linux/net/socket.c
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   1/*
   2 * NET          An implementation of the SOCKET network access protocol.
   3 *
   4 * Version:     @(#)socket.c    1.1.93  18/02/95
   5 *
   6 * Authors:     Orest Zborowski, <obz@Kodak.COM>
   7 *              Ross Biro
   8 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
   9 *
  10 * Fixes:
  11 *              Anonymous       :       NOTSOCK/BADF cleanup. Error fix in
  12 *                                      shutdown()
  13 *              Alan Cox        :       verify_area() fixes
  14 *              Alan Cox        :       Removed DDI
  15 *              Jonathan Kamens :       SOCK_DGRAM reconnect bug
  16 *              Alan Cox        :       Moved a load of checks to the very
  17 *                                      top level.
  18 *              Alan Cox        :       Move address structures to/from user
  19 *                                      mode above the protocol layers.
  20 *              Rob Janssen     :       Allow 0 length sends.
  21 *              Alan Cox        :       Asynchronous I/O support (cribbed from the
  22 *                                      tty drivers).
  23 *              Niibe Yutaka    :       Asynchronous I/O for writes (4.4BSD style)
  24 *              Jeff Uphoff     :       Made max number of sockets command-line
  25 *                                      configurable.
  26 *              Matti Aarnio    :       Made the number of sockets dynamic,
  27 *                                      to be allocated when needed, and mr.
  28 *                                      Uphoff's max is used as max to be
  29 *                                      allowed to allocate.
  30 *              Linus           :       Argh. removed all the socket allocation
  31 *                                      altogether: it's in the inode now.
  32 *              Alan Cox        :       Made sock_alloc()/sock_release() public
  33 *                                      for NetROM and future kernel nfsd type
  34 *                                      stuff.
  35 *              Alan Cox        :       sendmsg/recvmsg basics.
  36 *              Tom Dyas        :       Export net symbols.
  37 *              Marcin Dalecki  :       Fixed problems with CONFIG_NET="n".
  38 *              Alan Cox        :       Added thread locking to sys_* calls
  39 *                                      for sockets. May have errors at the
  40 *                                      moment.
  41 *              Kevin Buhr      :       Fixed the dumb errors in the above.
  42 *              Andi Kleen      :       Some small cleanups, optimizations,
  43 *                                      and fixed a copy_from_user() bug.
  44 *              Tigran Aivazian :       sys_send(args) calls sys_sendto(args, NULL, 0)
  45 *              Tigran Aivazian :       Made listen(2) backlog sanity checks
  46 *                                      protocol-independent
  47 *
  48 *
  49 *              This program is free software; you can redistribute it and/or
  50 *              modify it under the terms of the GNU General Public License
  51 *              as published by the Free Software Foundation; either version
  52 *              2 of the License, or (at your option) any later version.
  53 *
  54 *
  55 *      This module is effectively the top level interface to the BSD socket
  56 *      paradigm.
  57 *
  58 *      Based upon Swansea University Computer Society NET3.039
  59 */
  60
  61#include <linux/mm.h>
  62#include <linux/socket.h>
  63#include <linux/file.h>
  64#include <linux/net.h>
  65#include <linux/interrupt.h>
  66#include <linux/thread_info.h>
  67#include <linux/rcupdate.h>
  68#include <linux/netdevice.h>
  69#include <linux/proc_fs.h>
  70#include <linux/seq_file.h>
  71#include <linux/mutex.h>
  72#include <linux/wanrouter.h>
  73#include <linux/if_bridge.h>
  74#include <linux/if_frad.h>
  75#include <linux/if_vlan.h>
  76#include <linux/init.h>
  77#include <linux/poll.h>
  78#include <linux/cache.h>
  79#include <linux/module.h>
  80#include <linux/highmem.h>
  81#include <linux/mount.h>
  82#include <linux/security.h>
  83#include <linux/syscalls.h>
  84#include <linux/compat.h>
  85#include <linux/kmod.h>
  86#include <linux/audit.h>
  87#include <linux/wireless.h>
  88#include <linux/nsproxy.h>
  89#include <linux/magic.h>
  90#include <linux/slab.h>
  91#include <linux/xattr.h>
  92
  93#include <asm/uaccess.h>
  94#include <asm/unistd.h>
  95
  96#include <net/compat.h>
  97#include <net/wext.h>
  98#include <net/cls_cgroup.h>
  99
 100#include <net/sock.h>
 101#include <linux/netfilter.h>
 102
 103#include <linux/if_tun.h>
 104#include <linux/ipv6_route.h>
 105#include <linux/route.h>
 106#include <linux/sockios.h>
 107#include <linux/atalk.h>
 108
 109static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
 110static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
 111                         unsigned long nr_segs, loff_t pos);
 112static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
 113                          unsigned long nr_segs, loff_t pos);
 114static int sock_mmap(struct file *file, struct vm_area_struct *vma);
 115
 116static int sock_close(struct inode *inode, struct file *file);
 117static unsigned int sock_poll(struct file *file,
 118                              struct poll_table_struct *wait);
 119static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 120#ifdef CONFIG_COMPAT
 121static long compat_sock_ioctl(struct file *file,
 122                              unsigned int cmd, unsigned long arg);
 123#endif
 124static int sock_fasync(int fd, struct file *filp, int on);
 125static ssize_t sock_sendpage(struct file *file, struct page *page,
 126                             int offset, size_t size, loff_t *ppos, int more);
 127static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
 128                                struct pipe_inode_info *pipe, size_t len,
 129                                unsigned int flags);
 130
 131/*
 132 *      Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
 133 *      in the operation structures but are done directly via the socketcall() multiplexor.
 134 */
 135
 136static const struct file_operations socket_file_ops = {
 137        .owner =        THIS_MODULE,
 138        .llseek =       no_llseek,
 139        .aio_read =     sock_aio_read,
 140        .aio_write =    sock_aio_write,
 141        .poll =         sock_poll,
 142        .unlocked_ioctl = sock_ioctl,
 143#ifdef CONFIG_COMPAT
 144        .compat_ioctl = compat_sock_ioctl,
 145#endif
 146        .mmap =         sock_mmap,
 147        .open =         sock_no_open,   /* special open code to disallow open via /proc */
 148        .release =      sock_close,
 149        .fasync =       sock_fasync,
 150        .sendpage =     sock_sendpage,
 151        .splice_write = generic_splice_sendpage,
 152        .splice_read =  sock_splice_read,
 153};
 154
 155/*
 156 *      The protocol list. Each protocol is registered in here.
 157 */
 158
 159static DEFINE_SPINLOCK(net_family_lock);
 160static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
 161
 162/*
 163 *      Statistics counters of the socket lists
 164 */
 165
 166static DEFINE_PER_CPU(int, sockets_in_use);
 167
 168/*
 169 * Support routines.
 170 * Move socket addresses back and forth across the kernel/user
 171 * divide and look after the messy bits.
 172 */
 173
 174/**
 175 *      move_addr_to_kernel     -       copy a socket address into kernel space
 176 *      @uaddr: Address in user space
 177 *      @kaddr: Address in kernel space
 178 *      @ulen: Length in user space
 179 *
 180 *      The address is copied into kernel space. If the provided address is
 181 *      too long an error code of -EINVAL is returned. If the copy gives
 182 *      invalid addresses -EFAULT is returned. On a success 0 is returned.
 183 */
 184
 185int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
 186{
 187        if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
 188                return -EINVAL;
 189        if (ulen == 0)
 190                return 0;
 191        if (copy_from_user(kaddr, uaddr, ulen))
 192                return -EFAULT;
 193        return audit_sockaddr(ulen, kaddr);
 194}
 195
 196/**
 197 *      move_addr_to_user       -       copy an address to user space
 198 *      @kaddr: kernel space address
 199 *      @klen: length of address in kernel
 200 *      @uaddr: user space address
 201 *      @ulen: pointer to user length field
 202 *
 203 *      The value pointed to by ulen on entry is the buffer length available.
 204 *      This is overwritten with the buffer space used. -EINVAL is returned
 205 *      if an overlong buffer is specified or a negative buffer size. -EFAULT
 206 *      is returned if either the buffer or the length field are not
 207 *      accessible.
 208 *      After copying the data up to the limit the user specifies, the true
 209 *      length of the data is written over the length limit the user
 210 *      specified. Zero is returned for a success.
 211 */
 212
 213static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
 214                             void __user *uaddr, int __user *ulen)
 215{
 216        int err;
 217        int len;
 218
 219        err = get_user(len, ulen);
 220        if (err)
 221                return err;
 222        if (len > klen)
 223                len = klen;
 224        if (len < 0 || len > sizeof(struct sockaddr_storage))
 225                return -EINVAL;
 226        if (len) {
 227                if (audit_sockaddr(klen, kaddr))
 228                        return -ENOMEM;
 229                if (copy_to_user(uaddr, kaddr, len))
 230                        return -EFAULT;
 231        }
 232        /*
 233         *      "fromlen shall refer to the value before truncation.."
 234         *                      1003.1g
 235         */
 236        return __put_user(klen, ulen);
 237}
 238
 239static struct kmem_cache *sock_inode_cachep __read_mostly;
 240
 241static struct inode *sock_alloc_inode(struct super_block *sb)
 242{
 243        struct socket_alloc *ei;
 244        struct socket_wq *wq;
 245
 246        ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
 247        if (!ei)
 248                return NULL;
 249        wq = kmalloc(sizeof(*wq), GFP_KERNEL);
 250        if (!wq) {
 251                kmem_cache_free(sock_inode_cachep, ei);
 252                return NULL;
 253        }
 254        init_waitqueue_head(&wq->wait);
 255        wq->fasync_list = NULL;
 256        RCU_INIT_POINTER(ei->socket.wq, wq);
 257
 258        ei->socket.state = SS_UNCONNECTED;
 259        ei->socket.flags = 0;
 260        ei->socket.ops = NULL;
 261        ei->socket.sk = NULL;
 262        ei->socket.file = NULL;
 263
 264        return &ei->vfs_inode;
 265}
 266
 267static void sock_destroy_inode(struct inode *inode)
 268{
 269        struct socket_alloc *ei;
 270        struct socket_wq *wq;
 271
 272        ei = container_of(inode, struct socket_alloc, vfs_inode);
 273        wq = rcu_dereference_protected(ei->socket.wq, 1);
 274        kfree_rcu(wq, rcu);
 275        kmem_cache_free(sock_inode_cachep, ei);
 276}
 277
 278static void init_once(void *foo)
 279{
 280        struct socket_alloc *ei = (struct socket_alloc *)foo;
 281
 282        inode_init_once(&ei->vfs_inode);
 283}
 284
 285static int init_inodecache(void)
 286{
 287        sock_inode_cachep = kmem_cache_create("sock_inode_cache",
 288                                              sizeof(struct socket_alloc),
 289                                              0,
 290                                              (SLAB_HWCACHE_ALIGN |
 291                                               SLAB_RECLAIM_ACCOUNT |
 292                                               SLAB_MEM_SPREAD),
 293                                              init_once);
 294        if (sock_inode_cachep == NULL)
 295                return -ENOMEM;
 296        return 0;
 297}
 298
 299static const struct super_operations sockfs_ops = {
 300        .alloc_inode    = sock_alloc_inode,
 301        .destroy_inode  = sock_destroy_inode,
 302        .statfs         = simple_statfs,
 303};
 304
 305/*
 306 * sockfs_dname() is called from d_path().
 307 */
 308static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
 309{
 310        return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]",
 311                                dentry->d_inode->i_ino);
 312}
 313
 314static const struct dentry_operations sockfs_dentry_operations = {
 315        .d_dname  = sockfs_dname,
 316};
 317
 318static struct dentry *sockfs_mount(struct file_system_type *fs_type,
 319                         int flags, const char *dev_name, void *data)
 320{
 321        return mount_pseudo(fs_type, "socket:", &sockfs_ops,
 322                &sockfs_dentry_operations, SOCKFS_MAGIC);
 323}
 324
 325static struct vfsmount *sock_mnt __read_mostly;
 326
 327static struct file_system_type sock_fs_type = {
 328        .name =         "sockfs",
 329        .mount =        sockfs_mount,
 330        .kill_sb =      kill_anon_super,
 331};
 332
 333/*
 334 *      Obtains the first available file descriptor and sets it up for use.
 335 *
 336 *      These functions create file structures and maps them to fd space
 337 *      of the current process. On success it returns file descriptor
 338 *      and file struct implicitly stored in sock->file.
 339 *      Note that another thread may close file descriptor before we return
 340 *      from this function. We use the fact that now we do not refer
 341 *      to socket after mapping. If one day we will need it, this
 342 *      function will increment ref. count on file by 1.
 343 *
 344 *      In any case returned fd MAY BE not valid!
 345 *      This race condition is unavoidable
 346 *      with shared fd spaces, we cannot solve it inside kernel,
 347 *      but we take care of internal coherence yet.
 348 */
 349
 350struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
 351{
 352        struct qstr name = { .name = "" };
 353        struct path path;
 354        struct file *file;
 355
 356        if (dname) {
 357                name.name = dname;
 358                name.len = strlen(name.name);
 359        } else if (sock->sk) {
 360                name.name = sock->sk->sk_prot_creator->name;
 361                name.len = strlen(name.name);
 362        }
 363        path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
 364        if (unlikely(!path.dentry))
 365                return ERR_PTR(-ENOMEM);
 366        path.mnt = mntget(sock_mnt);
 367
 368        d_instantiate(path.dentry, SOCK_INODE(sock));
 369        SOCK_INODE(sock)->i_fop = &socket_file_ops;
 370
 371        file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
 372                  &socket_file_ops);
 373        if (unlikely(!file)) {
 374                /* drop dentry, keep inode */
 375                ihold(path.dentry->d_inode);
 376                path_put(&path);
 377                return ERR_PTR(-ENFILE);
 378        }
 379
 380        sock->file = file;
 381        file->f_flags = O_RDWR | (flags & O_NONBLOCK);
 382        file->f_pos = 0;
 383        file->private_data = sock;
 384        return file;
 385}
 386EXPORT_SYMBOL(sock_alloc_file);
 387
 388static int sock_map_fd(struct socket *sock, int flags)
 389{
 390        struct file *newfile;
 391        int fd = get_unused_fd_flags(flags);
 392        if (unlikely(fd < 0))
 393                return fd;
 394
 395        newfile = sock_alloc_file(sock, flags, NULL);
 396        if (likely(!IS_ERR(newfile))) {
 397                fd_install(fd, newfile);
 398                return fd;
 399        }
 400
 401        put_unused_fd(fd);
 402        return PTR_ERR(newfile);
 403}
 404
 405struct socket *sock_from_file(struct file *file, int *err)
 406{
 407        if (file->f_op == &socket_file_ops)
 408                return file->private_data;      /* set in sock_map_fd */
 409
 410        *err = -ENOTSOCK;
 411        return NULL;
 412}
 413EXPORT_SYMBOL(sock_from_file);
 414
 415/**
 416 *      sockfd_lookup - Go from a file number to its socket slot
 417 *      @fd: file handle
 418 *      @err: pointer to an error code return
 419 *
 420 *      The file handle passed in is locked and the socket it is bound
 421 *      too is returned. If an error occurs the err pointer is overwritten
 422 *      with a negative errno code and NULL is returned. The function checks
 423 *      for both invalid handles and passing a handle which is not a socket.
 424 *
 425 *      On a success the socket object pointer is returned.
 426 */
 427
 428struct socket *sockfd_lookup(int fd, int *err)
 429{
 430        struct file *file;
 431        struct socket *sock;
 432
 433        file = fget(fd);
 434        if (!file) {
 435                *err = -EBADF;
 436                return NULL;
 437        }
 438
 439        sock = sock_from_file(file, err);
 440        if (!sock)
 441                fput(file);
 442        return sock;
 443}
 444EXPORT_SYMBOL(sockfd_lookup);
 445
 446static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
 447{
 448        struct file *file;
 449        struct socket *sock;
 450
 451        *err = -EBADF;
 452        file = fget_light(fd, fput_needed);
 453        if (file) {
 454                sock = sock_from_file(file, err);
 455                if (sock)
 456                        return sock;
 457                fput_light(file, *fput_needed);
 458        }
 459        return NULL;
 460}
 461
 462#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
 463#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
 464#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
 465static ssize_t sockfs_getxattr(struct dentry *dentry,
 466                               const char *name, void *value, size_t size)
 467{
 468        const char *proto_name;
 469        size_t proto_size;
 470        int error;
 471
 472        error = -ENODATA;
 473        if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
 474                proto_name = dentry->d_name.name;
 475                proto_size = strlen(proto_name);
 476
 477                if (value) {
 478                        error = -ERANGE;
 479                        if (proto_size + 1 > size)
 480                                goto out;
 481
 482                        strncpy(value, proto_name, proto_size + 1);
 483                }
 484                error = proto_size + 1;
 485        }
 486
 487out:
 488        return error;
 489}
 490
 491static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
 492                                size_t size)
 493{
 494        ssize_t len;
 495        ssize_t used = 0;
 496
 497        len = security_inode_listsecurity(dentry->d_inode, buffer, size);
 498        if (len < 0)
 499                return len;
 500        used += len;
 501        if (buffer) {
 502                if (size < used)
 503                        return -ERANGE;
 504                buffer += len;
 505        }
 506
 507        len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
 508        used += len;
 509        if (buffer) {
 510                if (size < used)
 511                        return -ERANGE;
 512                memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
 513                buffer += len;
 514        }
 515
 516        return used;
 517}
 518
 519static const struct inode_operations sockfs_inode_ops = {
 520        .getxattr = sockfs_getxattr,
 521        .listxattr = sockfs_listxattr,
 522};
 523
 524/**
 525 *      sock_alloc      -       allocate a socket
 526 *
 527 *      Allocate a new inode and socket object. The two are bound together
 528 *      and initialised. The socket is then returned. If we are out of inodes
 529 *      NULL is returned.
 530 */
 531
 532static struct socket *sock_alloc(void)
 533{
 534        struct inode *inode;
 535        struct socket *sock;
 536
 537        inode = new_inode_pseudo(sock_mnt->mnt_sb);
 538        if (!inode)
 539                return NULL;
 540
 541        sock = SOCKET_I(inode);
 542
 543        kmemcheck_annotate_bitfield(sock, type);
 544        inode->i_ino = get_next_ino();
 545        inode->i_mode = S_IFSOCK | S_IRWXUGO;
 546        inode->i_uid = current_fsuid();
 547        inode->i_gid = current_fsgid();
 548        inode->i_op = &sockfs_inode_ops;
 549
 550        this_cpu_add(sockets_in_use, 1);
 551        return sock;
 552}
 553
 554/*
 555 *      In theory you can't get an open on this inode, but /proc provides
 556 *      a back door. Remember to keep it shut otherwise you'll let the
 557 *      creepy crawlies in.
 558 */
 559
 560static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
 561{
 562        return -ENXIO;
 563}
 564
 565const struct file_operations bad_sock_fops = {
 566        .owner = THIS_MODULE,
 567        .open = sock_no_open,
 568        .llseek = noop_llseek,
 569};
 570
 571/**
 572 *      sock_release    -       close a socket
 573 *      @sock: socket to close
 574 *
 575 *      The socket is released from the protocol stack if it has a release
 576 *      callback, and the inode is then released if the socket is bound to
 577 *      an inode not a file.
 578 */
 579
 580void sock_release(struct socket *sock)
 581{
 582        if (sock->ops) {
 583                struct module *owner = sock->ops->owner;
 584
 585                sock->ops->release(sock);
 586                sock->ops = NULL;
 587                module_put(owner);
 588        }
 589
 590        if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
 591                printk(KERN_ERR "sock_release: fasync list not empty!\n");
 592
 593        if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags))
 594                return;
 595
 596        this_cpu_sub(sockets_in_use, 1);
 597        if (!sock->file) {
 598                iput(SOCK_INODE(sock));
 599                return;
 600        }
 601        sock->file = NULL;
 602}
 603EXPORT_SYMBOL(sock_release);
 604
 605int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags)
 606{
 607        *tx_flags = 0;
 608        if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
 609                *tx_flags |= SKBTX_HW_TSTAMP;
 610        if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
 611                *tx_flags |= SKBTX_SW_TSTAMP;
 612        if (sock_flag(sk, SOCK_WIFI_STATUS))
 613                *tx_flags |= SKBTX_WIFI_STATUS;
 614        return 0;
 615}
 616EXPORT_SYMBOL(sock_tx_timestamp);
 617
 618static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
 619                                       struct msghdr *msg, size_t size)
 620{
 621        struct sock_iocb *si = kiocb_to_siocb(iocb);
 622
 623        si->sock = sock;
 624        si->scm = NULL;
 625        si->msg = msg;
 626        si->size = size;
 627
 628        return sock->ops->sendmsg(iocb, sock, msg, size);
 629}
 630
 631static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 632                                 struct msghdr *msg, size_t size)
 633{
 634        int err = security_socket_sendmsg(sock, msg, size);
 635
 636        return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size);
 637}
 638
 639int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 640{
 641        struct kiocb iocb;
 642        struct sock_iocb siocb;
 643        int ret;
 644
 645        init_sync_kiocb(&iocb, NULL);
 646        iocb.private = &siocb;
 647        ret = __sock_sendmsg(&iocb, sock, msg, size);
 648        if (-EIOCBQUEUED == ret)
 649                ret = wait_on_sync_kiocb(&iocb);
 650        return ret;
 651}
 652EXPORT_SYMBOL(sock_sendmsg);
 653
 654static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size)
 655{
 656        struct kiocb iocb;
 657        struct sock_iocb siocb;
 658        int ret;
 659
 660        init_sync_kiocb(&iocb, NULL);
 661        iocb.private = &siocb;
 662        ret = __sock_sendmsg_nosec(&iocb, sock, msg, size);
 663        if (-EIOCBQUEUED == ret)
 664                ret = wait_on_sync_kiocb(&iocb);
 665        return ret;
 666}
 667
 668int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 669                   struct kvec *vec, size_t num, size_t size)
 670{
 671        mm_segment_t oldfs = get_fs();
 672        int result;
 673
 674        set_fs(KERNEL_DS);
 675        /*
 676         * the following is safe, since for compiler definitions of kvec and
 677         * iovec are identical, yielding the same in-core layout and alignment
 678         */
 679        msg->msg_iov = (struct iovec *)vec;
 680        msg->msg_iovlen = num;
 681        result = sock_sendmsg(sock, msg, size);
 682        set_fs(oldfs);
 683        return result;
 684}
 685EXPORT_SYMBOL(kernel_sendmsg);
 686
 687static int ktime2ts(ktime_t kt, struct timespec *ts)
 688{
 689        if (kt.tv64) {
 690                *ts = ktime_to_timespec(kt);
 691                return 1;
 692        } else {
 693                return 0;
 694        }
 695}
 696
 697/*
 698 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP)
 699 */
 700void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
 701        struct sk_buff *skb)
 702{
 703        int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
 704        struct timespec ts[3];
 705        int empty = 1;
 706        struct skb_shared_hwtstamps *shhwtstamps =
 707                skb_hwtstamps(skb);
 708
 709        /* Race occurred between timestamp enabling and packet
 710           receiving.  Fill in the current time for now. */
 711        if (need_software_tstamp && skb->tstamp.tv64 == 0)
 712                __net_timestamp(skb);
 713
 714        if (need_software_tstamp) {
 715                if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) {
 716                        struct timeval tv;
 717                        skb_get_timestamp(skb, &tv);
 718                        put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
 719                                 sizeof(tv), &tv);
 720                } else {
 721                        skb_get_timestampns(skb, &ts[0]);
 722                        put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
 723                                 sizeof(ts[0]), &ts[0]);
 724                }
 725        }
 726
 727
 728        memset(ts, 0, sizeof(ts));
 729        if (skb->tstamp.tv64 &&
 730            sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) {
 731                skb_get_timestampns(skb, ts + 0);
 732                empty = 0;
 733        }
 734        if (shhwtstamps) {
 735                if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
 736                    ktime2ts(shhwtstamps->syststamp, ts + 1))
 737                        empty = 0;
 738                if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
 739                    ktime2ts(shhwtstamps->hwtstamp, ts + 2))
 740                        empty = 0;
 741        }
 742        if (!empty)
 743                put_cmsg(msg, SOL_SOCKET,
 744                         SCM_TIMESTAMPING, sizeof(ts), &ts);
 745}
 746EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
 747
 748void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
 749        struct sk_buff *skb)
 750{
 751        int ack;
 752
 753        if (!sock_flag(sk, SOCK_WIFI_STATUS))
 754                return;
 755        if (!skb->wifi_acked_valid)
 756                return;
 757
 758        ack = skb->wifi_acked;
 759
 760        put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack);
 761}
 762EXPORT_SYMBOL_GPL(__sock_recv_wifi_status);
 763
 764static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk,
 765                                   struct sk_buff *skb)
 766{
 767        if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
 768                put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
 769                        sizeof(__u32), &skb->dropcount);
 770}
 771
 772void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
 773        struct sk_buff *skb)
 774{
 775        sock_recv_timestamp(msg, sk, skb);
 776        sock_recv_drops(msg, sk, skb);
 777}
 778EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
 779
 780static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
 781                                       struct msghdr *msg, size_t size, int flags)
 782{
 783        struct sock_iocb *si = kiocb_to_siocb(iocb);
 784
 785        si->sock = sock;
 786        si->scm = NULL;
 787        si->msg = msg;
 788        si->size = size;
 789        si->flags = flags;
 790
 791        return sock->ops->recvmsg(iocb, sock, msg, size, flags);
 792}
 793
 794static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 795                                 struct msghdr *msg, size_t size, int flags)
 796{
 797        int err = security_socket_recvmsg(sock, msg, size, flags);
 798
 799        return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags);
 800}
 801
 802int sock_recvmsg(struct socket *sock, struct msghdr *msg,
 803                 size_t size, int flags)
 804{
 805        struct kiocb iocb;
 806        struct sock_iocb siocb;
 807        int ret;
 808
 809        init_sync_kiocb(&iocb, NULL);
 810        iocb.private = &siocb;
 811        ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
 812        if (-EIOCBQUEUED == ret)
 813                ret = wait_on_sync_kiocb(&iocb);
 814        return ret;
 815}
 816EXPORT_SYMBOL(sock_recvmsg);
 817
 818static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
 819                              size_t size, int flags)
 820{
 821        struct kiocb iocb;
 822        struct sock_iocb siocb;
 823        int ret;
 824
 825        init_sync_kiocb(&iocb, NULL);
 826        iocb.private = &siocb;
 827        ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags);
 828        if (-EIOCBQUEUED == ret)
 829                ret = wait_on_sync_kiocb(&iocb);
 830        return ret;
 831}
 832
 833/**
 834 * kernel_recvmsg - Receive a message from a socket (kernel space)
 835 * @sock:       The socket to receive the message from
 836 * @msg:        Received message
 837 * @vec:        Input s/g array for message data
 838 * @num:        Size of input s/g array
 839 * @size:       Number of bytes to read
 840 * @flags:      Message flags (MSG_DONTWAIT, etc...)
 841 *
 842 * On return the msg structure contains the scatter/gather array passed in the
 843 * vec argument. The array is modified so that it consists of the unfilled
 844 * portion of the original array.
 845 *
 846 * The returned value is the total number of bytes received, or an error.
 847 */
 848int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 849                   struct kvec *vec, size_t num, size_t size, int flags)
 850{
 851        mm_segment_t oldfs = get_fs();
 852        int result;
 853
 854        set_fs(KERNEL_DS);
 855        /*
 856         * the following is safe, since for compiler definitions of kvec and
 857         * iovec are identical, yielding the same in-core layout and alignment
 858         */
 859        msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num;
 860        result = sock_recvmsg(sock, msg, size, flags);
 861        set_fs(oldfs);
 862        return result;
 863}
 864EXPORT_SYMBOL(kernel_recvmsg);
 865
 866static void sock_aio_dtor(struct kiocb *iocb)
 867{
 868        kfree(iocb->private);
 869}
 870
 871static ssize_t sock_sendpage(struct file *file, struct page *page,
 872                             int offset, size_t size, loff_t *ppos, int more)
 873{
 874        struct socket *sock;
 875        int flags;
 876
 877        sock = file->private_data;
 878
 879        flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
 880        /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */
 881        flags |= more;
 882
 883        return kernel_sendpage(sock, page, offset, size, flags);
 884}
 885
 886static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
 887                                struct pipe_inode_info *pipe, size_t len,
 888                                unsigned int flags)
 889{
 890        struct socket *sock = file->private_data;
 891
 892        if (unlikely(!sock->ops->splice_read))
 893                return -EINVAL;
 894
 895        return sock->ops->splice_read(sock, ppos, pipe, len, flags);
 896}
 897
 898static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
 899                                         struct sock_iocb *siocb)
 900{
 901        if (!is_sync_kiocb(iocb)) {
 902                siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
 903                if (!siocb)
 904                        return NULL;
 905                iocb->ki_dtor = sock_aio_dtor;
 906        }
 907
 908        siocb->kiocb = iocb;
 909        iocb->private = siocb;
 910        return siocb;
 911}
 912
 913static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
 914                struct file *file, const struct iovec *iov,
 915                unsigned long nr_segs)
 916{
 917        struct socket *sock = file->private_data;
 918        size_t size = 0;
 919        int i;
 920
 921        for (i = 0; i < nr_segs; i++)
 922                size += iov[i].iov_len;
 923
 924        msg->msg_name = NULL;
 925        msg->msg_namelen = 0;
 926        msg->msg_control = NULL;
 927        msg->msg_controllen = 0;
 928        msg->msg_iov = (struct iovec *)iov;
 929        msg->msg_iovlen = nr_segs;
 930        msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
 931
 932        return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
 933}
 934
 935static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,
 936                                unsigned long nr_segs, loff_t pos)
 937{
 938        struct sock_iocb siocb, *x;
 939
 940        if (pos != 0)
 941                return -ESPIPE;
 942
 943        if (iocb->ki_left == 0) /* Match SYS5 behaviour */
 944                return 0;
 945
 946
 947        x = alloc_sock_iocb(iocb, &siocb);
 948        if (!x)
 949                return -ENOMEM;
 950        return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
 951}
 952
 953static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
 954                        struct file *file, const struct iovec *iov,
 955                        unsigned long nr_segs)
 956{
 957        struct socket *sock = file->private_data;
 958        size_t size = 0;
 959        int i;
 960
 961        for (i = 0; i < nr_segs; i++)
 962                size += iov[i].iov_len;
 963
 964        msg->msg_name = NULL;
 965        msg->msg_namelen = 0;
 966        msg->msg_control = NULL;
 967        msg->msg_controllen = 0;
 968        msg->msg_iov = (struct iovec *)iov;
 969        msg->msg_iovlen = nr_segs;
 970        msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
 971        if (sock->type == SOCK_SEQPACKET)
 972                msg->msg_flags |= MSG_EOR;
 973
 974        return __sock_sendmsg(iocb, sock, msg, size);
 975}
 976
 977static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov,
 978                          unsigned long nr_segs, loff_t pos)
 979{
 980        struct sock_iocb siocb, *x;
 981
 982        if (pos != 0)
 983                return -ESPIPE;
 984
 985        x = alloc_sock_iocb(iocb, &siocb);
 986        if (!x)
 987                return -ENOMEM;
 988
 989        return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs);
 990}
 991
 992/*
 993 * Atomic setting of ioctl hooks to avoid race
 994 * with module unload.
 995 */
 996
 997static DEFINE_MUTEX(br_ioctl_mutex);
 998static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg);
 999
1000void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *))
1001{
1002        mutex_lock(&br_ioctl_mutex);
1003        br_ioctl_hook = hook;
1004        mutex_unlock(&br_ioctl_mutex);
1005}
1006EXPORT_SYMBOL(brioctl_set);
1007
1008static DEFINE_MUTEX(vlan_ioctl_mutex);
1009static int (*vlan_ioctl_hook) (struct net *, void __user *arg);
1010
1011void vlan_ioctl_set(int (*hook) (struct net *, void __user *))
1012{
1013        mutex_lock(&vlan_ioctl_mutex);
1014        vlan_ioctl_hook = hook;
1015        mutex_unlock(&vlan_ioctl_mutex);
1016}
1017EXPORT_SYMBOL(vlan_ioctl_set);
1018
1019static DEFINE_MUTEX(dlci_ioctl_mutex);
1020static int (*dlci_ioctl_hook) (unsigned int, void __user *);
1021
1022void dlci_ioctl_set(int (*hook) (unsigned int, void __user *))
1023{
1024        mutex_lock(&dlci_ioctl_mutex);
1025        dlci_ioctl_hook = hook;
1026        mutex_unlock(&dlci_ioctl_mutex);
1027}
1028EXPORT_SYMBOL(dlci_ioctl_set);
1029
1030static long sock_do_ioctl(struct net *net, struct socket *sock,
1031                                 unsigned int cmd, unsigned long arg)
1032{
1033        int err;
1034        void __user *argp = (void __user *)arg;
1035
1036        err = sock->ops->ioctl(sock, cmd, arg);
1037
1038        /*
1039         * If this ioctl is unknown try to hand it down
1040         * to the NIC driver.
1041         */
1042        if (err == -ENOIOCTLCMD)
1043                err = dev_ioctl(net, cmd, argp);
1044
1045        return err;
1046}
1047
1048/*
1049 *      With an ioctl, arg may well be a user mode pointer, but we don't know
1050 *      what to do with it - that's up to the protocol still.
1051 */
1052
1053static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1054{
1055        struct socket *sock;
1056        struct sock *sk;
1057        void __user *argp = (void __user *)arg;
1058        int pid, err;
1059        struct net *net;
1060
1061        sock = file->private_data;
1062        sk = sock->sk;
1063        net = sock_net(sk);
1064        if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
1065                err = dev_ioctl(net, cmd, argp);
1066        } else
1067#ifdef CONFIG_WEXT_CORE
1068        if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
1069                err = dev_ioctl(net, cmd, argp);
1070        } else
1071#endif
1072                switch (cmd) {
1073                case FIOSETOWN:
1074                case SIOCSPGRP:
1075                        err = -EFAULT;
1076                        if (get_user(pid, (int __user *)argp))
1077                                break;
1078                        err = f_setown(sock->file, pid, 1);
1079                        break;
1080                case FIOGETOWN:
1081                case SIOCGPGRP:
1082                        err = put_user(f_getown(sock->file),
1083                                       (int __user *)argp);
1084                        break;
1085                case SIOCGIFBR:
1086                case SIOCSIFBR:
1087                case SIOCBRADDBR:
1088                case SIOCBRDELBR:
1089                        err = -ENOPKG;
1090                        if (!br_ioctl_hook)
1091                                request_module("bridge");
1092
1093                        mutex_lock(&br_ioctl_mutex);
1094                        if (br_ioctl_hook)
1095                                err = br_ioctl_hook(net, cmd, argp);
1096                        mutex_unlock(&br_ioctl_mutex);
1097                        break;
1098                case SIOCGIFVLAN:
1099                case SIOCSIFVLAN:
1100                        err = -ENOPKG;
1101                        if (!vlan_ioctl_hook)
1102                                request_module("8021q");
1103
1104                        mutex_lock(&vlan_ioctl_mutex);
1105                        if (vlan_ioctl_hook)
1106                                err = vlan_ioctl_hook(net, argp);
1107                        mutex_unlock(&vlan_ioctl_mutex);
1108                        break;
1109                case SIOCADDDLCI:
1110                case SIOCDELDLCI:
1111                        err = -ENOPKG;
1112                        if (!dlci_ioctl_hook)
1113                                request_module("dlci");
1114
1115                        mutex_lock(&dlci_ioctl_mutex);
1116                        if (dlci_ioctl_hook)
1117                                err = dlci_ioctl_hook(cmd, argp);
1118                        mutex_unlock(&dlci_ioctl_mutex);
1119                        break;
1120                default:
1121                        err = sock_do_ioctl(net, sock, cmd, arg);
1122                        break;
1123                }
1124        return err;
1125}
1126
1127int sock_create_lite(int family, int type, int protocol, struct socket **res)
1128{
1129        int err;
1130        struct socket *sock = NULL;
1131
1132        err = security_socket_create(family, type, protocol, 1);
1133        if (err)
1134                goto out;
1135
1136        sock = sock_alloc();
1137        if (!sock) {
1138                err = -ENOMEM;
1139                goto out;
1140        }
1141
1142        sock->type = type;
1143        err = security_socket_post_create(sock, family, type, protocol, 1);
1144        if (err)
1145                goto out_release;
1146
1147out:
1148        *res = sock;
1149        return err;
1150out_release:
1151        sock_release(sock);
1152        sock = NULL;
1153        goto out;
1154}
1155EXPORT_SYMBOL(sock_create_lite);
1156
1157/* No kernel lock held - perfect */
1158static unsigned int sock_poll(struct file *file, poll_table *wait)
1159{
1160        struct socket *sock;
1161
1162        /*
1163         *      We can't return errors to poll, so it's either yes or no.
1164         */
1165        sock = file->private_data;
1166        return sock->ops->poll(file, sock, wait);
1167}
1168
1169static int sock_mmap(struct file *file, struct vm_area_struct *vma)
1170{
1171        struct socket *sock = file->private_data;
1172
1173        return sock->ops->mmap(file, sock, vma);
1174}
1175
1176static int sock_close(struct inode *inode, struct file *filp)
1177{
1178        /*
1179         *      It was possible the inode is NULL we were
1180         *      closing an unfinished socket.
1181         */
1182
1183        if (!inode) {
1184                printk(KERN_DEBUG "sock_close: NULL inode\n");
1185                return 0;
1186        }
1187        sock_release(SOCKET_I(inode));
1188        return 0;
1189}
1190
1191/*
1192 *      Update the socket async list
1193 *
1194 *      Fasync_list locking strategy.
1195 *
1196 *      1. fasync_list is modified only under process context socket lock
1197 *         i.e. under semaphore.
1198 *      2. fasync_list is used under read_lock(&sk->sk_callback_lock)
1199 *         or under socket lock
1200 */
1201
1202static int sock_fasync(int fd, struct file *filp, int on)
1203{
1204        struct socket *sock = filp->private_data;
1205        struct sock *sk = sock->sk;
1206        struct socket_wq *wq;
1207
1208        if (sk == NULL)
1209                return -EINVAL;
1210
1211        lock_sock(sk);
1212        wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
1213        fasync_helper(fd, filp, on, &wq->fasync_list);
1214
1215        if (!wq->fasync_list)
1216                sock_reset_flag(sk, SOCK_FASYNC);
1217        else
1218                sock_set_flag(sk, SOCK_FASYNC);
1219
1220        release_sock(sk);
1221        return 0;
1222}
1223
1224/* This function may be called only under socket lock or callback_lock or rcu_lock */
1225
1226int sock_wake_async(struct socket *sock, int how, int band)
1227{
1228        struct socket_wq *wq;
1229
1230        if (!sock)
1231                return -1;
1232        rcu_read_lock();
1233        wq = rcu_dereference(sock->wq);
1234        if (!wq || !wq->fasync_list) {
1235                rcu_read_unlock();
1236                return -1;
1237        }
1238        switch (how) {
1239        case SOCK_WAKE_WAITD:
1240                if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
1241                        break;
1242                goto call_kill;
1243        case SOCK_WAKE_SPACE:
1244                if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
1245                        break;
1246                /* fall through */
1247        case SOCK_WAKE_IO:
1248call_kill:
1249                kill_fasync(&wq->fasync_list, SIGIO, band);
1250                break;
1251        case SOCK_WAKE_URG:
1252                kill_fasync(&wq->fasync_list, SIGURG, band);
1253        }
1254        rcu_read_unlock();
1255        return 0;
1256}
1257EXPORT_SYMBOL(sock_wake_async);
1258
1259int __sock_create(struct net *net, int family, int type, int protocol,
1260                         struct socket **res, int kern)
1261{
1262        int err;
1263        struct socket *sock;
1264        const struct net_proto_family *pf;
1265
1266        /*
1267         *      Check protocol is in range
1268         */
1269        if (family < 0 || family >= NPROTO)
1270                return -EAFNOSUPPORT;
1271        if (type < 0 || type >= SOCK_MAX)
1272                return -EINVAL;
1273
1274        /* Compatibility.
1275
1276           This uglymoron is moved from INET layer to here to avoid
1277           deadlock in module load.
1278         */
1279        if (family == PF_INET && type == SOCK_PACKET) {
1280                static int warned;
1281                if (!warned) {
1282                        warned = 1;
1283                        printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n",
1284                               current->comm);
1285                }
1286                family = PF_PACKET;
1287        }
1288
1289        err = security_socket_create(family, type, protocol, kern);
1290        if (err)
1291                return err;
1292
1293        /*
1294         *      Allocate the socket and allow the family to set things up. if
1295         *      the protocol is 0, the family is instructed to select an appropriate
1296         *      default.
1297         */
1298        sock = sock_alloc();
1299        if (!sock) {
1300                net_warn_ratelimited("socket: no more sockets\n");
1301                return -ENFILE; /* Not exactly a match, but its the
1302                                   closest posix thing */
1303        }
1304
1305        sock->type = type;
1306
1307#ifdef CONFIG_MODULES
1308        /* Attempt to load a protocol module if the find failed.
1309         *
1310         * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user
1311         * requested real, full-featured networking support upon configuration.
1312         * Otherwise module support will break!
1313         */
1314        if (rcu_access_pointer(net_families[family]) == NULL)
1315                request_module("net-pf-%d", family);
1316#endif
1317
1318        rcu_read_lock();
1319        pf = rcu_dereference(net_families[family]);
1320        err = -EAFNOSUPPORT;
1321        if (!pf)
1322                goto out_release;
1323
1324        /*
1325         * We will call the ->create function, that possibly is in a loadable
1326         * module, so we have to bump that loadable module refcnt first.
1327         */
1328        if (!try_module_get(pf->owner))
1329                goto out_release;
1330
1331        /* Now protected by module ref count */
1332        rcu_read_unlock();
1333
1334        err = pf->create(net, sock, protocol, kern);
1335        if (err < 0)
1336                goto out_module_put;
1337
1338        /*
1339         * Now to bump the refcnt of the [loadable] module that owns this
1340         * socket at sock_release time we decrement its refcnt.
1341         */
1342        if (!try_module_get(sock->ops->owner))
1343                goto out_module_busy;
1344
1345        /*
1346         * Now that we're done with the ->create function, the [loadable]
1347         * module can have its refcnt decremented
1348         */
1349        module_put(pf->owner);
1350        err = security_socket_post_create(sock, family, type, protocol, kern);
1351        if (err)
1352                goto out_sock_release;
1353        *res = sock;
1354
1355        return 0;
1356
1357out_module_busy:
1358        err = -EAFNOSUPPORT;
1359out_module_put:
1360        sock->ops = NULL;
1361        module_put(pf->owner);
1362out_sock_release:
1363        sock_release(sock);
1364        return err;
1365
1366out_release:
1367        rcu_read_unlock();
1368        goto out_sock_release;
1369}
1370EXPORT_SYMBOL(__sock_create);
1371
1372int sock_create(int family, int type, int protocol, struct socket **res)
1373{
1374        return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0);
1375}
1376EXPORT_SYMBOL(sock_create);
1377
1378int sock_create_kern(int family, int type, int protocol, struct socket **res)
1379{
1380        return __sock_create(&init_net, family, type, protocol, res, 1);
1381}
1382EXPORT_SYMBOL(sock_create_kern);
1383
1384SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
1385{
1386        int retval;
1387        struct socket *sock;
1388        int flags;
1389
1390        /* Check the SOCK_* constants for consistency.  */
1391        BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
1392        BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
1393        BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
1394        BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
1395
1396        flags = type & ~SOCK_TYPE_MASK;
1397        if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1398                return -EINVAL;
1399        type &= SOCK_TYPE_MASK;
1400
1401        if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1402                flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1403
1404        retval = sock_create(family, type, protocol, &sock);
1405        if (retval < 0)
1406                goto out;
1407
1408        retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
1409        if (retval < 0)
1410                goto out_release;
1411
1412out:
1413        /* It may be already another descriptor 8) Not kernel problem. */
1414        return retval;
1415
1416out_release:
1417        sock_release(sock);
1418        return retval;
1419}
1420
1421/*
1422 *      Create a pair of connected sockets.
1423 */
1424
1425SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
1426                int __user *, usockvec)
1427{
1428        struct socket *sock1, *sock2;
1429        int fd1, fd2, err;
1430        struct file *newfile1, *newfile2;
1431        int flags;
1432
1433        flags = type & ~SOCK_TYPE_MASK;
1434        if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1435                return -EINVAL;
1436        type &= SOCK_TYPE_MASK;
1437
1438        if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1439                flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1440
1441        /*
1442         * Obtain the first socket and check if the underlying protocol
1443         * supports the socketpair call.
1444         */
1445
1446        err = sock_create(family, type, protocol, &sock1);
1447        if (err < 0)
1448                goto out;
1449
1450        err = sock_create(family, type, protocol, &sock2);
1451        if (err < 0)
1452                goto out_release_1;
1453
1454        err = sock1->ops->socketpair(sock1, sock2);
1455        if (err < 0)
1456                goto out_release_both;
1457
1458        fd1 = get_unused_fd_flags(flags);
1459        if (unlikely(fd1 < 0)) {
1460                err = fd1;
1461                goto out_release_both;
1462        }
1463        fd2 = get_unused_fd_flags(flags);
1464        if (unlikely(fd2 < 0)) {
1465                err = fd2;
1466                put_unused_fd(fd1);
1467                goto out_release_both;
1468        }
1469
1470        newfile1 = sock_alloc_file(sock1, flags, NULL);
1471        if (unlikely(IS_ERR(newfile1))) {
1472                err = PTR_ERR(newfile1);
1473                put_unused_fd(fd1);
1474                put_unused_fd(fd2);
1475                goto out_release_both;
1476        }
1477
1478        newfile2 = sock_alloc_file(sock2, flags, NULL);
1479        if (IS_ERR(newfile2)) {
1480                err = PTR_ERR(newfile2);
1481                fput(newfile1);
1482                put_unused_fd(fd1);
1483                put_unused_fd(fd2);
1484                sock_release(sock2);
1485                goto out;
1486        }
1487
1488        audit_fd_pair(fd1, fd2);
1489        fd_install(fd1, newfile1);
1490        fd_install(fd2, newfile2);
1491        /* fd1 and fd2 may be already another descriptors.
1492         * Not kernel problem.
1493         */
1494
1495        err = put_user(fd1, &usockvec[0]);
1496        if (!err)
1497                err = put_user(fd2, &usockvec[1]);
1498        if (!err)
1499                return 0;
1500
1501        sys_close(fd2);
1502        sys_close(fd1);
1503        return err;
1504
1505out_release_both:
1506        sock_release(sock2);
1507out_release_1:
1508        sock_release(sock1);
1509out:
1510        return err;
1511}
1512
1513/*
1514 *      Bind a name to a socket. Nothing much to do here since it's
1515 *      the protocol's responsibility to handle the local address.
1516 *
1517 *      We move the socket address to kernel space before we call
1518 *      the protocol layer (having also checked the address is ok).
1519 */
1520
1521SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
1522{
1523        struct socket *sock;
1524        struct sockaddr_storage address;
1525        int err, fput_needed;
1526
1527        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1528        if (sock) {
1529                err = move_addr_to_kernel(umyaddr, addrlen, &address);
1530                if (err >= 0) {
1531                        err = security_socket_bind(sock,
1532                                                   (struct sockaddr *)&address,
1533                                                   addrlen);
1534                        if (!err)
1535                                err = sock->ops->bind(sock,
1536                                                      (struct sockaddr *)
1537                                                      &address, addrlen);
1538                }
1539                fput_light(sock->file, fput_needed);
1540        }
1541        return err;
1542}
1543
1544/*
1545 *      Perform a listen. Basically, we allow the protocol to do anything
1546 *      necessary for a listen, and if that works, we mark the socket as
1547 *      ready for listening.
1548 */
1549
1550SYSCALL_DEFINE2(listen, int, fd, int, backlog)
1551{
1552        struct socket *sock;
1553        int err, fput_needed;
1554        int somaxconn;
1555
1556        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1557        if (sock) {
1558                somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
1559                if ((unsigned int)backlog > somaxconn)
1560                        backlog = somaxconn;
1561
1562                err = security_socket_listen(sock, backlog);
1563                if (!err)
1564                        err = sock->ops->listen(sock, backlog);
1565
1566                fput_light(sock->file, fput_needed);
1567        }
1568        return err;
1569}
1570
1571/*
1572 *      For accept, we attempt to create a new socket, set up the link
1573 *      with the client, wake up the client, then return the new
1574 *      connected fd. We collect the address of the connector in kernel
1575 *      space and move it to user at the very end. This is unclean because
1576 *      we open the socket then return an error.
1577 *
1578 *      1003.1g adds the ability to recvmsg() to query connection pending
1579 *      status to recvmsg. We need to add that support in a way thats
1580 *      clean when we restucture accept also.
1581 */
1582
1583SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
1584                int __user *, upeer_addrlen, int, flags)
1585{
1586        struct socket *sock, *newsock;
1587        struct file *newfile;
1588        int err, len, newfd, fput_needed;
1589        struct sockaddr_storage address;
1590
1591        if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1592                return -EINVAL;
1593
1594        if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
1595                flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1596
1597        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1598        if (!sock)
1599                goto out;
1600
1601        err = -ENFILE;
1602        newsock = sock_alloc();
1603        if (!newsock)
1604                goto out_put;
1605
1606        newsock->type = sock->type;
1607        newsock->ops = sock->ops;
1608
1609        /*
1610         * We don't need try_module_get here, as the listening socket (sock)
1611         * has the protocol module (sock->ops->owner) held.
1612         */
1613        __module_get(newsock->ops->owner);
1614
1615        newfd = get_unused_fd_flags(flags);
1616        if (unlikely(newfd < 0)) {
1617                err = newfd;
1618                sock_release(newsock);
1619                goto out_put;
1620        }
1621        newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
1622        if (unlikely(IS_ERR(newfile))) {
1623                err = PTR_ERR(newfile);
1624                put_unused_fd(newfd);
1625                sock_release(newsock);
1626                goto out_put;
1627        }
1628
1629        err = security_socket_accept(sock, newsock);
1630        if (err)
1631                goto out_fd;
1632
1633        err = sock->ops->accept(sock, newsock, sock->file->f_flags);
1634        if (err < 0)
1635                goto out_fd;
1636
1637        if (upeer_sockaddr) {
1638                if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
1639                                          &len, 2) < 0) {
1640                        err = -ECONNABORTED;
1641                        goto out_fd;
1642                }
1643                err = move_addr_to_user(&address,
1644                                        len, upeer_sockaddr, upeer_addrlen);
1645                if (err < 0)
1646                        goto out_fd;
1647        }
1648
1649        /* File flags are not inherited via accept() unlike another OSes. */
1650
1651        fd_install(newfd, newfile);
1652        err = newfd;
1653
1654out_put:
1655        fput_light(sock->file, fput_needed);
1656out:
1657        return err;
1658out_fd:
1659        fput(newfile);
1660        put_unused_fd(newfd);
1661        goto out_put;
1662}
1663
1664SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
1665                int __user *, upeer_addrlen)
1666{
1667        return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0);
1668}
1669
1670/*
1671 *      Attempt to connect to a socket with the server address.  The address
1672 *      is in user space so we verify it is OK and move it to kernel space.
1673 *
1674 *      For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
1675 *      break bindings
1676 *
1677 *      NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
1678 *      other SEQPACKET protocols that take time to connect() as it doesn't
1679 *      include the -EINPROGRESS status for such sockets.
1680 */
1681
1682SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
1683                int, addrlen)
1684{
1685        struct socket *sock;
1686        struct sockaddr_storage address;
1687        int err, fput_needed;
1688
1689        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1690        if (!sock)
1691                goto out;
1692        err = move_addr_to_kernel(uservaddr, addrlen, &address);
1693        if (err < 0)
1694                goto out_put;
1695
1696        err =
1697            security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
1698        if (err)
1699                goto out_put;
1700
1701        err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
1702                                 sock->file->f_flags);
1703out_put:
1704        fput_light(sock->file, fput_needed);
1705out:
1706        return err;
1707}
1708
1709/*
1710 *      Get the local address ('name') of a socket object. Move the obtained
1711 *      name to user space.
1712 */
1713
1714SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
1715                int __user *, usockaddr_len)
1716{
1717        struct socket *sock;
1718        struct sockaddr_storage address;
1719        int len, err, fput_needed;
1720
1721        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1722        if (!sock)
1723                goto out;
1724
1725        err = security_socket_getsockname(sock);
1726        if (err)
1727                goto out_put;
1728
1729        err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
1730        if (err)
1731                goto out_put;
1732        err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
1733
1734out_put:
1735        fput_light(sock->file, fput_needed);
1736out:
1737        return err;
1738}
1739
1740/*
1741 *      Get the remote address ('name') of a socket object. Move the obtained
1742 *      name to user space.
1743 */
1744
1745SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
1746                int __user *, usockaddr_len)
1747{
1748        struct socket *sock;
1749        struct sockaddr_storage address;
1750        int len, err, fput_needed;
1751
1752        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1753        if (sock != NULL) {
1754                err = security_socket_getpeername(sock);
1755                if (err) {
1756                        fput_light(sock->file, fput_needed);
1757                        return err;
1758                }
1759
1760                err =
1761                    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1762                                       1);
1763                if (!err)
1764                        err = move_addr_to_user(&address, len, usockaddr,
1765                                                usockaddr_len);
1766                fput_light(sock->file, fput_needed);
1767        }
1768        return err;
1769}
1770
1771/*
1772 *      Send a datagram to a given address. We move the address into kernel
1773 *      space and check the user space data area is readable before invoking
1774 *      the protocol.
1775 */
1776
1777SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
1778                unsigned int, flags, struct sockaddr __user *, addr,
1779                int, addr_len)
1780{
1781        struct socket *sock;
1782        struct sockaddr_storage address;
1783        int err;
1784        struct msghdr msg;
1785        struct iovec iov;
1786        int fput_needed;
1787
1788        if (len > INT_MAX)
1789                len = INT_MAX;
1790        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1791        if (!sock)
1792                goto out;
1793
1794        iov.iov_base = buff;
1795        iov.iov_len = len;
1796        msg.msg_name = NULL;
1797        msg.msg_iov = &iov;
1798        msg.msg_iovlen = 1;
1799        msg.msg_control = NULL;
1800        msg.msg_controllen = 0;
1801        msg.msg_namelen = 0;
1802        if (addr) {
1803                err = move_addr_to_kernel(addr, addr_len, &address);
1804                if (err < 0)
1805                        goto out_put;
1806                msg.msg_name = (struct sockaddr *)&address;
1807                msg.msg_namelen = addr_len;
1808        }
1809        if (sock->file->f_flags & O_NONBLOCK)
1810                flags |= MSG_DONTWAIT;
1811        msg.msg_flags = flags;
1812        err = sock_sendmsg(sock, &msg, len);
1813
1814out_put:
1815        fput_light(sock->file, fput_needed);
1816out:
1817        return err;
1818}
1819
1820/*
1821 *      Send a datagram down a socket.
1822 */
1823
1824SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len,
1825                unsigned int, flags)
1826{
1827        return sys_sendto(fd, buff, len, flags, NULL, 0);
1828}
1829
1830/*
1831 *      Receive a frame from the socket and optionally record the address of the
1832 *      sender. We verify the buffers are writable and if needed move the
1833 *      sender address from kernel to user space.
1834 */
1835
1836SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
1837                unsigned int, flags, struct sockaddr __user *, addr,
1838                int __user *, addr_len)
1839{
1840        struct socket *sock;
1841        struct iovec iov;
1842        struct msghdr msg;
1843        struct sockaddr_storage address;
1844        int err, err2;
1845        int fput_needed;
1846
1847        if (size > INT_MAX)
1848                size = INT_MAX;
1849        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1850        if (!sock)
1851                goto out;
1852
1853        msg.msg_control = NULL;
1854        msg.msg_controllen = 0;
1855        msg.msg_iovlen = 1;
1856        msg.msg_iov = &iov;
1857        iov.iov_len = size;
1858        iov.iov_base = ubuf;
1859        msg.msg_name = (struct sockaddr *)&address;
1860        msg.msg_namelen = sizeof(address);
1861        if (sock->file->f_flags & O_NONBLOCK)
1862                flags |= MSG_DONTWAIT;
1863        err = sock_recvmsg(sock, &msg, size, flags);
1864
1865        if (err >= 0 && addr != NULL) {
1866                err2 = move_addr_to_user(&address,
1867                                         msg.msg_namelen, addr, addr_len);
1868                if (err2 < 0)
1869                        err = err2;
1870        }
1871
1872        fput_light(sock->file, fput_needed);
1873out:
1874        return err;
1875}
1876
1877/*
1878 *      Receive a datagram from a socket.
1879 */
1880
1881asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size,
1882                         unsigned int flags)
1883{
1884        return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
1885}
1886
1887/*
1888 *      Set a socket option. Because we don't know the option lengths we have
1889 *      to pass the user mode parameter for the protocols to sort out.
1890 */
1891
1892SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
1893                char __user *, optval, int, optlen)
1894{
1895        int err, fput_needed;
1896        struct socket *sock;
1897
1898        if (optlen < 0)
1899                return -EINVAL;
1900
1901        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1902        if (sock != NULL) {
1903                err = security_socket_setsockopt(sock, level, optname);
1904                if (err)
1905                        goto out_put;
1906
1907                if (level == SOL_SOCKET)
1908                        err =
1909                            sock_setsockopt(sock, level, optname, optval,
1910                                            optlen);
1911                else
1912                        err =
1913                            sock->ops->setsockopt(sock, level, optname, optval,
1914                                                  optlen);
1915out_put:
1916                fput_light(sock->file, fput_needed);
1917        }
1918        return err;
1919}
1920
1921/*
1922 *      Get a socket option. Because we don't know the option lengths we have
1923 *      to pass a user mode parameter for the protocols to sort out.
1924 */
1925
1926SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
1927                char __user *, optval, int __user *, optlen)
1928{
1929        int err, fput_needed;
1930        struct socket *sock;
1931
1932        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1933        if (sock != NULL) {
1934                err = security_socket_getsockopt(sock, level, optname);
1935                if (err)
1936                        goto out_put;
1937
1938                if (level == SOL_SOCKET)
1939                        err =
1940                            sock_getsockopt(sock, level, optname, optval,
1941                                            optlen);
1942                else
1943                        err =
1944                            sock->ops->getsockopt(sock, level, optname, optval,
1945                                                  optlen);
1946out_put:
1947                fput_light(sock->file, fput_needed);
1948        }
1949        return err;
1950}
1951
1952/*
1953 *      Shutdown a socket.
1954 */
1955
1956SYSCALL_DEFINE2(shutdown, int, fd, int, how)
1957{
1958        int err, fput_needed;
1959        struct socket *sock;
1960
1961        sock = sockfd_lookup_light(fd, &err, &fput_needed);
1962        if (sock != NULL) {
1963                err = security_socket_shutdown(sock, how);
1964                if (!err)
1965                        err = sock->ops->shutdown(sock, how);
1966                fput_light(sock->file, fput_needed);
1967        }
1968        return err;
1969}
1970
1971/* A couple of helpful macros for getting the address of the 32/64 bit
1972 * fields which are the same type (int / unsigned) on our platforms.
1973 */
1974#define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
1975#define COMPAT_NAMELEN(msg)     COMPAT_MSG(msg, msg_namelen)
1976#define COMPAT_FLAGS(msg)       COMPAT_MSG(msg, msg_flags)
1977
1978struct used_address {
1979        struct sockaddr_storage name;
1980        unsigned int name_len;
1981};
1982
1983static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
1984                         struct msghdr *msg_sys, unsigned int flags,
1985                         struct used_address *used_address)
1986{
1987        struct compat_msghdr __user *msg_compat =
1988            (struct compat_msghdr __user *)msg;
1989        struct sockaddr_storage address;
1990        struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
1991        unsigned char ctl[sizeof(struct cmsghdr) + 20]
1992            __attribute__ ((aligned(sizeof(__kernel_size_t))));
1993        /* 20 is size of ipv6_pktinfo */
1994        unsigned char *ctl_buf = ctl;
1995        int err, ctl_len, total_len;
1996
1997        err = -EFAULT;
1998        if (MSG_CMSG_COMPAT & flags) {
1999                if (get_compat_msghdr(msg_sys, msg_compat))
2000                        return -EFAULT;
2001        } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
2002                return -EFAULT;
2003
2004        if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2005                err = -EMSGSIZE;
2006                if (msg_sys->msg_iovlen > UIO_MAXIOV)
2007                        goto out;
2008                err = -ENOMEM;
2009                iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2010                              GFP_KERNEL);
2011                if (!iov)
2012                        goto out;
2013        }
2014
2015        /* This will also move the address data into kernel space */
2016        if (MSG_CMSG_COMPAT & flags) {
2017                err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
2018        } else
2019                err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
2020        if (err < 0)
2021                goto out_freeiov;
2022        total_len = err;
2023
2024        err = -ENOBUFS;
2025
2026        if (msg_sys->msg_controllen > INT_MAX)
2027                goto out_freeiov;
2028        ctl_len = msg_sys->msg_controllen;
2029        if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
2030                err =
2031                    cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
2032                                                     sizeof(ctl));
2033                if (err)
2034                        goto out_freeiov;
2035                ctl_buf = msg_sys->msg_control;
2036                ctl_len = msg_sys->msg_controllen;
2037        } else if (ctl_len) {
2038                if (ctl_len > sizeof(ctl)) {
2039                        ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
2040                        if (ctl_buf == NULL)
2041                                goto out_freeiov;
2042                }
2043                err = -EFAULT;
2044                /*
2045                 * Careful! Before this, msg_sys->msg_control contains a user pointer.
2046                 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
2047                 * checking falls down on this.
2048                 */
2049                if (copy_from_user(ctl_buf,
2050                                   (void __user __force *)msg_sys->msg_control,
2051                                   ctl_len))
2052                        goto out_freectl;
2053                msg_sys->msg_control = ctl_buf;
2054        }
2055        msg_sys->msg_flags = flags;
2056
2057        if (sock->file->f_flags & O_NONBLOCK)
2058                msg_sys->msg_flags |= MSG_DONTWAIT;
2059        /*
2060         * If this is sendmmsg() and current destination address is same as
2061         * previously succeeded address, omit asking LSM's decision.
2062         * used_address->name_len is initialized to UINT_MAX so that the first
2063         * destination address never matches.
2064         */
2065        if (used_address && msg_sys->msg_name &&
2066            used_address->name_len == msg_sys->msg_namelen &&
2067            !memcmp(&used_address->name, msg_sys->msg_name,
2068                    used_address->name_len)) {
2069                err = sock_sendmsg_nosec(sock, msg_sys, total_len);
2070                goto out_freectl;
2071        }
2072        err = sock_sendmsg(sock, msg_sys, total_len);
2073        /*
2074         * If this is sendmmsg() and sending to current destination address was
2075         * successful, remember it.
2076         */
2077        if (used_address && err >= 0) {
2078                used_address->name_len = msg_sys->msg_namelen;
2079                if (msg_sys->msg_name)
2080                        memcpy(&used_address->name, msg_sys->msg_name,
2081                               used_address->name_len);
2082        }
2083
2084out_freectl:
2085        if (ctl_buf != ctl)
2086                sock_kfree_s(sock->sk, ctl_buf, ctl_len);
2087out_freeiov:
2088        if (iov != iovstack)
2089                kfree(iov);
2090out:
2091        return err;
2092}
2093
2094/*
2095 *      BSD sendmsg interface
2096 */
2097
2098SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
2099{
2100        int fput_needed, err;
2101        struct msghdr msg_sys;
2102        struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2103
2104        if (!sock)
2105                goto out;
2106
2107        err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
2108
2109        fput_light(sock->file, fput_needed);
2110out:
2111        return err;
2112}
2113
2114/*
2115 *      Linux sendmmsg interface
2116 */
2117
2118int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2119                   unsigned int flags)
2120{
2121        int fput_needed, err, datagrams;
2122        struct socket *sock;
2123        struct mmsghdr __user *entry;
2124        struct compat_mmsghdr __user *compat_entry;
2125        struct msghdr msg_sys;
2126        struct used_address used_address;
2127
2128        if (vlen > UIO_MAXIOV)
2129                vlen = UIO_MAXIOV;
2130
2131        datagrams = 0;
2132
2133        sock = sockfd_lookup_light(fd, &err, &fput_needed);
2134        if (!sock)
2135                return err;
2136
2137        used_address.name_len = UINT_MAX;
2138        entry = mmsg;
2139        compat_entry = (struct compat_mmsghdr __user *)mmsg;
2140        err = 0;
2141
2142        while (datagrams < vlen) {
2143                if (MSG_CMSG_COMPAT & flags) {
2144                        err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
2145                                            &msg_sys, flags, &used_address);
2146                        if (err < 0)
2147                                break;
2148                        err = __put_user(err, &compat_entry->msg_len);
2149                        ++compat_entry;
2150                } else {
2151                        err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
2152                                            &msg_sys, flags, &used_address);
2153                        if (err < 0)
2154                                break;
2155                        err = put_user(err, &entry->msg_len);
2156                        ++entry;
2157                }
2158
2159                if (err)
2160                        break;
2161                ++datagrams;
2162        }
2163
2164        fput_light(sock->file, fput_needed);
2165
2166        /* We only return an error if no datagrams were able to be sent */
2167        if (datagrams != 0)
2168                return datagrams;
2169
2170        return err;
2171}
2172
2173SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
2174                unsigned int, vlen, unsigned int, flags)
2175{
2176        return __sys_sendmmsg(fd, mmsg, vlen, flags);
2177}
2178
2179static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
2180                         struct msghdr *msg_sys, unsigned int flags, int nosec)
2181{
2182        struct compat_msghdr __user *msg_compat =
2183            (struct compat_msghdr __user *)msg;
2184        struct iovec iovstack[UIO_FASTIOV];
2185        struct iovec *iov = iovstack;
2186        unsigned long cmsg_ptr;
2187        int err, total_len, len;
2188
2189        /* kernel mode address */
2190        struct sockaddr_storage addr;
2191
2192        /* user mode address pointers */
2193        struct sockaddr __user *uaddr;
2194        int __user *uaddr_len;
2195
2196        if (MSG_CMSG_COMPAT & flags) {
2197                if (get_compat_msghdr(msg_sys, msg_compat))
2198                        return -EFAULT;
2199        } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr)))
2200                return -EFAULT;
2201
2202        if (msg_sys->msg_iovlen > UIO_FASTIOV) {
2203                err = -EMSGSIZE;
2204                if (msg_sys->msg_iovlen > UIO_MAXIOV)
2205                        goto out;
2206                err = -ENOMEM;
2207                iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
2208                              GFP_KERNEL);
2209                if (!iov)
2210                        goto out;
2211        }
2212
2213        /*
2214         *      Save the user-mode address (verify_iovec will change the
2215         *      kernel msghdr to use the kernel address space)
2216         */
2217
2218        uaddr = (__force void __user *)msg_sys->msg_name;
2219        uaddr_len = COMPAT_NAMELEN(msg);
2220        if (MSG_CMSG_COMPAT & flags) {
2221                err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
2222        } else
2223                err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
2224        if (err < 0)
2225                goto out_freeiov;
2226        total_len = err;
2227
2228        cmsg_ptr = (unsigned long)msg_sys->msg_control;
2229        msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
2230
2231        if (sock->file->f_flags & O_NONBLOCK)
2232                flags |= MSG_DONTWAIT;
2233        err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
2234                                                          total_len, flags);
2235        if (err < 0)
2236                goto out_freeiov;
2237        len = err;
2238
2239        if (uaddr != NULL) {
2240                err = move_addr_to_user(&addr,
2241                                        msg_sys->msg_namelen, uaddr,
2242                                        uaddr_len);
2243                if (err < 0)
2244                        goto out_freeiov;
2245        }
2246        err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
2247                         COMPAT_FLAGS(msg));
2248        if (err)
2249                goto out_freeiov;
2250        if (MSG_CMSG_COMPAT & flags)
2251                err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2252                                 &msg_compat->msg_controllen);
2253        else
2254                err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
2255                                 &msg->msg_controllen);
2256        if (err)
2257                goto out_freeiov;
2258        err = len;
2259
2260out_freeiov:
2261        if (iov != iovstack)
2262                kfree(iov);
2263out:
2264        return err;
2265}
2266
2267/*
2268 *      BSD recvmsg interface
2269 */
2270
2271SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
2272                unsigned int, flags)
2273{
2274        int fput_needed, err;
2275        struct msghdr msg_sys;
2276        struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed);
2277
2278        if (!sock)
2279                goto out;
2280
2281        err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
2282
2283        fput_light(sock->file, fput_needed);
2284out:
2285        return err;
2286}
2287
2288/*
2289 *     Linux recvmmsg interface
2290 */
2291
2292int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
2293                   unsigned int flags, struct timespec *timeout)
2294{
2295        int fput_needed, err, datagrams;
2296        struct socket *sock;
2297        struct mmsghdr __user *entry;
2298        struct compat_mmsghdr __user *compat_entry;
2299        struct msghdr msg_sys;
2300        struct timespec end_time;
2301
2302        if (timeout &&
2303            poll_select_set_timeout(&end_time, timeout->tv_sec,
2304                                    timeout->tv_nsec))
2305                return -EINVAL;
2306
2307        datagrams = 0;
2308
2309        sock = sockfd_lookup_light(fd, &err, &fput_needed);
2310        if (!sock)
2311                return err;
2312
2313        err = sock_error(sock->sk);
2314        if (err)
2315                goto out_put;
2316
2317        entry = mmsg;
2318        compat_entry = (struct compat_mmsghdr __user *)mmsg;
2319
2320        while (datagrams < vlen) {
2321                /*
2322                 * No need to ask LSM for more than the first datagram.
2323                 */
2324                if (MSG_CMSG_COMPAT & flags) {
2325                        err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
2326                                            &msg_sys, flags & ~MSG_WAITFORONE,
2327                                            datagrams);
2328                        if (err < 0)
2329                                break;
2330                        err = __put_user(err, &compat_entry->msg_len);
2331                        ++compat_entry;
2332                } else {
2333                        err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
2334                                            &msg_sys, flags & ~MSG_WAITFORONE,
2335                                            datagrams);
2336                        if (err < 0)
2337                                break;
2338                        err = put_user(err, &entry->msg_len);
2339                        ++entry;
2340                }
2341
2342                if (err)
2343                        break;
2344                ++datagrams;
2345
2346                /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */
2347                if (flags & MSG_WAITFORONE)
2348                        flags |= MSG_DONTWAIT;
2349
2350                if (timeout) {
2351                        ktime_get_ts(timeout);
2352                        *timeout = timespec_sub(end_time, *timeout);
2353                        if (timeout->tv_sec < 0) {
2354                                timeout->tv_sec = timeout->tv_nsec = 0;
2355                                break;
2356                        }
2357
2358                        /* Timeout, return less than vlen datagrams */
2359                        if (timeout->tv_nsec == 0 && timeout->tv_sec == 0)
2360                                break;
2361                }
2362
2363                /* Out of band data, return right away */
2364                if (msg_sys.msg_flags & MSG_OOB)
2365                        break;
2366        }
2367
2368out_put:
2369        fput_light(sock->file, fput_needed);
2370
2371        if (err == 0)
2372                return datagrams;
2373
2374        if (datagrams != 0) {
2375                /*
2376                 * We may return less entries than requested (vlen) if the
2377                 * sock is non block and there aren't enough datagrams...
2378                 */
2379                if (err != -EAGAIN) {
2380                        /*
2381                         * ... or  if recvmsg returns an error after we
2382                         * received some datagrams, where we record the
2383                         * error to return on the next call or if the
2384                         * app asks about it using getsockopt(SO_ERROR).
2385                         */
2386                        sock->sk->sk_err = -err;
2387                }
2388
2389                return datagrams;
2390        }
2391
2392        return err;
2393}
2394
2395SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,
2396                unsigned int, vlen, unsigned int, flags,
2397                struct timespec __user *, timeout)
2398{
2399        int datagrams;
2400        struct timespec timeout_sys;
2401
2402        if (!timeout)
2403                return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL);
2404
2405        if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys)))
2406                return -EFAULT;
2407
2408        datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys);
2409
2410        if (datagrams > 0 &&
2411            copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys)))
2412                datagrams = -EFAULT;
2413
2414        return datagrams;
2415}
2416
2417#ifdef __ARCH_WANT_SYS_SOCKETCALL
2418/* Argument list sizes for sys_socketcall */
2419#define AL(x) ((x) * sizeof(unsigned long))
2420static const unsigned char nargs[21] = {
2421        AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
2422        AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
2423        AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
2424        AL(4), AL(5), AL(4)
2425};
2426
2427#undef AL
2428
2429/*
2430 *      System call vectors.
2431 *
2432 *      Argument checking cleaned up. Saved 20% in size.
2433 *  This function doesn't need to set the kernel lock because
2434 *  it is set by the callees.
2435 */
2436
2437SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
2438{
2439        unsigned long a[6];
2440        unsigned long a0, a1;
2441        int err;
2442        unsigned int len;
2443
2444        if (call < 1 || call > SYS_SENDMMSG)
2445                return -EINVAL;
2446
2447        len = nargs[call];
2448        if (len > sizeof(a))
2449                return -EINVAL;
2450
2451        /* copy_from_user should be SMP safe. */
2452        if (copy_from_user(a, args, len))
2453                return -EFAULT;
2454
2455        audit_socketcall(nargs[call] / sizeof(unsigned long), a);
2456
2457        a0 = a[0];
2458        a1 = a[1];
2459
2460        switch (call) {
2461        case SYS_SOCKET:
2462                err = sys_socket(a0, a1, a[2]);
2463                break;
2464        case SYS_BIND:
2465                err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
2466                break;
2467        case SYS_CONNECT:
2468                err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
2469                break;
2470        case SYS_LISTEN:
2471                err = sys_listen(a0, a1);
2472                break;
2473        case SYS_ACCEPT:
2474                err = sys_accept4(a0, (struct sockaddr __user *)a1,
2475                                  (int __user *)a[2], 0);
2476                break;
2477        case SYS_GETSOCKNAME:
2478                err =
2479                    sys_getsockname(a0, (struct sockaddr __user *)a1,
2480                                    (int __user *)a[2]);
2481                break;
2482        case SYS_GETPEERNAME:
2483                err =
2484                    sys_getpeername(a0, (struct sockaddr __user *)a1,
2485                                    (int __user *)a[2]);
2486                break;
2487        case SYS_SOCKETPAIR:
2488                err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
2489                break;
2490        case SYS_SEND:
2491                err = sys_send(a0, (void __user *)a1, a[2], a[3]);
2492                break;
2493        case SYS_SENDTO:
2494                err = sys_sendto(a0, (void __user *)a1, a[2], a[3],
2495                                 (struct sockaddr __user *)a[4], a[5]);
2496                break;
2497        case SYS_RECV:
2498                err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
2499                break;
2500        case SYS_RECVFROM:
2501                err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
2502                                   (struct sockaddr __user *)a[4],
2503                                   (int __user *)a[5]);
2504                break;
2505        case SYS_SHUTDOWN:
2506                err = sys_shutdown(a0, a1);
2507                break;
2508        case SYS_SETSOCKOPT:
2509                err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
2510                break;
2511        case SYS_GETSOCKOPT:
2512                err =
2513                    sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
2514                                   (int __user *)a[4]);
2515                break;
2516        case SYS_SENDMSG:
2517                err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
2518                break;
2519        case SYS_SENDMMSG:
2520                err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
2521                break;
2522        case SYS_RECVMSG:
2523                err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
2524                break;
2525        case SYS_RECVMMSG:
2526                err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
2527                                   (struct timespec __user *)a[4]);
2528                break;
2529        case SYS_ACCEPT4:
2530                err = sys_accept4(a0, (struct sockaddr __user *)a1,
2531                                  (int __user *)a[2], a[3]);
2532                break;
2533        default:
2534                err = -EINVAL;
2535                break;
2536        }
2537        return err;
2538}
2539
2540#endif                          /* __ARCH_WANT_SYS_SOCKETCALL */
2541
2542/**
2543 *      sock_register - add a socket protocol handler
2544 *      @ops: description of protocol
2545 *
2546 *      This function is called by a protocol handler that wants to
2547 *      advertise its address family, and have it linked into the
2548 *      socket interface. The value ops->family coresponds to the
2549 *      socket system call protocol family.
2550 */
2551int sock_register(const struct net_proto_family *ops)
2552{
2553        int err;
2554
2555        if (ops->family >= NPROTO) {
2556                printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family,
2557                       NPROTO);
2558                return -ENOBUFS;
2559        }
2560
2561        spin_lock(&net_family_lock);
2562        if (rcu_dereference_protected(net_families[ops->family],
2563                                      lockdep_is_held(&net_family_lock)))
2564                err = -EEXIST;
2565        else {
2566                rcu_assign_pointer(net_families[ops->family], ops);
2567                err = 0;
2568        }
2569        spin_unlock(&net_family_lock);
2570
2571        printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family);
2572        return err;
2573}
2574EXPORT_SYMBOL(sock_register);
2575
2576/**
2577 *      sock_unregister - remove a protocol handler
2578 *      @family: protocol family to remove
2579 *
2580 *      This function is called by a protocol handler that wants to
2581 *      remove its address family, and have it unlinked from the
2582 *      new socket creation.
2583 *
2584 *      If protocol handler is a module, then it can use module reference
2585 *      counts to protect against new references. If protocol handler is not
2586 *      a module then it needs to provide its own protection in
2587 *      the ops->create routine.
2588 */
2589void sock_unregister(int family)
2590{
2591        BUG_ON(family < 0 || family >= NPROTO);
2592
2593        spin_lock(&net_family_lock);
2594        RCU_INIT_POINTER(net_families[family], NULL);
2595        spin_unlock(&net_family_lock);
2596
2597        synchronize_rcu();
2598
2599        printk(KERN_INFO "NET: Unregistered protocol family %d\n", family);
2600}
2601EXPORT_SYMBOL(sock_unregister);
2602
2603static int __init sock_init(void)
2604{
2605        int err;
2606        /*
2607         *      Initialize the network sysctl infrastructure.
2608         */
2609        err = net_sysctl_init();
2610        if (err)
2611                goto out;
2612
2613        /*
2614         *      Initialize skbuff SLAB cache
2615         */
2616        skb_init();
2617
2618        /*
2619         *      Initialize the protocols module.
2620         */
2621
2622        init_inodecache();
2623
2624        err = register_filesystem(&sock_fs_type);
2625        if (err)
2626                goto out_fs;
2627        sock_mnt = kern_mount(&sock_fs_type);
2628        if (IS_ERR(sock_mnt)) {
2629                err = PTR_ERR(sock_mnt);
2630                goto out_mount;
2631        }
2632
2633        /* The real protocol initialization is performed in later initcalls.
2634         */
2635
2636#ifdef CONFIG_NETFILTER
2637        netfilter_init();
2638#endif
2639
2640#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
2641        skb_timestamping_init();
2642#endif
2643
2644out:
2645        return err;
2646
2647out_mount:
2648        unregister_filesystem(&sock_fs_type);
2649out_fs:
2650        goto out;
2651}
2652
2653core_initcall(sock_init);       /* early initcall */
2654
2655#ifdef CONFIG_PROC_FS
2656void socket_seq_show(struct seq_file *seq)
2657{
2658        int cpu;
2659        int counter = 0;
2660
2661        for_each_possible_cpu(cpu)
2662            counter += per_cpu(sockets_in_use, cpu);
2663
2664        /* It can be negative, by the way. 8) */
2665        if (counter < 0)
2666                counter = 0;
2667
2668        seq_printf(seq, "sockets: used %d\n", counter);
2669}
2670#endif                          /* CONFIG_PROC_FS */
2671
2672#ifdef CONFIG_COMPAT
2673static int do_siocgstamp(struct net *net, struct socket *sock,
2674                         unsigned int cmd, void __user *up)
2675{
2676        mm_segment_t old_fs = get_fs();
2677        struct timeval ktv;
2678        int err;
2679
2680        set_fs(KERNEL_DS);
2681        err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv);
2682        set_fs(old_fs);
2683        if (!err)
2684                err = compat_put_timeval(&ktv, up);
2685
2686        return err;
2687}
2688
2689static int do_siocgstampns(struct net *net, struct socket *sock,
2690                           unsigned int cmd, void __user *up)
2691{
2692        mm_segment_t old_fs = get_fs();
2693        struct timespec kts;
2694        int err;
2695
2696        set_fs(KERNEL_DS);
2697        err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts);
2698        set_fs(old_fs);
2699        if (!err)
2700                err = compat_put_timespec(&kts, up);
2701
2702        return err;
2703}
2704
2705static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32)
2706{
2707        struct ifreq __user *uifr;
2708        int err;
2709
2710        uifr = compat_alloc_user_space(sizeof(struct ifreq));
2711        if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2712                return -EFAULT;
2713
2714        err = dev_ioctl(net, SIOCGIFNAME, uifr);
2715        if (err)
2716                return err;
2717
2718        if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq)))
2719                return -EFAULT;
2720
2721        return 0;
2722}
2723
2724static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
2725{
2726        struct compat_ifconf ifc32;
2727        struct ifconf ifc;
2728        struct ifconf __user *uifc;
2729        struct compat_ifreq __user *ifr32;
2730        struct ifreq __user *ifr;
2731        unsigned int i, j;
2732        int err;
2733
2734        if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf)))
2735                return -EFAULT;
2736
2737        memset(&ifc, 0, sizeof(ifc));
2738        if (ifc32.ifcbuf == 0) {
2739                ifc32.ifc_len = 0;
2740                ifc.ifc_len = 0;
2741                ifc.ifc_req = NULL;
2742                uifc = compat_alloc_user_space(sizeof(struct ifconf));
2743        } else {
2744                size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) *
2745                        sizeof(struct ifreq);
2746                uifc = compat_alloc_user_space(sizeof(struct ifconf) + len);
2747                ifc.ifc_len = len;
2748                ifr = ifc.ifc_req = (void __user *)(uifc + 1);
2749                ifr32 = compat_ptr(ifc32.ifcbuf);
2750                for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) {
2751                        if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq)))
2752                                return -EFAULT;
2753                        ifr++;
2754                        ifr32++;
2755                }
2756        }
2757        if (copy_to_user(uifc, &ifc, sizeof(struct ifconf)))
2758                return -EFAULT;
2759
2760        err = dev_ioctl(net, SIOCGIFCONF, uifc);
2761        if (err)
2762                return err;
2763
2764        if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
2765                return -EFAULT;
2766
2767        ifr = ifc.ifc_req;
2768        ifr32 = compat_ptr(ifc32.ifcbuf);
2769        for (i = 0, j = 0;
2770             i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len;
2771             i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) {
2772                if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq)))
2773                        return -EFAULT;
2774                ifr32++;
2775                ifr++;
2776        }
2777
2778        if (ifc32.ifcbuf == 0) {
2779                /* Translate from 64-bit structure multiple to
2780                 * a 32-bit one.
2781                 */
2782                i = ifc.ifc_len;
2783                i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq));
2784                ifc32.ifc_len = i;
2785        } else {
2786                ifc32.ifc_len = i;
2787        }
2788        if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf)))
2789                return -EFAULT;
2790
2791        return 0;
2792}
2793
2794static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
2795{
2796        struct compat_ethtool_rxnfc __user *compat_rxnfc;
2797        bool convert_in = false, convert_out = false;
2798        size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
2799        struct ethtool_rxnfc __user *rxnfc;
2800        struct ifreq __user *ifr;
2801        u32 rule_cnt = 0, actual_rule_cnt;
2802        u32 ethcmd;
2803        u32 data;
2804        int ret;
2805
2806        if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2807                return -EFAULT;
2808
2809        compat_rxnfc = compat_ptr(data);
2810
2811        if (get_user(ethcmd, &compat_rxnfc->cmd))
2812                return -EFAULT;
2813
2814        /* Most ethtool structures are defined without padding.
2815         * Unfortunately struct ethtool_rxnfc is an exception.
2816         */
2817        switch (ethcmd) {
2818        default:
2819                break;
2820        case ETHTOOL_GRXCLSRLALL:
2821                /* Buffer size is variable */
2822                if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
2823                        return -EFAULT;
2824                if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
2825                        return -ENOMEM;
2826                buf_size += rule_cnt * sizeof(u32);
2827                /* fall through */
2828        case ETHTOOL_GRXRINGS:
2829        case ETHTOOL_GRXCLSRLCNT:
2830        case ETHTOOL_GRXCLSRULE:
2831        case ETHTOOL_SRXCLSRLINS:
2832                convert_out = true;
2833                /* fall through */
2834        case ETHTOOL_SRXCLSRLDEL:
2835                buf_size += sizeof(struct ethtool_rxnfc);
2836                convert_in = true;
2837                break;
2838        }
2839
2840        ifr = compat_alloc_user_space(buf_size);
2841        rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);
2842
2843        if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2844                return -EFAULT;
2845
2846        if (put_user(convert_in ? rxnfc : compat_ptr(data),
2847                     &ifr->ifr_ifru.ifru_data))
2848                return -EFAULT;
2849
2850        if (convert_in) {
2851                /* We expect there to be holes between fs.m_ext and
2852                 * fs.ring_cookie and at the end of fs, but nowhere else.
2853                 */
2854                BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) +
2855                             sizeof(compat_rxnfc->fs.m_ext) !=
2856                             offsetof(struct ethtool_rxnfc, fs.m_ext) +
2857                             sizeof(rxnfc->fs.m_ext));
2858                BUILD_BUG_ON(
2859                        offsetof(struct compat_ethtool_rxnfc, fs.location) -
2860                        offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
2861                        offsetof(struct ethtool_rxnfc, fs.location) -
2862                        offsetof(struct ethtool_rxnfc, fs.ring_cookie));
2863
2864                if (copy_in_user(rxnfc, compat_rxnfc,
2865                                 (void *)(&rxnfc->fs.m_ext + 1) -
2866                                 (void *)rxnfc) ||
2867                    copy_in_user(&rxnfc->fs.ring_cookie,
2868                                 &compat_rxnfc->fs.ring_cookie,
2869                                 (void *)(&rxnfc->fs.location + 1) -
2870                                 (void *)&rxnfc->fs.ring_cookie) ||
2871                    copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
2872                                 sizeof(rxnfc->rule_cnt)))
2873                        return -EFAULT;
2874        }
2875
2876        ret = dev_ioctl(net, SIOCETHTOOL, ifr);
2877        if (ret)
2878                return ret;
2879
2880        if (convert_out) {
2881                if (copy_in_user(compat_rxnfc, rxnfc,
2882                                 (const void *)(&rxnfc->fs.m_ext + 1) -
2883                                 (const void *)rxnfc) ||
2884                    copy_in_user(&compat_rxnfc->fs.ring_cookie,
2885                                 &rxnfc->fs.ring_cookie,
2886                                 (const void *)(&rxnfc->fs.location + 1) -
2887                                 (const void *)&rxnfc->fs.ring_cookie) ||
2888                    copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
2889                                 sizeof(rxnfc->rule_cnt)))
2890                        return -EFAULT;
2891
2892                if (ethcmd == ETHTOOL_GRXCLSRLALL) {
2893                        /* As an optimisation, we only copy the actual
2894                         * number of rules that the underlying
2895                         * function returned.  Since Mallory might
2896                         * change the rule count in user memory, we
2897                         * check that it is less than the rule count
2898                         * originally given (as the user buffer size),
2899                         * which has been range-checked.
2900                         */
2901                        if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
2902                                return -EFAULT;
2903                        if (actual_rule_cnt < rule_cnt)
2904                                rule_cnt = actual_rule_cnt;
2905                        if (copy_in_user(&compat_rxnfc->rule_locs[0],
2906                                         &rxnfc->rule_locs[0],
2907                                         rule_cnt * sizeof(u32)))
2908                                return -EFAULT;
2909                }
2910        }
2911
2912        return 0;
2913}
2914
2915static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
2916{
2917        void __user *uptr;
2918        compat_uptr_t uptr32;
2919        struct ifreq __user *uifr;
2920
2921        uifr = compat_alloc_user_space(sizeof(*uifr));
2922        if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
2923                return -EFAULT;
2924
2925        if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu))
2926                return -EFAULT;
2927
2928        uptr = compat_ptr(uptr32);
2929
2930        if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc))
2931                return -EFAULT;
2932
2933        return dev_ioctl(net, SIOCWANDEV, uifr);
2934}
2935
2936static int bond_ioctl(struct net *net, unsigned int cmd,
2937                         struct compat_ifreq __user *ifr32)
2938{
2939        struct ifreq kifr;
2940        struct ifreq __user *uifr;
2941        mm_segment_t old_fs;
2942        int err;
2943        u32 data;
2944        void __user *datap;
2945
2946        switch (cmd) {
2947        case SIOCBONDENSLAVE:
2948        case SIOCBONDRELEASE:
2949        case SIOCBONDSETHWADDR:
2950        case SIOCBONDCHANGEACTIVE:
2951                if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq)))
2952                        return -EFAULT;
2953
2954                old_fs = get_fs();
2955                set_fs(KERNEL_DS);
2956                err = dev_ioctl(net, cmd,
2957                                (struct ifreq __user __force *) &kifr);
2958                set_fs(old_fs);
2959
2960                return err;
2961        case SIOCBONDSLAVEINFOQUERY:
2962        case SIOCBONDINFOQUERY:
2963                uifr = compat_alloc_user_space(sizeof(*uifr));
2964                if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
2965                        return -EFAULT;
2966
2967                if (get_user(data, &ifr32->ifr_ifru.ifru_data))
2968                        return -EFAULT;
2969
2970                datap = compat_ptr(data);
2971                if (put_user(datap, &uifr->ifr_ifru.ifru_data))
2972                        return -EFAULT;
2973
2974                return dev_ioctl(net, cmd, uifr);
2975        default:
2976                return -ENOIOCTLCMD;
2977        }
2978}
2979
2980static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
2981                                 struct compat_ifreq __user *u_ifreq32)
2982{
2983        struct ifreq __user *u_ifreq64;
2984        char tmp_buf[IFNAMSIZ];
2985        void __user *data64;
2986        u32 data32;
2987
2988        if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
2989                           IFNAMSIZ))
2990                return -EFAULT;
2991        if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
2992                return -EFAULT;
2993        data64 = compat_ptr(data32);
2994
2995        u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
2996
2997        /* Don't check these user accesses, just let that get trapped
2998         * in the ioctl handler instead.
2999         */
3000        if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
3001                         IFNAMSIZ))
3002                return -EFAULT;
3003        if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
3004                return -EFAULT;
3005
3006        return dev_ioctl(net, cmd, u_ifreq64);
3007}
3008
3009static int dev_ifsioc(struct net *net, struct socket *sock,
3010                         unsigned int cmd, struct compat_ifreq __user *uifr32)
3011{
3012        struct ifreq __user *uifr;
3013        int err;
3014
3015        uifr = compat_alloc_user_space(sizeof(*uifr));
3016        if (copy_in_user(uifr, uifr32, sizeof(*uifr32)))
3017                return -EFAULT;
3018
3019        err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr);
3020
3021        if (!err) {
3022                switch (cmd) {
3023                case SIOCGIFFLAGS:
3024                case SIOCGIFMETRIC:
3025                case SIOCGIFMTU:
3026                case SIOCGIFMEM:
3027                case SIOCGIFHWADDR:
3028                case SIOCGIFINDEX:
3029                case SIOCGIFADDR:
3030                case SIOCGIFBRDADDR:
3031                case SIOCGIFDSTADDR:
3032                case SIOCGIFNETMASK:
3033                case SIOCGIFPFLAGS:
3034                case SIOCGIFTXQLEN:
3035                case SIOCGMIIPHY:
3036                case SIOCGMIIREG:
3037                        if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
3038                                err = -EFAULT;
3039                        break;
3040                }
3041        }
3042        return err;
3043}
3044
3045static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
3046                        struct compat_ifreq __user *uifr32)
3047{
3048        struct ifreq ifr;
3049        struct compat_ifmap __user *uifmap32;
3050        mm_segment_t old_fs;
3051        int err;
3052
3053        uifmap32 = &uifr32->ifr_ifru.ifru_map;
3054        err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name));
3055        err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3056        err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3057        err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3058        err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq);
3059        err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma);
3060        err |= __get_user(ifr.ifr_map.port, &uifmap32->port);
3061        if (err)
3062                return -EFAULT;
3063
3064        old_fs = get_fs();
3065        set_fs(KERNEL_DS);
3066        err = dev_ioctl(net, cmd, (void  __user __force *)&ifr);
3067        set_fs(old_fs);
3068
3069        if (cmd == SIOCGIFMAP && !err) {
3070                err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name));
3071                err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start);
3072                err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end);
3073                err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr);
3074                err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq);
3075                err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma);
3076                err |= __put_user(ifr.ifr_map.port, &uifmap32->port);
3077                if (err)
3078                        err = -EFAULT;
3079        }
3080        return err;
3081}
3082
3083static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32)
3084{
3085        void __user *uptr;
3086        compat_uptr_t uptr32;
3087        struct ifreq __user *uifr;
3088
3089        uifr = compat_alloc_user_space(sizeof(*uifr));
3090        if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq)))
3091                return -EFAULT;
3092
3093        if (get_user(uptr32, &uifr32->ifr_data))
3094                return -EFAULT;
3095
3096        uptr = compat_ptr(uptr32);
3097
3098        if (put_user(uptr, &uifr->ifr_data))
3099                return -EFAULT;
3100
3101        return dev_ioctl(net, SIOCSHWTSTAMP, uifr);
3102}
3103
3104struct rtentry32 {
3105        u32             rt_pad1;
3106        struct sockaddr rt_dst;         /* target address               */
3107        struct sockaddr rt_gateway;     /* gateway addr (RTF_GATEWAY)   */
3108        struct sockaddr rt_genmask;     /* target network mask (IP)     */
3109        unsigned short  rt_flags;
3110        short           rt_pad2;
3111        u32             rt_pad3;
3112        unsigned char   rt_tos;
3113        unsigned char   rt_class;
3114        short           rt_pad4;
3115        short           rt_metric;      /* +1 for binary compatibility! */
3116        /* char * */ u32 rt_dev;        /* forcing the device at add    */
3117        u32             rt_mtu;         /* per route MTU/Window         */
3118        u32             rt_window;      /* Window clamping              */
3119        unsigned short  rt_irtt;        /* Initial RTT                  */
3120};
3121
3122struct in6_rtmsg32 {
3123        struct in6_addr         rtmsg_dst;
3124        struct in6_addr         rtmsg_src;
3125        struct in6_addr         rtmsg_gateway;
3126        u32                     rtmsg_type;
3127        u16                     rtmsg_dst_len;
3128        u16                     rtmsg_src_len;
3129        u32                     rtmsg_metric;
3130        u32                     rtmsg_info;
3131        u32                     rtmsg_flags;
3132        s32                     rtmsg_ifindex;
3133};
3134
3135static int routing_ioctl(struct net *net, struct socket *sock,
3136                         unsigned int cmd, void __user *argp)
3137{
3138        int ret;
3139        void *r = NULL;
3140        struct in6_rtmsg r6;
3141        struct rtentry r4;
3142        char devname[16];
3143        u32 rtdev;
3144        mm_segment_t old_fs = get_fs();
3145
3146        if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
3147                struct in6_rtmsg32 __user *ur6 = argp;
3148                ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
3149                        3 * sizeof(struct in6_addr));
3150                ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
3151                ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
3152                ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
3153                ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
3154                ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
3155                ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
3156                ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
3157
3158                r = (void *) &r6;
3159        } else { /* ipv4 */
3160                struct rtentry32 __user *ur4 = argp;
3161                ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3162                                        3 * sizeof(struct sockaddr));
3163                ret |= __get_user(r4.rt_flags, &(ur4->rt_flags));
3164                ret |= __get_user(r4.rt_metric, &(ur4->rt_metric));
3165                ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu));
3166                ret |= __get_user(r4.rt_window, &(ur4->rt_window));
3167                ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt));
3168                ret |= __get_user(rtdev, &(ur4->rt_dev));
3169                if (rtdev) {
3170                        ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
3171                        r4.rt_dev = (char __user __force *)devname;
3172                        devname[15] = 0;
3173                } else
3174                        r4.rt_dev = NULL;
3175
3176                r = (void *) &r4;
3177        }
3178
3179        if (ret) {
3180                ret = -EFAULT;
3181                goto out;
3182        }
3183
3184        set_fs(KERNEL_DS);
3185        ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
3186        set_fs(old_fs);
3187
3188out:
3189        return ret;
3190}
3191
3192/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
3193 * for some operations; this forces use of the newer bridge-utils that
3194 * use compatible ioctls
3195 */
3196static int old_bridge_ioctl(compat_ulong_t __user *argp)
3197{
3198        compat_ulong_t tmp;
3199
3200        if (get_user(tmp, argp))
3201                return -EFAULT;
3202        if (tmp == BRCTL_GET_VERSION)
3203                return BRCTL_VERSION + 1;
3204        return -EINVAL;
3205}
3206
3207static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
3208                         unsigned int cmd, unsigned long arg)
3209{
3210        void __user *argp = compat_ptr(arg);
3211        struct sock *sk = sock->sk;
3212        struct net *net = sock_net(sk);
3213
3214        if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))
3215                return siocdevprivate_ioctl(net, cmd, argp);
3216
3217        switch (cmd) {
3218        case SIOCSIFBR:
3219        case SIOCGIFBR:
3220                return old_bridge_ioctl(argp);
3221        case SIOCGIFNAME:
3222                return dev_ifname32(net, argp);
3223        case SIOCGIFCONF:
3224                return dev_ifconf(net, argp);
3225        case SIOCETHTOOL:
3226                return ethtool_ioctl(net, argp);
3227        case SIOCWANDEV:
3228                return compat_siocwandev(net, argp);
3229        case SIOCGIFMAP:
3230        case SIOCSIFMAP:
3231                return compat_sioc_ifmap(net, cmd, argp);
3232        case SIOCBONDENSLAVE:
3233        case SIOCBONDRELEASE:
3234        case SIOCBONDSETHWADDR:
3235        case SIOCBONDSLAVEINFOQUERY:
3236        case SIOCBONDINFOQUERY:
3237        case SIOCBONDCHANGEACTIVE:
3238                return bond_ioctl(net, cmd, argp);
3239        case SIOCADDRT:
3240        case SIOCDELRT:
3241                return routing_ioctl(net, sock, cmd, argp);
3242        case SIOCGSTAMP:
3243                return do_siocgstamp(net, sock, cmd, argp);
3244        case SIOCGSTAMPNS:
3245                return do_siocgstampns(net, sock, cmd, argp);
3246        case SIOCSHWTSTAMP:
3247                return compat_siocshwtstamp(net, argp);
3248
3249        case FIOSETOWN:
3250        case SIOCSPGRP:
3251        case FIOGETOWN:
3252        case SIOCGPGRP:
3253        case SIOCBRADDBR:
3254        case SIOCBRDELBR:
3255        case SIOCGIFVLAN:
3256        case SIOCSIFVLAN:
3257        case SIOCADDDLCI:
3258        case SIOCDELDLCI:
3259                return sock_ioctl(file, cmd, arg);
3260
3261        case SIOCGIFFLAGS:
3262        case SIOCSIFFLAGS:
3263        case SIOCGIFMETRIC:
3264        case SIOCSIFMETRIC:
3265        case SIOCGIFMTU:
3266        case SIOCSIFMTU:
3267        case SIOCGIFMEM:
3268        case SIOCSIFMEM:
3269        case SIOCGIFHWADDR:
3270        case SIOCSIFHWADDR:
3271        case SIOCADDMULTI:
3272        case SIOCDELMULTI:
3273        case SIOCGIFINDEX:
3274        case SIOCGIFADDR:
3275        case SIOCSIFADDR:
3276        case SIOCSIFHWBROADCAST:
3277        case SIOCDIFADDR:
3278        case SIOCGIFBRDADDR:
3279        case SIOCSIFBRDADDR:
3280        case SIOCGIFDSTADDR:
3281        case SIOCSIFDSTADDR:
3282        case SIOCGIFNETMASK:
3283        case SIOCSIFNETMASK:
3284        case SIOCSIFPFLAGS:
3285        case SIOCGIFPFLAGS:
3286        case SIOCGIFTXQLEN:
3287        case SIOCSIFTXQLEN:
3288        case SIOCBRADDIF:
3289        case SIOCBRDELIF:
3290        case SIOCSIFNAME:
3291        case SIOCGMIIPHY:
3292        case SIOCGMIIREG:
3293        case SIOCSMIIREG:
3294                return dev_ifsioc(net, sock, cmd, argp);
3295
3296        case SIOCSARP:
3297        case SIOCGARP:
3298        case SIOCDARP:
3299        case SIOCATMARK:
3300                return sock_do_ioctl(net, sock, cmd, arg);
3301        }
3302
3303        return -ENOIOCTLCMD;
3304}
3305
3306static long compat_sock_ioctl(struct file *file, unsigned int cmd,
3307                              unsigned long arg)
3308{
3309        struct socket *sock = file->private_data;
3310        int ret = -ENOIOCTLCMD;
3311        struct sock *sk;
3312        struct net *net;
3313
3314        sk = sock->sk;
3315        net = sock_net(sk);
3316
3317        if (sock->ops->compat_ioctl)
3318                ret = sock->ops->compat_ioctl(sock, cmd, arg);
3319
3320        if (ret == -ENOIOCTLCMD &&
3321            (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST))
3322                ret = compat_wext_handle_ioctl(net, cmd, arg);
3323
3324        if (ret == -ENOIOCTLCMD)
3325                ret = compat_sock_ioctl_trans(file, sock, cmd, arg);
3326
3327        return ret;
3328}
3329#endif
3330
3331int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
3332{
3333        return sock->ops->bind(sock, addr, addrlen);
3334}
3335EXPORT_SYMBOL(kernel_bind);
3336
3337int kernel_listen(struct socket *sock, int backlog)
3338{
3339        return sock->ops->listen(sock, backlog);
3340}
3341EXPORT_SYMBOL(kernel_listen);
3342
3343int kernel_accept(struct socket *sock, struct socket **newsock, int flags)
3344{
3345        struct sock *sk = sock->sk;
3346        int err;
3347
3348        err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
3349                               newsock);
3350        if (err < 0)
3351                goto done;
3352
3353        err = sock->ops->accept(sock, *newsock, flags);
3354        if (err < 0) {
3355                sock_release(*newsock);
3356                *newsock = NULL;
3357                goto done;
3358        }
3359
3360        (*newsock)->ops = sock->ops;
3361        __module_get((*newsock)->ops->owner);
3362
3363done:
3364        return err;
3365}
3366EXPORT_SYMBOL(kernel_accept);
3367
3368int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
3369                   int flags)
3370{
3371        return sock->ops->connect(sock, addr, addrlen, flags);
3372}
3373EXPORT_SYMBOL(kernel_connect);
3374
3375int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
3376                         int *addrlen)
3377{
3378        return sock->ops->getname(sock, addr, addrlen, 0);
3379}
3380EXPORT_SYMBOL(kernel_getsockname);
3381
3382int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
3383                         int *addrlen)
3384{
3385        return sock->ops->getname(sock, addr, addrlen, 1);
3386}
3387EXPORT_SYMBOL(kernel_getpeername);
3388
3389int kernel_getsockopt(struct socket *sock, int level, int optname,
3390                        char *optval, int *optlen)
3391{
3392        mm_segment_t oldfs = get_fs();
3393        char __user *uoptval;
3394        int __user *uoptlen;
3395        int err;
3396
3397        uoptval = (char __user __force *) optval;
3398        uoptlen = (int __user __force *) optlen;
3399
3400        set_fs(KERNEL_DS);
3401        if (level == SOL_SOCKET)
3402                err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
3403        else
3404                err = sock->ops->getsockopt(sock, level, optname, uoptval,
3405                                            uoptlen);
3406        set_fs(oldfs);
3407        return err;
3408}
3409EXPORT_SYMBOL(kernel_getsockopt);
3410
3411int kernel_setsockopt(struct socket *sock, int level, int optname,
3412                        char *optval, unsigned int optlen)
3413{
3414        mm_segment_t oldfs = get_fs();
3415        char __user *uoptval;
3416        int err;
3417
3418        uoptval = (char __user __force *) optval;
3419
3420        set_fs(KERNEL_DS);
3421        if (level == SOL_SOCKET)
3422                err = sock_setsockopt(sock, level, optname, uoptval, optlen);
3423        else
3424                err = sock->ops->setsockopt(sock, level, optname, uoptval,
3425                                            optlen);
3426        set_fs(oldfs);
3427        return err;
3428}
3429EXPORT_SYMBOL(kernel_setsockopt);
3430
3431int kernel_sendpage(struct socket *sock, struct page *page, int offset,
3432                    size_t size, int flags)
3433{
3434        if (sock->ops->sendpage)
3435                return sock->ops->sendpage(sock, page, offset, size, flags);
3436
3437        return sock_no_sendpage(sock, page, offset, size, flags);
3438}
3439EXPORT_SYMBOL(kernel_sendpage);
3440
3441int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg)
3442{
3443        mm_segment_t oldfs = get_fs();
3444        int err;
3445
3446        set_fs(KERNEL_DS);
3447        err = sock->ops->ioctl(sock, cmd, arg);
3448        set_fs(oldfs);
3449
3450        return err;
3451}
3452EXPORT_SYMBOL(kernel_sock_ioctl);
3453
3454int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how)
3455{
3456        return sock->ops->shutdown(sock, how);
3457}
3458EXPORT_SYMBOL(kernel_sock_shutdown);
3459
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