 static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
784 struct msghdr *msg, size_t size, int flags)
786 struct sock_iocb *si = kiocb_to_siocb(iocb);
794 return sock->ops->recvmsg(iocb, sock, msg, size, flags);
797 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
798 struct msghdr *msg, size_t size, int flags)
800 int err = security_socket_recvmsg(sock, msg, size, flags);
802 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
805 int sock_recvmsg(struct socket *sock, struct msghdr *msg,
806 size_t size, int flags)
809 struct sock_iocb siocb;
812 init_sync_kiocb(&iocb, NULL);
813 iocb.private = &siocb;
814 ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
815 if (-EIOCBQUEUED == ret)
816 ret = wait_on_sync_kiocb(&iocb);
819 EXPORT_SYMBOL(sock_recvmsg);
821 static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
822 size_t size, int flags)
825 struct sock_iocb siocb;
828 init_sync_kiocb(&iocb, NULL);
829 iocb.private = &siocb;
830 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
831 if (-EIOCBQUEUED == ret)
832 ret = wait_on_sync_kiocb(&iocb);
837 * kernel_recvmsg - Receive a message from a socket (kernel space)
838 * @sock: The socket to receive the message from
839 * @msg: Received message
840 * @vec: Input s/g array for message data
841 * @num: Size of input s/g array
842 * @size: Number of bytes to read
843 * @flags: Message flags (MSG_DONTWAIT, etc...)
845 * On return the msg structure contains the scatter/gather array passed in the
846 * vec argument. The array is modified so that it consists of the unfilled
847 * portion of the original array.
849 * The returned value is the total number of bytes received, or an error.
851 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
852 struct kvec *vec, size_t num, size_t size, int flags)
854 mm_segment_t oldfs = get_fs();
859 * the following is safe, since for compiler definitions of kvec and
860 * iovec are identical, yielding the same in-core layout and alignment
862 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
863 result = sock_recvmsg(sock, msg, size, flags);
867 EXPORT_SYMBOL(kernel_recvmsg);
869 static ssize_t sock_sendpage(struct file *file, struct page *page,
870 int offset, size_t size, loff_t *ppos, int more)
875 sock = file->private_data;
877 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
878 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
881 return kernel_sendpage(sock, page, offset, size, flags);
884 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
885 struct pipe_inode_info *pipe, size_t len,
888 struct socket *sock = file->private_data;
890 if (unlikely(!sock->ops->splice_read))
893 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
896 static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
897 struct sock_iocb *siocb)
899 if (!is_sync_kiocb(iocb))
903 iocb->private = siocb;
907 static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
908 struct file *file, const struct iovec *iov,
909 unsigned long nr_segs)
911 struct socket *sock = file->private_data;
915 for (i = 0; i < nr_segs; i++)
916 size += iov[i].iov_len;
918 msg->msg_name = NULL;
919 msg->msg_namelen = 0;
920 msg->msg_control = NULL;
921 msg->msg_controllen = 0;
922 msg->msg_iov = (struct iovec *)iov;
923 msg->msg_iovlen = nr_segs;
924 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
926 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
929 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
930 unsigned long nr_segs, loff_t pos)
932 struct sock_iocb siocb, *x;
937 if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */
941 x = alloc_sock_iocb(iocb, &siocb);
944 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
947 static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
948 struct file *file, const struct iovec *iov,
949 unsigned long nr_segs)
951 struct socket *sock = file->private_data;
955 for (i = 0; i < nr_segs; i++)
956 size += iov[i].iov_len;
958 msg->msg_name = NULL;
959 msg->msg_namelen = 0;
960 msg->msg_control = NULL;
961 msg->msg_controllen = 0;
962 msg->msg_iov = (struct iovec *)iov;
963 msg->msg_iovlen = nr_segs;
964 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
965 if (sock->type == SOCK_SEQPACKET)
966 msg->msg_flags |= MSG_EOR;
968 return __sock_sendmsg(iocb, sock, msg, size);
971 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
972 unsigned long nr_segs, loff_t pos)
974 struct sock_iocb siocb, *x;
979 x = alloc_sock_iocb(iocb, &siocb);
983 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
987 * Atomic setting of ioctl hooks to avoid race
988 * with module unload.
991 static DEFINE_MUTEX(br_ioctl_mutex);
992 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
994 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
996 mutex_lock(&br_ioctl_mutex);
997 br_ioctl_hook = hook;
998 mutex_unlock(&br_ioctl_mutex);
1000 EXPORT_SYMBOL(brioctl_set);
1002 static DEFINE_MUTEX(vlan_ioctl_mutex);
1003 static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
1005 void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
1007 mutex_lock(&vlan_ioctl_mutex);
1008 vlan_ioctl_hook = hook;
1009 mutex_unlock(&vlan_ioctl_mutex);
1011 EXPORT_SYMBOL(vlan_ioctl_set);
1013 static DEFINE_MUTEX(dlci_ioctl_mutex);
1014 static int (*dlci_ioctl_hook) (unsigned int, void __user *);
1016 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
1018 mutex_lock(&dlci_ioctl_mutex);
1019 dlci_ioctl_hook = hook;
1020 mutex_unlock(&dlci_ioctl_mutex);
1022 EXPORT_SYMBOL(dlci_ioctl_set);
1024 static long sock_do_ioctl(struct net *net, struct socket *sock,
1025 unsigned int cmd, unsigned long arg)
1028 void __user *argp = (void __user *)arg;
1030 err = sock->ops->ioctl(sock, cmd, arg);
1033 * If this ioctl is unknown try to hand it down
1034 * to the NIC driver.
1036 if (err == -ENOIOCTLCMD)
1037 err = dev_ioctl(net, cmd, argp);
1043 * With an ioctl, arg may well be a user mode pointer, but we don't know
1044 * what to do with it - that's up to the protocol still.
1047 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1049 struct socket *sock;
1051 void __user *argp = (void __user *)arg;
1055 sock = file->private_data;
1058 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
1059 err = dev_ioctl(net, cmd, argp);
1061 #ifdef CONFIG_WEXT_CORE
1062 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1063 err = dev_ioctl(net, cmd, argp);
1070 if (get_user(pid, (int __user *)argp))
1072 f_setown(sock->file, pid, 1);
1077 err = put_user(f_getown(sock->file),
1078 (int __user *)argp);
1086 request_module("bridge");
1088 mutex_lock(&br_ioctl_mutex);
1090 err = br_ioctl_hook(net, cmd, argp);
1091 mutex_unlock(&br_ioctl_mutex);
1096 if (!vlan_ioctl_hook)
1097 request_module("8021q");
1099 mutex_lock(&vlan_ioctl_mutex);
1100 if (vlan_ioctl_hook)
1101 err = vlan_ioctl_hook(net, argp);
1102 mutex_unlock(&vlan_ioctl_mutex);
1107 if (!dlci_ioctl_hook)
1108 request_module("dlci");
1110 mutex_lock(&dlci_ioctl_mutex);
1111 if (dlci_ioctl_hook)
1112 err = dlci_ioctl_hook(cmd, argp);
1113 mutex_unlock(&dlci_ioctl_mutex);
1116 err = sock_do_ioctl(net, sock, cmd, arg);
1122 int sock_create_lite(int family, int type, int protocol, struct socket **res)
1125 struct socket *sock = NULL;
1127 err = security_socket_create(family, type, protocol, 1);
1131 sock = sock_alloc();
1138 err = security_socket_post_create(sock, family, type, protocol, 1);
1150 EXPORT_SYMBOL(sock_create_lite);
1152 /* No kernel lock held - perfect */
1153 static unsigned int sock_poll(struct file *file, poll_table *wait)
1155 unsigned int busy_flag = 0;
1156 struct socket *sock;
1159 * We can't return errors to poll, so it's either yes or no.
1161 sock = file->private_data;
1163 if (sk_can_busy_loop(sock->sk)) {
1164 /* this socket can poll_ll so tell the system call */
1165 busy_flag = POLL_BUSY_LOOP;
1167 /* once, only if requested by syscall */
1168 if (wait && (wait->_key & POLL_BUSY_LOOP))
1169 sk_busy_loop(sock->sk, 1);
1172 return busy_flag | sock->ops->poll(file, sock, wait);
1175 static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1177 struct socket *sock = file->private_data;
1179 return sock->ops->mmap(file, sock, vma);
1182 static int sock_close(struct inode *inode, struct file *filp)
1184 sock_release(SOCKET_I(inode));
1189 * Update the socket async list
1191 * Fasync_list locking strategy.
1193 * 1. fasync_list is modified only under process context socket lock
1194 * i.e. under semaphore.
1195 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1196 * or under socket lock
1199 static int sock_fasync(int fd, struct file *filp, int on)
1201 struct socket *sock = filp->private_data;
1202 struct sock *sk = sock->sk;
1203 struct socket_wq *wq;
1209 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1210 fasync_helper(fd, filp, on, &wq->fasync_list);
1212 if (!wq->fasync_list)
1213 sock_reset_flag(sk, SOCK_FASYNC);
1215 sock_set_flag(sk, SOCK_FASYNC);
1221 /* This function may be called only under socket lock or callback_lock or rcu_lock */
1223 int sock_wake_async(struct socket *sock, int how, int band)
1225 struct socket_wq *wq;
1230 wq = rcu_dereference(sock->wq);
1231 if (!wq || !wq->fasync_list) {
1236 case SOCK_WAKE_WAITD:
1237 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1240 case SOCK_WAKE_SPACE:
1241 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1246 kill_fasync(&wq->fasync_list, SIGIO, band);
1249 kill_fasync(&wq->fasync_list, SIGURG, band);
1254 EXPORT_SYMBOL(sock_wake_async);
1256 int __sock_create(struct net *net, int family, int type, int protocol,
1257 struct socket **res, int kern)
1260 struct socket *sock;
1261 const struct net_proto_family *pf;
1264 * Check protocol is in range
1266 if (family < 0 || family >= NPROTO)
1267 return -EAFNOSUPPORT;
1268 if (type < 0 || type >= SOCK_MAX)
1273 This uglymoron is moved from INET layer to here to avoid
1274 deadlock in module load.
1276 if (family == PF_INET && type == SOCK_PACKET) {
1280 pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1286 err = security_socket_create(family, type, protocol, kern);
1291 * Allocate the socket and allow the family to set things up. if
1292 * the protocol is 0, the family is instructed to select an appropriate
1295 sock = sock_alloc();
1297 net_warn_ratelimited("socket: no more sockets\n");
1298 return -ENFILE; /* Not exactly a match, but its the
1299 closest posix thing */
1304 #ifdef CONFIG_MODULES
1305 /* Attempt to load a protocol module if the find failed.
1307 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1308 * requested real, full-featured networking support upon configuration.
1309 * Otherwise module support will break!
1311 if (rcu_access_pointer(net_families[family]) == NULL)
1312 request_module("net-pf-%d", family);
1316 pf = rcu_dereference(net_families[family]);
1317 err = -EAFNOSUPPORT;
1322 * We will call the ->create function, that possibly is in a loadable
1323 * module, so we have to bump that loadable module refcnt first.
1325 if (!try_module_get(pf->owner))
1328 /* Now protected by module ref count */
1331 err = pf->create(net, sock, protocol, kern);
1333 goto out_module_put;
1336 * Now to bump the refcnt of the [loadable] module that owns this
1337 * socket at sock_release time we decrement its refcnt.
1339 if (!try_module_get(sock->ops->owner))
1340 goto out_module_busy;
1343 * Now that we're done with the ->create function, the [loadable]
1344 * module can have its refcnt decremented
1346 module_put(pf->owner);
1347 err = security_socket_post_create(sock, family, type, protocol, kern);
1349 goto out_sock_release;
1355 err = -EAFNOSUPPORT;
1358 module_put(pf->owner);
1365 goto out_sock_release;
1367 EXPORT_SYMBOL(__sock_create);
1369 int sock_create(int family, int type, int protocol, struct socket **res)
1371 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1373 EXPORT_SYMBOL(sock_create);
1375 int sock_create_kern(int family, int type, int protocol, struct socket **res)
1377 return __sock_create(&init_net, family, type, protocol, res, 1);
1379 EXPORT_SYMBOL(sock_create_kern);
1381 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1384 struct socket *sock;
1387 /* Check the SOCK_* constants for consistency. */
1388 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1389 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1390 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1391 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1393 flags = type & ~SOCK_TYPE_MASK;
1394 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1396 type &= SOCK_TYPE_MASK;
1398 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1399 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1401 retval = sock_create(family, type, protocol, &sock);
1405 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
1410 /* It may be already another descriptor 8) Not kernel problem. */
1419 * Create a pair of connected sockets.
1422 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1423 int __user *, usockvec)
1425 struct socket *sock1, *sock2;
1427 struct file *newfile1, *newfile2;
1430 flags = type & ~SOCK_TYPE_MASK;
1431 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1433 type &= SOCK_TYPE_MASK;
1435 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1436 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1439 * Obtain the first socket and check if the underlying protocol
1440 * supports the socketpair call.
1443 err = sock_create(family, type, protocol, &sock1);
1447 err = sock_create(family, type, protocol, &sock2);
1451 err = sock1->ops->socketpair(sock1, sock2);
1453 goto out_release_both;
1455 fd1 = get_unused_fd_flags(flags);
1456 if (unlikely(fd1 < 0)) {
1458 goto out_release_both;
1461 fd2 = get_unused_fd_flags(flags);
1462 if (unlikely(fd2 < 0)) {
1464 goto out_put_unused_1;
1467 newfile1 = sock_alloc_file(sock1, flags, NULL);
1468 if (unlikely(IS_ERR(newfile1))) {
1469 err = PTR_ERR(newfile1);
1470 goto out_put_unused_both;
1473 newfile2 = sock_alloc_file(sock2, flags, NULL);
1474 if (IS_ERR(newfile2)) {
1475 err = PTR_ERR(newfile2);
1479 err = put_user(fd1, &usockvec[0]);
1483 err = put_user(fd2, &usockvec[1]);
1487 audit_fd_pair(fd1, fd2);
1489 fd_install(fd1, newfile1);
1490 fd_install(fd2, newfile2);
1491 /* fd1 and fd2 may be already another descriptors.
1492 * Not kernel problem.
1508 sock_release(sock2);
1511 out_put_unused_both:
1516 sock_release(sock2);
1518 sock_release(sock1);
1524 * Bind a name to a socket. Nothing much to do here since it's
1525 * the protocol's responsibility to handle the local address.
1527 * We move the socket address to kernel space before we call
1528 * the protocol layer (having also checked the address is ok).
1531 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1533 struct socket *sock;
1534 struct sockaddr_storage address;
1535 int err, fput_needed;
1537 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1539 err = move_addr_to_kernel(umyaddr, addrlen, &address);
1541 err = security_socket_bind(sock,
1542 (struct sockaddr *)&address,
1545 err = sock->ops->bind(sock,
1549 fput_light(sock->file, fput_needed);
1555 * Perform a listen. Basically, we allow the protocol to do anything
1556 * necessary for a listen, and if that works, we mark the socket as
1557 * ready for listening.
1560 SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1562 struct socket *sock;
1563 int err, fput_needed;
1566 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1568 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1569 if ((unsigned int)backlog > somaxconn)
1570 backlog = somaxconn;
1572 err = security_socket_listen(sock, backlog);
1574 err = sock->ops->listen(sock, backlog);
1576 fput_light(sock->file, fput_needed);
1582 * For accept, we attempt to create a new socket, set up the link
1583 * with the client, wake up the client, then return the new
1584 * connected fd. We collect the address of the connector in kernel
1585 * space and move it to user at the very end. This is unclean because
1586 * we open the socket then return an error.
1588 * 1003.1g adds the ability to recvmsg() to query connection pending
1589 * status to recvmsg. We need to add that support in a way thats
1590 * clean when we restucture accept also.
1593 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1594 int __user *, upeer_addrlen, int, flags)
1596 struct socket *sock, *newsock;
1597 struct file *newfile;
1598 int err, len, newfd, fput_needed;
1599 struct sockaddr_storage address;
1601 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1604 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1605 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1607 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1612 newsock = sock_alloc();
1616 newsock->type = sock->type;
1617 newsock->ops = sock->ops;
1620 * We don't need try_module_get here, as the listening socket (sock)
1621 * has the protocol module (sock->ops->owner) held.
1623 __module_get(newsock->ops->owner);
1625 newfd = get_unused_fd_flags(flags);
1626 if (unlikely(newfd < 0)) {
1628 sock_release(newsock);
1631 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1632 if (unlikely(IS_ERR(newfile))) {
1633 err = PTR_ERR(newfile);
1634 put_unused_fd(newfd);
1635 sock_release(newsock);
1639 err = security_socket_accept(sock, newsock);
1643 err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1647 if (upeer_sockaddr) {
1648 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1650 err = -ECONNABORTED;
1653 err = move_addr_to_user(&address,
1654 len, upeer_sockaddr, upeer_addrlen);
1659 /* File flags are not inherited via accept() unlike another OSes. */
1661 fd_install(newfd, newfile);
1665 fput_light(sock->file, fput_needed);
1670 put_unused_fd(newfd);
1674 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1675 int __user *, upeer_addrlen)
1677 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1681 * Attempt to connect to a socket with the server address. The address
1682 * is in user space so we verify it is OK and move it to kernel space.
1684 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1687 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1688 * other SEQPACKET protocols that take time to connect() as it doesn't
1689 * include the -EINPROGRESS status for such sockets.
1692 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1695 struct socket *sock;
1696 struct sockaddr_storage address;
1697 int err, fput_needed;
1699 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1702 err = move_addr_to_kernel(uservaddr, addrlen, &address);
1707 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1711 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1712 sock->file->f_flags);
1714 fput_light(sock->file, fput_needed);
1720 * Get the local address ('name') of a socket object. Move the obtained
1721 * name to user space.
1724 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1725 int __user *, usockaddr_len)
1727 struct socket *sock;
1728 struct sockaddr_storage address;
1729 int len, err, fput_needed;
1731 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1735 err = security_socket_getsockname(sock);
1739 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1742 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
1745 fput_light(sock->file, fput_needed);
1751 * Get the remote address ('name') of a socket object. Move the obtained
1752 * name to user space.
1755 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1756 int __user *, usockaddr_len)
1758 struct socket *sock;
1759 struct sockaddr_storage address;
1760 int len, err, fput_needed;
1762 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1764 err = security_socket_getpeername(sock);
1766 fput_light(sock->file, fput_needed);
1771 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1774 err = move_addr_to_user(&address, len, usockaddr,
1776 fput_light(sock->file, fput_needed);
1782 * Send a datagram to a given address. We move the address into kernel
1783 * space and check the user space data area is readable before invoking
1787 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1788 unsigned int, flags, struct sockaddr __user *, addr,
1791 struct socket *sock;
1792 struct sockaddr_storage address;
1800 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1804 iov.iov_base = buff;
1806 msg.msg_name = NULL;
1809 msg.msg_control = NULL;
1810 msg.msg_controllen = 0;
1811 msg.msg_namelen = 0;
1813 err = move_addr_to_kernel(addr, addr_len, &address);
1816 msg.msg_name = (struct sockaddr *)&address;
1817 msg.msg_namelen = addr_len;
1819 if (sock->file->f_flags & O_NONBLOCK)
1820 flags |= MSG_DONTWAIT;
1821 msg.msg_flags = flags;
1822 err = sock_sendmsg(sock, &msg, len);
1825 fput_light(sock->file, fput_needed);
1831 * Send a datagram down a socket.
1834 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1835 unsigned int, flags)
1837 return sys_sendto(fd, buff, len, flags, NULL, 0);
1841 * Receive a frame from the socket and optionally record the address of the
1842 * sender. We verify the buffers are writable and if needed move the
1843 * sender address from kernel to user space.
1846 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1847 unsigned int, flags, struct sockaddr __user *, addr,
1848 int __user *, addr_len)
1850 struct socket *sock;
1853 struct sockaddr_storage address;
1859 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1863 msg.msg_control = NULL;
1864 msg.msg_controllen = 0;
1868 iov.iov_base = ubuf;
1869 /* Save some cycles and don't copy the address if not needed */
1870 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1871 /* We assume all kernel code knows the size of sockaddr_storage */
1872 msg.msg_namelen = 0;
1873 if (sock->file->f_flags & O_NONBLOCK)
1874 flags |= MSG_DONTWAIT;
1875 err = sock_recvmsg(sock, &msg, size, flags);
1877 if (err >= 0 && addr != NULL) {
1878 err2 = move_addr_to_user(&address,
1879 msg.msg_namelen, addr, addr_len);
1884 fput_light(sock->file, fput_needed);
1890 * Receive a datagram from a socket.
1893 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1894 unsigned int, flags)
1896 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1900 * Set a socket option. Because we don't know the option lengths we have
1901 * to pass the user mode parameter for the protocols to sort out.
1904 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1905 char __user *, optval, int, optlen)
1907 int err, fput_needed;
1908 struct socket *sock;
1913 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1915 err = security_socket_setsockopt(sock, level, optname);
1919 if (level == SOL_SOCKET)
1921 sock_setsockopt(sock, level, optname, optval,
1925 sock->ops->setsockopt(sock, level, optname, optval,
1928 fput_light(sock->file, fput_needed);
1934 * Get a socket option. Because we don't know the option lengths we have
1935 * to pass a user mode parameter for the protocols to sort out.
1938 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1939 char __user *, optval, int __user *, optlen)
1941 int err, fput_needed;
1942 struct socket *sock;
1944 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1946 err = security_socket_getsockopt(sock, level, optname);
1950 if (level == SOL_SOCKET)
1952 sock_getsockopt(sock, level, optname, optval,
1956 sock->ops->getsockopt(sock, level, optname, optval,
1959 fput_light(sock->file, fput_needed);
1965 * Shutdown a socket.
1968 SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1970 int err, fput_needed;
1971 struct socket *sock;
1973 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1975 err = security_socket_shutdown(sock, how);
1977 err = sock->ops->shutdown(sock, how);
1978 fput_light(sock->file, fput_needed);
1983 /* A couple of helpful macros for getting the address of the 32/64 bit
1984 * fields which are the same type (int / unsigned) on our platforms.
1986 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1987 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1988 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1990 struct used_address {
1991 struct sockaddr_storage name;
1992 unsigned int name_len;
1995 static int copy_msghdr_from_user(struct msghdr *kmsg,
1996 struct msghdr __user *umsg)
1998 if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
2001 if (kmsg->msg_namelen < 0)
2004 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
2005 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
2009 static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
2010 struct msghdr *msg_sys, unsigned int flags,
2011 struct used_address *used_address)
2013 struct compat_msghdr __user *msg_compat =
2014 (struct compat_msghdr __user *)msg;
2015 struct sockaddr_storage address;
2016 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
2017 unsigned char ctl[sizeof(struct cmsghdr) + 20]
2018 __attribute__ ((aligned(sizeof(__kernel_size_t))));
2019 /* 20 is size of ipv6_pktinfo */
2020 unsigned char *ctl_buf = ctl;
2021 int err, ctl_len, total_len;
2024 if (MSG_CMSG_COMPAT & flags) {
2025 if (get_compat_msghdr(msg_sys, msg_compat))
2028 err = copy_msghdr_from_user(msg_sys, msg);
2033 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2035 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2038 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2044 /* This will also move the address data into kernel space */
2045 if (MSG_CMSG_COMPAT & flags) {
2046 err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
2048 err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
2055 if (msg_sys->msg_controllen > INT_MAX)
2057 ctl_len = msg_sys->msg_controllen;
2058 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
2060 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
2064 ctl_buf = msg_sys->msg_control;
2065 ctl_len = msg_sys->msg_controllen;
2066 } else if (ctl_len) {
2067 if (ctl_len > sizeof(ctl)) {
2068 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
2069 if (ctl_buf == NULL)
2074 * Careful! Before this, msg_sys->msg_control contains a user pointer.
2075 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2076 * checking falls down on this.
2078 if (copy_from_user(ctl_buf,
2079 (void __user __force *)msg_sys->msg_control,
2082 msg_sys->msg_control = ctl_buf;
2084 msg_sys->msg_flags = flags;
2086 if (sock->file->f_flags & O_NONBLOCK)
2087 msg_sys->msg_flags |= MSG_DONTWAIT;
2089 * If this is sendmmsg() and current destination address is same as
2090 * previously succeeded address, omit asking LSM's decision.
2091 * used_address->name_len is initialized to UINT_MAX so that the first
2092 * destination address never matches.
2094 if (used_address && msg_sys->msg_name &&
2095 used_address->name_len == msg_sys->msg_namelen &&
2096 !memcmp(&used_address->name, msg_sys->msg_name,
2097 used_address->name_len)) {
2098 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
2101 err = sock_sendmsg(sock, msg_sys, total_len);
2103 * If this is sendmmsg() and sending to current destination address was
2104 * successful, remember it.
2106 if (used_address && err >= 0) {
2107 used_address->name_len = msg_sys->msg_namelen;
2108 if (msg_sys->msg_name)
2109 memcpy(&used_address->name, msg_sys->msg_name,
2110 used_address->name_len);
2115 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2117 if (iov != iovstack)
2124 * BSD sendmsg interface
2127 long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
2129 int fput_needed, err;
2130 struct msghdr msg_sys;
2131 struct socket *sock;
2133 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2137 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2139 fput_light(sock->file, fput_needed);
2144 SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
2146 if (flags & MSG_CMSG_COMPAT)
2148 return __sys_sendmsg(fd, msg, flags);
2152 * Linux sendmmsg interface
2155 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2158 int fput_needed, err, datagrams;
2159 struct socket *sock;
2160 struct mmsghdr __user *entry;
2161 struct compat_mmsghdr __user *compat_entry;
2162 struct msghdr msg_sys;
2163 struct used_address used_address;
2165 if (vlen > UIO_MAXIOV)
2170 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2174 used_address.name_len = UINT_MAX;
2176 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2179 while (datagrams < vlen) {
2180 if (MSG_CMSG_COMPAT & flags) {
2181 err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2182 &msg_sys, flags, &used_address);
2185 err = __put_user(err, &compat_entry->msg_len);
2188 err = ___sys_sendmsg(sock,
2189 (struct msghdr __user *)entry,
2190 &msg_sys, flags, &used_address);
2193 err = put_user(err, &entry->msg_len);
2202 fput_light(sock->file, fput_needed);
2204 /* We only return an error if no datagrams were able to be sent */
2211 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2212 unsigned int, vlen, unsigned int, flags)
2214 if (flags & MSG_CMSG_COMPAT)
2216 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2219 static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2220 struct msghdr *msg_sys, unsigned int flags, int nosec)
2222 struct compat_msghdr __user *msg_compat =
2223 (struct compat_msghdr __user *)msg;
2224 struct iovec iovstack[UIO_FASTIOV];
2225 struct iovec *iov = iovstack;
2226 unsigned long cmsg_ptr;
2227 int err, total_len, len;
2229 /* kernel mode address */
2230 struct sockaddr_storage addr;
2232 /* user mode address pointers */
2233 struct sockaddr __user *uaddr;
2234 int __user *uaddr_len;
2236 if (MSG_CMSG_COMPAT & flags) {
2237 if (get_compat_msghdr(msg_sys, msg_compat))
2240 err = copy_msghdr_from_user(msg_sys, msg);
2245 if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2247 if (msg_sys->msg_iovlen > UIO_MAXIOV)
2250 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2256 /* Save the user-mode address (verify_iovec will change the
2257 * kernel msghdr to use the kernel address space)
2259 uaddr = (__force void __user *)msg_sys->msg_name;
2260 uaddr_len = COMPAT_NAMELEN(msg);
2261 if (MSG_CMSG_COMPAT & flags)
2262 err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
2264 err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
2269 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2270 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2272 /* We assume all kernel code knows the size of sockaddr_storage */
2273 msg_sys->msg_namelen = 0;
2275 if (sock->file->f_flags & O_NONBLOCK)
2276 flags |= MSG_DONTWAIT;
2277 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2283 if (uaddr != NULL) {
2284 err = move_addr_to_user(&addr,
2285 msg_sys->msg_namelen, uaddr,
2290 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2294 if (MSG_CMSG_COMPAT & flags)
2295 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2296 &msg_compat->msg_controllen);
2298 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2299 &msg->msg_controllen);
2305 if (iov != iovstack)
2312 * BSD recvmsg interface
2315 long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
2317 int fput_needed, err;
2318 struct msghdr msg_sys;
2319 struct socket *sock;
2321 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2325 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2327 fput_light(sock->file, fput_needed);
2332 SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2333 unsigned int, flags)
2335 if (flags & MSG_CMSG_COMPAT)
2337 return __sys_recvmsg(fd, msg, flags);
2341 * Linux recvmmsg interface
2344 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2345 unsigned int flags, struct timespec *timeout)
2347 int fput_needed, err, datagrams;
2348 struct socket *sock;
2349 struct mmsghdr __user *entry;
2350 struct compat_mmsghdr __user *compat_entry;
2351 struct msghdr msg_sys;
2352 struct timespec end_time;
2355 poll_select_set_timeout(&end_time, timeout->tv_sec,
2361 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2365 err = sock_error(sock->sk);
2370 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2372 while (datagrams < vlen) {
2374 * No need to ask LSM for more than the first datagram.
2376 if (MSG_CMSG_COMPAT & flags) {
2377 err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2378 &msg_sys, flags & ~MSG_WAITFORONE,
2382 err = __put_user(err, &compat_entry->msg_len);
2385 err = ___sys_recvmsg(sock,
2386 (struct msghdr __user *)entry,
2387 &msg_sys, flags & ~MSG_WAITFORONE,
2391 err = put_user(err, &entry->msg_len);
2399 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2400 if (flags & MSG_WAITFORONE)
2401 flags |= MSG_DONTWAIT;
2404 ktime_get_ts(timeout);
2405 *timeout = timespec_sub(end_time, *timeout);
2406 if (timeout->tv_sec < 0) {
2407 timeout->tv_sec = timeout->tv_nsec = 0;
2411 /* Timeout, return less than vlen datagrams */
2412 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2416 /* Out of band data, return right away */
2417 if (msg_sys.msg_flags & MSG_OOB)
2422 fput_light(sock->file, fput_needed);
2427 if (datagrams != 0) {
2429 * We may return less entries than requested (vlen) if the
2430 * sock is non block and there aren't enough datagrams...
2432 if (err != -EAGAIN) {
2434 * ... or if recvmsg returns an error after we
2435 * received some datagrams, where we record the
2436 * error to return on the next call or if the
2437 * app asks about it using getsockopt(SO_ERROR).
2439 sock->sk->sk_err = -err;
2448 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2449 unsigned int, vlen, unsigned int, flags,
2450 struct timespec __user *, timeout)
2453 struct timespec timeout_sys;
2455 if (flags & MSG_CMSG_COMPAT)
2459 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2461 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2464 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2466 if (datagrams > 0 &&
2467 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2468 datagrams = -EFAULT;
2473 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2474 /* Argument list sizes for sys_socketcall */
2475 #define AL(x) ((x) * sizeof(unsigned long))
2476 static const unsigned char nargs[21] = {
2477 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2478 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2479 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2486 * System call vectors.
2488 * Argument checking cleaned up. Saved 20% in size.
2489 * This function doesn't need to set the kernel lock because
2490 * it is set by the callees.
2493 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2495 unsigned long a[AUDITSC_ARGS];
2496 unsigned long a0, a1;
2500 if (call < 1 || call > SYS_SENDMMSG)
2504 if (len > sizeof(a))
2507 /* copy_from_user should be SMP safe. */
2508 if (copy_from_user(a, args, len))
2511 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2520 err = sys_socket(a0, a1, a[2]);
2523 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2526 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2529 err = sys_listen(a0, a1);
2532 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2533 (int __user *)a[2], 0);
2535 case SYS_GETSOCKNAME:
2537 sys_getsockname(a0, (struct sockaddr __user *)a1,
2538 (int __user *)a[2]);
2540 case SYS_GETPEERNAME:
2542 sys_getpeername(a0, (struct sockaddr __user *)a1,
2543 (int __user *)a[2]);
2545 case SYS_SOCKETPAIR:
2546 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2549 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2552 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2553 (struct sockaddr __user *)a[4], a[5]);
2556 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2559 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2560 (struct sockaddr __user *)a[4],
2561 (int __user *)a[5]);
2564 err = sys_shutdown(a0, a1);
2566 case SYS_SETSOCKOPT:
2567 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2569 case SYS_GETSOCKOPT:
2571 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2572 (int __user *)a[4]);
2575 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2578 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2581 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2584 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2585 (struct timespec __user *)a[4]);
2588 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2589 (int __user *)a[2], a[3]);
2598 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
2601 * sock_register - add a socket protocol handler
2602 * @ops: description of protocol
2604 * This function is called by a protocol handler that wants to
2605 * advertise its address family, and have it linked into the
2606 * socket interface. The value ops->family coresponds to the
2607 * socket system call protocol family.
2609 int sock_register(const struct net_proto_family *ops)
2613 if (ops->family >= NPROTO) {
2614 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
2618 spin_lock(&net_family_lock);
2619 if (rcu_dereference_protected(net_families[ops->family],
2620 lockdep_is_held(&net_family_lock)))
2623 rcu_assign_pointer(net_families[ops->family], ops);
2626 spin_unlock(&net_family_lock);
2628 pr_info("NET: Registered protocol family %d\n", ops->family);
2631 EXPORT_SYMBOL(sock_register);
2634 * sock_unregister - remove a protocol handler
2635 * @family: protocol family to remove
2637 * This function is called by a protocol handler that wants to
2638 * remove its address family, and have it unlinked from the
2639 * new socket creation.
2641 * If protocol handler is a module, then it can use module reference
2642 * counts to protect against new references. If protocol handler is not
2643 * a module then it needs to provide its own protection in
2644 * the ops->create routine.
2646 void sock_unregister(int family)
2648 BUG_ON(family < 0 || family >= NPROTO);
2650 spin_lock(&net_family_lock);
2651 RCU_INIT_POINTER(net_families[family], NULL);
2652 spin_unlock(&net_family_lock);
2656 pr_info("NET: Unregistered protocol family %d\n", family);
2658 EXPORT_SYMBOL(sock_unregister);
2660 static int __init sock_init(void)
2664 * Initialize the network sysctl infrastructure.
2666 err = net_sysctl_init();
2671 * Initialize skbuff SLAB cache
2676 * Initialize the protocols module.
2681 err = register_filesystem(&sock_fs_type);
2684 sock_mnt = kern_mount(&sock_fs_type);
2685 if (IS_ERR(sock_mnt)) {
2686 err = PTR_ERR(sock_mnt);
2690 /* The real protocol initialization is performed in later initcalls.
2693 #ifdef CONFIG_NETFILTER
2694 err = netfilter_init();
2699 ptp_classifier_init();
2705 unregister_filesystem(&sock_fs_type);
2710 core_initcall(sock_init); /* early initcall */
2712 #ifdef CONFIG_PROC_FS
2713 void socket_seq_show(struct seq_file *seq)
2718 for_each_possible_cpu(cpu)
2719 counter += per_cpu(sockets_in_use, cpu);
2721 /* It can be negative, by the way. 8) */
2725 seq_printf(seq, "sockets: used %d\n", counter);
2727 #endif /* CONFIG_PROC_FS */
2729 #ifdef CONFIG_COMPAT
2730 static int do_siocgstamp(struct net *net, struct socket *sock,
2731 unsigned int cmd, void __user *up)
2733 mm_segment_t old_fs = get_fs();
2738 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2741 err = compat_put_timeval(&ktv, up);
2746 static int do_siocgstampns(struct net *net, struct socket *sock,
2747 unsigned int cmd, void __user *up)
2749 mm_segment_t old_fs = get_fs();
2750 struct timespec kts;
2754 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2757 err = compat_put_timespec(&kts, up);
2762 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2764 struct ifreq __user *uifr;
2767 uifr = compat_alloc_user_space(sizeof(struct ifreq));
2768 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2771 err = dev_ioctl(net, SIOCGIFNAME, uifr);
2775 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2781 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2783 struct compat_ifconf ifc32;
2785 struct ifconf __user *uifc;
2786 struct compat_ifreq __user *ifr32;
2787 struct ifreq __user *ifr;
2791 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2794 memset(&ifc, 0, sizeof(ifc));
2795 if (ifc32.ifcbuf == 0) {
2799 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2801 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2802 sizeof(struct ifreq);
2803 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2805 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2806 ifr32 = compat_ptr(ifc32.ifcbuf);
2807 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2808 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2814 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2817 err = dev_ioctl(net, SIOCGIFCONF, uifc);
2821 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2825 ifr32 = compat_ptr(ifc32.ifcbuf);
2827 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2828 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2829 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2835 if (ifc32.ifcbuf == 0) {
2836 /* Translate from 64-bit structure multiple to
2840 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2845 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2851 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2853 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2854 bool convert_in = false, convert_out = false;
2855 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2856 struct ethtool_rxnfc __user *rxnfc;
2857 struct ifreq __user *ifr;
2858 u32 rule_cnt = 0, actual_rule_cnt;
2863 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2866 compat_rxnfc = compat_ptr(data);
2868 if (get_user(ethcmd, &compat_rxnfc->cmd))
2871 /* Most ethtool structures are defined without padding.
2872 * Unfortunately struct ethtool_rxnfc is an exception.
2877 case ETHTOOL_GRXCLSRLALL:
2878 /* Buffer size is variable */
2879 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2881 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2883 buf_size += rule_cnt * sizeof(u32);
2885 case ETHTOOL_GRXRINGS:
2886 case ETHTOOL_GRXCLSRLCNT:
2887 case ETHTOOL_GRXCLSRULE:
2888 case ETHTOOL_SRXCLSRLINS:
2891 case ETHTOOL_SRXCLSRLDEL:
2892 buf_size += sizeof(struct ethtool_rxnfc);
2897 ifr = compat_alloc_user_space(buf_size);
2898 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
2900 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2903 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2904 &ifr->ifr_ifru.ifru_data))
2908 /* We expect there to be holes between fs.m_ext and
2909 * fs.ring_cookie and at the end of fs, but nowhere else.
2911 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2912 sizeof(compat_rxnfc->fs.m_ext) !=
2913 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2914 sizeof(rxnfc->fs.m_ext));
2916 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2917 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2918 offsetof(struct ethtool_rxnfc, fs.location) -
2919 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2921 if (copy_in_user(rxnfc, compat_rxnfc,
2922 (void __user *)(&rxnfc->fs.m_ext + 1) -
2923 (void __user *)rxnfc) ||
2924 copy_in_user(&rxnfc->fs.ring_cookie,
2925 &compat_rxnfc->fs.ring_cookie,
2926 (void __user *)(&rxnfc->fs.location + 1) -
2927 (void __user *)&rxnfc->fs.ring_cookie) ||
2928 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2929 sizeof(rxnfc->rule_cnt)))
2933 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2938 if (copy_in_user(compat_rxnfc, rxnfc,
2939 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2940 (const void __user *)rxnfc) ||
2941 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2942 &rxnfc->fs.ring_cookie,
2943 (const void __user *)(&rxnfc->fs.location + 1) -
2944 (const void __user *)&rxnfc->fs.ring_cookie) ||
2945 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2946 sizeof(rxnfc->rule_cnt)))
2949 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2950 /* As an optimisation, we only copy the actual
2951 * number of rules that the underlying
2952 * function returned. Since Mallory might
2953 * change the rule count in user memory, we
2954 * check that it is less than the rule count
2955 * originally given (as the user buffer size),
2956 * which has been range-checked.
2958 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2960 if (actual_rule_cnt < rule_cnt)
2961 rule_cnt = actual_rule_cnt;
2962 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2963 &rxnfc->rule_locs[0],
2964 rule_cnt * sizeof(u32)))
2972 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2975 compat_uptr_t uptr32;
2976 struct ifreq __user *uifr;
2978 uifr = compat_alloc_user_space(sizeof(*uifr));
2979 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2982 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2985 uptr = compat_ptr(uptr32);
2987 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2990 return dev_ioctl(net, SIOCWANDEV, uifr);
2993 static int bond_ioctl(struct net *net, unsigned int cmd,
2994 struct compat_ifreq __user *ifr32)
2997 mm_segment_t old_fs;
3001 case SIOCBONDENSLAVE:
3002 case SIOCBONDRELEASE:
3003 case SIOCBONDSETHWADDR:
3004 case SIOCBONDCHANGEACTIVE:
3005 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
3010 err = dev_ioctl(net, cmd,
3011 (struct ifreq __user __force *) &kifr);
3016 return -ENOIOCTLCMD;
3020 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
3021 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
3022 struct compat_ifreq __user *u_ifreq32)
3024 struct ifreq __user *u_ifreq64;
3025 char tmp_buf[IFNAMSIZ];
3026 void __user *data64;
3029 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
3032 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
3034 data64 = compat_ptr(data32);
3036 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
3038 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
3041 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
3044 return dev_ioctl(net, cmd, u_ifreq64);
3047 static int dev_ifsioc(struct net *net, struct socket *sock,
3048 unsigned int cmd, struct compat_ifreq __user *uifr32)
3050 struct ifreq __user *uifr;
3053 uifr = compat_alloc_user_space(sizeof(*uifr));
3054 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3057 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3068 case SIOCGIFBRDADDR:
3069 case SIOCGIFDSTADDR:
3070 case SIOCGIFNETMASK:
3075 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3083 static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3084 struct compat_ifreq __user *uifr32)
3087 struct compat_ifmap __user *uifmap32;
3088 mm_segment_t old_fs;
3091 uifmap32 = &uifr32->ifr_ifru.ifru_map;
3092 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
3093 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3094 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3095 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3096 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
3097 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
3098 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
3104 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
3107 if (cmd == SIOCGIFMAP && !err) {
3108 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
3109 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3110 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3111 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3112 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
3113 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
3114 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
3123 struct sockaddr rt_dst; /* target address */
3124 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
3125 struct sockaddr rt_genmask; /* target network mask (IP) */
3126 unsigned short rt_flags;
3129 unsigned char rt_tos;
3130 unsigned char rt_class;
3132 short rt_metric; /* +1 for binary compatibility! */
3133 /* char * */ u32 rt_dev; /* forcing the device at add */
3134 u32 rt_mtu; /* per route MTU/Window */
3135 u32 rt_window; /* Window clamping */
3136 unsigned short rt_irtt; /* Initial RTT */
3139 struct in6_rtmsg32 {
3140 struct in6_addr rtmsg_dst;
3141 struct in6_addr rtmsg_src;
3142 struct in6_addr rtmsg_gateway;
3152 static int routing_ioctl(struct net *net, struct socket *sock,
3153 unsigned int cmd, void __user *argp)
3157 struct in6_rtmsg r6;
3161 mm_segment_t old_fs = get_fs();
3163 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3164 struct in6_rtmsg32 __user *ur6 = argp;
3165 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3166 3 * sizeof(struct in6_addr));
3167 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3168 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3169 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3170 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3171 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3172 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3173 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3177 struct rtentry32 __user *ur4 = argp;
3178 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3179 3 * sizeof(struct sockaddr));
3180 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3181 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3182 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3183 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3184 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3185 ret |= get_user(rtdev, &(ur4->rt_dev));
3187 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3188 r4.rt_dev = (char __user __force *)devname;
3202 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3209 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3210 * for some operations; this forces use of the newer bridge-utils that
3211 * use compatible ioctls
3213 static int old_bridge_ioctl(compat_ulong_t __user *argp)
3217 if (get_user(tmp, argp))
3219 if (tmp == BRCTL_GET_VERSION)
3220 return BRCTL_VERSION + 1;
3224 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3225 unsigned int cmd, unsigned long arg)
3227 void __user *argp = compat_ptr(arg);
3228 struct sock *sk = sock->sk;
3229 struct net *net = sock_net(sk);
3231 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3232 return compat_ifr_data_ioctl(net, cmd, argp);
3237 return old_bridge_ioctl(argp);
3239 return dev_ifname32(net, argp);
3241 return dev_ifconf(net, argp);
3243 return ethtool_ioctl(net, argp);
3245 return compat_siocwandev(net, argp);
3248 return compat_sioc_ifmap(net, cmd, argp);
3249 case SIOCBONDENSLAVE:
3250 case SIOCBONDRELEASE:
3251 case SIOCBONDSETHWADDR:
3252 case SIOCBONDCHANGEACTIVE:
3253 return bond_ioctl(net, cmd, argp);
3256 return routing_ioctl(net, sock, cmd, argp);
3258 return do_siocgstamp(net, sock, cmd, argp);
3260 return do_siocgstampns(net, sock, cmd, argp);
3261 case SIOCBONDSLAVEINFOQUERY:
3262 case SIOCBONDINFOQUERY:
3265 return compat_ifr_data_ioctl(net, cmd, argp);
3277 return sock_ioctl(file, cmd, arg);
3294 case SIOCSIFHWBROADCAST:
3296 case SIOCGIFBRDADDR:
3297 case SIOCSIFBRDADDR:
3298 case SIOCGIFDSTADDR:
3299 case SIOCSIFDSTADDR:
3300 case SIOCGIFNETMASK:
3301 case SIOCSIFNETMASK:
3312 return dev_ifsioc(net, sock, cmd, argp);
3318 return sock_do_ioctl(net, sock, cmd, arg);
3321 return -ENOIOCTLCMD;
3324 static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3327 struct socket *sock = file->private_data;
3328 int ret = -ENOIOCTLCMD;
3335 if (sock->ops->compat_ioctl)
3336 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3338 if (ret == -ENOIOCTLCMD &&
3339 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3340 ret = compat_wext_handle_ioctl(net, cmd, arg);
3342 if (ret == -ENOIOCTLCMD)
3343 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3349 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3351 return sock->ops->bind(sock, addr, addrlen);
3353 EXPORT_SYMBOL(kernel_bind);
3355 int kernel_listen(struct socket *sock, int backlog)
3357 return sock->ops->listen(sock, backlog);
3359 EXPORT_SYMBOL(kernel_listen);
3361 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3363 struct sock *sk = sock->sk;
3366 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3371 err = sock->ops->accept(sock, *newsock, flags);
3373 sock_release(*newsock);
3378 (*newsock)->ops = sock->ops;
3379 __module_get((*newsock)->ops->owner);
3384 EXPORT_SYMBOL(kernel_accept);
3386 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3389 return sock->ops->connect(sock, addr, addrlen, flags);
3391 EXPORT_SYMBOL(kernel_connect);
3393 int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3396 return sock->ops->getname(sock, addr, addrlen, 0);
3398 EXPORT_SYMBOL(kernel_getsockname);
3400 int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3403 return sock->ops->getname(sock, addr, addrlen, 1);
3405 EXPORT_SYMBOL(kernel_getpeername);
3407 int kernel_getsockopt(struct socket *sock, int level, int optname,
3408 char *optval, int *optlen)
3410 mm_segment_t oldfs = get_fs();
3411 char __user *uoptval;
3412 int __user *uoptlen;
3415 uoptval = (char __user __force *) optval;
3416 uoptlen = (int __user __force *) optlen;
3419 if (level == SOL_SOCKET)
3420 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3422 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3427 EXPORT_SYMBOL(kernel_getsockopt);
3429 int kernel_setsockopt(struct socket *sock, int level, int optname,
3430 char *optval, unsigned int optlen)
3432 mm_segment_t oldfs = get_fs();
3433 char __user *uoptval;
3436 uoptval = (char __user __force *) optval;
3439 if (level == SOL_SOCKET)
3440 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3442 err = sock->ops->setsockopt(sock, level, optname, uoptval,
3447 EXPORT_SYMBOL(kernel_setsockopt);
3449 int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3450 size_t size, int flags)
3452 if (sock->ops->sendpage)
3453 return sock->ops->sendpage(sock, page, offset, size, flags);
3455 return sock_no_sendpage(sock, page, offset, size, flags);
3457 EXPORT_SYMBOL(kernel_sendpage);
3459 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3461 mm_segment_t oldfs = get_fs();
3465 err = sock->ops->ioctl(sock, cmd, arg);
3470 EXPORT_SYMBOL(kernel_sock_ioctl);
3472 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3474 return sock->ops->shutdown(sock, how);
3476 EXPORT_SYMBOL(kernel_sock_shutdown);