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_timespec cts;
 219         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 220         struct compat_cmsghdr cmhdr;
 221         int cmlen;
 222
 223         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 224                 kmsg->msg_flags |= MSG_CTRUNC;
 225                 return 0; /* XXX: return error? check spec. */
 226         }
 227
 228         if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
 229                 struct timeval *tv = (struct timeval *)data;
 230                 ctv.tv_sec = tv->tv_sec;
 231                 ctv.tv_usec = tv->tv_usec;
 232                 data = &ctv;
 233                 len = sizeof(ctv);
 234         }
 235         if (level == SOL_SOCKET && type == SO_TIMESTAMPNS) {
 236                 struct timespec *ts = (struct timespec *)data;
 237                 cts.tv_sec = ts->tv_sec;
 238                 cts.tv_nsec = ts->tv_nsec;
 239                 data = &cts;
 240                 len = sizeof(cts);
 241         }
 242
 243         cmlen = CMSG_COMPAT_LEN(len);
 244         if (kmsg->msg_controllen < cmlen) {
 245                 kmsg->msg_flags |= MSG_CTRUNC;
 246                 cmlen = kmsg->msg_controllen;
 247         }
 248         cmhdr.cmsg_level = level;
 249         cmhdr.cmsg_type = type;
 250         cmhdr.cmsg_len = cmlen;
 251
 252         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 253                 return -EFAULT;
 254         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 255                 return -EFAULT;
 256         cmlen = CMSG_COMPAT_SPACE(len);
 257         kmsg->msg_control += cmlen;
 258         kmsg->msg_controllen -= cmlen;
 259         return 0;
 260 }
 261
 262 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 263 {
 264         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 265         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 266         int fdnum = scm->fp->count;
 267         struct file **fp = scm->fp->fp;
 268         int __user *cmfptr;
 269         int err = 0, i;
 270
 271         if (fdnum < fdmax)
 272                 fdmax = fdnum;
 273
 274         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 275                 int new_fd;
 276                 err = security_file_receive(fp[i]);
 277                 if (err)
 278                         break;
 279                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 280                                           ? O_CLOEXEC : 0);
 281                 if (err < 0)
 282                         break;
 283                 new_fd = err;
 284                 err = put_user(new_fd, cmfptr);
 285                 if (err) {
 286                         put_unused_fd(new_fd);
 287                         break;
 288                 }
 289                 /* Bump the usage count and install the file. */
 290                 get_file(fp[i]);
 291                 fd_install(new_fd, fp[i]);
 292         }
 293
 294         if (i > 0) {
 295                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 296                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 297                 if (!err)
 298                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 299                 if (!err)
 300                         err = put_user(cmlen, &cm->cmsg_len);
 301                 if (!err) {
 302                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 303                         kmsg->msg_control += cmlen;
 304                         kmsg->msg_controllen -= cmlen;
 305                 }
 306         }
 307         if (i < fdnum)
 308                 kmsg->msg_flags |= MSG_CTRUNC;
 309
 310         /*
 311          * All of the files that fit in the message have had their
 312          * usage counts incremented, so we just free the list.
 313          */
 314         __scm_destroy(scm);
 315 }
 316
 317 /*
 318  * For now, we assume that the compatibility and native version
 319  * of struct ipt_entry are the same - sfr.  FIXME
 320  */
 321 struct compat_ipt_replace {
 322         char                    name[IPT_TABLE_MAXNAMELEN];
 323         u32                     valid_hooks;
 324         u32                     num_entries;
 325         u32                     size;
 326         u32                     hook_entry[NF_IP_NUMHOOKS];
 327         u32                     underflow[NF_IP_NUMHOOKS];
 328         u32                     num_counters;
 329         compat_uptr_t           counters;       /* struct ipt_counters * */
 330         struct ipt_entry        entries[0];
 331 };
 332
 333 static int do_netfilter_replace(int fd, int level, int optname,
 334                                 char __user *optval, int optlen)
 335 {
 336         struct compat_ipt_replace __user *urepl;
 337         struct ipt_replace __user *repl_nat;
 338         char name[IPT_TABLE_MAXNAMELEN];
 339         u32 origsize, tmp32, num_counters;
 340         unsigned int repl_nat_size;
 341         int ret;
 342         int i;
 343         compat_uptr_t ucntrs;
 344
 345         urepl = (struct compat_ipt_replace __user *)optval;
 346         if (get_user(origsize, &urepl->size))
 347                 return -EFAULT;
 348
 349         /* Hack: Causes ipchains to give correct error msg --RR */
 350         if (optlen != sizeof(*urepl) + origsize)
 351                 return -ENOPROTOOPT;
 352
 353         /* XXX Assumes that size of ipt_entry is the same both in
 354          *     native and compat environments.
 355          */
 356         repl_nat_size = sizeof(*repl_nat) + origsize;
 357         repl_nat = compat_alloc_user_space(repl_nat_size);
 358
 359         ret = -EFAULT;
 360         if (put_user(origsize, &repl_nat->size))
 361                 goto out;
 362
 363         if (!access_ok(VERIFY_READ, urepl, optlen) ||
 364             !access_ok(VERIFY_WRITE, repl_nat, optlen))
 365                 goto out;
 366
 367         if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
 368             __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
 369                 goto out;
 370
 371         if (__get_user(tmp32, &urepl->valid_hooks) ||
 372             __put_user(tmp32, &repl_nat->valid_hooks))
 373                 goto out;
 374
 375         if (__get_user(tmp32, &urepl->num_entries) ||
 376             __put_user(tmp32, &repl_nat->num_entries))
 377                 goto out;
 378
 379         if (__get_user(num_counters, &urepl->num_counters) ||
 380             __put_user(num_counters, &repl_nat->num_counters))
 381                 goto out;
 382
 383         if (__get_user(ucntrs, &urepl->counters) ||
 384             __put_user(compat_ptr(ucntrs), &repl_nat->counters))
 385                 goto out;
 386
 387         if (__copy_in_user(&repl_nat->entries[0],
 388                            &urepl->entries[0],
 389                            origsize))
 390                 goto out;
 391
 392         for (i = 0; i < NF_IP_NUMHOOKS; i++) {
 393                 if (__get_user(tmp32, &urepl->hook_entry[i]) ||
 394                     __put_user(tmp32, &repl_nat->hook_entry[i]) ||
 395                     __get_user(tmp32, &urepl->underflow[i]) ||
 396                     __put_user(tmp32, &repl_nat->underflow[i]))
 397                         goto out;
 398         }
 399
 400         /*
 401          * Since struct ipt_counters just contains two u_int64_t members
 402          * we can just do the access_ok check here and pass the (converted)
 403          * pointer into the standard syscall.  We hope that the pointer is
 404          * not misaligned ...
 405          */
 406         if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
 407                        num_counters * sizeof(struct ipt_counters)))
 408                 goto out;
 409
 410
 411         ret = sys_setsockopt(fd, level, optname,
 412                              (char __user *)repl_nat, repl_nat_size);
 413
 414 out:
 415         return ret;
 416 }
 417
 418 /*
 419  * A struct sock_filter is architecture independent.
 420  */
 421 struct compat_sock_fprog {
 422         u16             len;
 423         compat_uptr_t   filter;         /* struct sock_filter * */
 424 };
 425
 426 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 427                                 char __user *optval, int optlen)
 428 {
 429         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 430         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 431         compat_uptr_t ptr;
 432         u16 len;
 433
 434         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 435             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 436             __get_user(len, &fprog32->len) ||
 437             __get_user(ptr, &fprog32->filter) ||
 438             __put_user(len, &kfprog->len) ||
 439             __put_user(compat_ptr(ptr), &kfprog->filter))
 440                 return -EFAULT;
 441
 442         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 443                               sizeof(struct sock_fprog));
 444 }
 445
 446 static int do_set_sock_timeout(struct socket *sock, int level,
 447                 int optname, char __user *optval, int optlen)
 448 {
 449         struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 450         struct timeval ktime;
 451         mm_segment_t old_fs;
 452         int err;
 453
 454         if (optlen < sizeof(*up))
 455                 return -EINVAL;
 456         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 457             __get_user(ktime.tv_sec, &up->tv_sec) ||
 458             __get_user(ktime.tv_usec, &up->tv_usec))
 459                 return -EFAULT;
 460         old_fs = get_fs();
 461         set_fs(KERNEL_DS);
 462         err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
 463         set_fs(old_fs);
 464
 465         return err;
 466 }
 467
 468 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 469                                 char __user *optval, int optlen)
 470 {
 471         if (optname == SO_ATTACH_FILTER)
 472                 return do_set_attach_filter(sock, level, optname,
 473                                             optval, optlen);
 474         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 475                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 476
 477         return sock_setsockopt(sock, level, optname, optval, optlen);
 478 }
 479
 480 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 481                                 char __user *optval, int optlen)
 482 {
 483         int err;
 484         struct socket *sock;
 485
 486         if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
 487                 return do_netfilter_replace(fd, level, optname,
 488                                             optval, optlen);
 489
 490         if (optlen < 0)
 491                 return -EINVAL;
 492
 493         if ((sock = sockfd_lookup(fd, &err))!=NULL)
 494         {
 495                 err = security_socket_setsockopt(sock,level,optname);
 496                 if (err) {
 497                         sockfd_put(sock);
 498                         return err;
 499                 }
 500
 501                 if (level == SOL_SOCKET)
 502                         err = compat_sock_setsockopt(sock, level,
 503                                         optname, optval, optlen);
 504                 else if (sock->ops->compat_setsockopt)
 505                         err = sock->ops->compat_setsockopt(sock, level,
 506                                         optname, optval, optlen);
 507                 else
 508                         err = sock->ops->setsockopt(sock, level,
 509                                         optname, optval, optlen);
 510                 sockfd_put(sock);
 511         }
 512         return err;
 513 }
 514
 515 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 516                 char __user *optval, int __user *optlen)
 517 {
 518         struct compat_timeval __user *up;
 519         struct timeval ktime;
 520         mm_segment_t old_fs;
 521         int len, err;
 522
 523         up = (struct compat_timeval __user *) optval;
 524         if (get_user(len, optlen))
 525                 return -EFAULT;
 526         if (len < sizeof(*up))
 527                 return -EINVAL;
 528         len = sizeof(ktime);
 529         old_fs = get_fs();
 530         set_fs(KERNEL_DS);
 531         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 532         set_fs(old_fs);
 533
 534         if (!err) {
 535                 if (put_user(sizeof(*up), optlen) ||
 536                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 537                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 538                     __put_user(ktime.tv_usec, &up->tv_usec))
 539                         err = -EFAULT;
 540         }
 541         return err;
 542 }
 543
 544 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 545                                 char __user *optval, int __user *optlen)
 546 {
 547         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 548                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 549         return sock_getsockopt(sock, level, optname, optval, optlen);
 550 }
 551
 552 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 553 {
 554         struct compat_timeval __user *ctv =
 555                         (struct compat_timeval __user*) userstamp;
 556         int err = -ENOENT;
 557         struct timeval tv;
 558
 559         if (!sock_flag(sk, SOCK_TIMESTAMP))
 560                 sock_enable_timestamp(sk);
 561         tv = ktime_to_timeval(sk->sk_stamp);
 562         if (tv.tv_sec == -1)
 563                 return err;
 564         if (tv.tv_sec == 0) {
 565                 sk->sk_stamp = ktime_get_real();
 566                 tv = ktime_to_timeval(sk->sk_stamp);
 567         }
 568         err = 0;
 569         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 570                         put_user(tv.tv_usec, &ctv->tv_usec))
 571                 err = -EFAULT;
 572         return err;
 573 }
 574 EXPORT_SYMBOL(compat_sock_get_timestamp);
 575
 576 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 577 {
 578         struct compat_timespec __user *ctv =
 579                         (struct compat_timespec __user*) userstamp;
 580         int err = -ENOENT;
 581         struct timespec ts;
 582
 583         if (!sock_flag(sk, SOCK_TIMESTAMP))
 584                 sock_enable_timestamp(sk);
 585         ts = ktime_to_timespec(sk->sk_stamp);
 586         if (ts.tv_sec == -1)
 587                 return err;
 588         if (ts.tv_sec == 0) {
 589                 sk->sk_stamp = ktime_get_real();
 590                 ts = ktime_to_timespec(sk->sk_stamp);
 591         }
 592         err = 0;
 593         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 594                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 595                 err = -EFAULT;
 596         return err;
 597 }
 598 EXPORT_SYMBOL(compat_sock_get_timestampns);
 599
 600 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 601                                 char __user *optval, int __user *optlen)
 602 {
 603         int err;
 604         struct socket *sock;
 605
 606         if ((sock = sockfd_lookup(fd, &err))!=NULL)
 607         {
 608                 err = security_socket_getsockopt(sock, level,
 609                                                            optname);
 610                 if (err) {
 611                         sockfd_put(sock);
 612                         return err;
 613                 }
 614
 615                 if (level == SOL_SOCKET)
 616                         err = compat_sock_getsockopt(sock, level,
 617                                         optname, optval, optlen);
 618                 else if (sock->ops->compat_getsockopt)
 619                         err = sock->ops->compat_getsockopt(sock, level,
 620                                         optname, optval, optlen);
 621                 else
 622                         err = sock->ops->getsockopt(sock, level,
 623                                         optname, optval, optlen);
 624                 sockfd_put(sock);
 625         }
 626         return err;
 627 }
 628 /* Argument list sizes for compat_sys_socketcall */
 629 #define AL(x) ((x) * sizeof(u32))
 630 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 631                                 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 632                                 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
 633 #undef AL
 634
 635 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 636 {
 637         return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 638 }
 639
 640 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 641 {
 642         return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 643 }
 644
 645 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 646 {
 647         int ret;
 648         u32 a[6];
 649         u32 a0, a1;
 650
 651         if (call < SYS_SOCKET || call > SYS_RECVMSG)
 652                 return -EINVAL;
 653         if (copy_from_user(a, args, nas[call]))
 654                 return -EFAULT;
 655         a0 = a[0];
 656         a1 = a[1];
 657
 658         switch (call) {
 659         case SYS_SOCKET:
 660                 ret = sys_socket(a0, a1, a[2]);
 661                 break;
 662         case SYS_BIND:
 663                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 664                 break;
 665         case SYS_CONNECT:
 666                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 667                 break;
 668         case SYS_LISTEN:
 669                 ret = sys_listen(a0, a1);
 670                 break;
 671         case SYS_ACCEPT:
 672                 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
 673                 break;
 674         case SYS_GETSOCKNAME:
 675                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 676                 break;
 677         case SYS_GETPEERNAME:
 678                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 679                 break;
 680         case SYS_SOCKETPAIR:
 681                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 682                 break;
 683         case SYS_SEND:
 684                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 685                 break;
 686         case SYS_SENDTO:
 687                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 688                 break;
 689         case SYS_RECV:
 690                 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 691                 break;
 692         case SYS_RECVFROM:
 693                 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 694                 break;
 695         case SYS_SHUTDOWN:
 696                 ret = sys_shutdown(a0,a1);
 697                 break;
 698         case SYS_SETSOCKOPT:
 699                 ret = compat_sys_setsockopt(a0, a1, a[2],
 700                                 compat_ptr(a[3]), a[4]);
 701                 break;
 702         case SYS_GETSOCKOPT:
 703                 ret = compat_sys_getsockopt(a0, a1, a[2],
 704                                 compat_ptr(a[3]), compat_ptr(a[4]));
 705                 break;
 706         case SYS_SENDMSG:
 707                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 708                 break;
 709         case SYS_RECVMSG:
 710                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 711                 break;
 712         default:
 713                 ret = -EINVAL;
 714                 break;
 715         }
 716         return ret;
 717 }