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