net/compat.c

   1 /*
   2  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3  *
   4  * Copyright (C) 2000           VA Linux Co
   5  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9  * Copyright (C) 2000           Hewlett-Packard Co.
  10  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/fs.h>
  16 #include <linux/types.h>
  17 #include <linux/file.h>
  18 #include <linux/icmpv6.h>
  19 #include <linux/socket.h>
  20 #include <linux/syscalls.h>
  21 #include <linux/filter.h>
  22 #include <linux/compat.h>
  23 #include <linux/netfilter_ipv4/ip_tables.h>
  24 #include <linux/security.h>
  25
  26 #include <net/scm.h>
  27 #include <net/sock.h>
  28 #include <asm/uaccess.h>
  29 #include <net/compat.h>
  30
  31 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  32                                           struct compat_iovec __user *uiov32,
  33                                           int niov)
  34 {
  35         int tot_len = 0;
  36
  37         while(niov > 0) {
  38                 compat_uptr_t buf;
  39                 compat_size_t len;
  40
  41                 if(get_user(len, &uiov32->iov_len) ||
  42                    get_user(buf, &uiov32->iov_base)) {
  43                         tot_len = -EFAULT;
  44                         break;
  45                 }
  46                 tot_len += len;
  47                 kiov->iov_base = compat_ptr(buf);
  48                 kiov->iov_len = (__kernel_size_t) len;
  49                 uiov32++;
  50                 kiov++;
  51                 niov--;
  52         }
  53         return tot_len;
  54 }
  55
  56 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  57 {
  58         compat_uptr_t tmp1, tmp2, tmp3;
  59
  60         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  61             __get_user(tmp1, &umsg->msg_name) ||
  62             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  63             __get_user(tmp2, &umsg->msg_iov) ||
  64             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  65             __get_user(tmp3, &umsg->msg_control) ||
  66             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  67             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  68                 return -EFAULT;
  69         kmsg->msg_name = compat_ptr(tmp1);
  70         kmsg->msg_iov = compat_ptr(tmp2);
  71         kmsg->msg_control = compat_ptr(tmp3);
  72         return 0;
  73 }
  74
  75 /* I've named the args so it is easy to tell whose space the pointers are in. */
  76 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  77                    char *kern_address, int mode)
  78 {
  79         int tot_len;
  80
  81         if(kern_msg->msg_namelen) {
  82                 if(mode==VERIFY_READ) {
  83                         int err = move_addr_to_kernel(kern_msg->msg_name,
  84                                                       kern_msg->msg_namelen,
  85                                                       kern_address);
  86                         if(err < 0)
  87                                 return err;
  88                 }
  89                 kern_msg->msg_name = kern_address;
  90         } else
  91                 kern_msg->msg_name = NULL;
  92
  93         tot_len = iov_from_user_compat_to_kern(kern_iov,
  94                                           (struct compat_iovec __user *)kern_msg->msg_iov,
  95                                           kern_msg->msg_iovlen);
  96         if(tot_len >= 0)
  97                 kern_msg->msg_iov = kern_iov;
  98
  99         return tot_len;
 100 }
 101
 102 /* Bleech... */
 103 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 104
 105 #define CMSG_COMPAT_DATA(cmsg)                          \
 106         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 107 #define CMSG_COMPAT_SPACE(len)                          \
 108         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 109 #define CMSG_COMPAT_LEN(len)                            \
 110         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 111
 112 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 113         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 114          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 115          (struct compat_cmsghdr __user *)NULL)
 116
 117 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 118         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 119          (ucmlen) <= (unsigned long) \
 120          ((mhdr)->msg_controllen - \
 121           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 122
 123 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 124                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 125 {
 126         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 127         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 128                         msg->msg_controllen)
 129                 return NULL;
 130         return (struct compat_cmsghdr __user *)ptr;
 131 }
 132
 133 /* There is a lot of hair here because the alignment rules (and
 134  * thus placement) of cmsg headers and length are different for
 135  * 32-bit apps.  -DaveM
 136  */
 137 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 138                                unsigned char *stackbuf, int stackbuf_size)
 139 {
 140         struct compat_cmsghdr __user *ucmsg;
 141         struct cmsghdr *kcmsg, *kcmsg_base;
 142         compat_size_t ucmlen;
 143         __kernel_size_t kcmlen, tmp;
 144         int err = -EFAULT;
 145
 146         kcmlen = 0;
 147         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 148         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 149         while(ucmsg != NULL) {
 150                 if(get_user(ucmlen, &ucmsg->cmsg_len))
 151                         return -EFAULT;
 152
 153                 /* Catch bogons. */
 154                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 155                         return -EINVAL;
 156
 157                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 158                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 159                 tmp = CMSG_ALIGN(tmp);
 160                 kcmlen += tmp;
 161                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 162         }
 163         if(kcmlen == 0)
 164                 return -EINVAL;
 165
 166         /* The kcmlen holds the 64-bit version of the control length.
 167          * It may not be modified as we do not stick it into the kmsg
 168          * until we have successfully copied over all of the data
 169          * from the user.
 170          */
 171         if (kcmlen > stackbuf_size)
 172                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 173         if (kcmsg == NULL)
 174                 return -ENOBUFS;
 175
 176         /* Now copy them over neatly. */
 177         memset(kcmsg, 0, kcmlen);
 178         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 179         while(ucmsg != NULL) {
 180                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 181                         goto Efault;
 182                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 183                         goto Einval;
 184                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 185                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 186                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 187                         goto Einval;
 188                 kcmsg->cmsg_len = tmp;
 189                 tmp = CMSG_ALIGN(tmp);
 190                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 191                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 192                     copy_from_user(CMSG_DATA(kcmsg),
 193                                    CMSG_COMPAT_DATA(ucmsg),
 194                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 195                         goto Efault;
 196
 197                 /* Advance. */
 198                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 199                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 200         }
 201
 202         /* Ok, looks like we made it.  Hook it up and return success. */
 203         kmsg->msg_control = kcmsg_base;
 204         kmsg->msg_controllen = kcmlen;
 205         return 0;
 206
 207 Einval:
 208         err = -EINVAL;
 209 Efault:
 210         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 211                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 212         return err;
 213 }
 214
 215 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 216 {
 217         struct compat_timeval ctv;
 218         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 219         struct compat_cmsghdr cmhdr;
 220         int cmlen;
 221
 222         if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 223                 kmsg->msg_flags |= MSG_CTRUNC;
 224                 return 0; /* XXX: return error? check spec. */
 225         }
 226
 227         if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
 228                 struct timeval *tv = (struct timeval *)data;
 229                 ctv.tv_sec = tv->tv_sec;
 230                 ctv.tv_usec = tv->tv_usec;
 231                 data = &ctv;
 232                 len = sizeof(struct compat_timeval);
 233         }
 234
 235         cmlen = CMSG_COMPAT_LEN(len);
 236         if(kmsg->msg_controllen < cmlen) {
 237                 kmsg->msg_flags |= MSG_CTRUNC;
 238                 cmlen = kmsg->msg_controllen;
 239         }
 240         cmhdr.cmsg_level = level;
 241         cmhdr.cmsg_type = type;
 242         cmhdr.cmsg_len = cmlen;
 243
 244         if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
 245                 return -EFAULT;
 246         if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 247                 return -EFAULT;
 248         cmlen = CMSG_COMPAT_SPACE(len);
 249         kmsg->msg_control += cmlen;
 250         kmsg->msg_controllen -= cmlen;
 251         return 0;
 252 }
 253
 254 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 255 {
 256         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 257         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 258         int fdnum = scm->fp->count;
 259         struct file **fp = scm->fp->fp;
 260         int __user *cmfptr;
 261         int err = 0, i;
 262
 263         if (fdnum < fdmax)
 264                 fdmax = fdnum;
 265
 266         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 267                 int new_fd;
 268                 err = security_file_receive(fp[i]);
 269                 if (err)
 270                         break;
 271                 err = get_unused_fd();
 272                 if (err < 0)
 273                         break;
 274                 new_fd = err;
 275                 err = put_user(new_fd, cmfptr);
 276                 if (err) {
 277                         put_unused_fd(new_fd);
 278                         break;
 279                 }
 280                 /* Bump the usage count and install the file. */
 281                 get_file(fp[i]);
 282                 fd_install(new_fd, fp[i]);
 283         }
 284
 285         if (i > 0) {
 286                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 287                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 288                 if (!err)
 289                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 290                 if (!err)
 291                         err = put_user(cmlen, &cm->cmsg_len);
 292                 if (!err) {
 293                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 294                         kmsg->msg_control += cmlen;
 295                         kmsg->msg_controllen -= cmlen;
 296                 }
 297         }
 298         if (i < fdnum)
 299                 kmsg->msg_flags |= MSG_CTRUNC;
 300
 301         /*
 302          * All of the files that fit in the message have had their
 303          * usage counts incremented, so we just free the list.
 304          */
 305         __scm_destroy(scm);
 306 }
 307
 308 /*
 309  * For now, we assume that the compatibility and native version
 310  * of struct ipt_entry are the same - sfr.  FIXME
 311  */
 312 struct compat_ipt_replace {
 313         char                    name[IPT_TABLE_MAXNAMELEN];
 314         u32                     valid_hooks;
 315         u32                     num_entries;
 316         u32                     size;
 317         u32                     hook_entry[NF_IP_NUMHOOKS];
 318         u32                     underflow[NF_IP_NUMHOOKS];
 319         u32                     num_counters;
 320         compat_uptr_t           counters;       /* struct ipt_counters * */
 321         struct ipt_entry        entries[0];
 322 };
 323
 324 static int do_netfilter_replace(int fd, int level, int optname,
 325                                 char __user *optval, int optlen)
 326 {
 327         struct compat_ipt_replace __user *urepl;
 328         struct ipt_replace __user *repl_nat;
 329         char name[IPT_TABLE_MAXNAMELEN];
 330         u32 origsize, tmp32, num_counters;
 331         unsigned int repl_nat_size;
 332         int ret;
 333         int i;
 334         compat_uptr_t ucntrs;
 335
 336         urepl = (struct compat_ipt_replace __user *)optval;
 337         if (get_user(origsize, &urepl->size))
 338                 return -EFAULT;
 339
 340         /* Hack: Causes ipchains to give correct error msg --RR */
 341         if (optlen != sizeof(*urepl) + origsize)
 342                 return -ENOPROTOOPT;
 343
 344         /* XXX Assumes that size of ipt_entry is the same both in
 345          *     native and compat environments.
 346          */
 347         repl_nat_size = sizeof(*repl_nat) + origsize;
 348         repl_nat = compat_alloc_user_space(repl_nat_size);
 349
 350         ret = -EFAULT;
 351         if (put_user(origsize, &repl_nat->size))
 352                 goto out;
 353
 354         if (!access_ok(VERIFY_READ, urepl, optlen) ||
 355             !access_ok(VERIFY_WRITE, repl_nat, optlen))
 356                 goto out;
 357
 358         if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
 359             __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
 360                 goto out;
 361
 362         if (__get_user(tmp32, &urepl->valid_hooks) ||
 363             __put_user(tmp32, &repl_nat->valid_hooks))
 364                 goto out;
 365
 366         if (__get_user(tmp32, &urepl->num_entries) ||
 367             __put_user(tmp32, &repl_nat->num_entries))
 368                 goto out;
 369
 370         if (__get_user(num_counters, &urepl->num_counters) ||
 371             __put_user(num_counters, &repl_nat->num_counters))
 372                 goto out;
 373
 374         if (__get_user(ucntrs, &urepl->counters) ||
 375             __put_user(compat_ptr(ucntrs), &repl_nat->counters))
 376                 goto out;
 377
 378         if (__copy_in_user(&repl_nat->entries[0],
 379                            &urepl->entries[0],
 380                            origsize))
 381                 goto out;
 382
 383         for (i = 0; i < NF_IP_NUMHOOKS; i++) {
 384                 if (__get_user(tmp32, &urepl->hook_entry[i]) ||
 385                     __put_user(tmp32, &repl_nat->hook_entry[i]) ||
 386                     __get_user(tmp32, &urepl->underflow[i]) ||
 387                     __put_user(tmp32, &repl_nat->underflow[i]))
 388                         goto out;
 389         }
 390
 391         /*
 392          * Since struct ipt_counters just contains two u_int64_t members
 393          * we can just do the access_ok check here and pass the (converted)
 394          * pointer into the standard syscall.  We hope that the pointer is
 395          * not misaligned ...
 396          */
 397         if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
 398                        num_counters * sizeof(struct ipt_counters)))
 399                 goto out;
 400
 401
 402         ret = sys_setsockopt(fd, level, optname,
 403                              (char __user *)repl_nat, repl_nat_size);
 404
 405 out:
 406         return ret;
 407 }
 408
 409 /*
 410  * A struct sock_filter is architecture independent.
 411  */
 412 struct compat_sock_fprog {
 413         u16             len;
 414         compat_uptr_t   filter;         /* struct sock_filter * */
 415 };
 416
 417 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 418                                 char __user *optval, int optlen)
 419 {
 420         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 421         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 422         compat_uptr_t ptr;
 423         u16 len;
 424
 425         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 426             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 427             __get_user(len, &fprog32->len) ||
 428             __get_user(ptr, &fprog32->filter) ||
 429             __put_user(len, &kfprog->len) ||
 430             __put_user(compat_ptr(ptr), &kfprog->filter))
 431                 return -EFAULT;
 432
 433         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 434                               sizeof(struct sock_fprog));
 435 }
 436
 437 static int do_set_sock_timeout(struct socket *sock, int level,
 438                 int optname, char __user *optval, int optlen)
 439 {
 440         struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 441         struct timeval ktime;
 442         mm_segment_t old_fs;
 443         int err;
 444
 445         if (optlen < sizeof(*up))
 446                 return -EINVAL;
 447         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 448             __get_user(ktime.tv_sec, &up->tv_sec) ||
 449             __get_user(ktime.tv_usec, &up->tv_usec))
 450                 return -EFAULT;
 451         old_fs = get_fs();
 452         set_fs(KERNEL_DS);
 453         err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
 454         set_fs(old_fs);
 455
 456         return err;
 457 }
 458
 459 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 460                                 char __user *optval, int optlen)
 461 {
 462         if (optname == SO_ATTACH_FILTER)
 463                 return do_set_attach_filter(sock, level, optname,
 464                                             optval, optlen);
 465         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 466                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 467
 468         return sock_setsockopt(sock, level, optname, optval, optlen);
 469 }
 470
 471 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 472                                 char __user *optval, int optlen)
 473 {
 474         int err;
 475         struct socket *sock;
 476
 477         if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
 478                 return do_netfilter_replace(fd, level, optname,
 479                                             optval, optlen);
 480
 481         if (optlen < 0)
 482                 return -EINVAL;
 483
 484         if ((sock = sockfd_lookup(fd, &err))!=NULL)
 485         {
 486                 err = security_socket_setsockopt(sock,level,optname);
 487                 if (err) {
 488                         sockfd_put(sock);
 489                         return err;
 490                 }
 491
 492                 if (level == SOL_SOCKET)
 493                         err = compat_sock_setsockopt(sock, level,
 494                                         optname, optval, optlen);
 495                 else if (sock->ops->compat_setsockopt)
 496                         err = sock->ops->compat_setsockopt(sock, level,
 497                                         optname, optval, optlen);
 498                 else
 499                         err = sock->ops->setsockopt(sock, level,
 500                                         optname, optval, optlen);
 501                 sockfd_put(sock);
 502         }
 503         return err;
 504 }
 505
 506 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 507                 char __user *optval, int __user *optlen)
 508 {
 509         struct compat_timeval __user *up;
 510         struct timeval ktime;
 511         mm_segment_t old_fs;
 512         int len, err;
 513
 514         up = (struct compat_timeval __user *) optval;
 515         if (get_user(len, optlen))
 516                 return -EFAULT;
 517         if (len < sizeof(*up))
 518                 return -EINVAL;
 519         len = sizeof(ktime);
 520         old_fs = get_fs();
 521         set_fs(KERNEL_DS);
 522         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 523         set_fs(old_fs);
 524
 525         if (!err) {
 526                 if (put_user(sizeof(*up), optlen) ||
 527                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 528                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 529                     __put_user(ktime.tv_usec, &up->tv_usec))
 530                         err = -EFAULT;
 531         }
 532         return err;
 533 }
 534
 535 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 536                                 char __user *optval, int __user *optlen)
 537 {
 538         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 539                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 540         return sock_getsockopt(sock, level, optname, optval, optlen);
 541 }
 542
 543 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 544 {
 545         struct compat_timeval __user *ctv =
 546                         (struct compat_timeval __user*) userstamp;
 547         int err = -ENOENT;
 548
 549         if (!sock_flag(sk, SOCK_TIMESTAMP))
 550                 sock_enable_timestamp(sk);
 551         if (sk->sk_stamp.tv_sec == -1)
 552                 return err;
 553         if (sk->sk_stamp.tv_sec == 0)
 554                 do_gettimeofday(&sk->sk_stamp);
 555         if (put_user(sk->sk_stamp.tv_sec, &ctv->tv_sec) ||
 556                         put_user(sk->sk_stamp.tv_usec, &ctv->tv_usec))
 557                 err = -EFAULT;
 558         return err;
 559 }
 560 EXPORT_SYMBOL(compat_sock_get_timestamp);
 561
 562 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 563                                 char __user *optval, int __user *optlen)
 564 {
 565         int err;
 566         struct socket *sock;
 567
 568         if ((sock = sockfd_lookup(fd, &err))!=NULL)
 569         {
 570                 err = security_socket_getsockopt(sock, level,
 571                                                            optname);
 572                 if (err) {
 573                         sockfd_put(sock);
 574                         return err;
 575                 }
 576
 577                 if (level == SOL_SOCKET)
 578                         err = compat_sock_getsockopt(sock, level,
 579                                         optname, optval, optlen);
 580                 else if (sock->ops->compat_getsockopt)
 581                         err = sock->ops->compat_getsockopt(sock, level,
 582                                         optname, optval, optlen);
 583                 else
 584                         err = sock->ops->getsockopt(sock, level,
 585                                         optname, optval, optlen);
 586                 sockfd_put(sock);
 587         }
 588         return err;
 589 }
 590 /* Argument list sizes for compat_sys_socketcall */
 591 #define AL(x) ((x) * sizeof(u32))
 592 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 593                                 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 594                                 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
 595 #undef AL
 596
 597 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 598 {
 599         return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 600 }
 601
 602 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 603 {
 604         return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 605 }
 606
 607 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 608 {
 609         int ret;
 610         u32 a[6];
 611         u32 a0, a1;
 612
 613         if (call < SYS_SOCKET || call > SYS_RECVMSG)
 614                 return -EINVAL;
 615         if (copy_from_user(a, args, nas[call]))
 616                 return -EFAULT;
 617         a0 = a[0];
 618         a1 = a[1];
 619
 620         switch(call) {
 621         case SYS_SOCKET:
 622                 ret = sys_socket(a0, a1, a[2]);
 623                 break;
 624         case SYS_BIND:
 625                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 626                 break;
 627         case SYS_CONNECT:
 628                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 629                 break;
 630         case SYS_LISTEN:
 631                 ret = sys_listen(a0, a1);
 632                 break;
 633         case SYS_ACCEPT:
 634                 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
 635                 break;
 636         case SYS_GETSOCKNAME:
 637                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 638                 break;
 639         case SYS_GETPEERNAME:
 640                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 641                 break;
 642         case SYS_SOCKETPAIR:
 643                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 644                 break;
 645         case SYS_SEND:
 646                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 647                 break;
 648         case SYS_SENDTO:
 649                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 650                 break;
 651         case SYS_RECV:
 652                 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 653                 break;
 654         case SYS_RECVFROM:
 655                 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 656                 break;
 657         case SYS_SHUTDOWN:
 658                 ret = sys_shutdown(a0,a1);
 659                 break;
 660         case SYS_SETSOCKOPT:
 661                 ret = compat_sys_setsockopt(a0, a1, a[2],
 662                                 compat_ptr(a[3]), a[4]);
 663                 break;
 664         case SYS_GETSOCKOPT:
 665                 ret = compat_sys_getsockopt(a0, a1, a[2],
 666                                 compat_ptr(a[3]), compat_ptr(a[4]));
 667                 break;
 668         case SYS_SENDMSG:
 669                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 670                 break;
 671         case SYS_RECVMSG:
 672                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 673                 break;
 674         default:
 675                 ret = -EINVAL;
 676                 break;
 677         }
 678         return ret;
 679 }