TOMOYO Linux Cross Reference
Linux/net/socket.c

   /*
    * NET          An implementation of the SOCKET network access protocol.
    *
    * Version:     @(#)socket.c    1.1.93  18/02/95
    *
    * Authors:     Orest Zborowski, <obz@Kodak.COM>
    *              Ross Biro
    *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
    *
   * Fixes:
   *              Anonymous       :       NOTSOCK/BADF cleanup. Error fix in
   *                                      shutdown()
   *              Alan Cox        :       verify_area() fixes
   *              Alan Cox        :       Removed DDI
   *              Jonathan Kamens :       SOCK_DGRAM reconnect bug
   *              Alan Cox        :       Moved a load of checks to the very
   *                                      top level.
   *              Alan Cox        :       Move address structures to/from user
   *                                      mode above the protocol layers.
   *              Rob Janssen     :       Allow 0 length sends.
   *              Alan Cox        :       Asynchronous I/O support (cribbed from the
   *                                      tty drivers).
   *              Niibe Yutaka    :       Asynchronous I/O for writes (4.4BSD style)
   *              Jeff Uphoff     :       Made max number of sockets command-line
   *                                      configurable.
   *              Matti Aarnio    :       Made the number of sockets dynamic,
   *                                      to be allocated when needed, and mr.
   *                                      Uphoff's max is used as max to be
   *                                      allowed to allocate.
   *              Linus           :       Argh. removed all the socket allocation
   *                                      altogether: it's in the inode now.
   *              Alan Cox        :       Made sock_alloc()/sock_release() public
   *                                      for NetROM and future kernel nfsd type
   *                                      stuff.
   *              Alan Cox        :       sendmsg/recvmsg basics.
   *              Tom Dyas        :       Export net symbols.
   *              Marcin Dalecki  :       Fixed problems with CONFIG_NET="n".
   *              Alan Cox        :       Added thread locking to sys_* calls
   *                                      for sockets. May have errors at the
   *                                      moment.
   *              Kevin Buhr      :       Fixed the dumb errors in the above.
   *              Andi Kleen      :       Some small cleanups, optimizations,
   *                                      and fixed a copy_from_user() bug.
   *              Tigran Aivazian :       sys_send(args) calls sys_sendto(args, NULL, 0)
   *              Tigran Aivazian :       Made listen(2) backlog sanity checks
   *                                      protocol-independent
   *
   *
   *              This program is free software; you can redistribute it and/or
   *              modify it under the terms of the GNU General Public License
   *              as published by the Free Software Foundation; either version
   *              2 of the License, or (at your option) any later version.
   *
   *
   *      This module is effectively the top level interface to the BSD socket
   *      paradigm.
   *
   *      Based upon Swansea University Computer Society NET3.039
   */
  
  #include <linux/mm.h>
  #include <linux/socket.h>
  #include <linux/file.h>
  #include <linux/net.h>
  #include <linux/interrupt.h>
  #include <linux/thread_info.h>
  #include <linux/rcupdate.h>
  #include <linux/netdevice.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>
  #include <linux/mutex.h>
  #include <linux/if_bridge.h>
  #include <linux/if_frad.h>
  #include <linux/if_vlan.h>
  #include <linux/init.h>
  #include <linux/poll.h>
  #include <linux/cache.h>
  #include <linux/module.h>
  #include <linux/highmem.h>
  #include <linux/mount.h>
  #include <linux/security.h>
  #include <linux/syscalls.h>
  #include <linux/compat.h>
  #include <linux/kmod.h>
  #include <linux/audit.h>
  #include <linux/wireless.h>
  #include <linux/nsproxy.h>
  #include <linux/magic.h>
  #include <linux/slab.h>
  #include <linux/xattr.h>
  
  #include <asm/uaccess.h>
  #include <asm/unistd.h>
  
  #include <net/compat.h>
  #include <net/wext.h>
  #include <net/cls_cgroup.h>
  
  #include <net/sock.h>
 #include <linux/netfilter.h>
 
 #include <linux/if_tun.h>
 #include <linux/ipv6_route.h>
 #include <linux/route.h>
 #include <linux/sockios.h>
 #include <linux/atalk.h>
 #include <net/busy_poll.h>
 
 #ifdef CONFIG_NET_RX_BUSY_POLL
 unsigned int sysctl_net_busy_read __read_mostly;
 unsigned int sysctl_net_busy_poll __read_mostly;
 #endif
 
 static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
                          unsigned long nr_segs, loff_t pos);
 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
                           unsigned long nr_segs, loff_t pos);
 static int sock_mmap(struct file *file, struct vm_area_struct *vma);
 
 static int sock_close(struct inode *inode, struct file *file);
 static unsigned int sock_poll(struct file *file,
                               struct poll_table_struct *wait);
 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 #ifdef CONFIG_COMPAT
 static long compat_sock_ioctl(struct file *file,
                               unsigned int cmd, unsigned long arg);
 #endif
 static int sock_fasync(int fd, struct file *filp, int on);
 static ssize_t sock_sendpage(struct file *file, struct page *page,
                              int offset, size_t size, loff_t *ppos, int more);
 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
                                 struct pipe_inode_info *pipe, size_t len,
                                 unsigned int flags);
 
 /*
  *      Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
  *      in the operation structures but are done directly via the socketcall() multiplexor.
  */
 
 static const struct file_operations socket_file_ops = {
         .owner =        THIS_MODULE,
         .llseek =       no_llseek,
         .aio_read =     sock_aio_read,
         .aio_write =    sock_aio_write,
         .poll =         sock_poll,
         .unlocked_ioctl = sock_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl = compat_sock_ioctl,
 #endif
         .mmap =         sock_mmap,
         .open =         sock_no_open,   /* special open code to disallow open via /proc */
         .release =      sock_close,
         .fasync =       sock_fasync,
         .sendpage =     sock_sendpage,
         .splice_write = generic_splice_sendpage,
         .splice_read =  sock_splice_read,
 };
 
 /*
  *      The protocol list. Each protocol is registered in here.
  */
 
 static DEFINE_SPINLOCK(net_family_lock);
 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
 
 /*
  *      Statistics counters of the socket lists
  */
 
 static DEFINE_PER_CPU(int, sockets_in_use);
 
 /*
  * Support routines.
  * Move socket addresses back and forth across the kernel/user
  * divide and look after the messy bits.
  */
 
 /**
  *      move_addr_to_kernel     -       copy a socket address into kernel space
  *      @uaddr: Address in user space
  *      @kaddr: Address in kernel space
  *      @ulen: Length in user space
  *
  *      The address is copied into kernel space. If the provided address is
  *      too long an error code of -EINVAL is returned. If the copy gives
  *      invalid addresses -EFAULT is returned. On a success 0 is returned.
  */
 
 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
 {
         if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
                 return -EINVAL;
         if (ulen == 0)
                 return 0;
         if (copy_from_user(kaddr, uaddr, ulen))
                 return -EFAULT;
         return audit_sockaddr(ulen, kaddr);
 }
 
 /**
  *      move_addr_to_user       -       copy an address to user space
  *      @kaddr: kernel space address
  *      @klen: length of address in kernel
  *      @uaddr: user space address
  *      @ulen: pointer to user length field
  *
  *      The value pointed to by ulen on entry is the buffer length available.
  *      This is overwritten with the buffer space used. -EINVAL is returned
  *      if an overlong buffer is specified or a negative buffer size. -EFAULT
  *      is returned if either the buffer or the length field are not
  *      accessible.
  *      After copying the data up to the limit the user specifies, the true
  *      length of the data is written over the length limit the user
  *      specified. Zero is returned for a success.
  */
 
 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
                              void __user *uaddr, int __user *ulen)
 {
         int err;
         int len;
 
         err = get_user(len, ulen);
         if (err)
                 return err;
         if (len > klen)
                 len = klen;
         if (len < 0 || len > sizeof(struct sockaddr_storage))
                 return -EINVAL;
         if (len) {
                 if (audit_sockaddr(klen, kaddr))
                         return -ENOMEM;
                 if (copy_to_user(uaddr, kaddr, len))
                         return -EFAULT;
         }
         /*
          *      "fromlen shall refer to the value before truncation.."
          *                      1003.1g
          */
         return __put_user(klen, ulen);
 }
 
 static struct kmem_cache *sock_inode_cachep __read_mostly;
 
 static struct inode *sock_alloc_inode(struct super_block *sb)
 {
         struct socket_alloc *ei;
         struct socket_wq *wq;
 
         ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
         if (!ei)
                 return NULL;
         wq = kmalloc(sizeof(*wq), GFP_KERNEL);
         if (!wq) {
                 kmem_cache_free(sock_inode_cachep, ei);
                 return NULL;
         }
         init_waitqueue_head(&wq->wait);
         wq->fasync_list = NULL;
         RCU_INIT_POINTER(ei->socket.wq, wq);
 
         ei->socket.state = SS_UNCONNECTED;
         ei->socket.flags = 0;
         ei->socket.ops = NULL;
         ei->socket.sk = NULL;
         ei->socket.file = NULL;
 
         return &ei->vfs_inode;
 }
 
 static void sock_destroy_inode(struct inode *inode)
 {
         struct socket_alloc *ei;
         struct socket_wq *wq;
 
         ei = container_of(inode, struct socket_alloc, vfs_inode);
         wq = rcu_dereference_protected(ei->socket.wq, 1);
         kfree_rcu(wq, rcu);
         kmem_cache_free(sock_inode_cachep, ei);
 }
 
 static void init_once(void *foo)
 {
         struct socket_alloc *ei = (struct socket_alloc *)foo;
 
         inode_init_once(&ei->vfs_inode);
 }
 
 static int init_inodecache(void)
 {
         sock_inode_cachep = kmem_cache_create("sock_inode_cache",
                                               sizeof(struct socket_alloc),
                                               0,
                                               (SLAB_HWCACHE_ALIGN |
                                                SLAB_RECLAIM_ACCOUNT |
                                                SLAB_MEM_SPREAD),
                                               init_once);
         if (sock_inode_cachep == NULL)
                 return -ENOMEM;
         return 0;
 }
 
 static const struct super_operations sockfs_ops = {
         .alloc_inode    = sock_alloc_inode,
         .destroy_inode  = sock_destroy_inode,
         .statfs         = simple_statfs,
 };
 
 /*
  * sockfs_dname() is called from d_path().
  */
 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
 {
         return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
                                 dentry->d_inode->i_ino);
 }
 
 static const struct dentry_operations sockfs_dentry_operations = {
         .d_dname  = sockfs_dname,
 };
 
 static struct dentry *sockfs_mount(struct file_system_type *fs_type,
                          int flags, const char *dev_name, void *data)
 {
         return mount_pseudo(fs_type, "socket:", &sockfs_ops,
                 &sockfs_dentry_operations, SOCKFS_MAGIC);
 }
 
 static struct vfsmount *sock_mnt __read_mostly;
 
 static struct file_system_type sock_fs_type = {
         .name =         "sockfs",
         .mount =        sockfs_mount,
         .kill_sb =      kill_anon_super,
 };
 
 /*
  *      Obtains the first available file descriptor and sets it up for use.
  *
  *      These functions create file structures and maps them to fd space
  *      of the current process. On success it returns file descriptor
  *      and file struct implicitly stored in sock->file.
  *      Note that another thread may close file descriptor before we return
  *      from this function. We use the fact that now we do not refer
  *      to socket after mapping. If one day we will need it, this
  *      function will increment ref. count on file by 1.
  *
  *      In any case returned fd MAY BE not valid!
  *      This race condition is unavoidable
  *      with shared fd spaces, we cannot solve it inside kernel,
  *      but we take care of internal coherence yet.
  */
 
 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
 {
         struct qstr name = { .name = "" };
         struct path path;
         struct file *file;
 
         if (dname) {
                 name.name = dname;
                 name.len = strlen(name.name);
         } else if (sock->sk) {
                 name.name = sock->sk->sk_prot_creator->name;
                 name.len = strlen(name.name);
         }
         path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
         if (unlikely(!path.dentry))
                 return ERR_PTR(-ENOMEM);
         path.mnt = mntget(sock_mnt);
 
         d_instantiate(path.dentry, SOCK_INODE(sock));
         SOCK_INODE(sock)->i_fop = &socket_file_ops;
 
         file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
                   &socket_file_ops);
         if (unlikely(IS_ERR(file))) {
                 /* drop dentry, keep inode */
                 ihold(path.dentry->d_inode);
                 path_put(&path);
                 return file;
         }
 
         sock->file = file;
         file->f_flags = O_RDWR | (flags & O_NONBLOCK);
         file->private_data = sock;
         return file;
 }
 EXPORT_SYMBOL(sock_alloc_file);
 
 static int sock_map_fd(struct socket *sock, int flags)
 {
         struct file *newfile;
         int fd = get_unused_fd_flags(flags);
         if (unlikely(fd < 0))
                 return fd;
 
         newfile = sock_alloc_file(sock, flags, NULL);
         if (likely(!IS_ERR(newfile))) {
                 fd_install(fd, newfile);
                 return fd;
         }
 
         put_unused_fd(fd);
         return PTR_ERR(newfile);
 }
 
 struct socket *sock_from_file(struct file *file, int *err)
 {
         if (file->f_op == &socket_file_ops)
                 return file->private_data;      /* set in sock_map_fd */
 
         *err = -ENOTSOCK;
         return NULL;
 }
 EXPORT_SYMBOL(sock_from_file);
 
 /**
  *      sockfd_lookup - Go from a file number to its socket slot
  *      @fd: file handle
  *      @err: pointer to an error code return
  *
  *      The file handle passed in is locked and the socket it is bound
  *      too is returned. If an error occurs the err pointer is overwritten
  *      with a negative errno code and NULL is returned. The function checks
  *      for both invalid handles and passing a handle which is not a socket.
  *
  *      On a success the socket object pointer is returned.
  */
 
 struct socket *sockfd_lookup(int fd, int *err)
 {
         struct file *file;
         struct socket *sock;
 
         file = fget(fd);
         if (!file) {
                 *err = -EBADF;
                 return NULL;
         }
 
         sock = sock_from_file(file, err);
         if (!sock)
                 fput(file);
         return sock;
 }
 EXPORT_SYMBOL(sockfd_lookup);
 
 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
 {
         struct file *file;
         struct socket *sock;
 
         *err = -EBADF;
         file = fget_light(fd, fput_needed);
         if (file) {
                 sock = sock_from_file(file, err);
                 if (sock)
                         return sock;
                 fput_light(file, *fput_needed);
         }
         return NULL;
 }
 
 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
 static ssize_t sockfs_getxattr(struct dentry *dentry,
                                const char *name, void *value, size_t size)
 {
         const char *proto_name;
         size_t proto_size;
         int error;
 
         error = -ENODATA;
         if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
                 proto_name = dentry->d_name.name;
                 proto_size = strlen(proto_name);
 
                 if (value) {
                         error = -ERANGE;
                         if (proto_size + 1 > size)
                                 goto out;
 
                         strncpy(value, proto_name, proto_size + 1);
                 }
                 error = proto_size + 1;
         }
 
 out:
         return error;
 }
 
 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
                                 size_t size)
 {
         ssize_t len;
         ssize_t used = 0;
 
         len = security_inode_listsecurity(dentry->d_inode, buffer, size);
         if (len < 0)
                 return len;
         used += len;
         if (buffer) {
                 if (size < used)
                         return -ERANGE;
                 buffer += len;
         }
 
         len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
         used += len;
         if (buffer) {
                 if (size < used)
                         return -ERANGE;
                 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
                 buffer += len;
         }
 
         return used;
 }
 
 static const struct inode_operations sockfs_inode_ops = {
         .getxattr = sockfs_getxattr,
         .listxattr = sockfs_listxattr,
 };
 
 /**
  *      sock_alloc      -       allocate a socket
  *
  *      Allocate a new inode and socket object. The two are bound together
  *      and initialised. The socket is then returned. If we are out of inodes
  *      NULL is returned.
  */
 
 static struct socket *sock_alloc(void)
 {
         struct inode *inode;
         struct socket *sock;
 
         inode = new_inode_pseudo(sock_mnt->mnt_sb);
         if (!inode)
                 return NULL;
 
         sock = SOCKET_I(inode);
 
         kmemcheck_annotate_bitfield(sock, type);
         inode->i_ino = get_next_ino();
         inode->i_mode = S_IFSOCK | S_IRWXUGO;
         inode->i_uid = current_fsuid();
         inode->i_gid = current_fsgid();
         inode->i_op = &sockfs_inode_ops;
 
         this_cpu_add(sockets_in_use, 1);
         return sock;
 }
 
 /*
  *      In theory you can't get an open on this inode, but /proc provides
  *      a back door. Remember to keep it shut otherwise you'll let the
  *      creepy crawlies in.
  */
 
 static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
 {
         return -ENXIO;
 }
 
 const struct file_operations bad_sock_fops = {
         .owner = THIS_MODULE,
         .open = sock_no_open,
         .llseek = noop_llseek,
 };
 
 /**
  *      sock_release    -       close a socket
  *      @sock: socket to close
  *
  *      The socket is released from the protocol stack if it has a release
  *      callback, and the inode is then released if the socket is bound to
  *      an inode not a file.
  */
 
 void sock_release(struct socket *sock)
 {
         if (sock->ops) {
                 struct module *owner = sock->ops->owner;
 
                 sock->ops->release(sock);
                 sock->ops = NULL;
                 module_put(owner);
         }
 
         if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
                 printk(KERN_ERR "sock_release: fasync list not empty!\n");
 
         if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
                 return;
 
         this_cpu_sub(sockets_in_use, 1);
         if (!sock->file) {
                 iput(SOCK_INODE(sock));
                 return;
         }
         sock->file = NULL;
 }
 EXPORT_SYMBOL(sock_release);
 
 void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
 {
         *tx_flags = 0;
         if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
                 *tx_flags |= SKBTX_HW_TSTAMP;
         if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
                 *tx_flags |= SKBTX_SW_TSTAMP;
         if (sock_flag(sk, SOCK_WIFI_STATUS))
                 *tx_flags |= SKBTX_WIFI_STATUS;
 }
 EXPORT_SYMBOL(sock_tx_timestamp);
 
 static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
                                        struct msghdr *msg, size_t size)
 {
         struct sock_iocb *si = kiocb_to_siocb(iocb);
 
         si->sock = sock;
         si->scm = NULL;
         si->msg = msg;
         si->size = size;
 
         return sock->ops->sendmsg(iocb, sock, msg, size);
 }
 
 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
                                  struct msghdr *msg, size_t size)
 {
         int err = security_socket_sendmsg(sock, msg, size);
 
         return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
 }
 
 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 {
         struct kiocb iocb;
         struct sock_iocb siocb;
         int ret;
 
         init_sync_kiocb(&iocb, NULL);
         iocb.private = &siocb;
         ret = __sock_sendmsg(&iocb, sock, msg, size);
         if (-EIOCBQUEUED == ret)
                 ret = wait_on_sync_kiocb(&iocb);
         return ret;
 }
 EXPORT_SYMBOL(sock_sendmsg);
 
 static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
 {
         struct kiocb iocb;
         struct sock_iocb siocb;
         int ret;
 
         init_sync_kiocb(&iocb, NULL);
         iocb.private = &siocb;
         ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
         if (-EIOCBQUEUED == ret)
                 ret = wait_on_sync_kiocb(&iocb);
         return ret;
 }
 
 int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
                    struct kvec *vec, size_t num, size_t size)
 {
         mm_segment_t oldfs = get_fs();
         int result;
 
         set_fs(KERNEL_DS);
         /*
          * the following is safe, since for compiler definitions of kvec and
          * iovec are identical, yielding the same in-core layout and alignment
          */
         msg->msg_iov = (struct iovec *)vec;
         msg->msg_iovlen = num;
         result = sock_sendmsg(sock, msg, size);
         set_fs(oldfs);
         return result;
 }
 EXPORT_SYMBOL(kernel_sendmsg);
 
 /*
  * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
  */
 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
         struct sk_buff *skb)
 {
         int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
         struct timespec ts[3];
         int empty = 1;
         struct skb_shared_hwtstamps *shhwtstamps =
                 skb_hwtstamps(skb);
 
         /* Race occurred between timestamp enabling and packet
            receiving.  Fill in the current time for now. */
         if (need_software_tstamp && skb->tstamp.tv64 == 0)
                 __net_timestamp(skb);
 
         if (need_software_tstamp) {
                 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
                         struct timeval tv;
                         skb_get_timestamp(skb, &tv);
                         put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
                                  sizeof(tv), &tv);
                 } else {
                         skb_get_timestampns(skb, &ts[0]);
                         put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
                                  sizeof(ts[0]), &ts[0]);
                 }
         }
 
 
         memset(ts, 0, sizeof(ts));
         if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
             ktime_to_timespec_cond(skb->tstamp, ts + 0))
                 empty = 0;
         if (shhwtstamps) {
                 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
                     ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1))
                         empty = 0;
                 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
                     ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
                         empty = 0;
         }
         if (!empty)
                 put_cmsg(msg, SOL_SOCKET,
                          SCM_TIMESTAMPING, sizeof(ts), &ts);
 }
 EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
 
 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
         struct sk_buff *skb)
 {
         int ack;
 
         if (!sock_flag(sk, SOCK_WIFI_STATUS))
                 return;
         if (!skb->wifi_acked_valid)
                 return;
 
         ack = skb->wifi_acked;
 
         put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
 }
 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
 
 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
                                    struct sk_buff *skb)
 {
         if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
                 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
                         sizeof(__u32), &skb->dropcount);
 }
 
 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
         struct sk_buff *skb)
 {
         sock_recv_timestamp(msg, sk, skb);
         sock_recv_drops(msg, sk, skb);
 }
 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
 
 static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
                                        struct msghdr *msg, size_t size, int flags)
 {
         struct sock_iocb *si = kiocb_to_siocb(iocb);
 
         si->sock = sock;
         si->scm = NULL;
         si->msg = msg;
         si->size = size;
         si->flags = flags;
 
         return sock->ops->recvmsg(iocb, sock, msg, size, flags);
 }
 
 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
                                  struct msghdr *msg, size_t size, int flags)
 {
         int err = security_socket_recvmsg(sock, msg, size, flags);
 
         return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
 }
 
 int sock_recvmsg(struct socket *sock, struct msghdr *msg,
                  size_t size, int flags)
 {
         struct kiocb iocb;
         struct sock_iocb siocb;
         int ret;
 
         init_sync_kiocb(&iocb, NULL);
         iocb.private = &siocb;
         ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
         if (-EIOCBQUEUED == ret)
                 ret = wait_on_sync_kiocb(&iocb);
         return ret;
 }
 EXPORT_SYMBOL(sock_recvmsg);
 
 static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
                               size_t size, int flags)
 {
         struct kiocb iocb;
         struct sock_iocb siocb;
         int ret;
 
         init_sync_kiocb(&iocb, NULL);
         iocb.private = &siocb;
         ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
         if (-EIOCBQUEUED == ret)
                 ret = wait_on_sync_kiocb(&iocb);
         return ret;
 }
 
 /**
  * kernel_recvmsg - Receive a message from a socket (kernel space)
  * @sock:       The socket to receive the message from
  * @msg:        Received message
  * @vec:        Input s/g array for message data
  * @num:        Size of input s/g array
  * @size:       Number of bytes to read
  * @flags:      Message flags (MSG_DONTWAIT, etc...)
  *
  * On return the msg structure contains the scatter/gather array passed in the
  * vec argument. The array is modified so that it consists of the unfilled
  * portion of the original array.
  *
  * The returned value is the total number of bytes received, or an error.
  */
 int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
                    struct kvec *vec, size_t num, size_t size, int flags)
 {
         mm_segment_t oldfs = get_fs();
         int result;
 
         set_fs(KERNEL_DS);
         /*
          * the following is safe, since for compiler definitions of kvec and
          * iovec are identical, yielding the same in-core layout and alignment
          */
         msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
         result = sock_recvmsg(sock, msg, size, flags);
         set_fs(oldfs);
         return result;
 }
 EXPORT_SYMBOL(kernel_recvmsg);
 
 static void sock_aio_dtor(struct kiocb *iocb)
 {
         kfree(iocb->private);
 }
 
 static ssize_t sock_sendpage(struct file *file, struct page *page,
                              int offset, size_t size, loff_t *ppos, int more)
 {
         struct socket *sock;
         int flags;
 
         sock = file->private_data;
 
         flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
         /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
         flags |= more;
 
         return kernel_sendpage(sock, page, offset, size, flags);
 }
 
 static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
                                 struct pipe_inode_info *pipe, size_t len,
                                 unsigned int flags)
 {
         struct socket *sock = file->private_data;
 
         if (unlikely(!sock->ops->splice_read))
                 return -EINVAL;
 
         return sock->ops->splice_read(sock, ppos, pipe, len, flags);
 }
 
 static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
                                          struct sock_iocb *siocb)
 {
         if (!is_sync_kiocb(iocb)) {
                 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
                 if (!siocb)
                         return NULL;
                 iocb->ki_dtor = sock_aio_dtor;
         }
 
         siocb->kiocb = iocb;
         iocb->private = siocb;
         return siocb;
 }
 
 static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
                 struct file *file, const struct iovec *iov,
                 unsigned long nr_segs)
 {
         struct socket *sock = file->private_data;
         size_t size = 0;
         int i;
 
         for (i = 0; i < nr_segs; i++)
                 size += iov[i].iov_len;
 
         msg->msg_name = NULL;
         msg->msg_namelen = 0;
         msg->msg_control = NULL;
         msg->msg_controllen = 0;
         msg->msg_iov = (struct iovec *)iov;
         msg->msg_iovlen = nr_segs;
         msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
 
         return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
 }
 
 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
                                 unsigned long nr_segs, loff_t pos)
 {
         struct sock_iocb siocb, *x;
 
         if (pos != 0)
                 return -ESPIPE;
 
         if (iocb->ki_left == 0) /* Match SYS5 behaviour */
                 return 0;
 
 
         x = alloc_sock_iocb(iocb, &siocb);
         if (!x)
                 return -ENOMEM;
         return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
 }
 
 static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
                         struct file *file, const struct iovec *iov,
                         unsigned long nr_segs)
 {
         struct socket *sock = file->private_data;
         size_t size = 0;
         int i;
 
         for (i = 0; i < nr_segs; i++)
                 size += iov[i].iov_len;
 
         msg->msg_name = NULL;
         msg->msg_namelen = 0;
         msg->msg_control = NULL;
         msg->msg_controllen = 0;
         msg->msg_iov = (struct iovec *)iov;
         msg->msg_iovlen = nr_segs;
         msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
         if (sock->type == SOCK_SEQPACKET)
                 msg->msg_flags |= MSG_EOR;
 
         return __sock_sendmsg(iocb, sock, msg, size);
 }
 
 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
                           unsigned long nr_segs, loff_t pos)
 {
         struct sock_iocb siocb, *x;
 
         if (pos != 0)
                 return -ESPIPE;
 
         x = alloc_sock_iocb(iocb, &siocb);
         if (!x)
                 return -ENOMEM;
 
         return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
 }
 
 /*
  * Atomic setting of ioctl hooks to avoid race
  * with module unload.
  */
 
 static DEFINE_MUTEX(br_ioctl_mutex);
 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
 
 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
 {
         mutex_lock(&br_ioctl_mutex);
         br_ioctl_hook = hook;
         mutex_unlock(&br_ioctl_mutex);
 }
 EXPORT_SYMBOL(brioctl_set);
 
 static DEFINE_MUTEX(vlan_ioctl_mutex);
 static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
 
 void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
 {
         mutex_lock(&vlan_ioctl_mutex);
         vlan_ioctl_hook = hook;
         mutex_unlock(&vlan_ioctl_mutex);
 }
 EXPORT_SYMBOL(vlan_ioctl_set);
 
 static DEFINE_MUTEX(dlci_ioctl_mutex);
 static int (*dlci_ioctl_hook) (unsigned int, void __user *);
 
 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
 {
         mutex_lock(&dlci_ioctl_mutex);
         dlci_ioctl_hook = hook;
         mutex_unlock(&dlci_ioctl_mutex);
 }
 EXPORT_SYMBOL(dlci_ioctl_set);
 
 static long sock_do_ioctl(struct net *net, struct socket *sock,
                                  unsigned int cmd, unsigned long arg)
 {
         int err;
         void __user *argp = (void __user *)arg;
 
         err = sock->ops->ioctl(sock, cmd, arg);
 
         /*
          * If this ioctl is unknown try to hand it down
          * to the NIC driver.
          */
         if (err == -ENOIOCTLCMD)
                 err = dev_ioctl(net, cmd, argp);
 
         return err;
 }
 
 /*
  *      With an ioctl, arg may well be a user mode pointer, but we don't know
  *      what to do with it - that's up to the protocol still.
  */
 
 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 {
         struct socket *sock;
         struct sock *sk;
         void __user *argp = (void __user *)arg;
         int pid, err;
         struct net *net;
 
         sock = file->private_data;
         sk = sock->sk;
         net = sock_net(sk);
         if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
                 err = dev_ioctl(net, cmd, argp);
         } else
 #ifdef CONFIG_WEXT_CORE
         if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
                 err = dev_ioctl(net, cmd, argp);
         } else
 #endif
                 switch (cmd) {
                 case FIOSETOWN:
                 case SIOCSPGRP:
                         err = -EFAULT;
                         if (get_user(pid, (int __user *)argp))
                                 break;
                         err = f_setown(sock->file, pid, 1);
                         break;
                 case FIOGETOWN:
                 case SIOCGPGRP:
                         err = put_user(f_getown(sock->file),
                                        (int __user *)argp);
                         break;
                 case SIOCGIFBR:
                 case SIOCSIFBR:
                 case SIOCBRADDBR:
                 case SIOCBRDELBR:
                         err = -ENOPKG;
                         if (!br_ioctl_hook)
                                 request_module("bridge");
 
                         mutex_lock(&br_ioctl_mutex);
                         if (br_ioctl_hook)
                                 err = br_ioctl_hook(net, cmd, argp);
                         mutex_unlock(&br_ioctl_mutex);
                         break;
                 case SIOCGIFVLAN:
                 case SIOCSIFVLAN:
                         err = -ENOPKG;
                         if (!vlan_ioctl_hook)
                                 request_module("8021q");
 
                         mutex_lock(&vlan_ioctl_mutex);
                         if (vlan_ioctl_hook)
                                 err = vlan_ioctl_hook(net, argp);
                         mutex_unlock(&vlan_ioctl_mutex);
                         break;
                 case SIOCADDDLCI:
                 case SIOCDELDLCI:
                         err = -ENOPKG;
                         if (!dlci_ioctl_hook)
                                 request_module("dlci");
 
                         mutex_lock(&dlci_ioctl_mutex);
                         if (dlci_ioctl_hook)
                                 err = dlci_ioctl_hook(cmd, argp);
                         mutex_unlock(&dlci_ioctl_mutex);
                         break;
                 default:
                         err = sock_do_ioctl(net, sock, cmd, arg);
                         break;
                 }
         return err;
 }
 
 int sock_create_lite(int family, int type, int protocol, struct socket **res)
 {
         int err;
         struct socket *sock = NULL;
 
         err = security_socket_create(family, type, protocol, 1);
         if (err)
                 goto out;
 
         sock = sock_alloc();
         if (!sock) {
                 err = -ENOMEM;
                 goto out;
         }
 
         sock->type = type;
         err = security_socket_post_create(sock, family, type, protocol, 1);
         if (err)
                 goto out_release;
 
 out:
         *res = sock;
         return err;
 out_release:
         sock_release(sock);
         sock = NULL;
         goto out;
 }
 EXPORT_SYMBOL(sock_create_lite);
 
 /* No kernel lock held - perfect */
 static unsigned int sock_poll(struct file *file, poll_table *wait)
 {
         unsigned int busy_flag = 0;
         struct socket *sock;
 
         /*
          *      We can't return errors to poll, so it's either yes or no.
          */
         sock = file->private_data;
 
         if (sk_can_busy_loop(sock->sk)) {
                 /* this socket can poll_ll so tell the system call */
                 busy_flag = POLL_BUSY_LOOP;
 
                 /* once, only if requested by syscall */
                 if (wait && (wait->_key & POLL_BUSY_LOOP))
                         sk_busy_loop(sock->sk, 1);
         }
 
         return busy_flag | sock->ops->poll(file, sock, wait);
 }
 
 static int sock_mmap(struct file *file, struct vm_area_struct *vma)
 {
         struct socket *sock = file->private_data;
 
         return sock->ops->mmap(file, sock, vma);
 }
 
 static int sock_close(struct inode *inode, struct file *filp)
 {
         sock_release(SOCKET_I(inode));
         return 0;
 }
 
 /*
  *      Update the socket async list
  *
  *      Fasync_list locking strategy.
  *
  *      1. fasync_list is modified only under process context socket lock
  *         i.e. under semaphore.
  *      2. fasync_list is used under read_lock(&sk->sk_callback_lock)
  *         or under socket lock
  */
 
 static int sock_fasync(int fd, struct file *filp, int on)
 {
         struct socket *sock = filp->private_data;
         struct sock *sk = sock->sk;
         struct socket_wq *wq;
 
         if (sk == NULL)
                 return -EINVAL;
 
         lock_sock(sk);
         wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
         fasync_helper(fd, filp, on, &wq->fasync_list);
 
         if (!wq->fasync_list)
                 sock_reset_flag(sk, SOCK_FASYNC);
         else
                 sock_set_flag(sk, SOCK_FASYNC);
 
         release_sock(sk);
         return 0;
 }
 
 /* This function may be called only under socket lock or callback_lock or rcu_lock */
 
 int sock_wake_async(struct socket *sock, int how, int band)
 {
         struct socket_wq *wq;
 
         if (!sock)
                 return -1;
         rcu_read_lock();
         wq = rcu_dereference(sock->wq);
         if (!wq || !wq->fasync_list) {
                 rcu_read_unlock();
                 return -1;
         }
         switch (how) {
         case SOCK_WAKE_WAITD:
                 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
                         break;
                 goto call_kill;
         case SOCK_WAKE_SPACE:
                 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
                         break;
                 /* fall through */
         case SOCK_WAKE_IO:
 call_kill:
                 kill_fasync(&wq->fasync_list, SIGIO, band);
                 break;
         case SOCK_WAKE_URG:
                 kill_fasync(&wq->fasync_list, SIGURG, band);
         }
         rcu_read_unlock();
         return 0;
 }
 EXPORT_SYMBOL(sock_wake_async);
 
 int __sock_create(struct net *net, int family, int type, int protocol,
                          struct socket **res, int kern)
 {
         int err;
         struct socket *sock;
         const struct net_proto_family *pf;
 
         /*
          *      Check protocol is in range
          */
         if (family < 0 || family >= NPROTO)
                 return -EAFNOSUPPORT;
         if (type < 0 || type >= SOCK_MAX)
                 return -EINVAL;
 
         /* Compatibility.
 
            This uglymoron is moved from INET layer to here to avoid
            deadlock in module load.
          */
         if (family == PF_INET && type == SOCK_PACKET) {
                 static int warned;
                 if (!warned) {
                         warned = 1;
                         printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
                                current->comm);
                 }
                 family = PF_PACKET;
         }
 
         err = security_socket_create(family, type, protocol, kern);
         if (err)
                 return err;
 
         /*
          *      Allocate the socket and allow the family to set things up. if
          *      the protocol is 0, the family is instructed to select an appropriate
          *      default.
          */
         sock = sock_alloc();
         if (!sock) {
                 net_warn_ratelimited("socket: no more sockets\n");
                 return -ENFILE; /* Not exactly a match, but its the
                                    closest posix thing */
         }
 
         sock->type = type;
 
 #ifdef CONFIG_MODULES
         /* Attempt to load a protocol module if the find failed.
          *
          * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
          * requested real, full-featured networking support upon configuration.
          * Otherwise module support will break!
          */
         if (rcu_access_pointer(net_families[family]) == NULL)
                 request_module("net-pf-%d", family);
 #endif
 
         rcu_read_lock();
         pf = rcu_dereference(net_families[family]);
         err = -EAFNOSUPPORT;
         if (!pf)
                 goto out_release;
 
         /*
          * We will call the ->create function, that possibly is in a loadable
          * module, so we have to bump that loadable module refcnt first.
          */
         if (!try_module_get(pf->owner))
                 goto out_release;
 
         /* Now protected by module ref count */
         rcu_read_unlock();
 
         err = pf->create(net, sock, protocol, kern);
         if (err < 0)
                 goto out_module_put;
 
         /*
          * Now to bump the refcnt of the [loadable] module that owns this
          * socket at sock_release time we decrement its refcnt.
          */
         if (!try_module_get(sock->ops->owner))
                 goto out_module_busy;
 
         /*
          * Now that we're done with the ->create function, the [loadable]
          * module can have its refcnt decremented
          */
         module_put(pf->owner);
         err = security_socket_post_create(sock, family, type, protocol, kern);
         if (err)
                 goto out_sock_release;
         *res = sock;
 
         return 0;
 
 out_module_busy:
         err = -EAFNOSUPPORT;
 out_module_put:
         sock->ops = NULL;
         module_put(pf->owner);
 out_sock_release:
         sock_release(sock);
         return err;
 
 out_release:
         rcu_read_unlock();
         goto out_sock_release;
 }
 EXPORT_SYMBOL(__sock_create);
 
 int sock_create(int family, int type, int protocol, struct socket **res)
 {
         return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
 }
 EXPORT_SYMBOL(sock_create);
 
 int sock_create_kern(int family, int type, int protocol, struct socket **res)
 {
         return __sock_create(&init_net, family, type, protocol, res, 1);
 }
 EXPORT_SYMBOL(sock_create_kern);
 
 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
 {
         int retval;
         struct socket *sock;
         int flags;
 
         /* Check the SOCK_* constants for consistency.  */
         BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
         BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
         BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
         BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
 
         flags = type & ~SOCK_TYPE_MASK;
         if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
                 return -EINVAL;
         type &= SOCK_TYPE_MASK;
 
         if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
                 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
 
         retval = sock_create(family, type, protocol, &sock);
         if (retval < 0)
                 goto out;
 
         retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
         if (retval < 0)
                 goto out_release;
 
 out:
         /* It may be already another descriptor 8) Not kernel problem. */
         return retval;
 
 out_release:
         sock_release(sock);
         return retval;
 }
 
 /*
  *      Create a pair of connected sockets.
  */
 
 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
                 int __user *, usockvec)
 {
         struct socket *sock1, *sock2;
         int fd1, fd2, err;
         struct file *newfile1, *newfile2;
         int flags;
 
         flags = type & ~SOCK_TYPE_MASK;
         if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
                 return -EINVAL;
         type &= SOCK_TYPE_MASK;
 
         if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
                 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
 
         /*
          * Obtain the first socket and check if the underlying protocol
          * supports the socketpair call.
          */
 
         err = sock_create(family, type, protocol, &sock1);
         if (err < 0)
                 goto out;
 
         err = sock_create(family, type, protocol, &sock2);
         if (err < 0)
                 goto out_release_1;
 
         err = sock1->ops->socketpair(sock1, sock2);
         if (err < 0)
                 goto out_release_both;
 
         fd1 = get_unused_fd_flags(flags);
         if (unlikely(fd1 < 0)) {
                 err = fd1;
                 goto out_release_both;
         }
         fd2 = get_unused_fd_flags(flags);
         if (unlikely(fd2 < 0)) {
                 err = fd2;
                 put_unused_fd(fd1);
                 goto out_release_both;
         }
 
         newfile1 = sock_alloc_file(sock1, flags, NULL);
         if (unlikely(IS_ERR(newfile1))) {
                 err = PTR_ERR(newfile1);
                 put_unused_fd(fd1);
                 put_unused_fd(fd2);
                 goto out_release_both;
         }
 
         newfile2 = sock_alloc_file(sock2, flags, NULL);
         if (IS_ERR(newfile2)) {
                 err = PTR_ERR(newfile2);
                 fput(newfile1);
                 put_unused_fd(fd1);
                 put_unused_fd(fd2);
                 sock_release(sock2);
                 goto out;
         }
 
         audit_fd_pair(fd1, fd2);
         fd_install(fd1, newfile1);
         fd_install(fd2, newfile2);
         /* fd1 and fd2 may be already another descriptors.
          * Not kernel problem.
          */
 
         err = put_user(fd1, &usockvec[0]);
         if (!err)
                 err = put_user(fd2, &usockvec[1]);
         if (!err)
                 return 0;
 
         sys_close(fd2);
         sys_close(fd1);
         return err;
 
 out_release_both:
         sock_release(sock2);
 out_release_1:
         sock_release(sock1);
 out:
         return err;
 }
 
 /*
  *      Bind a name to a socket. Nothing much to do here since it's
  *      the protocol's responsibility to handle the local address.
  *
  *      We move the socket address to kernel space before we call
  *      the protocol layer (having also checked the address is ok).
  */
 
 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
 {
         struct socket *sock;
         struct sockaddr_storage address;
         int err, fput_needed;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (sock) {
                 err = move_addr_to_kernel(umyaddr, addrlen, &address);
                 if (err >= 0) {
                         err = security_socket_bind(sock,
                                                    (struct sockaddr *)&address,
                                                    addrlen);
                         if (!err)
                                 err = sock->ops->bind(sock,
                                                       (struct sockaddr *)
                                                       &address, addrlen);
                 }
                 fput_light(sock->file, fput_needed);
         }
         return err;
 }
 
 /*
  *      Perform a listen. Basically, we allow the protocol to do anything
  *      necessary for a listen, and if that works, we mark the socket as
  *      ready for listening.
  */
 
 SYSCALL_DEFINE2(listen, int, fd, int, backlog)
 {
         struct socket *sock;
         int err, fput_needed;
         int somaxconn;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (sock) {
                 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
                 if ((unsigned int)backlog > somaxconn)
                         backlog = somaxconn;
 
                 err = security_socket_listen(sock, backlog);
                 if (!err)
                         err = sock->ops->listen(sock, backlog);
 
                 fput_light(sock->file, fput_needed);
         }
         return err;
 }
 
 /*
  *      For accept, we attempt to create a new socket, set up the link
  *      with the client, wake up the client, then return the new
  *      connected fd. We collect the address of the connector in kernel
  *      space and move it to user at the very end. This is unclean because
  *      we open the socket then return an error.
  *
  *      1003.1g adds the ability to recvmsg() to query connection pending
  *      status to recvmsg. We need to add that support in a way thats
  *      clean when we restucture accept also.
  */
 
 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
                 int __user *, upeer_addrlen, int, flags)
 {
         struct socket *sock, *newsock;
         struct file *newfile;
         int err, len, newfd, fput_needed;
         struct sockaddr_storage address;
 
         if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
                 return -EINVAL;
 
         if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
                 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 goto out;
 
         err = -ENFILE;
         newsock = sock_alloc();
         if (!newsock)
                 goto out_put;
 
         newsock->type = sock->type;
         newsock->ops = sock->ops;
 
         /*
          * We don't need try_module_get here, as the listening socket (sock)
          * has the protocol module (sock->ops->owner) held.
          */
         __module_get(newsock->ops->owner);
 
         newfd = get_unused_fd_flags(flags);
         if (unlikely(newfd < 0)) {
                 err = newfd;
                 sock_release(newsock);
                 goto out_put;
         }
         newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
         if (unlikely(IS_ERR(newfile))) {
                 err = PTR_ERR(newfile);
                 put_unused_fd(newfd);
                 sock_release(newsock);
                 goto out_put;
         }
 
         err = security_socket_accept(sock, newsock);
         if (err)
                 goto out_fd;
 
         err = sock->ops->accept(sock, newsock, sock->file->f_flags);
         if (err < 0)
                 goto out_fd;
 
         if (ccs_socket_post_accept_permission(sock, newsock)) {
                 err = -EAGAIN; /* Hope less harmful than -EPERM. */
                 goto out_fd;
         }
         if (upeer_sockaddr) {
                 if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
                                           &len, 2) < 0) {
                         err = -ECONNABORTED;
                         goto out_fd;
                 }
                 err = move_addr_to_user(&address,
                                         len, upeer_sockaddr, upeer_addrlen);
                 if (err < 0)
                         goto out_fd;
         }
 
         /* File flags are not inherited via accept() unlike another OSes. */
 
         fd_install(newfd, newfile);
         err = newfd;
 
 out_put:
         fput_light(sock->file, fput_needed);
 out:
         return err;
 out_fd:
         fput(newfile);
         put_unused_fd(newfd);
         goto out_put;
 }
 
 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
                 int __user *, upeer_addrlen)
 {
         return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
 }
 
 /*
  *      Attempt to connect to a socket with the server address.  The address
  *      is in user space so we verify it is OK and move it to kernel space.
  *
  *      For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
  *      break bindings
  *
  *      NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
  *      other SEQPACKET protocols that take time to connect() as it doesn't
  *      include the -EINPROGRESS status for such sockets.
  */
 
 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
                 int, addrlen)
 {
         struct socket *sock;
         struct sockaddr_storage address;
         int err, fput_needed;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 goto out;
         err = move_addr_to_kernel(uservaddr, addrlen, &address);
         if (err < 0)
                 goto out_put;
 
         err =
             security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
         if (err)
                 goto out_put;
 
         err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
                                  sock->file->f_flags);
 out_put:
         fput_light(sock->file, fput_needed);
 out:
         return err;
 }
 
 /*
  *      Get the local address ('name') of a socket object. Move the obtained
  *      name to user space.
  */
 
 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
                 int __user *, usockaddr_len)
 {
         struct socket *sock;
         struct sockaddr_storage address;
         int len, err, fput_needed;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 goto out;
 
         err = security_socket_getsockname(sock);
         if (err)
                 goto out_put;
 
         err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
         if (err)
                 goto out_put;
         err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
 
 out_put:
         fput_light(sock->file, fput_needed);
 out:
         return err;
 }
 
 /*
  *      Get the remote address ('name') of a socket object. Move the obtained
  *      name to user space.
  */
 
 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
                 int __user *, usockaddr_len)
 {
         struct socket *sock;
         struct sockaddr_storage address;
         int len, err, fput_needed;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (sock != NULL) {
                 err = security_socket_getpeername(sock);
                 if (err) {
                         fput_light(sock->file, fput_needed);
                         return err;
                 }
 
                 err =
                     sock->ops->getname(sock, (struct sockaddr *)&address, &len,
                                        1);
                 if (!err)
                         err = move_addr_to_user(&address, len, usockaddr,
                                                 usockaddr_len);
                 fput_light(sock->file, fput_needed);
         }
         return err;
 }
 
 /*
  *      Send a datagram to a given address. We move the address into kernel
  *      space and check the user space data area is readable before invoking
  *      the protocol.
  */
 
 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
                 unsigned int, flags, struct sockaddr __user *, addr,
                 int, addr_len)
 {
         struct socket *sock;
         struct sockaddr_storage address;
         int err;
         struct msghdr msg;
         struct iovec iov;
         int fput_needed;
 
         if (len > INT_MAX)
                 len = INT_MAX;
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 goto out;
 
         iov.iov_base = buff;
         iov.iov_len = len;
         msg.msg_name = NULL;
         msg.msg_iov = &iov;
         msg.msg_iovlen = 1;
         msg.msg_control = NULL;
         msg.msg_controllen = 0;
         msg.msg_namelen = 0;
         if (addr) {
                 err = move_addr_to_kernel(addr, addr_len, &address);
                 if (err < 0)
                         goto out_put;
                 msg.msg_name = (struct sockaddr *)&address;
                 msg.msg_namelen = addr_len;
         }
         if (sock->file->f_flags & O_NONBLOCK)
                 flags |= MSG_DONTWAIT;
         msg.msg_flags = flags;
         err = sock_sendmsg(sock, &msg, len);
 
 out_put:
         fput_light(sock->file, fput_needed);
 out:
         return err;
 }
 
 /*
  *      Send a datagram down a socket.
  */
 
 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
                 unsigned int, flags)
 {
         return sys_sendto(fd, buff, len, flags, NULL, 0);
 }
 
 /*
  *      Receive a frame from the socket and optionally record the address of the
  *      sender. We verify the buffers are writable and if needed move the
  *      sender address from kernel to user space.
  */
 
 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
                 unsigned int, flags, struct sockaddr __user *, addr,
                 int __user *, addr_len)
 {
         struct socket *sock;
         struct iovec iov;
         struct msghdr msg;
         struct sockaddr_storage address;
         int err, err2;
         int fput_needed;
 
         if (size > INT_MAX)
                 size = INT_MAX;
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 goto out;
 
         msg.msg_control = NULL;
         msg.msg_controllen = 0;
         msg.msg_iovlen = 1;
         msg.msg_iov = &iov;
         iov.iov_len = size;
         iov.iov_base = ubuf;
         msg.msg_name = (struct sockaddr *)&address;
         msg.msg_namelen = sizeof(address);
         if (sock->file->f_flags & O_NONBLOCK)
                 flags |= MSG_DONTWAIT;
         err = sock_recvmsg(sock, &msg, size, flags);
 
         if (err >= 0 && addr != NULL) {
                 err2 = move_addr_to_user(&address,
                                          msg.msg_namelen, addr, addr_len);
                 if (err2 < 0)
                         err = err2;
         }
 
         fput_light(sock->file, fput_needed);
 out:
         return err;
 }
 
 /*
  *      Receive a datagram from a socket.
  */
 
 asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
                          unsigned int flags)
 {
         return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
 }
 
 /*
  *      Set a socket option. Because we don't know the option lengths we have
  *      to pass the user mode parameter for the protocols to sort out.
  */
 
 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
                 char __user *, optval, int, optlen)
 {
         int err, fput_needed;
         struct socket *sock;
 
         if (optlen < 0)
                 return -EINVAL;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (sock != NULL) {
                 err = security_socket_setsockopt(sock, level, optname);
                 if (err)
                         goto out_put;
 
                 if (level == SOL_SOCKET)
                         err =
                             sock_setsockopt(sock, level, optname, optval,
                                             optlen);
                 else
                         err =
                             sock->ops->setsockopt(sock, level, optname, optval,
                                                   optlen);
 out_put:
                 fput_light(sock->file, fput_needed);
         }
         return err;
 }
 
 /*
  *      Get a socket option. Because we don't know the option lengths we have
  *      to pass a user mode parameter for the protocols to sort out.
  */
 
 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
                 char __user *, optval, int __user *, optlen)
 {
         int err, fput_needed;
         struct socket *sock;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (sock != NULL) {
                 err = security_socket_getsockopt(sock, level, optname);
                 if (err)
                         goto out_put;
 
                 if (level == SOL_SOCKET)
                         err =
                             sock_getsockopt(sock, level, optname, optval,
                                             optlen);
                 else
                         err =
                             sock->ops->getsockopt(sock, level, optname, optval,
                                                   optlen);
 out_put:
                 fput_light(sock->file, fput_needed);
         }
         return err;
 }
 
 /*
  *      Shutdown a socket.
  */
 
 SYSCALL_DEFINE2(shutdown, int, fd, int, how)
 {
         int err, fput_needed;
         struct socket *sock;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (sock != NULL) {
                 err = security_socket_shutdown(sock, how);
                 if (!err)
                         err = sock->ops->shutdown(sock, how);
                 fput_light(sock->file, fput_needed);
         }
         return err;
 }
 
 /* A couple of helpful macros for getting the address of the 32/64 bit
  * fields which are the same type (int / unsigned) on our platforms.
  */
 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
 #define COMPAT_NAMELEN(msg)     COMPAT_MSG(msg, msg_namelen)
 #define COMPAT_FLAGS(msg)       COMPAT_MSG(msg, msg_flags)
 
 struct used_address {
         struct sockaddr_storage name;
         unsigned int name_len;
 };
 
 static int copy_msghdr_from_user(struct msghdr *kmsg,
                                  struct msghdr __user *umsg)
 {
         if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
                 return -EFAULT;
         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
                 return -EINVAL;
         return 0;
 }
 
 static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
                          struct msghdr *msg_sys, unsigned int flags,
                          struct used_address *used_address)
 {
         struct compat_msghdr __user *msg_compat =
             (struct compat_msghdr __user *)msg;
         struct sockaddr_storage address;
         struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
         unsigned char ctl[sizeof(struct cmsghdr) + 20]
             __attribute__ ((aligned(sizeof(__kernel_size_t))));
         /* 20 is size of ipv6_pktinfo */
         unsigned char *ctl_buf = ctl;
         int err, ctl_len, total_len;
 
         err = -EFAULT;
         if (MSG_CMSG_COMPAT & flags) {
                 if (get_compat_msghdr(msg_sys, msg_compat))
                         return -EFAULT;
         } else {
                 err = copy_msghdr_from_user(msg_sys, msg);
                 if (err)
                         return err;
         }
 
         if (msg_sys->msg_iovlen > UIO_FASTIOV) {
                 err = -EMSGSIZE;
                 if (msg_sys->msg_iovlen > UIO_MAXIOV)
                         goto out;
                 err = -ENOMEM;
                 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
                               GFP_KERNEL);
                 if (!iov)
                         goto out;
         }
 
         /* This will also move the address data into kernel space */
         if (MSG_CMSG_COMPAT & flags) {
                 err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
         } else
                 err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
         if (err < 0)
                 goto out_freeiov;
         total_len = err;
 
         err = -ENOBUFS;
 
         if (msg_sys->msg_controllen > INT_MAX)
                 goto out_freeiov;
         ctl_len = msg_sys->msg_controllen;
         if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
                 err =
                     cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
                                                      sizeof(ctl));
                 if (err)
                         goto out_freeiov;
                 ctl_buf = msg_sys->msg_control;
                 ctl_len = msg_sys->msg_controllen;
         } else if (ctl_len) {
                 if (ctl_len > sizeof(ctl)) {
                         ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
                         if (ctl_buf == NULL)
                                 goto out_freeiov;
                 }
                 err = -EFAULT;
                 /*
                  * Careful! Before this, msg_sys->msg_control contains a user pointer.
                  * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
                  * checking falls down on this.
                  */
                 if (copy_from_user(ctl_buf,
                                    (void __user __force *)msg_sys->msg_control,
                                    ctl_len))
                         goto out_freectl;
                 msg_sys->msg_control = ctl_buf;
         }
         msg_sys->msg_flags = flags;
 
         if (sock->file->f_flags & O_NONBLOCK)
                 msg_sys->msg_flags |= MSG_DONTWAIT;
         /*
          * If this is sendmmsg() and current destination address is same as
          * previously succeeded address, omit asking LSM's decision.
          * used_address->name_len is initialized to UINT_MAX so that the first
          * destination address never matches.
          */
         if (used_address && msg_sys->msg_name &&
             used_address->name_len == msg_sys->msg_namelen &&
             !memcmp(&used_address->name, msg_sys->msg_name,
                     used_address->name_len)) {
                 err = sock_sendmsg_nosec(sock, msg_sys, total_len);
                 goto out_freectl;
         }
         err = sock_sendmsg(sock, msg_sys, total_len);
         /*
          * If this is sendmmsg() and sending to current destination address was
          * successful, remember it.
          */
         if (used_address && err >= 0) {
                 used_address->name_len = msg_sys->msg_namelen;
                 if (msg_sys->msg_name)
                         memcpy(&used_address->name, msg_sys->msg_name,
                                used_address->name_len);
         }
 
 out_freectl:
         if (ctl_buf != ctl)
                 sock_kfree_s(sock->sk, ctl_buf, ctl_len);
 out_freeiov:
         if (iov != iovstack)
                 kfree(iov);
 out:
         return err;
 }
 
 /*
  *      BSD sendmsg interface
  */
 
 long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
 {
         int fput_needed, err;
         struct msghdr msg_sys;
         struct socket *sock;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 goto out;
 
         err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
 
         fput_light(sock->file, fput_needed);
 out:
         return err;
 }
 
 SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
 {
         if (flags & MSG_CMSG_COMPAT)
                 return -EINVAL;
         return __sys_sendmsg(fd, msg, flags);
 }
 
 /*
  *      Linux sendmmsg interface
  */
 
 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
                    unsigned int flags)
 {
         int fput_needed, err, datagrams;
         struct socket *sock;
         struct mmsghdr __user *entry;
         struct compat_mmsghdr __user *compat_entry;
         struct msghdr msg_sys;
         struct used_address used_address;
 
         if (vlen > UIO_MAXIOV)
                 vlen = UIO_MAXIOV;
 
         datagrams = 0;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 return err;
 
         used_address.name_len = UINT_MAX;
         entry = mmsg;
         compat_entry = (struct compat_mmsghdr __user *)mmsg;
         err = 0;
 
         while (datagrams < vlen) {
                 if (MSG_CMSG_COMPAT & flags) {
                         err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
                                              &msg_sys, flags, &used_address);
                         if (err < 0)
                                 break;
                         err = __put_user(err, &compat_entry->msg_len);
                         ++compat_entry;
                 } else {
                         err = ___sys_sendmsg(sock,
                                              (struct msghdr __user *)entry,
                                              &msg_sys, flags, &used_address);
                         if (err < 0)
                                 break;
                         err = put_user(err, &entry->msg_len);
                         ++entry;
                 }
 
                 if (err)
                         break;
                 ++datagrams;
         }
 
         fput_light(sock->file, fput_needed);
 
         /* We only return an error if no datagrams were able to be sent */
         if (datagrams != 0)
                 return datagrams;
 
         return err;
 }
 
 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
                 unsigned int, vlen, unsigned int, flags)
 {
         if (flags & MSG_CMSG_COMPAT)
                 return -EINVAL;
         return __sys_sendmmsg(fd, mmsg, vlen, flags);
 }
 
 static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
                          struct msghdr *msg_sys, unsigned int flags, int nosec)
 {
         struct compat_msghdr __user *msg_compat =
             (struct compat_msghdr __user *)msg;
         struct iovec iovstack[UIO_FASTIOV];
         struct iovec *iov = iovstack;
         unsigned long cmsg_ptr;
         int err, total_len, len;
 
         /* kernel mode address */
         struct sockaddr_storage addr;
 
         /* user mode address pointers */
         struct sockaddr __user *uaddr;
         int __user *uaddr_len;
 
         if (MSG_CMSG_COMPAT & flags) {
                 if (get_compat_msghdr(msg_sys, msg_compat))
                         return -EFAULT;
         } else {
                 err = copy_msghdr_from_user(msg_sys, msg);
                 if (err)
                         return err;
         }
 
         if (msg_sys->msg_iovlen > UIO_FASTIOV) {
                 err = -EMSGSIZE;
                 if (msg_sys->msg_iovlen > UIO_MAXIOV)
                         goto out;
                 err = -ENOMEM;
                 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
                               GFP_KERNEL);
                 if (!iov)
                         goto out;
         }
 
         /*
          *      Save the user-mode address (verify_iovec will change the
          *      kernel msghdr to use the kernel address space)
          */
 
         uaddr = (__force void __user *)msg_sys->msg_name;
         uaddr_len = COMPAT_NAMELEN(msg);
         if (MSG_CMSG_COMPAT & flags) {
                 err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
         } else
                 err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
         if (err < 0)
                 goto out_freeiov;
         total_len = err;
 
         cmsg_ptr = (unsigned long)msg_sys->msg_control;
         msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
 
         if (sock->file->f_flags & O_NONBLOCK)
                 flags |= MSG_DONTWAIT;
         err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
                                                           total_len, flags);
         if (err < 0)
                 goto out_freeiov;
         len = err;
 
         if (uaddr != NULL) {
                 err = move_addr_to_user(&addr,
                                         msg_sys->msg_namelen, uaddr,
                                         uaddr_len);
                 if (err < 0)
                         goto out_freeiov;
         }
         err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
                          COMPAT_FLAGS(msg));
         if (err)
                 goto out_freeiov;
         if (MSG_CMSG_COMPAT & flags)
                 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
                                  &msg_compat->msg_controllen);
         else
                 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
                                  &msg->msg_controllen);
         if (err)
                 goto out_freeiov;
         err = len;
 
 out_freeiov:
         if (iov != iovstack)
                 kfree(iov);
 out:
         return err;
 }
 
 /*
  *      BSD recvmsg interface
  */
 
 long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
 {
         int fput_needed, err;
         struct msghdr msg_sys;
         struct socket *sock;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 goto out;
 
         err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
 
         fput_light(sock->file, fput_needed);
 out:
         return err;
 }
 
 SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
                 unsigned int, flags)
 {
         if (flags & MSG_CMSG_COMPAT)
                 return -EINVAL;
         return __sys_recvmsg(fd, msg, flags);
 }
 
 /*
  *     Linux recvmmsg interface
  */
 
 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
                    unsigned int flags, struct timespec *timeout)
 {
         int fput_needed, err, datagrams;
         struct socket *sock;
         struct mmsghdr __user *entry;
         struct compat_mmsghdr __user *compat_entry;
         struct msghdr msg_sys;
         struct timespec end_time;
 
         if (timeout &&
             poll_select_set_timeout(&end_time, timeout->tv_sec,
                                     timeout->tv_nsec))
                 return -EINVAL;
 
         datagrams = 0;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 return err;
 
         err = sock_error(sock->sk);
         if (err)
                 goto out_put;
 
         entry = mmsg;
         compat_entry = (struct compat_mmsghdr __user *)mmsg;
 
         while (datagrams < vlen) {
                 /*
                  * No need to ask LSM for more than the first datagram.
                  */
                 if (MSG_CMSG_COMPAT & flags) {
                         err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
                                              &msg_sys, flags & ~MSG_WAITFORONE,
                                              datagrams);
                         if (err < 0)
                                 break;
                         err = __put_user(err, &compat_entry->msg_len);
                         ++compat_entry;
                 } else {
                         err = ___sys_recvmsg(sock,
                                              (struct msghdr __user *)entry,
                                              &msg_sys, flags & ~MSG_WAITFORONE,
                                              datagrams);
                         if (err < 0)
                                 break;
                         err = put_user(err, &entry->msg_len);
                         ++entry;
                 }
 
                 if (err)
                         break;
                 ++datagrams;
 
                 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
                 if (flags & MSG_WAITFORONE)
                         flags |= MSG_DONTWAIT;
 
                 if (timeout) {
                         ktime_get_ts(timeout);
                         *timeout = timespec_sub(end_time, *timeout);
                         if (timeout->tv_sec < 0) {
                                 timeout->tv_sec = timeout->tv_nsec = 0;
                                 break;
                         }
 
                         /* Timeout, return less than vlen datagrams */
                         if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
                                 break;
                 }
 
                 /* Out of band data, return right away */
                 if (msg_sys.msg_flags & MSG_OOB)
                         break;
         }
 
 out_put:
         fput_light(sock->file, fput_needed);
 
         if (err == 0)
                 return datagrams;
 
         if (datagrams != 0) {
                 /*
                  * We may return less entries than requested (vlen) if the
                  * sock is non block and there aren't enough datagrams...
                  */
                 if (err != -EAGAIN) {
                         /*
                          * ... or  if recvmsg returns an error after we
                          * received some datagrams, where we record the
                          * error to return on the next call or if the
                          * app asks about it using getsockopt(SO_ERROR).
                          */
                         sock->sk->sk_err = -err;
                 }
 
                 return datagrams;
         }
 
         return err;
 }
 
 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
                 unsigned int, vlen, unsigned int, flags,
                 struct timespec __user *, timeout)
 {
         int datagrams;
         struct timespec timeout_sys;
 
         if (flags & MSG_CMSG_COMPAT)
                 return -EINVAL;
 
         if (!timeout)
                 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
 
         if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
                 return -EFAULT;
 
         datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
 
         if (datagrams > 0 &&
             copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
                 datagrams = -EFAULT;
 
         return datagrams;
 }
 
 #ifdef __ARCH_WANT_SYS_SOCKETCALL
 /* Argument list sizes for sys_socketcall */
 #define AL(x) ((x) * sizeof(unsigned long))
 static const unsigned char nargs[21] = {
         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
         AL(4), AL(5), AL(4)
 };
 
 #undef AL
 
 /*
  *      System call vectors.
  *
  *      Argument checking cleaned up. Saved 20% in size.
  *  This function doesn't need to set the kernel lock because
  *  it is set by the callees.
  */
 
 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
 {
         unsigned long a[AUDITSC_ARGS];
         unsigned long a0, a1;
         int err;
         unsigned int len;
 
         if (call < 1 || call > SYS_SENDMMSG)
                 return -EINVAL;
 
         len = nargs[call];
         if (len > sizeof(a))
                 return -EINVAL;
 
         /* copy_from_user should be SMP safe. */
         if (copy_from_user(a, args, len))
                 return -EFAULT;
 
         err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
         if (err)
                 return err;
 
         a0 = a[0];
         a1 = a[1];
 
         switch (call) {
         case SYS_SOCKET:
                 err = sys_socket(a0, a1, a[2]);
                 break;
         case SYS_BIND:
                 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
                 break;
         case SYS_CONNECT:
                 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
                 break;
         case SYS_LISTEN:
                 err = sys_listen(a0, a1);
                 break;
         case SYS_ACCEPT:
                 err = sys_accept4(a0, (struct sockaddr __user *)a1,
                                   (int __user *)a[2], 0);
                 break;
         case SYS_GETSOCKNAME:
                 err =
                     sys_getsockname(a0, (struct sockaddr __user *)a1,
                                     (int __user *)a[2]);
                 break;
         case SYS_GETPEERNAME:
                 err =
                     sys_getpeername(a0, (struct sockaddr __user *)a1,
                                     (int __user *)a[2]);
                 break;
         case SYS_SOCKETPAIR:
                 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
                 break;
         case SYS_SEND:
                 err = sys_send(a0, (void __user *)a1, a[2], a[3]);
                 break;
         case SYS_SENDTO:
                 err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
                                  (struct sockaddr __user *)a[4], a[5]);
                 break;
         case SYS_RECV:
                 err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
                 break;
         case SYS_RECVFROM:
                 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
                                    (struct sockaddr __user *)a[4],
                                    (int __user *)a[5]);
                 break;
         case SYS_SHUTDOWN:
                 err = sys_shutdown(a0, a1);
                 break;
         case SYS_SETSOCKOPT:
                 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
                 break;
         case SYS_GETSOCKOPT:
                 err =
                     sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
                                    (int __user *)a[4]);
                 break;
         case SYS_SENDMSG:
                 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
                 break;
         case SYS_SENDMMSG:
                 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
                 break;
         case SYS_RECVMSG:
                 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
                 break;
         case SYS_RECVMMSG:
                 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
                                    (struct timespec __user *)a[4]);
                 break;
         case SYS_ACCEPT4:
                 err = sys_accept4(a0, (struct sockaddr __user *)a1,
                                   (int __user *)a[2], a[3]);
                 break;
         default:
                 err = -EINVAL;
                 break;
         }
         return err;
 }
 
 #endif                          /* __ARCH_WANT_SYS_SOCKETCALL */
 
 /**
  *      sock_register - add a socket protocol handler
  *      @ops: description of protocol
  *
  *      This function is called by a protocol handler that wants to
  *      advertise its address family, and have it linked into the
  *      socket interface. The value ops->family coresponds to the
  *      socket system call protocol family.
  */
 int sock_register(const struct net_proto_family *ops)
 {
         int err;
 
         if (ops->family >= NPROTO) {
                 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
                        NPROTO);
                 return -ENOBUFS;
         }
 
         spin_lock(&net_family_lock);
         if (rcu_dereference_protected(net_families[ops->family],
                                       lockdep_is_held(&net_family_lock)))
                 err = -EEXIST;
         else {
                 rcu_assign_pointer(net_families[ops->family], ops);
                 err = 0;
         }
         spin_unlock(&net_family_lock);
 
         printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
         return err;
 }
 EXPORT_SYMBOL(sock_register);
 
 /**
  *      sock_unregister - remove a protocol handler
  *      @family: protocol family to remove
  *
  *      This function is called by a protocol handler that wants to
  *      remove its address family, and have it unlinked from the
  *      new socket creation.
  *
  *      If protocol handler is a module, then it can use module reference
  *      counts to protect against new references. If protocol handler is not
  *      a module then it needs to provide its own protection in
  *      the ops->create routine.
  */
 void sock_unregister(int family)
 {
         BUG_ON(family < 0 || family >= NPROTO);
 
         spin_lock(&net_family_lock);
         RCU_INIT_POINTER(net_families[family], NULL);
         spin_unlock(&net_family_lock);
 
         synchronize_rcu();
 
         printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
 }
 EXPORT_SYMBOL(sock_unregister);
 
 static int __init sock_init(void)
 {
         int err;
         /*
          *      Initialize the network sysctl infrastructure.
          */
         err = net_sysctl_init();
         if (err)
                 goto out;
 
         /*
          *      Initialize skbuff SLAB cache
          */
         skb_init();
 
         /*
          *      Initialize the protocols module.
          */
 
         init_inodecache();
 
         err = register_filesystem(&sock_fs_type);
         if (err)
                 goto out_fs;
         sock_mnt = kern_mount(&sock_fs_type);
         if (IS_ERR(sock_mnt)) {
                 err = PTR_ERR(sock_mnt);
                 goto out_mount;
         }
 
         /* The real protocol initialization is performed in later initcalls.
          */
 
 #ifdef CONFIG_NETFILTER
         err = netfilter_init();
         if (err)
                 goto out;
 #endif
 
 #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
         skb_timestamping_init();
 #endif
 
 out:
         return err;
 
 out_mount:
         unregister_filesystem(&sock_fs_type);
 out_fs:
         goto out;
 }
 
 core_initcall(sock_init);       /* early initcall */
 
 #ifdef CONFIG_PROC_FS
 void socket_seq_show(struct seq_file *seq)
 {
         int cpu;
         int counter = 0;
 
         for_each_possible_cpu(cpu)
             counter += per_cpu(sockets_in_use, cpu);
 
         /* It can be negative, by the way. 8) */
         if (counter < 0)
                 counter = 0;
 
         seq_printf(seq, "sockets: used %d\n", counter);
 }
 #endif                          /* CONFIG_PROC_FS */
 
 #ifdef CONFIG_COMPAT
 static int do_siocgstamp(struct net *net, struct socket *sock,
                          unsigned int cmd, void __user *up)
 {
         mm_segment_t old_fs = get_fs();
         struct timeval ktv;
         int err;
 
         set_fs(KERNEL_DS);
         err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
         set_fs(old_fs);
         if (!err)
                 err = compat_put_timeval(&ktv, up);
 
         return err;
 }
 
 static int do_siocgstampns(struct net *net, struct socket *sock,
                            unsigned int cmd, void __user *up)
 {
         mm_segment_t old_fs = get_fs();
         struct timespec kts;
         int err;
 
         set_fs(KERNEL_DS);
         err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
         set_fs(old_fs);
         if (!err)
                 err = compat_put_timespec(&kts, up);
 
         return err;
 }
 
 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
 {
         struct ifreq __user *uifr;
         int err;
 
         uifr = compat_alloc_user_space(sizeof(struct ifreq));
         if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
                 return -EFAULT;
 
         err = dev_ioctl(net, SIOCGIFNAME, uifr);
         if (err)
                 return err;
 
         if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
                 return -EFAULT;
 
         return 0;
 }
 
 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
 {
         struct compat_ifconf ifc32;
         struct ifconf ifc;
         struct ifconf __user *uifc;
         struct compat_ifreq __user *ifr32;
         struct ifreq __user *ifr;
         unsigned int i, j;
         int err;
 
         if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
                 return -EFAULT;
 
         memset(&ifc, 0, sizeof(ifc));
         if (ifc32.ifcbuf == 0) {
                 ifc32.ifc_len = 0;
                 ifc.ifc_len = 0;
                 ifc.ifc_req = NULL;
                 uifc = compat_alloc_user_space(sizeof(struct ifconf));
         } else {
                 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
                         sizeof(struct ifreq);
                 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
                 ifc.ifc_len = len;
                 ifr = ifc.ifc_req = (void __user *)(uifc + 1);
                 ifr32 = compat_ptr(ifc32.ifcbuf);
                 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
                         if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
                                 return -EFAULT;
                         ifr++;
                         ifr32++;
                 }
         }
         if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
                 return -EFAULT;
 
         err = dev_ioctl(net, SIOCGIFCONF, uifc);
         if (err)
                 return err;
 
         if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
                 return -EFAULT;
 
         ifr = ifc.ifc_req;
         ifr32 = compat_ptr(ifc32.ifcbuf);
         for (i = 0, j = 0;
              i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
              i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
                 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
                         return -EFAULT;
                 ifr32++;
                 ifr++;
         }
 
         if (ifc32.ifcbuf == 0) {
                 /* Translate from 64-bit structure multiple to
                  * a 32-bit one.
                  */
                 i = ifc.ifc_len;
                 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
                 ifc32.ifc_len = i;
         } else {
                 ifc32.ifc_len = i;
         }
         if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
                 return -EFAULT;
 
         return 0;
 }
 
 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
 {
         struct compat_ethtool_rxnfc __user *compat_rxnfc;
         bool convert_in = false, convert_out = false;
         size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
         struct ethtool_rxnfc __user *rxnfc;
         struct ifreq __user *ifr;
         u32 rule_cnt = 0, actual_rule_cnt;
         u32 ethcmd;
         u32 data;
         int ret;
 
         if (get_user(data, &ifr32->ifr_ifru.ifru_data))
                 return -EFAULT;
 
         compat_rxnfc = compat_ptr(data);
 
         if (get_user(ethcmd, &compat_rxnfc->cmd))
                 return -EFAULT;
 
         /* Most ethtool structures are defined without padding.
          * Unfortunately struct ethtool_rxnfc is an exception.
          */
         switch (ethcmd) {
         default:
                 break;
         case ETHTOOL_GRXCLSRLALL:
                 /* Buffer size is variable */
                 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
                         return -EFAULT;
                 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
                         return -ENOMEM;
                 buf_size += rule_cnt * sizeof(u32);
                 /* fall through */
         case ETHTOOL_GRXRINGS:
         case ETHTOOL_GRXCLSRLCNT:
         case ETHTOOL_GRXCLSRULE:
         case ETHTOOL_SRXCLSRLINS:
                 convert_out = true;
                 /* fall through */
         case ETHTOOL_SRXCLSRLDEL:
                 buf_size += sizeof(struct ethtool_rxnfc);
                 convert_in = true;
                 break;
         }
 
         ifr = compat_alloc_user_space(buf_size);
         rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8);
 
         if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
                 return -EFAULT;
 
         if (put_user(convert_in ? rxnfc : compat_ptr(data),
                      &ifr->ifr_ifru.ifru_data))
                 return -EFAULT;
 
         if (convert_in) {
                 /* We expect there to be holes between fs.m_ext and
                  * fs.ring_cookie and at the end of fs, but nowhere else.
                  */
                 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
                              sizeof(compat_rxnfc->fs.m_ext) !=
                              offsetof(struct ethtool_rxnfc, fs.m_ext) +
                              sizeof(rxnfc->fs.m_ext));
                 BUILD_BUG_ON(
                         offsetof(struct compat_ethtool_rxnfc, fs.location) -
                         offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
                         offsetof(struct ethtool_rxnfc, fs.location) -
                         offsetof(struct ethtool_rxnfc, fs.ring_cookie));
 
                 if (copy_in_user(rxnfc, compat_rxnfc,
                                  (void __user *)(&rxnfc->fs.m_ext + 1) -
                                  (void __user *)rxnfc) ||
                     copy_in_user(&rxnfc->fs.ring_cookie,
                                  &compat_rxnfc->fs.ring_cookie,
                                  (void __user *)(&rxnfc->fs.location + 1) -
                                  (void __user *)&rxnfc->fs.ring_cookie) ||
                     copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
                                  sizeof(rxnfc->rule_cnt)))
                         return -EFAULT;
         }
 
         ret = dev_ioctl(net, SIOCETHTOOL, ifr);
         if (ret)
                 return ret;
 
         if (convert_out) {
                 if (copy_in_user(compat_rxnfc, rxnfc,
                                  (const void __user *)(&rxnfc->fs.m_ext + 1) -
                                  (const void __user *)rxnfc) ||
                     copy_in_user(&compat_rxnfc->fs.ring_cookie,
                                  &rxnfc->fs.ring_cookie,
                                  (const void __user *)(&rxnfc->fs.location + 1) -
                                  (const void __user *)&rxnfc->fs.ring_cookie) ||
                     copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
                                  sizeof(rxnfc->rule_cnt)))
                         return -EFAULT;
 
                 if (ethcmd == ETHTOOL_GRXCLSRLALL) {
                         /* As an optimisation, we only copy the actual
                          * number of rules that the underlying
                          * function returned.  Since Mallory might
                          * change the rule count in user memory, we
                          * check that it is less than the rule count
                          * originally given (as the user buffer size),
                          * which has been range-checked.
                          */
                         if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
                                 return -EFAULT;
                         if (actual_rule_cnt < rule_cnt)
                                 rule_cnt = actual_rule_cnt;
                         if (copy_in_user(&compat_rxnfc->rule_locs[0],
                                          &rxnfc->rule_locs[0],
                                          rule_cnt * sizeof(u32)))
                                 return -EFAULT;
                 }
         }
 
         return 0;
 }
 
 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
 {
         void __user *uptr;
         compat_uptr_t uptr32;
         struct ifreq __user *uifr;
 
         uifr = compat_alloc_user_space(sizeof(*uifr));
         if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
                 return -EFAULT;
 
         if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
                 return -EFAULT;
 
         uptr = compat_ptr(uptr32);
 
         if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
                 return -EFAULT;
 
         return dev_ioctl(net, SIOCWANDEV, uifr);
 }
 
 static int bond_ioctl(struct net *net, unsigned int cmd,
                          struct compat_ifreq __user *ifr32)
 {
         struct ifreq kifr;
         struct ifreq __user *uifr;
         mm_segment_t old_fs;
         int err;
         u32 data;
         void __user *datap;
 
         switch (cmd) {
         case SIOCBONDENSLAVE:
         case SIOCBONDRELEASE:
         case SIOCBONDSETHWADDR:
         case SIOCBONDCHANGEACTIVE:
                 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
                         return -EFAULT;
 
                 old_fs = get_fs();
                 set_fs(KERNEL_DS);
                 err = dev_ioctl(net, cmd,
                                 (struct ifreq __user __force *) &kifr);
                 set_fs(old_fs);
 
                 return err;
         case SIOCBONDSLAVEINFOQUERY:
         case SIOCBONDINFOQUERY:
                 uifr = compat_alloc_user_space(sizeof(*uifr));
                 if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
                         return -EFAULT;
 
                 if (get_user(data, &ifr32->ifr_ifru.ifru_data))
                         return -EFAULT;
 
                 datap = compat_ptr(data);
                 if (put_user(datap, &uifr->ifr_ifru.ifru_data))
                         return -EFAULT;
 
                 return dev_ioctl(net, cmd, uifr);
         default:
                 return -ENOIOCTLCMD;
         }
 }
 
 static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
                                  struct compat_ifreq __user *u_ifreq32)
 {
         struct ifreq __user *u_ifreq64;
         char tmp_buf[IFNAMSIZ];
         void __user *data64;
         u32 data32;
 
         if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
                            IFNAMSIZ))
                 return -EFAULT;
         if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
                 return -EFAULT;
         data64 = compat_ptr(data32);
 
         u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
 
         /* Don't check these user accesses, just let that get trapped
          * in the ioctl handler instead.
          */
         if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
                          IFNAMSIZ))
                 return -EFAULT;
         if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
                 return -EFAULT;
 
         return dev_ioctl(net, cmd, u_ifreq64);
 }
 
 static int dev_ifsioc(struct net *net, struct socket *sock,
                          unsigned int cmd, struct compat_ifreq __user *uifr32)
 {
         struct ifreq __user *uifr;
         int err;
 
         uifr = compat_alloc_user_space(sizeof(*uifr));
         if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
                 return -EFAULT;
 
         err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
 
         if (!err) {
                 switch (cmd) {
                 case SIOCGIFFLAGS:
                 case SIOCGIFMETRIC:
                 case SIOCGIFMTU:
                 case SIOCGIFMEM:
                 case SIOCGIFHWADDR:
                 case SIOCGIFINDEX:
                 case SIOCGIFADDR:
                 case SIOCGIFBRDADDR:
                 case SIOCGIFDSTADDR:
                 case SIOCGIFNETMASK:
                 case SIOCGIFPFLAGS:
                 case SIOCGIFTXQLEN:
                 case SIOCGMIIPHY:
                 case SIOCGMIIREG:
                         if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
                                 err = -EFAULT;
                         break;
                 }
         }
         return err;
 }
 
 static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
                         struct compat_ifreq __user *uifr32)
 {
         struct ifreq ifr;
         struct compat_ifmap __user *uifmap32;
         mm_segment_t old_fs;
         int err;
 
         uifmap32 = &uifr32->ifr_ifru.ifru_map;
         err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
         err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
         err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
         err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
         err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
         err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
         err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
         if (err)
                 return -EFAULT;
 
         old_fs = get_fs();
         set_fs(KERNEL_DS);
         err = dev_ioctl(net, cmd, (void  __user __force *)&ifr);
         set_fs(old_fs);
 
         if (cmd == SIOCGIFMAP && !err) {
                 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
                 err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
                 err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
                 err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
                 err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
                 err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
                 err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
                 if (err)
                         err = -EFAULT;
         }
         return err;
 }
 
 static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
 {
         void __user *uptr;
         compat_uptr_t uptr32;
         struct ifreq __user *uifr;
 
         uifr = compat_alloc_user_space(sizeof(*uifr));
         if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
                 return -EFAULT;
 
         if (get_user(uptr32, &uifr32->ifr_data))
                 return -EFAULT;
 
         uptr = compat_ptr(uptr32);
 
         if (put_user(uptr, &uifr->ifr_data))
                 return -EFAULT;
 
         return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
 }
 
 struct rtentry32 {
         u32             rt_pad1;
         struct sockaddr rt_dst;         /* target address               */
         struct sockaddr rt_gateway;     /* gateway addr (RTF_GATEWAY)   */
         struct sockaddr rt_genmask;     /* target network mask (IP)     */
         unsigned short  rt_flags;
         short           rt_pad2;
         u32             rt_pad3;
         unsigned char   rt_tos;
         unsigned char   rt_class;
         short           rt_pad4;
         short           rt_metric;      /* +1 for binary compatibility! */
         /* char * */ u32 rt_dev;        /* forcing the device at add    */
         u32             rt_mtu;         /* per route MTU/Window         */
         u32             rt_window;      /* Window clamping              */
         unsigned short  rt_irtt;        /* Initial RTT                  */
 };
 
 struct in6_rtmsg32 {
         struct in6_addr         rtmsg_dst;
         struct in6_addr         rtmsg_src;
         struct in6_addr         rtmsg_gateway;
         u32                     rtmsg_type;
         u16                     rtmsg_dst_len;
         u16                     rtmsg_src_len;
         u32                     rtmsg_metric;
         u32                     rtmsg_info;
         u32                     rtmsg_flags;
         s32                     rtmsg_ifindex;
 };
 
 static int routing_ioctl(struct net *net, struct socket *sock,
                          unsigned int cmd, void __user *argp)
 {
         int ret;
         void *r = NULL;
         struct in6_rtmsg r6;
         struct rtentry r4;
         char devname[16];
         u32 rtdev;
         mm_segment_t old_fs = get_fs();
 
         if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
                 struct in6_rtmsg32 __user *ur6 = argp;
                 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
                         3 * sizeof(struct in6_addr));
                 ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
                 ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
                 ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
                 ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
                 ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
                 ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
                 ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
 
                 r = (void *) &r6;
         } else { /* ipv4 */
                 struct rtentry32 __user *ur4 = argp;
                 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
                                         3 * sizeof(struct sockaddr));
                 ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
                 ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
                 ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
                 ret |= __get_user(r4.rt_window, &(ur4->rt_window));
                 ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
                 ret |= __get_user(rtdev, &(ur4->rt_dev));
                 if (rtdev) {
                         ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
                         r4.rt_dev = (char __user __force *)devname;
                         devname[15] = 0;
                 } else
                         r4.rt_dev = NULL;
 
                 r = (void *) &r4;
         }
 
         if (ret) {
                 ret = -EFAULT;
                 goto out;
         }
 
         set_fs(KERNEL_DS);
         ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
         set_fs(old_fs);
 
 out:
         return ret;
 }
 
 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
  * for some operations; this forces use of the newer bridge-utils that
  * use compatible ioctls
  */
 static int old_bridge_ioctl(compat_ulong_t __user *argp)
 {
         compat_ulong_t tmp;
 
         if (get_user(tmp, argp))
                 return -EFAULT;
         if (tmp == BRCTL_GET_VERSION)
                 return BRCTL_VERSION + 1;
         return -EINVAL;
 }
 
 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
                          unsigned int cmd, unsigned long arg)
 {
         void __user *argp = compat_ptr(arg);
         struct sock *sk = sock->sk;
         struct net *net = sock_net(sk);
 
         if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
                 return siocdevprivate_ioctl(net, cmd, argp);
 
         switch (cmd) {
         case SIOCSIFBR:
         case SIOCGIFBR:
                 return old_bridge_ioctl(argp);
         case SIOCGIFNAME:
                 return dev_ifname32(net, argp);
         case SIOCGIFCONF:
                 return dev_ifconf(net, argp);
         case SIOCETHTOOL:
                 return ethtool_ioctl(net, argp);
         case SIOCWANDEV:
                 return compat_siocwandev(net, argp);
         case SIOCGIFMAP:
         case SIOCSIFMAP:
                 return compat_sioc_ifmap(net, cmd, argp);
         case SIOCBONDENSLAVE:
         case SIOCBONDRELEASE:
         case SIOCBONDSETHWADDR:
         case SIOCBONDSLAVEINFOQUERY:
         case SIOCBONDINFOQUERY:
         case SIOCBONDCHANGEACTIVE:
                 return bond_ioctl(net, cmd, argp);
         case SIOCADDRT:
         case SIOCDELRT:
                 return routing_ioctl(net, sock, cmd, argp);
         case SIOCGSTAMP:
                 return do_siocgstamp(net, sock, cmd, argp);
         case SIOCGSTAMPNS:
                 return do_siocgstampns(net, sock, cmd, argp);
         case SIOCSHWTSTAMP:
                 return compat_siocshwtstamp(net, argp);
 
         case FIOSETOWN:
         case SIOCSPGRP:
         case FIOGETOWN:
         case SIOCGPGRP:
         case SIOCBRADDBR:
         case SIOCBRDELBR:
         case SIOCGIFVLAN:
         case SIOCSIFVLAN:
         case SIOCADDDLCI:
         case SIOCDELDLCI:
                 return sock_ioctl(file, cmd, arg);
 
         case SIOCGIFFLAGS:
         case SIOCSIFFLAGS:
         case SIOCGIFMETRIC:
         case SIOCSIFMETRIC:
         case SIOCGIFMTU:
         case SIOCSIFMTU:
         case SIOCGIFMEM:
         case SIOCSIFMEM:
         case SIOCGIFHWADDR:
         case SIOCSIFHWADDR:
         case SIOCADDMULTI:
         case SIOCDELMULTI:
         case SIOCGIFINDEX:
         case SIOCGIFADDR:
         case SIOCSIFADDR:
         case SIOCSIFHWBROADCAST:
         case SIOCDIFADDR:
         case SIOCGIFBRDADDR:
         case SIOCSIFBRDADDR:
         case SIOCGIFDSTADDR:
         case SIOCSIFDSTADDR:
         case SIOCGIFNETMASK:
         case SIOCSIFNETMASK:
         case SIOCSIFPFLAGS:
         case SIOCGIFPFLAGS:
         case SIOCGIFTXQLEN:
         case SIOCSIFTXQLEN:
         case SIOCBRADDIF:
         case SIOCBRDELIF:
         case SIOCSIFNAME:
         case SIOCGMIIPHY:
         case SIOCGMIIREG:
         case SIOCSMIIREG:
                 return dev_ifsioc(net, sock, cmd, argp);
 
         case SIOCSARP:
         case SIOCGARP:
         case SIOCDARP:
         case SIOCATMARK:
                 return sock_do_ioctl(net, sock, cmd, arg);
         }
 
         return -ENOIOCTLCMD;
 }
 
 static long compat_sock_ioctl(struct file *file, unsigned int cmd,
                               unsigned long arg)
 {
         struct socket *sock = file->private_data;
         int ret = -ENOIOCTLCMD;
         struct sock *sk;
         struct net *net;
 
         sk = sock->sk;
         net = sock_net(sk);
 
         if (sock->ops->compat_ioctl)
                 ret = sock->ops->compat_ioctl(sock, cmd, arg);
 
         if (ret == -ENOIOCTLCMD &&
             (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
                 ret = compat_wext_handle_ioctl(net, cmd, arg);
 
         if (ret == -ENOIOCTLCMD)
                 ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
 
         return ret;
 }
 #endif
 
 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
 {
         return sock->ops->bind(sock, addr, addrlen);
 }
 EXPORT_SYMBOL(kernel_bind);
 
 int kernel_listen(struct socket *sock, int backlog)
 {
         return sock->ops->listen(sock, backlog);
 }
 EXPORT_SYMBOL(kernel_listen);
 
 int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
 {
         struct sock *sk = sock->sk;
         int err;
 
         err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
                                newsock);
         if (err < 0)
                 goto done;
 
         err = sock->ops->accept(sock, *newsock, flags);
         if (err < 0) {
                 sock_release(*newsock);
                 *newsock = NULL;
                 goto done;
         }
 
         (*newsock)->ops = sock->ops;
         __module_get((*newsock)->ops->owner);
 
 done:
         return err;
 }
 EXPORT_SYMBOL(kernel_accept);
 
 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
                    int flags)
 {
         return sock->ops->connect(sock, addr, addrlen, flags);
 }
 EXPORT_SYMBOL(kernel_connect);
 
 int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
                          int *addrlen)
 {
         return sock->ops->getname(sock, addr, addrlen, 0);
 }
 EXPORT_SYMBOL(kernel_getsockname);
 
 int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
                          int *addrlen)
 {
         return sock->ops->getname(sock, addr, addrlen, 1);
 }
 EXPORT_SYMBOL(kernel_getpeername);
 
 int kernel_getsockopt(struct socket *sock, int level, int optname,
                         char *optval, int *optlen)
 {
         mm_segment_t oldfs = get_fs();
         char __user *uoptval;
         int __user *uoptlen;
         int err;
 
         uoptval = (char __user __force *) optval;
         uoptlen = (int __user __force *) optlen;
 
         set_fs(KERNEL_DS);
         if (level == SOL_SOCKET)
                 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
         else
                 err = sock->ops->getsockopt(sock, level, optname, uoptval,
                                             uoptlen);
         set_fs(oldfs);
         return err;
 }
 EXPORT_SYMBOL(kernel_getsockopt);
 
 int kernel_setsockopt(struct socket *sock, int level, int optname,
                         char *optval, unsigned int optlen)
 {
         mm_segment_t oldfs = get_fs();
         char __user *uoptval;
         int err;
 
         uoptval = (char __user __force *) optval;
 
         set_fs(KERNEL_DS);
         if (level == SOL_SOCKET)
                 err = sock_setsockopt(sock, level, optname, uoptval, optlen);
         else
                 err = sock->ops->setsockopt(sock, level, optname, uoptval,
                                             optlen);
         set_fs(oldfs);
         return err;
 }
 EXPORT_SYMBOL(kernel_setsockopt);
 
 int kernel_sendpage(struct socket *sock, struct page *page, int offset,
                     size_t size, int flags)
 {
         if (sock->ops->sendpage)
                 return sock->ops->sendpage(sock, page, offset, size, flags);
 
         return sock_no_sendpage(sock, page, offset, size, flags);
 }
 EXPORT_SYMBOL(kernel_sendpage);
 
 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
 {
         mm_segment_t oldfs = get_fs();
         int err;
 
         set_fs(KERNEL_DS);
         err = sock->ops->ioctl(sock, cmd, arg);
         set_fs(oldfs);
 
         return err;
 }
 EXPORT_SYMBOL(kernel_sock_ioctl);
 
 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
 {
         return sock->ops->shutdown(sock, how);
 }
 EXPORT_SYMBOL(kernel_sock_shutdown);