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/gfp.h>
  16 #include <linux/fs.h>
  17 #include <linux/types.h>
  18 #include <linux/file.h>
  19 #include <linux/icmpv6.h>
  20 #include <linux/socket.h>
  21 #include <linux/syscalls.h>
  22 #include <linux/filter.h>
  23 #include <linux/compat.h>
  24 #include <linux/security.h>
  25 #include <linux/export.h>
  26
  27 #include <net/scm.h>
  28 #include <net/sock.h>
  29 #include <net/ip.h>
  30 #include <net/ipv6.h>
  31 #include <asm/uaccess.h>
  32 #include <net/compat.h>
  33
  34 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  35                                           struct compat_iovec __user *uiov32,
  36                                           int niov)
  37 {
  38         int tot_len = 0;
  39
  40         while (niov > 0) {
  41                 compat_uptr_t buf;
  42                 compat_size_t len;
  43
  44                 if (get_user(len, &uiov32->iov_len) ||
  45                     get_user(buf, &uiov32->iov_base))
  46                         return -EFAULT;
  47
  48                 if (len > INT_MAX - tot_len)
  49                         len = INT_MAX - tot_len;
  50
  51                 tot_len += len;
  52                 kiov->iov_base = compat_ptr(buf);
  53                 kiov->iov_len = (__kernel_size_t) len;
  54                 uiov32++;
  55                 kiov++;
  56                 niov--;
  57         }
  58         return tot_len;
  59 }
  60
  61 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  62 {
  63         compat_uptr_t tmp1, tmp2, tmp3;
  64
  65         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  66             __get_user(tmp1, &umsg->msg_name) ||
  67             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  68             __get_user(tmp2, &umsg->msg_iov) ||
  69             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  70             __get_user(tmp3, &umsg->msg_control) ||
  71             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  72             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  73                 return -EFAULT;
  74         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  75                 return -EINVAL;
  76         kmsg->msg_name = compat_ptr(tmp1);
  77         kmsg->msg_iov = compat_ptr(tmp2);
  78         kmsg->msg_control = compat_ptr(tmp3);
  79         return 0;
  80 }
  81
  82 /* I've named the args so it is easy to tell whose space the pointers are in. */
  83 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  84                    struct sockaddr_storage *kern_address, int mode)
  85 {
  86         int tot_len;
  87
  88         if (kern_msg->msg_namelen) {
  89                 if (mode == VERIFY_READ) {
  90                         int err = move_addr_to_kernel(kern_msg->msg_name,
  91                                                       kern_msg->msg_namelen,
  92                                                       kern_address);
  93                         if (err < 0)
  94                                 return err;
  95                 }
  96                 kern_msg->msg_name = kern_address;
  97         } else
  98                 kern_msg->msg_name = NULL;
  99
 100         tot_len = iov_from_user_compat_to_kern(kern_iov,
 101                                           (struct compat_iovec __user *)kern_msg->msg_iov,
 102                                           kern_msg->msg_iovlen);
 103         if (tot_len >= 0)
 104                 kern_msg->msg_iov = kern_iov;
 105
 106         return tot_len;
 107 }
 108
 109 /* Bleech... */
 110 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 111
 112 #define CMSG_COMPAT_DATA(cmsg)                          \
 113         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 114 #define CMSG_COMPAT_SPACE(len)                          \
 115         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 116 #define CMSG_COMPAT_LEN(len)                            \
 117         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 118
 119 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 120         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 121          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 122          (struct compat_cmsghdr __user *)NULL)
 123
 124 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 125         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 126          (ucmlen) <= (unsigned long) \
 127          ((mhdr)->msg_controllen - \
 128           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 129
 130 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 131                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 132 {
 133         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 134         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 135                         msg->msg_controllen)
 136                 return NULL;
 137         return (struct compat_cmsghdr __user *)ptr;
 138 }
 139
 140 /* There is a lot of hair here because the alignment rules (and
 141  * thus placement) of cmsg headers and length are different for
 142  * 32-bit apps.  -DaveM
 143  */
 144 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 145                                unsigned char *stackbuf, int stackbuf_size)
 146 {
 147         struct compat_cmsghdr __user *ucmsg;
 148         struct cmsghdr *kcmsg, *kcmsg_base;
 149         compat_size_t ucmlen;
 150         __kernel_size_t kcmlen, tmp;
 151         int err = -EFAULT;
 152
 153         kcmlen = 0;
 154         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 155         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 156         while (ucmsg != NULL) {
 157                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 158                         return -EFAULT;
 159
 160                 /* Catch bogons. */
 161                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 162                         return -EINVAL;
 163
 164                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 165                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 166                 tmp = CMSG_ALIGN(tmp);
 167                 kcmlen += tmp;
 168                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 169         }
 170         if (kcmlen == 0)
 171                 return -EINVAL;
 172
 173         /* The kcmlen holds the 64-bit version of the control length.
 174          * It may not be modified as we do not stick it into the kmsg
 175          * until we have successfully copied over all of the data
 176          * from the user.
 177          */
 178         if (kcmlen > stackbuf_size)
 179                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 180         if (kcmsg == NULL)
 181                 return -ENOBUFS;
 182
 183         /* Now copy them over neatly. */
 184         memset(kcmsg, 0, kcmlen);
 185         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 186         while (ucmsg != NULL) {
 187                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 188                         goto Efault;
 189                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 190                         goto Einval;
 191                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 192                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 193                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 194                         goto Einval;
 195                 kcmsg->cmsg_len = tmp;
 196                 tmp = CMSG_ALIGN(tmp);
 197                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 198                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 199                     copy_from_user(CMSG_DATA(kcmsg),
 200                                    CMSG_COMPAT_DATA(ucmsg),
 201                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 202                         goto Efault;
 203
 204                 /* Advance. */
 205                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 206                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 207         }
 208
 209         /* Ok, looks like we made it.  Hook it up and return success. */
 210         kmsg->msg_control = kcmsg_base;
 211         kmsg->msg_controllen = kcmlen;
 212         return 0;
 213
 214 Einval:
 215         err = -EINVAL;
 216 Efault:
 217         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 218                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 219         return err;
 220 }
 221
 222 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 223 {
 224         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 225         struct compat_cmsghdr cmhdr;
 226         struct compat_timeval ctv;
 227         struct compat_timespec cts[3];
 228         int cmlen;
 229
 230         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 231                 kmsg->msg_flags |= MSG_CTRUNC;
 232                 return 0; /* XXX: return error? check spec. */
 233         }
 234
 235         if (!COMPAT_USE_64BIT_TIME) {
 236                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 237                         struct timeval *tv = (struct timeval *)data;
 238                         ctv.tv_sec = tv->tv_sec;
 239                         ctv.tv_usec = tv->tv_usec;
 240                         data = &ctv;
 241                         len = sizeof(ctv);
 242                 }
 243                 if (level == SOL_SOCKET &&
 244                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 245                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 246                         int i;
 247                         struct timespec *ts = (struct timespec *)data;
 248                         for (i = 0; i < count; i++) {
 249                                 cts[i].tv_sec = ts[i].tv_sec;
 250                                 cts[i].tv_nsec = ts[i].tv_nsec;
 251                         }
 252                         data = &cts;
 253                         len = sizeof(cts[0]) * count;
 254                 }
 255         }
 256
 257         cmlen = CMSG_COMPAT_LEN(len);
 258         if (kmsg->msg_controllen < cmlen) {
 259                 kmsg->msg_flags |= MSG_CTRUNC;
 260                 cmlen = kmsg->msg_controllen;
 261         }
 262         cmhdr.cmsg_level = level;
 263         cmhdr.cmsg_type = type;
 264         cmhdr.cmsg_len = cmlen;
 265
 266         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 267                 return -EFAULT;
 268         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 269                 return -EFAULT;
 270         cmlen = CMSG_COMPAT_SPACE(len);
 271         if (kmsg->msg_controllen < cmlen)
 272                 cmlen = kmsg->msg_controllen;
 273         kmsg->msg_control += cmlen;
 274         kmsg->msg_controllen -= cmlen;
 275         return 0;
 276 }
 277
 278 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 279 {
 280         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 281         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 282         int fdnum = scm->fp->count;
 283         struct file **fp = scm->fp->fp;
 284         int __user *cmfptr;
 285         int err = 0, i;
 286
 287         if (fdnum < fdmax)
 288                 fdmax = fdnum;
 289
 290         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 291                 int new_fd;
 292                 err = security_file_receive(fp[i]);
 293                 if (err)
 294                         break;
 295                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 296                                           ? O_CLOEXEC : 0);
 297                 if (err < 0)
 298                         break;
 299                 new_fd = err;
 300                 err = put_user(new_fd, cmfptr);
 301                 if (err) {
 302                         put_unused_fd(new_fd);
 303                         break;
 304                 }
 305                 /* Bump the usage count and install the file. */
 306                 fd_install(new_fd, get_file(fp[i]));
 307         }
 308
 309         if (i > 0) {
 310                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 311                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 312                 if (!err)
 313                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 314                 if (!err)
 315                         err = put_user(cmlen, &cm->cmsg_len);
 316                 if (!err) {
 317                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 318                         kmsg->msg_control += cmlen;
 319                         kmsg->msg_controllen -= cmlen;
 320                 }
 321         }
 322         if (i < fdnum)
 323                 kmsg->msg_flags |= MSG_CTRUNC;
 324
 325         /*
 326          * All of the files that fit in the message have had their
 327          * usage counts incremented, so we just free the list.
 328          */
 329         __scm_destroy(scm);
 330 }
 331
 332 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 333                                 char __user *optval, unsigned int optlen)
 334 {
 335         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 336         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 337         compat_uptr_t ptr;
 338         u16 len;
 339
 340         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 341             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 342             __get_user(len, &fprog32->len) ||
 343             __get_user(ptr, &fprog32->filter) ||
 344             __put_user(len, &kfprog->len) ||
 345             __put_user(compat_ptr(ptr), &kfprog->filter))
 346                 return -EFAULT;
 347
 348         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 349                               sizeof(struct sock_fprog));
 350 }
 351
 352 static int do_set_sock_timeout(struct socket *sock, int level,
 353                 int optname, char __user *optval, unsigned int optlen)
 354 {
 355         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 356         struct timeval ktime;
 357         mm_segment_t old_fs;
 358         int err;
 359
 360         if (optlen < sizeof(*up))
 361                 return -EINVAL;
 362         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 363             __get_user(ktime.tv_sec, &up->tv_sec) ||
 364             __get_user(ktime.tv_usec, &up->tv_usec))
 365                 return -EFAULT;
 366         old_fs = get_fs();
 367         set_fs(KERNEL_DS);
 368         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 369         set_fs(old_fs);
 370
 371         return err;
 372 }
 373
 374 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 375                                 char __user *optval, unsigned int optlen)
 376 {
 377         if (optname == SO_ATTACH_FILTER)
 378                 return do_set_attach_filter(sock, level, optname,
 379                                             optval, optlen);
 380         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 381                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 382
 383         return sock_setsockopt(sock, level, optname, optval, optlen);
 384 }
 385
 386 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 387                                 char __user *optval, unsigned int optlen)
 388 {
 389         int err;
 390         struct socket *sock = sockfd_lookup(fd, &err);
 391
 392         if (sock) {
 393                 err = security_socket_setsockopt(sock, level, optname);
 394                 if (err) {
 395                         sockfd_put(sock);
 396                         return err;
 397                 }
 398
 399                 if (level == SOL_SOCKET)
 400                         err = compat_sock_setsockopt(sock, level,
 401                                         optname, optval, optlen);
 402                 else if (sock->ops->compat_setsockopt)
 403                         err = sock->ops->compat_setsockopt(sock, level,
 404                                         optname, optval, optlen);
 405                 else
 406                         err = sock->ops->setsockopt(sock, level,
 407                                         optname, optval, optlen);
 408                 sockfd_put(sock);
 409         }
 410         return err;
 411 }
 412
 413 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 414                 char __user *optval, int __user *optlen)
 415 {
 416         struct compat_timeval __user *up;
 417         struct timeval ktime;
 418         mm_segment_t old_fs;
 419         int len, err;
 420
 421         up = (struct compat_timeval __user *) optval;
 422         if (get_user(len, optlen))
 423                 return -EFAULT;
 424         if (len < sizeof(*up))
 425                 return -EINVAL;
 426         len = sizeof(ktime);
 427         old_fs = get_fs();
 428         set_fs(KERNEL_DS);
 429         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 430         set_fs(old_fs);
 431
 432         if (!err) {
 433                 if (put_user(sizeof(*up), optlen) ||
 434                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 435                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 436                     __put_user(ktime.tv_usec, &up->tv_usec))
 437                         err = -EFAULT;
 438         }
 439         return err;
 440 }
 441
 442 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 443                                 char __user *optval, int __user *optlen)
 444 {
 445         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 446                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 447         return sock_getsockopt(sock, level, optname, optval, optlen);
 448 }
 449
 450 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 451 {
 452         struct compat_timeval __user *ctv;
 453         int err;
 454         struct timeval tv;
 455
 456         if (COMPAT_USE_64BIT_TIME)
 457                 return sock_get_timestamp(sk, userstamp);
 458
 459         ctv = (struct compat_timeval __user *) userstamp;
 460         err = -ENOENT;
 461         if (!sock_flag(sk, SOCK_TIMESTAMP))
 462                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 463         tv = ktime_to_timeval(sk->sk_stamp);
 464         if (tv.tv_sec == -1)
 465                 return err;
 466         if (tv.tv_sec == 0) {
 467                 sk->sk_stamp = ktime_get_real();
 468                 tv = ktime_to_timeval(sk->sk_stamp);
 469         }
 470         err = 0;
 471         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 472                         put_user(tv.tv_usec, &ctv->tv_usec))
 473                 err = -EFAULT;
 474         return err;
 475 }
 476 EXPORT_SYMBOL(compat_sock_get_timestamp);
 477
 478 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 479 {
 480         struct compat_timespec __user *ctv;
 481         int err;
 482         struct timespec ts;
 483
 484         if (COMPAT_USE_64BIT_TIME)
 485                 return sock_get_timestampns (sk, userstamp);
 486
 487         ctv = (struct compat_timespec __user *) userstamp;
 488         err = -ENOENT;
 489         if (!sock_flag(sk, SOCK_TIMESTAMP))
 490                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 491         ts = ktime_to_timespec(sk->sk_stamp);
 492         if (ts.tv_sec == -1)
 493                 return err;
 494         if (ts.tv_sec == 0) {
 495                 sk->sk_stamp = ktime_get_real();
 496                 ts = ktime_to_timespec(sk->sk_stamp);
 497         }
 498         err = 0;
 499         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 500                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 501                 err = -EFAULT;
 502         return err;
 503 }
 504 EXPORT_SYMBOL(compat_sock_get_timestampns);
 505
 506 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 507                                 char __user *optval, int __user *optlen)
 508 {
 509         int err;
 510         struct socket *sock = sockfd_lookup(fd, &err);
 511
 512         if (sock) {
 513                 err = security_socket_getsockopt(sock, level, optname);
 514                 if (err) {
 515                         sockfd_put(sock);
 516                         return err;
 517                 }
 518
 519                 if (level == SOL_SOCKET)
 520                         err = compat_sock_getsockopt(sock, level,
 521                                         optname, optval, optlen);
 522                 else if (sock->ops->compat_getsockopt)
 523                         err = sock->ops->compat_getsockopt(sock, level,
 524                                         optname, optval, optlen);
 525                 else
 526                         err = sock->ops->getsockopt(sock, level,
 527                                         optname, optval, optlen);
 528                 sockfd_put(sock);
 529         }
 530         return err;
 531 }
 532
 533 struct compat_group_req {
 534         __u32                            gr_interface;
 535         struct __kernel_sockaddr_storage gr_group
 536                 __attribute__ ((aligned(4)));
 537 } __packed;
 538
 539 struct compat_group_source_req {
 540         __u32                            gsr_interface;
 541         struct __kernel_sockaddr_storage gsr_group
 542                 __attribute__ ((aligned(4)));
 543         struct __kernel_sockaddr_storage gsr_source
 544                 __attribute__ ((aligned(4)));
 545 } __packed;
 546
 547 struct compat_group_filter {
 548         __u32                            gf_interface;
 549         struct __kernel_sockaddr_storage gf_group
 550                 __attribute__ ((aligned(4)));
 551         __u32                            gf_fmode;
 552         __u32                            gf_numsrc;
 553         struct __kernel_sockaddr_storage gf_slist[1]
 554                 __attribute__ ((aligned(4)));
 555 } __packed;
 556
 557 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 558                         sizeof(struct __kernel_sockaddr_storage))
 559
 560
 561 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 562         char __user *optval, unsigned int optlen,
 563         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 564 {
 565         char __user     *koptval = optval;
 566         int             koptlen = optlen;
 567
 568         switch (optname) {
 569         case MCAST_JOIN_GROUP:
 570         case MCAST_LEAVE_GROUP:
 571         {
 572                 struct compat_group_req __user *gr32 = (void *)optval;
 573                 struct group_req __user *kgr =
 574                         compat_alloc_user_space(sizeof(struct group_req));
 575                 u32 interface;
 576
 577                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 578                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 579                     __get_user(interface, &gr32->gr_interface) ||
 580                     __put_user(interface, &kgr->gr_interface) ||
 581                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 582                                 sizeof(kgr->gr_group)))
 583                         return -EFAULT;
 584                 koptval = (char __user *)kgr;
 585                 koptlen = sizeof(struct group_req);
 586                 break;
 587         }
 588         case MCAST_JOIN_SOURCE_GROUP:
 589         case MCAST_LEAVE_SOURCE_GROUP:
 590         case MCAST_BLOCK_SOURCE:
 591         case MCAST_UNBLOCK_SOURCE:
 592         {
 593                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 594                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 595                         sizeof(struct group_source_req));
 596                 u32 interface;
 597
 598                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 599                     !access_ok(VERIFY_WRITE, kgsr,
 600                         sizeof(struct group_source_req)) ||
 601                     __get_user(interface, &gsr32->gsr_interface) ||
 602                     __put_user(interface, &kgsr->gsr_interface) ||
 603                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 604                                 sizeof(kgsr->gsr_group)) ||
 605                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 606                                 sizeof(kgsr->gsr_source)))
 607                         return -EFAULT;
 608                 koptval = (char __user *)kgsr;
 609                 koptlen = sizeof(struct group_source_req);
 610                 break;
 611         }
 612         case MCAST_MSFILTER:
 613         {
 614                 struct compat_group_filter __user *gf32 = (void *)optval;
 615                 struct group_filter __user *kgf;
 616                 u32 interface, fmode, numsrc;
 617
 618                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 619                     __get_user(interface, &gf32->gf_interface) ||
 620                     __get_user(fmode, &gf32->gf_fmode) ||
 621                     __get_user(numsrc, &gf32->gf_numsrc))
 622                         return -EFAULT;
 623                 koptlen = optlen + sizeof(struct group_filter) -
 624                                 sizeof(struct compat_group_filter);
 625                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 626                         return -EINVAL;
 627                 kgf = compat_alloc_user_space(koptlen);
 628                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 629                     __put_user(interface, &kgf->gf_interface) ||
 630                     __put_user(fmode, &kgf->gf_fmode) ||
 631                     __put_user(numsrc, &kgf->gf_numsrc) ||
 632                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 633                                 sizeof(kgf->gf_group)) ||
 634                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 635                                 numsrc * sizeof(kgf->gf_slist[0]))))
 636                         return -EFAULT;
 637                 koptval = (char __user *)kgf;
 638                 break;
 639         }
 640
 641         default:
 642                 break;
 643         }
 644         return setsockopt(sock, level, optname, koptval, koptlen);
 645 }
 646 EXPORT_SYMBOL(compat_mc_setsockopt);
 647
 648 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 649         char __user *optval, int __user *optlen,
 650         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 651 {
 652         struct compat_group_filter __user *gf32 = (void *)optval;
 653         struct group_filter __user *kgf;
 654         int __user      *koptlen;
 655         u32 interface, fmode, numsrc;
 656         int klen, ulen, err;
 657
 658         if (optname != MCAST_MSFILTER)
 659                 return getsockopt(sock, level, optname, optval, optlen);
 660
 661         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 662         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 663             __get_user(ulen, optlen))
 664                 return -EFAULT;
 665
 666         /* adjust len for pad */
 667         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 668
 669         if (klen < GROUP_FILTER_SIZE(0))
 670                 return -EINVAL;
 671
 672         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 673             __put_user(klen, koptlen))
 674                 return -EFAULT;
 675
 676         /* have to allow space for previous compat_alloc_user_space, too */
 677         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 678
 679         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 680             __get_user(interface, &gf32->gf_interface) ||
 681             __get_user(fmode, &gf32->gf_fmode) ||
 682             __get_user(numsrc, &gf32->gf_numsrc) ||
 683             __put_user(interface, &kgf->gf_interface) ||
 684             __put_user(fmode, &kgf->gf_fmode) ||
 685             __put_user(numsrc, &kgf->gf_numsrc) ||
 686             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 687                 return -EFAULT;
 688
 689         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 690         if (err)
 691                 return err;
 692
 693         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 694             __get_user(klen, koptlen))
 695                 return -EFAULT;
 696
 697         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 698
 699         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 700             __put_user(ulen, optlen))
 701                 return -EFAULT;
 702
 703         if (!access_ok(VERIFY_READ, kgf, klen) ||
 704             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 705             __get_user(interface, &kgf->gf_interface) ||
 706             __get_user(fmode, &kgf->gf_fmode) ||
 707             __get_user(numsrc, &kgf->gf_numsrc) ||
 708             __put_user(interface, &gf32->gf_interface) ||
 709             __put_user(fmode, &gf32->gf_fmode) ||
 710             __put_user(numsrc, &gf32->gf_numsrc))
 711                 return -EFAULT;
 712         if (numsrc) {
 713                 int copylen;
 714
 715                 klen -= GROUP_FILTER_SIZE(0);
 716                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 717                 if (copylen > klen)
 718                         copylen = klen;
 719                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 720                         return -EFAULT;
 721         }
 722         return err;
 723 }
 724 EXPORT_SYMBOL(compat_mc_getsockopt);
 725
 726
 727 /* Argument list sizes for compat_sys_socketcall */
 728 #define AL(x) ((x) * sizeof(u32))
 729 static unsigned char nas[21] = {
 730         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 731         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 732         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 733         AL(4), AL(5), AL(4)
 734 };
 735 #undef AL
 736
 737 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 738 {
 739         if (flags & MSG_CMSG_COMPAT)
 740                 return -EINVAL;
 741         return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 742 }
 743
 744 asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 745                                     unsigned int vlen, unsigned int flags)
 746 {
 747         if (flags & MSG_CMSG_COMPAT)
 748                 return -EINVAL;
 749         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 750                               flags | MSG_CMSG_COMPAT);
 751 }
 752
 753 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 754 {
 755         if (flags & MSG_CMSG_COMPAT)
 756                 return -EINVAL;
 757         return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 758 }
 759
 760 asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
 761 {
 762         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 763 }
 764
 765 asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
 766                                     unsigned int flags, struct sockaddr __user *addr,
 767                                     int __user *addrlen)
 768 {
 769         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 770 }
 771
 772 asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 773                                     unsigned int vlen, unsigned int flags,
 774                                     struct compat_timespec __user *timeout)
 775 {
 776         int datagrams;
 777         struct timespec ktspec;
 778
 779         if (flags & MSG_CMSG_COMPAT)
 780                 return -EINVAL;
 781
 782         if (COMPAT_USE_64BIT_TIME)
 783                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 784                                       flags | MSG_CMSG_COMPAT,
 785                                       (struct timespec *) timeout);
 786
 787         if (timeout == NULL)
 788                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 789                                       flags | MSG_CMSG_COMPAT, NULL);
 790
 791         if (get_compat_timespec(&ktspec, timeout))
 792                 return -EFAULT;
 793
 794         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 795                                    flags | MSG_CMSG_COMPAT, &ktspec);
 796         if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
 797                 datagrams = -EFAULT;
 798
 799         return datagrams;
 800 }
 801
 802 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 803 {
 804         int ret;
 805         u32 a[6];
 806         u32 a0, a1;
 807
 808         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 809                 return -EINVAL;
 810         if (copy_from_user(a, args, nas[call]))
 811                 return -EFAULT;
 812         a0 = a[0];
 813         a1 = a[1];
 814
 815         switch (call) {
 816         case SYS_SOCKET:
 817                 ret = sys_socket(a0, a1, a[2]);
 818                 break;
 819         case SYS_BIND:
 820                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 821                 break;
 822         case SYS_CONNECT:
 823                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 824                 break;
 825         case SYS_LISTEN:
 826                 ret = sys_listen(a0, a1);
 827                 break;
 828         case SYS_ACCEPT:
 829                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 830                 break;
 831         case SYS_GETSOCKNAME:
 832                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 833                 break;
 834         case SYS_GETPEERNAME:
 835                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 836                 break;
 837         case SYS_SOCKETPAIR:
 838                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 839                 break;
 840         case SYS_SEND:
 841                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 842                 break;
 843         case SYS_SENDTO:
 844                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 845                 break;
 846         case SYS_RECV:
 847                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 848                 break;
 849         case SYS_RECVFROM:
 850                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 851                                           compat_ptr(a[4]), compat_ptr(a[5]));
 852                 break;
 853         case SYS_SHUTDOWN:
 854                 ret = sys_shutdown(a0, a1);
 855                 break;
 856         case SYS_SETSOCKOPT:
 857                 ret = compat_sys_setsockopt(a0, a1, a[2],
 858                                 compat_ptr(a[3]), a[4]);
 859                 break;
 860         case SYS_GETSOCKOPT:
 861                 ret = compat_sys_getsockopt(a0, a1, a[2],
 862                                 compat_ptr(a[3]), compat_ptr(a[4]));
 863                 break;
 864         case SYS_SENDMSG:
 865                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 866                 break;
 867         case SYS_SENDMMSG:
 868                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 869                 break;
 870         case SYS_RECVMSG:
 871                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 872                 break;
 873         case SYS_RECVMMSG:
 874                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 875                                           compat_ptr(a[4]));
 876                 break;
 877         case SYS_ACCEPT4:
 878                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 879                 break;
 880         default:
 881                 ret = -EINVAL;
 882                 break;
 883         }
 884         return ret;
 885 }