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         if (kmsg->msg_controllen < cmlen)
 258                 cmlen = kmsg->msg_controllen;
 259         kmsg->msg_control += cmlen;
 260         kmsg->msg_controllen -= cmlen;
 261         return 0;
 262 }
 263
 264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 265 {
 266         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 267         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 268         int fdnum = scm->fp->count;
 269         struct file **fp = scm->fp->fp;
 270         int __user *cmfptr;
 271         int err = 0, i;
 272
 273         if (fdnum < fdmax)
 274                 fdmax = fdnum;
 275
 276         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 277                 int new_fd;
 278                 err = security_file_receive(fp[i]);
 279                 if (err)
 280                         break;
 281                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 282                                           ? O_CLOEXEC : 0);
 283                 if (err < 0)
 284                         break;
 285                 new_fd = err;
 286                 err = put_user(new_fd, cmfptr);
 287                 if (err) {
 288                         put_unused_fd(new_fd);
 289                         break;
 290                 }
 291                 /* Bump the usage count and install the file. */
 292                 get_file(fp[i]);
 293                 fd_install(new_fd, fp[i]);
 294         }
 295
 296         if (i > 0) {
 297                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 298                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 299                 if (!err)
 300                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 301                 if (!err)
 302                         err = put_user(cmlen, &cm->cmsg_len);
 303                 if (!err) {
 304                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 305                         kmsg->msg_control += cmlen;
 306                         kmsg->msg_controllen -= cmlen;
 307                 }
 308         }
 309         if (i < fdnum)
 310                 kmsg->msg_flags |= MSG_CTRUNC;
 311
 312         /*
 313          * All of the files that fit in the message have had their
 314          * usage counts incremented, so we just free the list.
 315          */
 316         __scm_destroy(scm);
 317 }
 318
 319 /*
 320  * For now, we assume that the compatibility and native version
 321  * of struct ipt_entry are the same - sfr.  FIXME
 322  */
 323 struct compat_ipt_replace {
 324         char                    name[IPT_TABLE_MAXNAMELEN];
 325         u32                     valid_hooks;
 326         u32                     num_entries;
 327         u32                     size;
 328         u32                     hook_entry[NF_IP_NUMHOOKS];
 329         u32                     underflow[NF_IP_NUMHOOKS];
 330         u32                     num_counters;
 331         compat_uptr_t           counters;       /* struct ipt_counters * */
 332         struct ipt_entry        entries[0];
 333 };
 334
 335 static int do_netfilter_replace(int fd, int level, int optname,
 336                                 char __user *optval, int optlen)
 337 {
 338         struct compat_ipt_replace __user *urepl;
 339         struct ipt_replace __user *repl_nat;
 340         char name[IPT_TABLE_MAXNAMELEN];
 341         u32 origsize, tmp32, num_counters;
 342         unsigned int repl_nat_size;
 343         int ret;
 344         int i;
 345         compat_uptr_t ucntrs;
 346
 347         urepl = (struct compat_ipt_replace __user *)optval;
 348         if (get_user(origsize, &urepl->size))
 349                 return -EFAULT;
 350
 351         /* Hack: Causes ipchains to give correct error msg --RR */
 352         if (optlen != sizeof(*urepl) + origsize)
 353                 return -ENOPROTOOPT;
 354
 355         /* XXX Assumes that size of ipt_entry is the same both in
 356          *     native and compat environments.
 357          */
 358         repl_nat_size = sizeof(*repl_nat) + origsize;
 359         repl_nat = compat_alloc_user_space(repl_nat_size);
 360
 361         ret = -EFAULT;
 362         if (put_user(origsize, &repl_nat->size))
 363                 goto out;
 364
 365         if (!access_ok(VERIFY_READ, urepl, optlen) ||
 366             !access_ok(VERIFY_WRITE, repl_nat, optlen))
 367                 goto out;
 368
 369         if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
 370             __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
 371                 goto out;
 372
 373         if (__get_user(tmp32, &urepl->valid_hooks) ||
 374             __put_user(tmp32, &repl_nat->valid_hooks))
 375                 goto out;
 376
 377         if (__get_user(tmp32, &urepl->num_entries) ||
 378             __put_user(tmp32, &repl_nat->num_entries))
 379                 goto out;
 380
 381         if (__get_user(num_counters, &urepl->num_counters) ||
 382             __put_user(num_counters, &repl_nat->num_counters))
 383                 goto out;
 384
 385         if (__get_user(ucntrs, &urepl->counters) ||
 386             __put_user(compat_ptr(ucntrs), &repl_nat->counters))
 387                 goto out;
 388
 389         if (__copy_in_user(&repl_nat->entries[0],
 390                            &urepl->entries[0],
 391                            origsize))
 392                 goto out;
 393
 394         for (i = 0; i < NF_IP_NUMHOOKS; i++) {
 395                 if (__get_user(tmp32, &urepl->hook_entry[i]) ||
 396                     __put_user(tmp32, &repl_nat->hook_entry[i]) ||
 397                     __get_user(tmp32, &urepl->underflow[i]) ||
 398                     __put_user(tmp32, &repl_nat->underflow[i]))
 399                         goto out;
 400         }
 401
 402         /*
 403          * Since struct ipt_counters just contains two u_int64_t members
 404          * we can just do the access_ok check here and pass the (converted)
 405          * pointer into the standard syscall.  We hope that the pointer is
 406          * not misaligned ...
 407          */
 408         if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
 409                        num_counters * sizeof(struct ipt_counters)))
 410                 goto out;
 411
 412
 413         ret = sys_setsockopt(fd, level, optname,
 414                              (char __user *)repl_nat, repl_nat_size);
 415
 416 out:
 417         return ret;
 418 }
 419
 420 /*
 421  * A struct sock_filter is architecture independent.
 422  */
 423 struct compat_sock_fprog {
 424         u16             len;
 425         compat_uptr_t   filter;         /* struct sock_filter * */
 426 };
 427
 428 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 429                                 char __user *optval, int optlen)
 430 {
 431         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 432         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 433         compat_uptr_t ptr;
 434         u16 len;
 435
 436         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 437             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 438             __get_user(len, &fprog32->len) ||
 439             __get_user(ptr, &fprog32->filter) ||
 440             __put_user(len, &kfprog->len) ||
 441             __put_user(compat_ptr(ptr), &kfprog->filter))
 442                 return -EFAULT;
 443
 444         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 445                               sizeof(struct sock_fprog));
 446 }
 447
 448 static int do_set_sock_timeout(struct socket *sock, int level,
 449                 int optname, char __user *optval, int optlen)
 450 {
 451         struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 452         struct timeval ktime;
 453         mm_segment_t old_fs;
 454         int err;
 455
 456         if (optlen < sizeof(*up))
 457                 return -EINVAL;
 458         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 459             __get_user(ktime.tv_sec, &up->tv_sec) ||
 460             __get_user(ktime.tv_usec, &up->tv_usec))
 461                 return -EFAULT;
 462         old_fs = get_fs();
 463         set_fs(KERNEL_DS);
 464         err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
 465         set_fs(old_fs);
 466
 467         return err;
 468 }
 469
 470 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 471                                 char __user *optval, int optlen)
 472 {
 473         if (optname == SO_ATTACH_FILTER)
 474                 return do_set_attach_filter(sock, level, optname,
 475                                             optval, optlen);
 476         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 477                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 478
 479         return sock_setsockopt(sock, level, optname, optval, optlen);
 480 }
 481
 482 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 483                                 char __user *optval, int optlen)
 484 {
 485         int err;
 486         struct socket *sock;
 487
 488         if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
 489                 return do_netfilter_replace(fd, level, optname,
 490                                             optval, optlen);
 491
 492         if (optlen < 0)
 493                 return -EINVAL;
 494
 495         if ((sock = sockfd_lookup(fd, &err))!=NULL)
 496         {
 497                 err = security_socket_setsockopt(sock,level,optname);
 498                 if (err) {
 499                         sockfd_put(sock);
 500                         return err;
 501                 }
 502
 503                 if (level == SOL_SOCKET)
 504                         err = compat_sock_setsockopt(sock, level,
 505                                         optname, optval, optlen);
 506                 else if (sock->ops->compat_setsockopt)
 507                         err = sock->ops->compat_setsockopt(sock, level,
 508                                         optname, optval, optlen);
 509                 else
 510                         err = sock->ops->setsockopt(sock, level,
 511                                         optname, optval, optlen);
 512                 sockfd_put(sock);
 513         }
 514         return err;
 515 }
 516
 517 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 518                 char __user *optval, int __user *optlen)
 519 {
 520         struct compat_timeval __user *up;
 521         struct timeval ktime;
 522         mm_segment_t old_fs;
 523         int len, err;
 524
 525         up = (struct compat_timeval __user *) optval;
 526         if (get_user(len, optlen))
 527                 return -EFAULT;
 528         if (len < sizeof(*up))
 529                 return -EINVAL;
 530         len = sizeof(ktime);
 531         old_fs = get_fs();
 532         set_fs(KERNEL_DS);
 533         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 534         set_fs(old_fs);
 535
 536         if (!err) {
 537                 if (put_user(sizeof(*up), optlen) ||
 538                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 539                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 540                     __put_user(ktime.tv_usec, &up->tv_usec))
 541                         err = -EFAULT;
 542         }
 543         return err;
 544 }
 545
 546 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 547                                 char __user *optval, int __user *optlen)
 548 {
 549         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 550                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 551         return sock_getsockopt(sock, level, optname, optval, optlen);
 552 }
 553
 554 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 555 {
 556         struct compat_timeval __user *ctv =
 557                         (struct compat_timeval __user*) userstamp;
 558         int err = -ENOENT;
 559         struct timeval tv;
 560
 561         if (!sock_flag(sk, SOCK_TIMESTAMP))
 562                 sock_enable_timestamp(sk);
 563         tv = ktime_to_timeval(sk->sk_stamp);
 564         if (tv.tv_sec == -1)
 565                 return err;
 566         if (tv.tv_sec == 0) {
 567                 sk->sk_stamp = ktime_get_real();
 568                 tv = ktime_to_timeval(sk->sk_stamp);
 569         }
 570         err = 0;
 571         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 572                         put_user(tv.tv_usec, &ctv->tv_usec))
 573                 err = -EFAULT;
 574         return err;
 575 }
 576 EXPORT_SYMBOL(compat_sock_get_timestamp);
 577
 578 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 579 {
 580         struct compat_timespec __user *ctv =
 581                         (struct compat_timespec __user*) userstamp;
 582         int err = -ENOENT;
 583         struct timespec ts;
 584
 585         if (!sock_flag(sk, SOCK_TIMESTAMP))
 586                 sock_enable_timestamp(sk);
 587         ts = ktime_to_timespec(sk->sk_stamp);
 588         if (ts.tv_sec == -1)
 589                 return err;
 590         if (ts.tv_sec == 0) {
 591                 sk->sk_stamp = ktime_get_real();
 592                 ts = ktime_to_timespec(sk->sk_stamp);
 593         }
 594         err = 0;
 595         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 596                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 597                 err = -EFAULT;
 598         return err;
 599 }
 600 EXPORT_SYMBOL(compat_sock_get_timestampns);
 601
 602 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 603                                 char __user *optval, int __user *optlen)
 604 {
 605         int err;
 606         struct socket *sock;
 607
 608         if ((sock = sockfd_lookup(fd, &err))!=NULL)
 609         {
 610                 err = security_socket_getsockopt(sock, level,
 611                                                            optname);
 612                 if (err) {
 613                         sockfd_put(sock);
 614                         return err;
 615                 }
 616
 617                 if (level == SOL_SOCKET)
 618                         err = compat_sock_getsockopt(sock, level,
 619                                         optname, optval, optlen);
 620                 else if (sock->ops->compat_getsockopt)
 621                         err = sock->ops->compat_getsockopt(sock, level,
 622                                         optname, optval, optlen);
 623                 else
 624                         err = sock->ops->getsockopt(sock, level,
 625                                         optname, optval, optlen);
 626                 sockfd_put(sock);
 627         }
 628         return err;
 629 }
 630 /* Argument list sizes for compat_sys_socketcall */
 631 #define AL(x) ((x) * sizeof(u32))
 632 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 633                                 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 634                                 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
 635 #undef AL
 636
 637 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 638 {
 639         return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 640 }
 641
 642 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 643 {
 644         return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 645 }
 646
 647 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 648 {
 649         int ret;
 650         u32 a[6];
 651         u32 a0, a1;
 652
 653         if (call < SYS_SOCKET || call > SYS_RECVMSG)
 654                 return -EINVAL;
 655         if (copy_from_user(a, args, nas[call]))
 656                 return -EFAULT;
 657         a0 = a[0];
 658         a1 = a[1];
 659
 660         switch (call) {
 661         case SYS_SOCKET:
 662                 ret = sys_socket(a0, a1, a[2]);
 663                 break;
 664         case SYS_BIND:
 665                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 666                 break;
 667         case SYS_CONNECT:
 668                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 669                 break;
 670         case SYS_LISTEN:
 671                 ret = sys_listen(a0, a1);
 672                 break;
 673         case SYS_ACCEPT:
 674                 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
 675                 break;
 676         case SYS_GETSOCKNAME:
 677                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 678                 break;
 679         case SYS_GETPEERNAME:
 680                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 681                 break;
 682         case SYS_SOCKETPAIR:
 683                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 684                 break;
 685         case SYS_SEND:
 686                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 687                 break;
 688         case SYS_SENDTO:
 689                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 690                 break;
 691         case SYS_RECV:
 692                 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 693                 break;
 694         case SYS_RECVFROM:
 695                 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 696                 break;
 697         case SYS_SHUTDOWN:
 698                 ret = sys_shutdown(a0,a1);
 699                 break;
 700         case SYS_SETSOCKOPT:
 701                 ret = compat_sys_setsockopt(a0, a1, a[2],
 702                                 compat_ptr(a[3]), a[4]);
 703                 break;
 704         case SYS_GETSOCKOPT:
 705                 ret = compat_sys_getsockopt(a0, a1, a[2],
 706                                 compat_ptr(a[3]), compat_ptr(a[4]));
 707                 break;
 708         case SYS_SENDMSG:
 709                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 710                 break;
 711         case SYS_RECVMSG:
 712                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 713                 break;
 714         default:
 715                 ret = -EINVAL;
 716                 break;
 717         }
 718         return ret;
 719 }