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