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 <linux/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_iter = sock_read_iter,
144 .write_iter = sock_write_iter,
146 .unlocked_ioctl = sock_ioctl,
148 .compat_ioctl = compat_sock_ioctl,
151 .release = sock_close,
152 .fasync = sock_fasync,
153 .sendpage = sock_sendpage,
154 .splice_write = generic_splice_sendpage,
155 .splice_read = sock_splice_read,
159 * The protocol list. Each protocol is registered in here.
162 static DEFINE_SPINLOCK(net_family_lock);
163 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
166 * Statistics counters of the socket lists
169 static DEFINE_PER_CPU(int, sockets_in_use);
173 * Move socket addresses back and forth across the kernel/user
174 * divide and look after the messy bits.
178 * move_addr_to_kernel - copy a socket address into kernel space
179 * @uaddr: Address in user space
180 * @kaddr: Address in kernel space
181 * @ulen: Length in user space
183 * The address is copied into kernel space. If the provided address is
184 * too long an error code of -EINVAL is returned. If the copy gives
185 * invalid addresses -EFAULT is returned. On a success 0 is returned.
188 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
190 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
194 if (copy_from_user(kaddr, uaddr, ulen))
196 return audit_sockaddr(ulen, kaddr);
200 * move_addr_to_user - copy an address to user space
201 * @kaddr: kernel space address
202 * @klen: length of address in kernel
203 * @uaddr: user space address
204 * @ulen: pointer to user length field
206 * The value pointed to by ulen on entry is the buffer length available.
207 * This is overwritten with the buffer space used. -EINVAL is returned
208 * if an overlong buffer is specified or a negative buffer size. -EFAULT
209 * is returned if either the buffer or the length field are not
211 * After copying the data up to the limit the user specifies, the true
212 * length of the data is written over the length limit the user
213 * specified. Zero is returned for a success.
216 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
217 void __user *uaddr, int __user *ulen)
222 BUG_ON(klen > sizeof(struct sockaddr_storage));
223 err = get_user(len, ulen);
231 if (audit_sockaddr(klen, kaddr))
233 if (copy_to_user(uaddr, kaddr, len))
237 * "fromlen shall refer to the value before truncation.."
240 return __put_user(klen, ulen);
243 static struct kmem_cache *sock_inode_cachep __read_mostly;
245 static struct inode *sock_alloc_inode(struct super_block *sb)
247 struct socket_alloc *ei;
248 struct socket_wq *wq;
250 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
253 wq = kmalloc(sizeof(*wq), GFP_KERNEL);
255 kmem_cache_free(sock_inode_cachep, ei);
258 init_waitqueue_head(&wq->wait);
259 wq->fasync_list = NULL;
261 RCU_INIT_POINTER(ei->socket.wq, wq);
263 ei->socket.state = SS_UNCONNECTED;
264 ei->socket.flags = 0;
265 ei->socket.ops = NULL;
266 ei->socket.sk = NULL;
267 ei->socket.file = NULL;
269 return &ei->vfs_inode;
272 static void sock_destroy_inode(struct inode *inode)
274 struct socket_alloc *ei;
275 struct socket_wq *wq;
277 ei = container_of(inode, struct socket_alloc, vfs_inode);
278 wq = rcu_dereference_protected(ei->socket.wq, 1);
280 kmem_cache_free(sock_inode_cachep, ei);
283 static void init_once(void *foo)
285 struct socket_alloc *ei = (struct socket_alloc *)foo;
287 inode_init_once(&ei->vfs_inode);
290 static void init_inodecache(void)
292 sock_inode_cachep = kmem_cache_create("sock_inode_cache",
293 sizeof(struct socket_alloc),
295 (SLAB_HWCACHE_ALIGN |
296 SLAB_RECLAIM_ACCOUNT |
297 SLAB_MEM_SPREAD | SLAB_ACCOUNT),
299 BUG_ON(sock_inode_cachep == NULL);
302 static const struct super_operations sockfs_ops = {
303 .alloc_inode = sock_alloc_inode,
304 .destroy_inode = sock_destroy_inode,
305 .statfs = simple_statfs,
309 * sockfs_dname() is called from d_path().
311 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
313 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
314 d_inode(dentry)->i_ino);
317 static const struct dentry_operations sockfs_dentry_operations = {
318 .d_dname = sockfs_dname,
321 static int sockfs_xattr_get(const struct xattr_handler *handler,
322 struct dentry *dentry, struct inode *inode,
323 const char *suffix, void *value, size_t size)
326 if (dentry->d_name.len + 1 > size)
328 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1);
330 return dentry->d_name.len + 1;
333 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
334 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
335 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
337 static const struct xattr_handler sockfs_xattr_handler = {
338 .name = XATTR_NAME_SOCKPROTONAME,
339 .get = sockfs_xattr_get,
342 static int sockfs_security_xattr_set(const struct xattr_handler *handler,
343 struct dentry *dentry, struct inode *inode,
344 const char *suffix, const void *value,
345 size_t size, int flags)
347 /* Handled by LSM. */
351 static const struct xattr_handler sockfs_security_xattr_handler = {
352 .prefix = XATTR_SECURITY_PREFIX,
353 .set = sockfs_security_xattr_set,
356 static const struct xattr_handler *sockfs_xattr_handlers[] = {
357 &sockfs_xattr_handler,
358 &sockfs_security_xattr_handler,
362 static struct dentry *sockfs_mount(struct file_system_type *fs_type,
363 int flags, const char *dev_name, void *data)
365 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops,
366 sockfs_xattr_handlers,
367 &sockfs_dentry_operations, SOCKFS_MAGIC);
370 static struct vfsmount *sock_mnt __read_mostly;
372 static struct file_system_type sock_fs_type = {
374 .mount = sockfs_mount,
375 .kill_sb = kill_anon_super,
379 * Obtains the first available file descriptor and sets it up for use.
381 * These functions create file structures and maps them to fd space
382 * of the current process. On success it returns file descriptor
383 * and file struct implicitly stored in sock->file.
384 * Note that another thread may close file descriptor before we return
385 * from this function. We use the fact that now we do not refer
386 * to socket after mapping. If one day we will need it, this
387 * function will increment ref. count on file by 1.
389 * In any case returned fd MAY BE not valid!
390 * This race condition is unavoidable
391 * with shared fd spaces, we cannot solve it inside kernel,
392 * but we take care of internal coherence yet.
395 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
397 struct qstr name = { .name = "" };
403 name.len = strlen(name.name);
404 } else if (sock->sk) {
405 name.name = sock->sk->sk_prot_creator->name;
406 name.len = strlen(name.name);
408 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
409 if (unlikely(!path.dentry))
410 return ERR_PTR(-ENOMEM);
411 path.mnt = mntget(sock_mnt);
413 d_instantiate(path.dentry, SOCK_INODE(sock));
415 file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
418 /* drop dentry, keep inode */
419 ihold(d_inode(path.dentry));
425 file->f_flags = O_RDWR | (flags & O_NONBLOCK);
426 file->private_data = sock;
429 EXPORT_SYMBOL(sock_alloc_file);
431 static int sock_map_fd(struct socket *sock, int flags)
433 struct file *newfile;
434 int fd = get_unused_fd_flags(flags);
435 if (unlikely(fd < 0))
438 newfile = sock_alloc_file(sock, flags, NULL);
439 if (likely(!IS_ERR(newfile))) {
440 fd_install(fd, newfile);
445 return PTR_ERR(newfile);
448 struct socket *sock_from_file(struct file *file, int *err)
450 if (file->f_op == &socket_file_ops)
451 return file->private_data; /* set in sock_map_fd */
456 EXPORT_SYMBOL(sock_from_file);
459 * sockfd_lookup - Go from a file number to its socket slot
461 * @err: pointer to an error code return
463 * The file handle passed in is locked and the socket it is bound
464 * too is returned. If an error occurs the err pointer is overwritten
465 * with a negative errno code and NULL is returned. The function checks
466 * for both invalid handles and passing a handle which is not a socket.
468 * On a success the socket object pointer is returned.
471 struct socket *sockfd_lookup(int fd, int *err)
482 sock = sock_from_file(file, err);
487 EXPORT_SYMBOL(sockfd_lookup);
489 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
491 struct fd f = fdget(fd);
496 sock = sock_from_file(f.file, err);
498 *fput_needed = f.flags;
506 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
512 len = security_inode_listsecurity(d_inode(dentry), buffer, size);
522 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
527 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
534 static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr)
536 int err = simple_setattr(dentry, iattr);
538 if (!err && (iattr->ia_valid & ATTR_UID)) {
539 struct socket *sock = SOCKET_I(d_inode(dentry));
541 sock->sk->sk_uid = iattr->ia_uid;
547 static const struct inode_operations sockfs_inode_ops = {
548 .listxattr = sockfs_listxattr,
549 .setattr = sockfs_setattr,
553 * sock_alloc - allocate a socket
555 * Allocate a new inode and socket object. The two are bound together
556 * and initialised. The socket is then returned. If we are out of inodes
560 struct socket *sock_alloc(void)
565 inode = new_inode_pseudo(sock_mnt->mnt_sb);
569 sock = SOCKET_I(inode);
571 kmemcheck_annotate_bitfield(sock, type);
572 inode->i_ino = get_next_ino();
573 inode->i_mode = S_IFSOCK | S_IRWXUGO;
574 inode->i_uid = current_fsuid();
575 inode->i_gid = current_fsgid();
576 inode->i_op = &sockfs_inode_ops;
578 this_cpu_add(sockets_in_use, 1);
581 EXPORT_SYMBOL(sock_alloc);
584 * sock_release - close a socket
585 * @sock: socket to close
587 * The socket is released from the protocol stack if it has a release
588 * callback, and the inode is then released if the socket is bound to
589 * an inode not a file.
592 void sock_release(struct socket *sock)
595 struct module *owner = sock->ops->owner;
597 sock->ops->release(sock);
602 if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
603 pr_err("%s: fasync list not empty!\n", __func__);
605 this_cpu_sub(sockets_in_use, 1);
607 iput(SOCK_INODE(sock));
612 EXPORT_SYMBOL(sock_release);
614 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags)
616 u8 flags = *tx_flags;
618 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE)
619 flags |= SKBTX_HW_TSTAMP;
621 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
622 flags |= SKBTX_SW_TSTAMP;
624 if (tsflags & SOF_TIMESTAMPING_TX_SCHED)
625 flags |= SKBTX_SCHED_TSTAMP;
629 EXPORT_SYMBOL(__sock_tx_timestamp);
631 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
633 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
634 BUG_ON(ret == -EIOCBQUEUED);
638 int sock_sendmsg(struct socket *sock, struct msghdr *msg)
640 int err = security_socket_sendmsg(sock, msg,
643 return err ?: sock_sendmsg_nosec(sock, msg);
645 EXPORT_SYMBOL(sock_sendmsg);
647 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
648 struct kvec *vec, size_t num, size_t size)
650 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
651 return sock_sendmsg(sock, msg);
653 EXPORT_SYMBOL(kernel_sendmsg);
656 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
658 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
661 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
662 struct scm_timestamping tss;
664 struct skb_shared_hwtstamps *shhwtstamps =
667 /* Race occurred between timestamp enabling and packet
668 receiving. Fill in the current time for now. */
669 if (need_software_tstamp && skb->tstamp == 0)
670 __net_timestamp(skb);
672 if (need_software_tstamp) {
673 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
675 skb_get_timestamp(skb, &tv);
676 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
680 skb_get_timestampns(skb, &ts);
681 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
686 memset(&tss, 0, sizeof(tss));
687 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) &&
688 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
691 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
692 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
695 put_cmsg(msg, SOL_SOCKET,
696 SCM_TIMESTAMPING, sizeof(tss), &tss);
698 if (skb->len && (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS))
699 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
700 skb->len, skb->data);
703 EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
705 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
710 if (!sock_flag(sk, SOCK_WIFI_STATUS))
712 if (!skb->wifi_acked_valid)
715 ack = skb->wifi_acked;
717 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
719 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
721 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
724 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount)
725 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
726 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount);
729 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
732 sock_recv_timestamp(msg, sk, skb);
733 sock_recv_drops(msg, sk, skb);
735 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
737 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
740 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
743 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
745 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
747 return err ?: sock_recvmsg_nosec(sock, msg, flags);
749 EXPORT_SYMBOL(sock_recvmsg);
752 * kernel_recvmsg - Receive a message from a socket (kernel space)
753 * @sock: The socket to receive the message from
754 * @msg: Received message
755 * @vec: Input s/g array for message data
756 * @num: Size of input s/g array
757 * @size: Number of bytes to read
758 * @flags: Message flags (MSG_DONTWAIT, etc...)
760 * On return the msg structure contains the scatter/gather array passed in the
761 * vec argument. The array is modified so that it consists of the unfilled
762 * portion of the original array.
764 * The returned value is the total number of bytes received, or an error.
766 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
767 struct kvec *vec, size_t num, size_t size, int flags)
769 mm_segment_t oldfs = get_fs();
772 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
774 result = sock_recvmsg(sock, msg, flags);
778 EXPORT_SYMBOL(kernel_recvmsg);
780 static ssize_t sock_sendpage(struct file *file, struct page *page,
781 int offset, size_t size, loff_t *ppos, int more)
786 sock = file->private_data;
788 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
789 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
792 return kernel_sendpage(sock, page, offset, size, flags);
795 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
796 struct pipe_inode_info *pipe, size_t len,
799 struct socket *sock = file->private_data;
801 if (unlikely(!sock->ops->splice_read))
804 return sock->ops->splice_read(sock, ppos, pipe, len, flags);
807 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
809 struct file *file = iocb->ki_filp;
810 struct socket *sock = file->private_data;
811 struct msghdr msg = {.msg_iter = *to,
815 if (file->f_flags & O_NONBLOCK)
816 msg.msg_flags = MSG_DONTWAIT;
818 if (iocb->ki_pos != 0)
821 if (!iov_iter_count(to)) /* Match SYS5 behaviour */
824 res = sock_recvmsg(sock, &msg, msg.msg_flags);
829 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
831 struct file *file = iocb->ki_filp;
832 struct socket *sock = file->private_data;
833 struct msghdr msg = {.msg_iter = *from,
837 if (iocb->ki_pos != 0)
840 if (file->f_flags & O_NONBLOCK)
841 msg.msg_flags = MSG_DONTWAIT;
843 if (sock->type == SOCK_SEQPACKET)
844 msg.msg_flags |= MSG_EOR;
846 res = sock_sendmsg(sock, &msg);
847 *from = msg.msg_iter;
852 * Atomic setting of ioctl hooks to avoid race
853 * with module unload.
856 static DEFINE_MUTEX(br_ioctl_mutex);
857 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
859 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
861 mutex_lock(&br_ioctl_mutex);
862 br_ioctl_hook = hook;
863 mutex_unlock(&br_ioctl_mutex);
865 EXPORT_SYMBOL(brioctl_set);
867 static DEFINE_MUTEX(vlan_ioctl_mutex);
868 static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
870 void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
872 mutex_lock(&vlan_ioctl_mutex);
873 vlan_ioctl_hook = hook;
874 mutex_unlock(&vlan_ioctl_mutex);
876 EXPORT_SYMBOL(vlan_ioctl_set);
878 static DEFINE_MUTEX(dlci_ioctl_mutex);
879 static int (*dlci_ioctl_hook) (unsigned int, void __user *);
881 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
883 mutex_lock(&dlci_ioctl_mutex);
884 dlci_ioctl_hook = hook;
885 mutex_unlock(&dlci_ioctl_mutex);
887 EXPORT_SYMBOL(dlci_ioctl_set);
889 static long sock_do_ioctl(struct net *net, struct socket *sock,
890 unsigned int cmd, unsigned long arg)
893 void __user *argp = (void __user *)arg;
895 err = sock->ops->ioctl(sock, cmd, arg);
898 * If this ioctl is unknown try to hand it down
901 if (err == -ENOIOCTLCMD)
902 err = dev_ioctl(net, cmd, argp);
908 * With an ioctl, arg may well be a user mode pointer, but we don't know
909 * what to do with it - that's up to the protocol still.
912 static struct ns_common *get_net_ns(struct ns_common *ns)
914 return &get_net(container_of(ns, struct net, ns))->ns;
917 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
921 void __user *argp = (void __user *)arg;
925 sock = file->private_data;
928 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
929 err = dev_ioctl(net, cmd, argp);
931 #ifdef CONFIG_WEXT_CORE
932 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
933 err = dev_ioctl(net, cmd, argp);
940 if (get_user(pid, (int __user *)argp))
942 f_setown(sock->file, pid, 1);
947 err = put_user(f_getown(sock->file),
956 request_module("bridge");
958 mutex_lock(&br_ioctl_mutex);
960 err = br_ioctl_hook(net, cmd, argp);
961 mutex_unlock(&br_ioctl_mutex);
966 if (!vlan_ioctl_hook)
967 request_module("8021q");
969 mutex_lock(&vlan_ioctl_mutex);
971 err = vlan_ioctl_hook(net, argp);
972 mutex_unlock(&vlan_ioctl_mutex);
977 if (!dlci_ioctl_hook)
978 request_module("dlci");
980 mutex_lock(&dlci_ioctl_mutex);
982 err = dlci_ioctl_hook(cmd, argp);
983 mutex_unlock(&dlci_ioctl_mutex);
987 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
990 err = open_related_ns(&net->ns, get_net_ns);
993 err = sock_do_ioctl(net, sock, cmd, arg);
999 int sock_create_lite(int family, int type, int protocol, struct socket **res)
1002 struct socket *sock = NULL;
1004 err = security_socket_create(family, type, protocol, 1);
1008 sock = sock_alloc();
1015 err = security_socket_post_create(sock, family, type, protocol, 1);
1027 EXPORT_SYMBOL(sock_create_lite);
1029 /* No kernel lock held - perfect */
1030 static unsigned int sock_poll(struct file *file, poll_table *wait)
1032 unsigned int busy_flag = 0;
1033 struct socket *sock;
1036 * We can't return errors to poll, so it's either yes or no.
1038 sock = file->private_data;
1040 if (sk_can_busy_loop(sock->sk)) {
1041 /* this socket can poll_ll so tell the system call */
1042 busy_flag = POLL_BUSY_LOOP;
1044 /* once, only if requested by syscall */
1045 if (wait && (wait->_key & POLL_BUSY_LOOP))
1046 sk_busy_loop(sock->sk, 1);
1049 return busy_flag | sock->ops->poll(file, sock, wait);
1052 static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1054 struct socket *sock = file->private_data;
1056 return sock->ops->mmap(file, sock, vma);
1059 static int sock_close(struct inode *inode, struct file *filp)
1061 sock_release(SOCKET_I(inode));
1066 * Update the socket async list
1068 * Fasync_list locking strategy.
1070 * 1. fasync_list is modified only under process context socket lock
1071 * i.e. under semaphore.
1072 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1073 * or under socket lock
1076 static int sock_fasync(int fd, struct file *filp, int on)
1078 struct socket *sock = filp->private_data;
1079 struct sock *sk = sock->sk;
1080 struct socket_wq *wq;
1086 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk));
1087 fasync_helper(fd, filp, on, &wq->fasync_list);
1089 if (!wq->fasync_list)
1090 sock_reset_flag(sk, SOCK_FASYNC);
1092 sock_set_flag(sk, SOCK_FASYNC);
1098 /* This function may be called only under rcu_lock */
1100 int sock_wake_async(struct socket_wq *wq, int how, int band)
1102 if (!wq || !wq->fasync_list)
1106 case SOCK_WAKE_WAITD:
1107 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags))
1110 case SOCK_WAKE_SPACE:
1111 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags))
1116 kill_fasync(&wq->fasync_list, SIGIO, band);
1119 kill_fasync(&wq->fasync_list, SIGURG, band);
1124 EXPORT_SYMBOL(sock_wake_async);
1126 int __sock_create(struct net *net, int family, int type, int protocol,
1127 struct socket **res, int kern)
1130 struct socket *sock;
1131 const struct net_proto_family *pf;
1134 * Check protocol is in range
1136 if (family < 0 || family >= NPROTO)
1137 return -EAFNOSUPPORT;
1138 if (type < 0 || type >= SOCK_MAX)
1143 This uglymoron is moved from INET layer to here to avoid
1144 deadlock in module load.
1146 if (family == PF_INET && type == SOCK_PACKET) {
1147 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1152 err = security_socket_create(family, type, protocol, kern);
1157 * Allocate the socket and allow the family to set things up. if
1158 * the protocol is 0, the family is instructed to select an appropriate
1161 sock = sock_alloc();
1163 net_warn_ratelimited("socket: no more sockets\n");
1164 return -ENFILE; /* Not exactly a match, but its the
1165 closest posix thing */
1170 #ifdef CONFIG_MODULES
1171 /* Attempt to load a protocol module if the find failed.
1173 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1174 * requested real, full-featured networking support upon configuration.
1175 * Otherwise module support will break!
1177 if (rcu_access_pointer(net_families[family]) == NULL)
1178 request_module("net-pf-%d", family);
1182 pf = rcu_dereference(net_families[family]);
1183 err = -EAFNOSUPPORT;
1188 * We will call the ->create function, that possibly is in a loadable
1189 * module, so we have to bump that loadable module refcnt first.
1191 if (!try_module_get(pf->owner))
1194 /* Now protected by module ref count */
1197 err = pf->create(net, sock, protocol, kern);
1199 goto out_module_put;
1202 * Now to bump the refcnt of the [loadable] module that owns this
1203 * socket at sock_release time we decrement its refcnt.
1205 if (!try_module_get(sock->ops->owner))
1206 goto out_module_busy;
1209 * Now that we're done with the ->create function, the [loadable]
1210 * module can have its refcnt decremented
1212 module_put(pf->owner);
1213 err = security_socket_post_create(sock, family, type, protocol, kern);
1215 goto out_sock_release;
1221 err = -EAFNOSUPPORT;
1224 module_put(pf->owner);
1231 goto out_sock_release;
1233 EXPORT_SYMBOL(__sock_create);
1235 int sock_create(int family, int type, int protocol, struct socket **res)
1237 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1239 EXPORT_SYMBOL(sock_create);
1241 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res)
1243 return __sock_create(net, family, type, protocol, res, 1);
1245 EXPORT_SYMBOL(sock_create_kern);
1247 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1250 struct socket *sock;
1253 /* Check the SOCK_* constants for consistency. */
1254 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1255 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1256 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1257 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1259 flags = type & ~SOCK_TYPE_MASK;
1260 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1262 type &= SOCK_TYPE_MASK;
1264 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1265 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1267 retval = sock_create(family, type, protocol, &sock);
1271 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
1276 /* It may be already another descriptor 8) Not kernel problem. */
1285 * Create a pair of connected sockets.
1288 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1289 int __user *, usockvec)
1291 struct socket *sock1, *sock2;
1293 struct file *newfile1, *newfile2;
1296 flags = type & ~SOCK_TYPE_MASK;
1297 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1299 type &= SOCK_TYPE_MASK;
1301 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1302 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1305 * Obtain the first socket and check if the underlying protocol
1306 * supports the socketpair call.
1309 err = sock_create(family, type, protocol, &sock1);
1313 err = sock_create(family, type, protocol, &sock2);
1317 err = sock1->ops->socketpair(sock1, sock2);
1319 goto out_release_both;
1321 fd1 = get_unused_fd_flags(flags);
1322 if (unlikely(fd1 < 0)) {
1324 goto out_release_both;
1327 fd2 = get_unused_fd_flags(flags);
1328 if (unlikely(fd2 < 0)) {
1330 goto out_put_unused_1;
1333 newfile1 = sock_alloc_file(sock1, flags, NULL);
1334 if (IS_ERR(newfile1)) {
1335 err = PTR_ERR(newfile1);
1336 goto out_put_unused_both;
1339 newfile2 = sock_alloc_file(sock2, flags, NULL);
1340 if (IS_ERR(newfile2)) {
1341 err = PTR_ERR(newfile2);
1345 err = put_user(fd1, &usockvec[0]);
1349 err = put_user(fd2, &usockvec[1]);
1353 audit_fd_pair(fd1, fd2);
1355 fd_install(fd1, newfile1);
1356 fd_install(fd2, newfile2);
1357 /* fd1 and fd2 may be already another descriptors.
1358 * Not kernel problem.
1374 sock_release(sock2);
1377 out_put_unused_both:
1382 sock_release(sock2);
1384 sock_release(sock1);
1390 * Bind a name to a socket. Nothing much to do here since it's
1391 * the protocol's responsibility to handle the local address.
1393 * We move the socket address to kernel space before we call
1394 * the protocol layer (having also checked the address is ok).
1397 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1399 struct socket *sock;
1400 struct sockaddr_storage address;
1401 int err, fput_needed;
1403 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1405 err = move_addr_to_kernel(umyaddr, addrlen, &address);
1407 err = security_socket_bind(sock,
1408 (struct sockaddr *)&address,
1411 err = sock->ops->bind(sock,
1415 fput_light(sock->file, fput_needed);
1421 * Perform a listen. Basically, we allow the protocol to do anything
1422 * necessary for a listen, and if that works, we mark the socket as
1423 * ready for listening.
1426 SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1428 struct socket *sock;
1429 int err, fput_needed;
1432 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1434 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1435 if ((unsigned int)backlog > somaxconn)
1436 backlog = somaxconn;
1438 err = security_socket_listen(sock, backlog);
1440 err = sock->ops->listen(sock, backlog);
1442 fput_light(sock->file, fput_needed);
1448 * For accept, we attempt to create a new socket, set up the link
1449 * with the client, wake up the client, then return the new
1450 * connected fd. We collect the address of the connector in kernel
1451 * space and move it to user at the very end. This is unclean because
1452 * we open the socket then return an error.
1454 * 1003.1g adds the ability to recvmsg() to query connection pending
1455 * status to recvmsg. We need to add that support in a way thats
1456 * clean when we restucture accept also.
1459 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1460 int __user *, upeer_addrlen, int, flags)
1462 struct socket *sock, *newsock;
1463 struct file *newfile;
1464 int err, len, newfd, fput_needed;
1465 struct sockaddr_storage address;
1467 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1470 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1471 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1473 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1478 newsock = sock_alloc();
1482 newsock->type = sock->type;
1483 newsock->ops = sock->ops;
1486 * We don't need try_module_get here, as the listening socket (sock)
1487 * has the protocol module (sock->ops->owner) held.
1489 __module_get(newsock->ops->owner);
1491 newfd = get_unused_fd_flags(flags);
1492 if (unlikely(newfd < 0)) {
1494 sock_release(newsock);
1497 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1498 if (IS_ERR(newfile)) {
1499 err = PTR_ERR(newfile);
1500 put_unused_fd(newfd);
1501 sock_release(newsock);
1505 err = security_socket_accept(sock, newsock);
1509 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false);
1513 if (upeer_sockaddr) {
1514 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1516 err = -ECONNABORTED;
1519 err = move_addr_to_user(&address,
1520 len, upeer_sockaddr, upeer_addrlen);
1525 /* File flags are not inherited via accept() unlike another OSes. */
1527 fd_install(newfd, newfile);
1531 fput_light(sock->file, fput_needed);
1536 put_unused_fd(newfd);
1540 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1541 int __user *, upeer_addrlen)
1543 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1547 * Attempt to connect to a socket with the server address. The address
1548 * is in user space so we verify it is OK and move it to kernel space.
1550 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1553 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1554 * other SEQPACKET protocols that take time to connect() as it doesn't
1555 * include the -EINPROGRESS status for such sockets.
1558 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1561 struct socket *sock;
1562 struct sockaddr_storage address;
1563 int err, fput_needed;
1565 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1568 err = move_addr_to_kernel(uservaddr, addrlen, &address);
1573 security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1577 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1578 sock->file->f_flags);
1580 fput_light(sock->file, fput_needed);
1586 * Get the local address ('name') of a socket object. Move the obtained
1587 * name to user space.
1590 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1591 int __user *, usockaddr_len)
1593 struct socket *sock;
1594 struct sockaddr_storage address;
1595 int len, err, fput_needed;
1597 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1601 err = security_socket_getsockname(sock);
1605 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1608 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
1611 fput_light(sock->file, fput_needed);
1617 * Get the remote address ('name') of a socket object. Move the obtained
1618 * name to user space.
1621 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1622 int __user *, usockaddr_len)
1624 struct socket *sock;
1625 struct sockaddr_storage address;
1626 int len, err, fput_needed;
1628 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1630 err = security_socket_getpeername(sock);
1632 fput_light(sock->file, fput_needed);
1637 sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1640 err = move_addr_to_user(&address, len, usockaddr,
1642 fput_light(sock->file, fput_needed);
1648 * Send a datagram to a given address. We move the address into kernel
1649 * space and check the user space data area is readable before invoking
1653 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1654 unsigned int, flags, struct sockaddr __user *, addr,
1657 struct socket *sock;
1658 struct sockaddr_storage address;
1664 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter);
1667 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1671 msg.msg_name = NULL;
1672 msg.msg_control = NULL;
1673 msg.msg_controllen = 0;
1674 msg.msg_namelen = 0;
1676 err = move_addr_to_kernel(addr, addr_len, &address);
1679 msg.msg_name = (struct sockaddr *)&address;
1680 msg.msg_namelen = addr_len;
1682 if (sock->file->f_flags & O_NONBLOCK)
1683 flags |= MSG_DONTWAIT;
1684 msg.msg_flags = flags;
1685 err = sock_sendmsg(sock, &msg);
1688 fput_light(sock->file, fput_needed);
1694 * Send a datagram down a socket.
1697 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1698 unsigned int, flags)
1700 return sys_sendto(fd, buff, len, flags, NULL, 0);
1704 * Receive a frame from the socket and optionally record the address of the
1705 * sender. We verify the buffers are writable and if needed move the
1706 * sender address from kernel to user space.
1709 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1710 unsigned int, flags, struct sockaddr __user *, addr,
1711 int __user *, addr_len)
1713 struct socket *sock;
1716 struct sockaddr_storage address;
1720 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter);
1723 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1727 msg.msg_control = NULL;
1728 msg.msg_controllen = 0;
1729 /* Save some cycles and don't copy the address if not needed */
1730 msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
1731 /* We assume all kernel code knows the size of sockaddr_storage */
1732 msg.msg_namelen = 0;
1733 msg.msg_iocb = NULL;
1735 if (sock->file->f_flags & O_NONBLOCK)
1736 flags |= MSG_DONTWAIT;
1737 err = sock_recvmsg(sock, &msg, flags);
1739 if (err >= 0 && addr != NULL) {
1740 err2 = move_addr_to_user(&address,
1741 msg.msg_namelen, addr, addr_len);
1746 fput_light(sock->file, fput_needed);
1752 * Receive a datagram from a socket.
1755 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
1756 unsigned int, flags)
1758 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1762 * Set a socket option. Because we don't know the option lengths we have
1763 * to pass the user mode parameter for the protocols to sort out.
1766 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1767 char __user *, optval, int, optlen)
1769 int err, fput_needed;
1770 struct socket *sock;
1775 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1777 err = security_socket_setsockopt(sock, level, optname);
1781 if (level == SOL_SOCKET)
1783 sock_setsockopt(sock, level, optname, optval,
1787 sock->ops->setsockopt(sock, level, optname, optval,
1790 fput_light(sock->file, fput_needed);
1796 * Get a socket option. Because we don't know the option lengths we have
1797 * to pass a user mode parameter for the protocols to sort out.
1800 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1801 char __user *, optval, int __user *, optlen)
1803 int err, fput_needed;
1804 struct socket *sock;
1806 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1808 err = security_socket_getsockopt(sock, level, optname);
1812 if (level == SOL_SOCKET)
1814 sock_getsockopt(sock, level, optname, optval,
1818 sock->ops->getsockopt(sock, level, optname, optval,
1821 fput_light(sock->file, fput_needed);
1827 * Shutdown a socket.
1830 SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1832 int err, fput_needed;
1833 struct socket *sock;
1835 sock = sockfd_lookup_light(fd, &err, &fput_needed);
1837 err = security_socket_shutdown(sock, how);
1839 err = sock->ops->shutdown(sock, how);
1840 fput_light(sock->file, fput_needed);
1845 /* A couple of helpful macros for getting the address of the 32/64 bit
1846 * fields which are the same type (int / unsigned) on our platforms.
1848 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1849 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen)
1850 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags)
1852 struct used_address {
1853 struct sockaddr_storage name;
1854 unsigned int name_len;
1857 static int copy_msghdr_from_user(struct msghdr *kmsg,
1858 struct user_msghdr __user *umsg,
1859 struct sockaddr __user **save_addr,
1862 struct sockaddr __user *uaddr;
1863 struct iovec __user *uiov;
1867 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
1868 __get_user(uaddr, &umsg->msg_name) ||
1869 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
1870 __get_user(uiov, &umsg->msg_iov) ||
1871 __get_user(nr_segs, &umsg->msg_iovlen) ||
1872 __get_user(kmsg->msg_control, &umsg->msg_control) ||
1873 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
1874 __get_user(kmsg->msg_flags, &umsg->msg_flags))
1878 kmsg->msg_namelen = 0;
1880 if (kmsg->msg_namelen < 0)
1883 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
1884 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
1889 if (uaddr && kmsg->msg_namelen) {
1891 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
1897 kmsg->msg_name = NULL;
1898 kmsg->msg_namelen = 0;
1901 if (nr_segs > UIO_MAXIOV)
1904 kmsg->msg_iocb = NULL;
1906 return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
1907 UIO_FASTIOV, iov, &kmsg->msg_iter);
1910 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
1911 struct msghdr *msg_sys, unsigned int flags,
1912 struct used_address *used_address,
1913 unsigned int allowed_msghdr_flags)
1915 struct compat_msghdr __user *msg_compat =
1916 (struct compat_msghdr __user *)msg;
1917 struct sockaddr_storage address;
1918 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1919 unsigned char ctl[sizeof(struct cmsghdr) + 20]
1920 __aligned(sizeof(__kernel_size_t));
1921 /* 20 is size of ipv6_pktinfo */
1922 unsigned char *ctl_buf = ctl;
1926 msg_sys->msg_name = &address;
1928 if (MSG_CMSG_COMPAT & flags)
1929 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
1931 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
1937 if (msg_sys->msg_controllen > INT_MAX)
1939 flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
1940 ctl_len = msg_sys->msg_controllen;
1941 if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
1943 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
1947 ctl_buf = msg_sys->msg_control;
1948 ctl_len = msg_sys->msg_controllen;
1949 } else if (ctl_len) {
1950 BUILD_BUG_ON(sizeof(struct cmsghdr) !=
1951 CMSG_ALIGN(sizeof(struct cmsghdr)));
1952 if (ctl_len > sizeof(ctl)) {
1953 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
1954 if (ctl_buf == NULL)
1959 * Careful! Before this, msg_sys->msg_control contains a user pointer.
1960 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
1961 * checking falls down on this.
1963 if (copy_from_user(ctl_buf,
1964 (void __user __force *)msg_sys->msg_control,
1967 msg_sys->msg_control = ctl_buf;
1969 msg_sys->msg_flags = flags;
1971 if (sock->file->f_flags & O_NONBLOCK)
1972 msg_sys->msg_flags |= MSG_DONTWAIT;
1974 * If this is sendmmsg() and current destination address is same as
1975 * previously succeeded address, omit asking LSM's decision.
1976 * used_address->name_len is initialized to UINT_MAX so that the first
1977 * destination address never matches.
1979 if (used_address && msg_sys->msg_name &&
1980 used_address->name_len == msg_sys->msg_namelen &&
1981 !memcmp(&used_address->name, msg_sys->msg_name,
1982 used_address->name_len)) {
1983 err = sock_sendmsg_nosec(sock, msg_sys);
1986 err = sock_sendmsg(sock, msg_sys);
1988 * If this is sendmmsg() and sending to current destination address was
1989 * successful, remember it.
1991 if (used_address && err >= 0) {
1992 used_address->name_len = msg_sys->msg_namelen;
1993 if (msg_sys->msg_name)
1994 memcpy(&used_address->name, msg_sys->msg_name,
1995 used_address->name_len);
2000 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2007 * BSD sendmsg interface
2010 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
2012 int fput_needed, err;
2013 struct msghdr msg_sys;
2014 struct socket *sock;
2016 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2020 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
2022 fput_light(sock->file, fput_needed);
2027 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
2029 if (flags & MSG_CMSG_COMPAT)
2031 return __sys_sendmsg(fd, msg, flags);
2035 * Linux sendmmsg interface
2038 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2041 int fput_needed, err, datagrams;
2042 struct socket *sock;
2043 struct mmsghdr __user *entry;
2044 struct compat_mmsghdr __user *compat_entry;
2045 struct msghdr msg_sys;
2046 struct used_address used_address;
2047 unsigned int oflags = flags;
2049 if (vlen > UIO_MAXIOV)
2054 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2058 used_address.name_len = UINT_MAX;
2060 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2064 while (datagrams < vlen) {
2065 if (datagrams == vlen - 1)
2068 if (MSG_CMSG_COMPAT & flags) {
2069 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
2070 &msg_sys, flags, &used_address, MSG_EOR);
2073 err = __put_user(err, &compat_entry->msg_len);
2076 err = ___sys_sendmsg(sock,
2077 (struct user_msghdr __user *)entry,
2078 &msg_sys, flags, &used_address, MSG_EOR);
2081 err = put_user(err, &entry->msg_len);
2088 if (msg_data_left(&msg_sys))
2093 fput_light(sock->file, fput_needed);
2095 /* We only return an error if no datagrams were able to be sent */
2102 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2103 unsigned int, vlen, unsigned int, flags)
2105 if (flags & MSG_CMSG_COMPAT)
2107 return __sys_sendmmsg(fd, mmsg, vlen, flags);
2110 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
2111 struct msghdr *msg_sys, unsigned int flags, int nosec)
2113 struct compat_msghdr __user *msg_compat =
2114 (struct compat_msghdr __user *)msg;
2115 struct iovec iovstack[UIO_FASTIOV];
2116 struct iovec *iov = iovstack;
2117 unsigned long cmsg_ptr;
2121 /* kernel mode address */
2122 struct sockaddr_storage addr;
2124 /* user mode address pointers */
2125 struct sockaddr __user *uaddr;
2126 int __user *uaddr_len = COMPAT_NAMELEN(msg);
2128 msg_sys->msg_name = &addr;
2130 if (MSG_CMSG_COMPAT & flags)
2131 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
2133 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
2137 cmsg_ptr = (unsigned long)msg_sys->msg_control;
2138 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2140 /* We assume all kernel code knows the size of sockaddr_storage */
2141 msg_sys->msg_namelen = 0;
2143 if (sock->file->f_flags & O_NONBLOCK)
2144 flags |= MSG_DONTWAIT;
2145 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
2150 if (uaddr != NULL) {
2151 err = move_addr_to_user(&addr,
2152 msg_sys->msg_namelen, uaddr,
2157 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2161 if (MSG_CMSG_COMPAT & flags)
2162 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2163 &msg_compat->msg_controllen);
2165 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2166 &msg->msg_controllen);
2177 * BSD recvmsg interface
2180 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
2182 int fput_needed, err;
2183 struct msghdr msg_sys;
2184 struct socket *sock;
2186 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2190 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2192 fput_light(sock->file, fput_needed);
2197 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
2198 unsigned int, flags)
2200 if (flags & MSG_CMSG_COMPAT)
2202 return __sys_recvmsg(fd, msg, flags);
2206 * Linux recvmmsg interface
2209 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2210 unsigned int flags, struct timespec *timeout)
2212 int fput_needed, err, datagrams;
2213 struct socket *sock;
2214 struct mmsghdr __user *entry;
2215 struct compat_mmsghdr __user *compat_entry;
2216 struct msghdr msg_sys;
2217 struct timespec64 end_time;
2218 struct timespec64 timeout64;
2221 poll_select_set_timeout(&end_time, timeout->tv_sec,
2227 sock = sockfd_lookup_light(fd, &err, &fput_needed);
2231 err = sock_error(sock->sk);
2238 compat_entry = (struct compat_mmsghdr __user *)mmsg;
2240 while (datagrams < vlen) {
2242 * No need to ask LSM for more than the first datagram.
2244 if (MSG_CMSG_COMPAT & flags) {
2245 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
2246 &msg_sys, flags & ~MSG_WAITFORONE,
2250 err = __put_user(err, &compat_entry->msg_len);
2253 err = ___sys_recvmsg(sock,
2254 (struct user_msghdr __user *)entry,
2255 &msg_sys, flags & ~MSG_WAITFORONE,
2259 err = put_user(err, &entry->msg_len);
2267 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2268 if (flags & MSG_WAITFORONE)
2269 flags |= MSG_DONTWAIT;
2272 ktime_get_ts64(&timeout64);
2273 *timeout = timespec64_to_timespec(
2274 timespec64_sub(end_time, timeout64));
2275 if (timeout->tv_sec < 0) {
2276 timeout->tv_sec = timeout->tv_nsec = 0;
2280 /* Timeout, return less than vlen datagrams */
2281 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2285 /* Out of band data, return right away */
2286 if (msg_sys.msg_flags & MSG_OOB)
2294 if (datagrams == 0) {
2300 * We may return less entries than requested (vlen) if the
2301 * sock is non block and there aren't enough datagrams...
2303 if (err != -EAGAIN) {
2305 * ... or if recvmsg returns an error after we
2306 * received some datagrams, where we record the
2307 * error to return on the next call or if the
2308 * app asks about it using getsockopt(SO_ERROR).
2310 sock->sk->sk_err = -err;
2313 fput_light(sock->file, fput_needed);
2318 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2319 unsigned int, vlen, unsigned int, flags,
2320 struct timespec __user *, timeout)
2323 struct timespec timeout_sys;
2325 if (flags & MSG_CMSG_COMPAT)
2329 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2331 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2334 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2336 if (datagrams > 0 &&
2337 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2338 datagrams = -EFAULT;
2343 #ifdef __ARCH_WANT_SYS_SOCKETCALL
2344 /* Argument list sizes for sys_socketcall */
2345 #define AL(x) ((x) * sizeof(unsigned long))
2346 static const unsigned char nargs[21] = {
2347 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2348 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2349 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2356 * System call vectors.
2358 * Argument checking cleaned up. Saved 20% in size.
2359 * This function doesn't need to set the kernel lock because
2360 * it is set by the callees.
2363 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2365 unsigned long a[AUDITSC_ARGS];
2366 unsigned long a0, a1;
2370 if (call < 1 || call > SYS_SENDMMSG)
2374 if (len > sizeof(a))
2377 /* copy_from_user should be SMP safe. */
2378 if (copy_from_user(a, args, len))
2381 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2390 err = sys_socket(a0, a1, a[2]);
2393 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2396 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2399 err = sys_listen(a0, a1);
2402 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2403 (int __user *)a[2], 0);
2405 case SYS_GETSOCKNAME:
2407 sys_getsockname(a0, (struct sockaddr __user *)a1,
2408 (int __user *)a[2]);
2410 case SYS_GETPEERNAME:
2412 sys_getpeername(a0, (struct sockaddr __user *)a1,
2413 (int __user *)a[2]);
2415 case SYS_SOCKETPAIR:
2416 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2419 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2422 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2423 (struct sockaddr __user *)a[4], a[5]);
2426 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2429 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2430 (struct sockaddr __user *)a[4],
2431 (int __user *)a[5]);
2434 err = sys_shutdown(a0, a1);
2436 case SYS_SETSOCKOPT:
2437 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2439 case SYS_GETSOCKOPT:
2441 sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2442 (int __user *)a[4]);
2445 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
2448 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2451 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
2454 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2455 (struct timespec __user *)a[4]);
2458 err = sys_accept4(a0, (struct sockaddr __user *)a1,
2459 (int __user *)a[2], a[3]);
2468 #endif /* __ARCH_WANT_SYS_SOCKETCALL */
2471 * sock_register - add a socket protocol handler
2472 * @ops: description of protocol
2474 * This function is called by a protocol handler that wants to
2475 * advertise its address family, and have it linked into the
2476 * socket interface. The value ops->family corresponds to the
2477 * socket system call protocol family.
2479 int sock_register(const struct net_proto_family *ops)
2483 if (ops->family >= NPROTO) {
2484 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
2488 spin_lock(&net_family_lock);
2489 if (rcu_dereference_protected(net_families[ops->family],
2490 lockdep_is_held(&net_family_lock)))
2493 rcu_assign_pointer(net_families[ops->family], ops);
2496 spin_unlock(&net_family_lock);
2498 pr_info("NET: Registered protocol family %d\n", ops->family);
2501 EXPORT_SYMBOL(sock_register);
2504 * sock_unregister - remove a protocol handler
2505 * @family: protocol family to remove
2507 * This function is called by a protocol handler that wants to
2508 * remove its address family, and have it unlinked from the
2509 * new socket creation.
2511 * If protocol handler is a module, then it can use module reference
2512 * counts to protect against new references. If protocol handler is not
2513 * a module then it needs to provide its own protection in
2514 * the ops->create routine.
2516 void sock_unregister(int family)
2518 BUG_ON(family < 0 || family >= NPROTO);
2520 spin_lock(&net_family_lock);
2521 RCU_INIT_POINTER(net_families[family], NULL);
2522 spin_unlock(&net_family_lock);
2526 pr_info("NET: Unregistered protocol family %d\n", family);
2528 EXPORT_SYMBOL(sock_unregister);
2530 static int __init sock_init(void)
2534 * Initialize the network sysctl infrastructure.
2536 err = net_sysctl_init();
2541 * Initialize skbuff SLAB cache
2546 * Initialize the protocols module.
2551 err = register_filesystem(&sock_fs_type);
2554 sock_mnt = kern_mount(&sock_fs_type);
2555 if (IS_ERR(sock_mnt)) {
2556 err = PTR_ERR(sock_mnt);
2560 /* The real protocol initialization is performed in later initcalls.
2563 #ifdef CONFIG_NETFILTER
2564 err = netfilter_init();
2569 ptp_classifier_init();
2575 unregister_filesystem(&sock_fs_type);
2580 core_initcall(sock_init); /* early initcall */
2582 #ifdef CONFIG_PROC_FS
2583 void socket_seq_show(struct seq_file *seq)
2588 for_each_possible_cpu(cpu)
2589 counter += per_cpu(sockets_in_use, cpu);
2591 /* It can be negative, by the way. 8) */
2595 seq_printf(seq, "sockets: used %d\n", counter);
2597 #endif /* CONFIG_PROC_FS */
2599 #ifdef CONFIG_COMPAT
2600 static int do_siocgstamp(struct net *net, struct socket *sock,
2601 unsigned int cmd, void __user *up)
2603 mm_segment_t old_fs = get_fs();
2608 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2611 err = compat_put_timeval(&ktv, up);
2616 static int do_siocgstampns(struct net *net, struct socket *sock,
2617 unsigned int cmd, void __user *up)
2619 mm_segment_t old_fs = get_fs();
2620 struct timespec kts;
2624 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2627 err = compat_put_timespec(&kts, up);
2632 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2634 struct ifreq __user *uifr;
2637 uifr = compat_alloc_user_space(sizeof(struct ifreq));
2638 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2641 err = dev_ioctl(net, SIOCGIFNAME, uifr);
2645 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2651 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2653 struct compat_ifconf ifc32;
2655 struct ifconf __user *uifc;
2656 struct compat_ifreq __user *ifr32;
2657 struct ifreq __user *ifr;
2661 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2664 memset(&ifc, 0, sizeof(ifc));
2665 if (ifc32.ifcbuf == 0) {
2669 uifc = compat_alloc_user_space(sizeof(struct ifconf));
2671 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2672 sizeof(struct ifreq);
2673 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2675 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2676 ifr32 = compat_ptr(ifc32.ifcbuf);
2677 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2678 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2684 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2687 err = dev_ioctl(net, SIOCGIFCONF, uifc);
2691 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2695 ifr32 = compat_ptr(ifc32.ifcbuf);
2697 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2698 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2699 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2705 if (ifc32.ifcbuf == 0) {
2706 /* Translate from 64-bit structure multiple to
2710 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2715 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2721 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2723 struct compat_ethtool_rxnfc __user *compat_rxnfc;
2724 bool convert_in = false, convert_out = false;
2725 size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2726 struct ethtool_rxnfc __user *rxnfc;
2727 struct ifreq __user *ifr;
2728 u32 rule_cnt = 0, actual_rule_cnt;
2733 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2736 compat_rxnfc = compat_ptr(data);
2738 if (get_user(ethcmd, &compat_rxnfc->cmd))
2741 /* Most ethtool structures are defined without padding.
2742 * Unfortunately struct ethtool_rxnfc is an exception.
2747 case ETHTOOL_GRXCLSRLALL:
2748 /* Buffer size is variable */
2749 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2751 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2753 buf_size += rule_cnt * sizeof(u32);
2755 case ETHTOOL_GRXRINGS:
2756 case ETHTOOL_GRXCLSRLCNT:
2757 case ETHTOOL_GRXCLSRULE:
2758 case ETHTOOL_SRXCLSRLINS:
2761 case ETHTOOL_SRXCLSRLDEL:
2762 buf_size += sizeof(struct ethtool_rxnfc);
2767 ifr = compat_alloc_user_space(buf_size);
2768 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
2770 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2773 if (put_user(convert_in ? rxnfc : compat_ptr(data),
2774 &ifr->ifr_ifru.ifru_data))
2778 /* We expect there to be holes between fs.m_ext and
2779 * fs.ring_cookie and at the end of fs, but nowhere else.
2781 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2782 sizeof(compat_rxnfc->fs.m_ext) !=
2783 offsetof(struct ethtool_rxnfc, fs.m_ext) +
2784 sizeof(rxnfc->fs.m_ext));
2786 offsetof(struct compat_ethtool_rxnfc, fs.location) -
2787 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2788 offsetof(struct ethtool_rxnfc, fs.location) -
2789 offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2791 if (copy_in_user(rxnfc, compat_rxnfc,
2792 (void __user *)(&rxnfc->fs.m_ext + 1) -
2793 (void __user *)rxnfc) ||
2794 copy_in_user(&rxnfc->fs.ring_cookie,
2795 &compat_rxnfc->fs.ring_cookie,
2796 (void __user *)(&rxnfc->fs.location + 1) -
2797 (void __user *)&rxnfc->fs.ring_cookie) ||
2798 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2799 sizeof(rxnfc->rule_cnt)))
2803 ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2808 if (copy_in_user(compat_rxnfc, rxnfc,
2809 (const void __user *)(&rxnfc->fs.m_ext + 1) -
2810 (const void __user *)rxnfc) ||
2811 copy_in_user(&compat_rxnfc->fs.ring_cookie,
2812 &rxnfc->fs.ring_cookie,
2813 (const void __user *)(&rxnfc->fs.location + 1) -
2814 (const void __user *)&rxnfc->fs.ring_cookie) ||
2815 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2816 sizeof(rxnfc->rule_cnt)))
2819 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2820 /* As an optimisation, we only copy the actual
2821 * number of rules that the underlying
2822 * function returned. Since Mallory might
2823 * change the rule count in user memory, we
2824 * check that it is less than the rule count
2825 * originally given (as the user buffer size),
2826 * which has been range-checked.
2828 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2830 if (actual_rule_cnt < rule_cnt)
2831 rule_cnt = actual_rule_cnt;
2832 if (copy_in_user(&compat_rxnfc->rule_locs[0],
2833 &rxnfc->rule_locs[0],
2834 rule_cnt * sizeof(u32)))
2842 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2845 compat_uptr_t uptr32;
2846 struct ifreq __user *uifr;
2848 uifr = compat_alloc_user_space(sizeof(*uifr));
2849 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2852 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2855 uptr = compat_ptr(uptr32);
2857 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2860 return dev_ioctl(net, SIOCWANDEV, uifr);
2863 static int bond_ioctl(struct net *net, unsigned int cmd,
2864 struct compat_ifreq __user *ifr32)
2867 mm_segment_t old_fs;
2871 case SIOCBONDENSLAVE:
2872 case SIOCBONDRELEASE:
2873 case SIOCBONDSETHWADDR:
2874 case SIOCBONDCHANGEACTIVE:
2875 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2880 err = dev_ioctl(net, cmd,
2881 (struct ifreq __user __force *) &kifr);
2886 return -ENOIOCTLCMD;
2890 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */
2891 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd,
2892 struct compat_ifreq __user *u_ifreq32)
2894 struct ifreq __user *u_ifreq64;
2895 char tmp_buf[IFNAMSIZ];
2896 void __user *data64;
2899 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2902 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
2904 data64 = compat_ptr(data32);
2906 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2908 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
2911 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
2914 return dev_ioctl(net, cmd, u_ifreq64);
2917 static int dev_ifsioc(struct net *net, struct socket *sock,
2918 unsigned int cmd, struct compat_ifreq __user *uifr32)
2920 struct ifreq __user *uifr;
2923 uifr = compat_alloc_user_space(sizeof(*uifr));
2924 if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
2927 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
2938 case SIOCGIFBRDADDR:
2939 case SIOCGIFDSTADDR:
2940 case SIOCGIFNETMASK:
2945 if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
2953 static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
2954 struct compat_ifreq __user *uifr32)
2957 struct compat_ifmap __user *uifmap32;
2958 mm_segment_t old_fs;
2961 uifmap32 = &uifr32->ifr_ifru.ifru_map;
2962 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
2963 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2964 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2965 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2966 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq);
2967 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma);
2968 err |= get_user(ifr.ifr_map.port, &uifmap32->port);
2974 err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
2977 if (cmd == SIOCGIFMAP && !err) {
2978 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
2979 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
2980 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
2981 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
2982 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq);
2983 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma);
2984 err |= put_user(ifr.ifr_map.port, &uifmap32->port);
2993 struct sockaddr rt_dst; /* target address */
2994 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
2995 struct sockaddr rt_genmask; /* target network mask (IP) */
2996 unsigned short rt_flags;
2999 unsigned char rt_tos;
3000 unsigned char rt_class;
3002 short rt_metric; /* +1 for binary compatibility! */
3003 /* char * */ u32 rt_dev; /* forcing the device at add */
3004 u32 rt_mtu; /* per route MTU/Window */
3005 u32 rt_window; /* Window clamping */
3006 unsigned short rt_irtt; /* Initial RTT */
3009 struct in6_rtmsg32 {
3010 struct in6_addr rtmsg_dst;
3011 struct in6_addr rtmsg_src;
3012 struct in6_addr rtmsg_gateway;
3022 static int routing_ioctl(struct net *net, struct socket *sock,
3023 unsigned int cmd, void __user *argp)
3027 struct in6_rtmsg r6;
3031 mm_segment_t old_fs = get_fs();
3033 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3034 struct in6_rtmsg32 __user *ur6 = argp;
3035 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3036 3 * sizeof(struct in6_addr));
3037 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3038 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3039 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3040 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3041 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3042 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3043 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3047 struct rtentry32 __user *ur4 = argp;
3048 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3049 3 * sizeof(struct sockaddr));
3050 ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
3051 ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
3052 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
3053 ret |= get_user(r4.rt_window, &(ur4->rt_window));
3054 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
3055 ret |= get_user(rtdev, &(ur4->rt_dev));
3057 ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3058 r4.rt_dev = (char __user __force *)devname;
3072 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3079 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3080 * for some operations; this forces use of the newer bridge-utils that
3081 * use compatible ioctls
3083 static int old_bridge_ioctl(compat_ulong_t __user *argp)
3087 if (get_user(tmp, argp))
3089 if (tmp == BRCTL_GET_VERSION)
3090 return BRCTL_VERSION + 1;
3094 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3095 unsigned int cmd, unsigned long arg)
3097 void __user *argp = compat_ptr(arg);
3098 struct sock *sk = sock->sk;
3099 struct net *net = sock_net(sk);
3101 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3102 return compat_ifr_data_ioctl(net, cmd, argp);
3107 return old_bridge_ioctl(argp);
3109 return dev_ifname32(net, argp);
3111 return dev_ifconf(net, argp);
3113 return ethtool_ioctl(net, argp);
3115 return compat_siocwandev(net, argp);
3118 return compat_sioc_ifmap(net, cmd, argp);
3119 case SIOCBONDENSLAVE:
3120 case SIOCBONDRELEASE:
3121 case SIOCBONDSETHWADDR:
3122 case SIOCBONDCHANGEACTIVE:
3123 return bond_ioctl(net, cmd, argp);
3126 return routing_ioctl(net, sock, cmd, argp);
3128 return do_siocgstamp(net, sock, cmd, argp);
3130 return do_siocgstampns(net, sock, cmd, argp);
3131 case SIOCBONDSLAVEINFOQUERY:
3132 case SIOCBONDINFOQUERY:
3135 return compat_ifr_data_ioctl(net, cmd, argp);
3148 return sock_ioctl(file, cmd, arg);
3165 case SIOCSIFHWBROADCAST:
3167 case SIOCGIFBRDADDR:
3168 case SIOCSIFBRDADDR:
3169 case SIOCGIFDSTADDR:
3170 case SIOCSIFDSTADDR:
3171 case SIOCGIFNETMASK:
3172 case SIOCSIFNETMASK:
3183 return dev_ifsioc(net, sock, cmd, argp);
3189 return sock_do_ioctl(net, sock, cmd, arg);
3192 return -ENOIOCTLCMD;
3195 static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3198 struct socket *sock = file->private_data;
3199 int ret = -ENOIOCTLCMD;
3206 if (sock->ops->compat_ioctl)
3207 ret = sock->ops->compat_ioctl(sock, cmd, arg);
3209 if (ret == -ENOIOCTLCMD &&
3210 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3211 ret = compat_wext_handle_ioctl(net, cmd, arg);
3213 if (ret == -ENOIOCTLCMD)
3214 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3220 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3222 return sock->ops->bind(sock, addr, addrlen);
3224 EXPORT_SYMBOL(kernel_bind);
3226 int kernel_listen(struct socket *sock, int backlog)
3228 return sock->ops->listen(sock, backlog);
3230 EXPORT_SYMBOL(kernel_listen);
3232 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3234 struct sock *sk = sock->sk;
3237 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3242 err = sock->ops->accept(sock, *newsock, flags, true);
3244 sock_release(*newsock);
3249 (*newsock)->ops = sock->ops;
3250 __module_get((*newsock)->ops->owner);
3255 EXPORT_SYMBOL(kernel_accept);
3257 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3260 return sock->ops->connect(sock, addr, addrlen, flags);
3262 EXPORT_SYMBOL(kernel_connect);
3264 int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3267 return sock->ops->getname(sock, addr, addrlen, 0);
3269 EXPORT_SYMBOL(kernel_getsockname);
3271 int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3274 return sock->ops->getname(sock, addr, addrlen, 1);
3276 EXPORT_SYMBOL(kernel_getpeername);
3278 int kernel_getsockopt(struct socket *sock, int level, int optname,
3279 char *optval, int *optlen)
3281 mm_segment_t oldfs = get_fs();
3282 char __user *uoptval;
3283 int __user *uoptlen;
3286 uoptval = (char __user __force *) optval;
3287 uoptlen = (int __user __force *) optlen;
3290 if (level == SOL_SOCKET)
3291 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3293 err = sock->ops->getsockopt(sock, level, optname, uoptval,
3298 EXPORT_SYMBOL(kernel_getsockopt);
3300 int kernel_setsockopt(struct socket *sock, int level, int optname,
3301 char *optval, unsigned int optlen)
3303 mm_segment_t oldfs = get_fs();
3304 char __user *uoptval;
3307 uoptval = (char __user __force *) optval;
3310 if (level == SOL_SOCKET)
3311 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3313 err = sock->ops->setsockopt(sock, level, optname, uoptval,
3318 EXPORT_SYMBOL(kernel_setsockopt);
3320 int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3321 size_t size, int flags)
3323 if (sock->ops->sendpage)
3324 return sock->ops->sendpage(sock, page, offset, size, flags);
3326 return sock_no_sendpage(sock, page, offset, size, flags);
3328 EXPORT_SYMBOL(kernel_sendpage);
3330 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3332 mm_segment_t oldfs = get_fs();
3336 err = sock->ops->ioctl(sock, cmd, arg);
3341 EXPORT_SYMBOL(kernel_sock_ioctl);
3343 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3345 return sock->ops->shutdown(sock, how);
3347 EXPORT_SYMBOL(kernel_sock_shutdown);