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 <linux/uaccess.h>
  32 #include <net/compat.h>
  33
  34 int get_compat_msghdr(struct msghdr *kmsg,
  35                       struct compat_msghdr __user *umsg,
  36                       struct sockaddr __user **save_addr,
  37                       struct iovec **iov)
  38 {
  39         compat_uptr_t uaddr, uiov, tmp3;
  40         compat_size_t nr_segs;
  41         ssize_t err;
  42
  43         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  44             __get_user(uaddr, &umsg->msg_name) ||
  45             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  46             __get_user(uiov, &umsg->msg_iov) ||
  47             __get_user(nr_segs, &umsg->msg_iovlen) ||
  48             __get_user(tmp3, &umsg->msg_control) ||
  49             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  50             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  51                 return -EFAULT;
  52
  53         if (!uaddr)
  54                 kmsg->msg_namelen = 0;
  55
  56         if (kmsg->msg_namelen < 0)
  57                 return -EINVAL;
  58
  59         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  60                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  61         kmsg->msg_control = compat_ptr(tmp3);
  62
  63         if (save_addr)
  64                 *save_addr = compat_ptr(uaddr);
  65
  66         if (uaddr && kmsg->msg_namelen) {
  67                 if (!save_addr) {
  68                         err = move_addr_to_kernel(compat_ptr(uaddr),
  69                                                   kmsg->msg_namelen,
  70                                                   kmsg->msg_name);
  71                         if (err < 0)
  72                                 return err;
  73                 }
  74         } else {
  75                 kmsg->msg_name = NULL;
  76                 kmsg->msg_namelen = 0;
  77         }
  78
  79         if (nr_segs > UIO_MAXIOV)
  80                 return -EMSGSIZE;
  81
  82         kmsg->msg_iocb = NULL;
  83
  84         return compat_import_iovec(save_addr ? READ : WRITE,
  85                                    compat_ptr(uiov), nr_segs,
  86                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
  87 }
  88
  89 /* Bleech... */
  90 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  91
  92 #define CMSG_COMPAT_DATA(cmsg)                          \
  93         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
  94 #define CMSG_COMPAT_SPACE(len)                          \
  95         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
  96 #define CMSG_COMPAT_LEN(len)                            \
  97         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
  98
  99 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 100         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 101          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 102          (struct compat_cmsghdr __user *)NULL)
 103
 104 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 105         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 106          (ucmlen) <= (unsigned long) \
 107          ((mhdr)->msg_controllen - \
 108           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 109
 110 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 111                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 112 {
 113         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 114         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 115                         msg->msg_controllen)
 116                 return NULL;
 117         return (struct compat_cmsghdr __user *)ptr;
 118 }
 119
 120 /* There is a lot of hair here because the alignment rules (and
 121  * thus placement) of cmsg headers and length are different for
 122  * 32-bit apps.  -DaveM
 123  */
 124 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 125                                unsigned char *stackbuf, int stackbuf_size)
 126 {
 127         struct compat_cmsghdr __user *ucmsg;
 128         struct cmsghdr *kcmsg, *kcmsg_base;
 129         compat_size_t ucmlen;
 130         __kernel_size_t kcmlen, tmp;
 131         int err = -EFAULT;
 132
 133         kcmlen = 0;
 134         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 135         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 136         while (ucmsg != NULL) {
 137                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 138                         return -EFAULT;
 139
 140                 /* Catch bogons. */
 141                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 142                         return -EINVAL;
 143
 144                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 145                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 146                 tmp = CMSG_ALIGN(tmp);
 147                 kcmlen += tmp;
 148                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 149         }
 150         if (kcmlen == 0)
 151                 return -EINVAL;
 152
 153         /* The kcmlen holds the 64-bit version of the control length.
 154          * It may not be modified as we do not stick it into the kmsg
 155          * until we have successfully copied over all of the data
 156          * from the user.
 157          */
 158         if (kcmlen > stackbuf_size)
 159                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 160         if (kcmsg == NULL)
 161                 return -ENOBUFS;
 162
 163         /* Now copy them over neatly. */
 164         memset(kcmsg, 0, kcmlen);
 165         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 166         while (ucmsg != NULL) {
 167                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 168                         goto Efault;
 169                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 170                         goto Einval;
 171                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 172                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 173                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 174                         goto Einval;
 175                 kcmsg->cmsg_len = tmp;
 176                 tmp = CMSG_ALIGN(tmp);
 177                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 178                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 179                     copy_from_user(CMSG_DATA(kcmsg),
 180                                    CMSG_COMPAT_DATA(ucmsg),
 181                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 182                         goto Efault;
 183
 184                 /* Advance. */
 185                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 186                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 187         }
 188
 189         /* Ok, looks like we made it.  Hook it up and return success. */
 190         kmsg->msg_control = kcmsg_base;
 191         kmsg->msg_controllen = kcmlen;
 192         return 0;
 193
 194 Einval:
 195         err = -EINVAL;
 196 Efault:
 197         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 198                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 199         return err;
 200 }
 201
 202 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 203 {
 204         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 205         struct compat_cmsghdr cmhdr;
 206         struct compat_timeval ctv;
 207         struct compat_timespec cts[3];
 208         int cmlen;
 209
 210         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 211                 kmsg->msg_flags |= MSG_CTRUNC;
 212                 return 0; /* XXX: return error? check spec. */
 213         }
 214
 215         if (!COMPAT_USE_64BIT_TIME) {
 216                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 217                         struct timeval *tv = (struct timeval *)data;
 218                         ctv.tv_sec = tv->tv_sec;
 219                         ctv.tv_usec = tv->tv_usec;
 220                         data = &ctv;
 221                         len = sizeof(ctv);
 222                 }
 223                 if (level == SOL_SOCKET &&
 224                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 225                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 226                         int i;
 227                         struct timespec *ts = (struct timespec *)data;
 228                         for (i = 0; i < count; i++) {
 229                                 cts[i].tv_sec = ts[i].tv_sec;
 230                                 cts[i].tv_nsec = ts[i].tv_nsec;
 231                         }
 232                         data = &cts;
 233                         len = sizeof(cts[0]) * count;
 234                 }
 235         }
 236
 237         cmlen = CMSG_COMPAT_LEN(len);
 238         if (kmsg->msg_controllen < cmlen) {
 239                 kmsg->msg_flags |= MSG_CTRUNC;
 240                 cmlen = kmsg->msg_controllen;
 241         }
 242         cmhdr.cmsg_level = level;
 243         cmhdr.cmsg_type = type;
 244         cmhdr.cmsg_len = cmlen;
 245
 246         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 247                 return -EFAULT;
 248         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 249                 return -EFAULT;
 250         cmlen = CMSG_COMPAT_SPACE(len);
 251         if (kmsg->msg_controllen < cmlen)
 252                 cmlen = kmsg->msg_controllen;
 253         kmsg->msg_control += cmlen;
 254         kmsg->msg_controllen -= cmlen;
 255         return 0;
 256 }
 257
 258 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 259 {
 260         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 261         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 262         int fdnum = scm->fp->count;
 263         struct file **fp = scm->fp->fp;
 264         int __user *cmfptr;
 265         int err = 0, i;
 266
 267         if (fdnum < fdmax)
 268                 fdmax = fdnum;
 269
 270         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 271                 int new_fd;
 272                 err = security_file_receive(fp[i]);
 273                 if (err)
 274                         break;
 275                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 276                                           ? O_CLOEXEC : 0);
 277                 if (err < 0)
 278                         break;
 279                 new_fd = err;
 280                 err = put_user(new_fd, cmfptr);
 281                 if (err) {
 282                         put_unused_fd(new_fd);
 283                         break;
 284                 }
 285                 /* Bump the usage count and install the file. */
 286                 fd_install(new_fd, get_file(fp[i]));
 287         }
 288
 289         if (i > 0) {
 290                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 291                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 292                 if (!err)
 293                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 294                 if (!err)
 295                         err = put_user(cmlen, &cm->cmsg_len);
 296                 if (!err) {
 297                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 298                         kmsg->msg_control += cmlen;
 299                         kmsg->msg_controllen -= cmlen;
 300                 }
 301         }
 302         if (i < fdnum)
 303                 kmsg->msg_flags |= MSG_CTRUNC;
 304
 305         /*
 306          * All of the files that fit in the message have had their
 307          * usage counts incremented, so we just free the list.
 308          */
 309         __scm_destroy(scm);
 310 }
 311
 312 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 313 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 314 {
 315         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 316         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 317         compat_uptr_t ptr;
 318         u16 len;
 319
 320         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 321             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 322             __get_user(len, &fprog32->len) ||
 323             __get_user(ptr, &fprog32->filter) ||
 324             __put_user(len, &kfprog->len) ||
 325             __put_user(compat_ptr(ptr), &kfprog->filter))
 326                 return NULL;
 327
 328         return kfprog;
 329 }
 330 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 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 sock_fprog __user *kfprog;
 336
 337         kfprog = get_compat_bpf_fprog(optval);
 338         if (!kfprog)
 339                 return -EFAULT;
 340
 341         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 342                               sizeof(struct sock_fprog));
 343 }
 344
 345 static int do_set_sock_timeout(struct socket *sock, int level,
 346                 int optname, char __user *optval, unsigned int optlen)
 347 {
 348         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 349         struct timeval ktime;
 350         mm_segment_t old_fs;
 351         int err;
 352
 353         if (optlen < sizeof(*up))
 354                 return -EINVAL;
 355         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 356             __get_user(ktime.tv_sec, &up->tv_sec) ||
 357             __get_user(ktime.tv_usec, &up->tv_usec))
 358                 return -EFAULT;
 359         old_fs = get_fs();
 360         set_fs(KERNEL_DS);
 361         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 362         set_fs(old_fs);
 363
 364         return err;
 365 }
 366
 367 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 368                                 char __user *optval, unsigned int optlen)
 369 {
 370         if (optname == SO_ATTACH_FILTER ||
 371             optname == SO_ATTACH_REUSEPORT_CBPF)
 372                 return do_set_attach_filter(sock, level, optname,
 373                                             optval, optlen);
 374         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 375                 return do_set_sock_timeout(sock, level, optname, optval, optlen);
 376
 377         return sock_setsockopt(sock, level, optname, optval, optlen);
 378 }
 379
 380 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 381                        char __user *, optval, unsigned int, optlen)
 382 {
 383         int err;
 384         struct socket *sock = sockfd_lookup(fd, &err);
 385
 386         if (sock) {
 387                 err = security_socket_setsockopt(sock, level, optname);
 388                 if (err) {
 389                         sockfd_put(sock);
 390                         return err;
 391                 }
 392
 393                 if (level == SOL_SOCKET)
 394                         err = compat_sock_setsockopt(sock, level,
 395                                         optname, optval, optlen);
 396                 else if (sock->ops->compat_setsockopt)
 397                         err = sock->ops->compat_setsockopt(sock, level,
 398                                         optname, optval, optlen);
 399                 else
 400                         err = sock->ops->setsockopt(sock, level,
 401                                         optname, optval, optlen);
 402                 sockfd_put(sock);
 403         }
 404         return err;
 405 }
 406
 407 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 408                 char __user *optval, int __user *optlen)
 409 {
 410         struct compat_timeval __user *up;
 411         struct timeval ktime;
 412         mm_segment_t old_fs;
 413         int len, err;
 414
 415         up = (struct compat_timeval __user *) optval;
 416         if (get_user(len, optlen))
 417                 return -EFAULT;
 418         if (len < sizeof(*up))
 419                 return -EINVAL;
 420         len = sizeof(ktime);
 421         old_fs = get_fs();
 422         set_fs(KERNEL_DS);
 423         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 424         set_fs(old_fs);
 425
 426         if (!err) {
 427                 if (put_user(sizeof(*up), optlen) ||
 428                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 429                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 430                     __put_user(ktime.tv_usec, &up->tv_usec))
 431                         err = -EFAULT;
 432         }
 433         return err;
 434 }
 435
 436 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 437                                 char __user *optval, int __user *optlen)
 438 {
 439         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 440                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 441         return sock_getsockopt(sock, level, optname, optval, optlen);
 442 }
 443
 444 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 445 {
 446         struct compat_timeval __user *ctv;
 447         int err;
 448         struct timeval tv;
 449
 450         if (COMPAT_USE_64BIT_TIME)
 451                 return sock_get_timestamp(sk, userstamp);
 452
 453         ctv = (struct compat_timeval __user *) userstamp;
 454         err = -ENOENT;
 455         if (!sock_flag(sk, SOCK_TIMESTAMP))
 456                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 457         tv = ktime_to_timeval(sk->sk_stamp);
 458         if (tv.tv_sec == -1)
 459                 return err;
 460         if (tv.tv_sec == 0) {
 461                 sk->sk_stamp = ktime_get_real();
 462                 tv = ktime_to_timeval(sk->sk_stamp);
 463         }
 464         err = 0;
 465         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 466                         put_user(tv.tv_usec, &ctv->tv_usec))
 467                 err = -EFAULT;
 468         return err;
 469 }
 470 EXPORT_SYMBOL(compat_sock_get_timestamp);
 471
 472 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 473 {
 474         struct compat_timespec __user *ctv;
 475         int err;
 476         struct timespec ts;
 477
 478         if (COMPAT_USE_64BIT_TIME)
 479                 return sock_get_timestampns (sk, userstamp);
 480
 481         ctv = (struct compat_timespec __user *) userstamp;
 482         err = -ENOENT;
 483         if (!sock_flag(sk, SOCK_TIMESTAMP))
 484                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 485         ts = ktime_to_timespec(sk->sk_stamp);
 486         if (ts.tv_sec == -1)
 487                 return err;
 488         if (ts.tv_sec == 0) {
 489                 sk->sk_stamp = ktime_get_real();
 490                 ts = ktime_to_timespec(sk->sk_stamp);
 491         }
 492         err = 0;
 493         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 494                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 495                 err = -EFAULT;
 496         return err;
 497 }
 498 EXPORT_SYMBOL(compat_sock_get_timestampns);
 499
 500 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 501                        char __user *, optval, int __user *, optlen)
 502 {
 503         int err;
 504         struct socket *sock = sockfd_lookup(fd, &err);
 505
 506         if (sock) {
 507                 err = security_socket_getsockopt(sock, level, optname);
 508                 if (err) {
 509                         sockfd_put(sock);
 510                         return err;
 511                 }
 512
 513                 if (level == SOL_SOCKET)
 514                         err = compat_sock_getsockopt(sock, level,
 515                                         optname, optval, optlen);
 516                 else if (sock->ops->compat_getsockopt)
 517                         err = sock->ops->compat_getsockopt(sock, level,
 518                                         optname, optval, optlen);
 519                 else
 520                         err = sock->ops->getsockopt(sock, level,
 521                                         optname, optval, optlen);
 522                 sockfd_put(sock);
 523         }
 524         return err;
 525 }
 526
 527 struct compat_group_req {
 528         __u32                            gr_interface;
 529         struct __kernel_sockaddr_storage gr_group
 530                 __aligned(4);
 531 } __packed;
 532
 533 struct compat_group_source_req {
 534         __u32                            gsr_interface;
 535         struct __kernel_sockaddr_storage gsr_group
 536                 __aligned(4);
 537         struct __kernel_sockaddr_storage gsr_source
 538                 __aligned(4);
 539 } __packed;
 540
 541 struct compat_group_filter {
 542         __u32                            gf_interface;
 543         struct __kernel_sockaddr_storage gf_group
 544                 __aligned(4);
 545         __u32                            gf_fmode;
 546         __u32                            gf_numsrc;
 547         struct __kernel_sockaddr_storage gf_slist[1]
 548                 __aligned(4);
 549 } __packed;
 550
 551 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 552                         sizeof(struct __kernel_sockaddr_storage))
 553
 554
 555 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 556         char __user *optval, unsigned int optlen,
 557         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 558 {
 559         char __user     *koptval = optval;
 560         int             koptlen = optlen;
 561
 562         switch (optname) {
 563         case MCAST_JOIN_GROUP:
 564         case MCAST_LEAVE_GROUP:
 565         {
 566                 struct compat_group_req __user *gr32 = (void *)optval;
 567                 struct group_req __user *kgr =
 568                         compat_alloc_user_space(sizeof(struct group_req));
 569                 u32 interface;
 570
 571                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 572                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 573                     __get_user(interface, &gr32->gr_interface) ||
 574                     __put_user(interface, &kgr->gr_interface) ||
 575                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 576                                 sizeof(kgr->gr_group)))
 577                         return -EFAULT;
 578                 koptval = (char __user *)kgr;
 579                 koptlen = sizeof(struct group_req);
 580                 break;
 581         }
 582         case MCAST_JOIN_SOURCE_GROUP:
 583         case MCAST_LEAVE_SOURCE_GROUP:
 584         case MCAST_BLOCK_SOURCE:
 585         case MCAST_UNBLOCK_SOURCE:
 586         {
 587                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 588                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 589                         sizeof(struct group_source_req));
 590                 u32 interface;
 591
 592                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 593                     !access_ok(VERIFY_WRITE, kgsr,
 594                         sizeof(struct group_source_req)) ||
 595                     __get_user(interface, &gsr32->gsr_interface) ||
 596                     __put_user(interface, &kgsr->gsr_interface) ||
 597                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 598                                 sizeof(kgsr->gsr_group)) ||
 599                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 600                                 sizeof(kgsr->gsr_source)))
 601                         return -EFAULT;
 602                 koptval = (char __user *)kgsr;
 603                 koptlen = sizeof(struct group_source_req);
 604                 break;
 605         }
 606         case MCAST_MSFILTER:
 607         {
 608                 struct compat_group_filter __user *gf32 = (void *)optval;
 609                 struct group_filter __user *kgf;
 610                 u32 interface, fmode, numsrc;
 611
 612                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 613                     __get_user(interface, &gf32->gf_interface) ||
 614                     __get_user(fmode, &gf32->gf_fmode) ||
 615                     __get_user(numsrc, &gf32->gf_numsrc))
 616                         return -EFAULT;
 617                 koptlen = optlen + sizeof(struct group_filter) -
 618                                 sizeof(struct compat_group_filter);
 619                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 620                         return -EINVAL;
 621                 kgf = compat_alloc_user_space(koptlen);
 622                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 623                     __put_user(interface, &kgf->gf_interface) ||
 624                     __put_user(fmode, &kgf->gf_fmode) ||
 625                     __put_user(numsrc, &kgf->gf_numsrc) ||
 626                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 627                                 sizeof(kgf->gf_group)) ||
 628                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 629                                 numsrc * sizeof(kgf->gf_slist[0]))))
 630                         return -EFAULT;
 631                 koptval = (char __user *)kgf;
 632                 break;
 633         }
 634
 635         default:
 636                 break;
 637         }
 638         return setsockopt(sock, level, optname, koptval, koptlen);
 639 }
 640 EXPORT_SYMBOL(compat_mc_setsockopt);
 641
 642 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 643         char __user *optval, int __user *optlen,
 644         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 645 {
 646         struct compat_group_filter __user *gf32 = (void *)optval;
 647         struct group_filter __user *kgf;
 648         int __user      *koptlen;
 649         u32 interface, fmode, numsrc;
 650         int klen, ulen, err;
 651
 652         if (optname != MCAST_MSFILTER)
 653                 return getsockopt(sock, level, optname, optval, optlen);
 654
 655         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 656         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 657             __get_user(ulen, optlen))
 658                 return -EFAULT;
 659
 660         /* adjust len for pad */
 661         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 662
 663         if (klen < GROUP_FILTER_SIZE(0))
 664                 return -EINVAL;
 665
 666         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 667             __put_user(klen, koptlen))
 668                 return -EFAULT;
 669
 670         /* have to allow space for previous compat_alloc_user_space, too */
 671         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 672
 673         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 674             __get_user(interface, &gf32->gf_interface) ||
 675             __get_user(fmode, &gf32->gf_fmode) ||
 676             __get_user(numsrc, &gf32->gf_numsrc) ||
 677             __put_user(interface, &kgf->gf_interface) ||
 678             __put_user(fmode, &kgf->gf_fmode) ||
 679             __put_user(numsrc, &kgf->gf_numsrc) ||
 680             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 681                 return -EFAULT;
 682
 683         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 684         if (err)
 685                 return err;
 686
 687         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 688             __get_user(klen, koptlen))
 689                 return -EFAULT;
 690
 691         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 692
 693         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 694             __put_user(ulen, optlen))
 695                 return -EFAULT;
 696
 697         if (!access_ok(VERIFY_READ, kgf, klen) ||
 698             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 699             __get_user(interface, &kgf->gf_interface) ||
 700             __get_user(fmode, &kgf->gf_fmode) ||
 701             __get_user(numsrc, &kgf->gf_numsrc) ||
 702             __put_user(interface, &gf32->gf_interface) ||
 703             __put_user(fmode, &gf32->gf_fmode) ||
 704             __put_user(numsrc, &gf32->gf_numsrc))
 705                 return -EFAULT;
 706         if (numsrc) {
 707                 int copylen;
 708
 709                 klen -= GROUP_FILTER_SIZE(0);
 710                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 711                 if (copylen > klen)
 712                         copylen = klen;
 713                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 714                         return -EFAULT;
 715         }
 716         return err;
 717 }
 718 EXPORT_SYMBOL(compat_mc_getsockopt);
 719
 720
 721 /* Argument list sizes for compat_sys_socketcall */
 722 #define AL(x) ((x) * sizeof(u32))
 723 static unsigned char nas[21] = {
 724         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 725         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 726         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 727         AL(4), AL(5), AL(4)
 728 };
 729 #undef AL
 730
 731 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 732 {
 733         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 734 }
 735
 736 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 737                        unsigned int, vlen, unsigned int, flags)
 738 {
 739         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 740                               flags | MSG_CMSG_COMPAT);
 741 }
 742
 743 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 744 {
 745         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 746 }
 747
 748 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 749 {
 750         return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 751 }
 752
 753 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 754                        unsigned int, flags, struct sockaddr __user *, addr,
 755                        int __user *, addrlen)
 756 {
 757         return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 758 }
 759
 760 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 761                        unsigned int, vlen, unsigned int, flags,
 762                        struct compat_timespec __user *, timeout)
 763 {
 764         int datagrams;
 765         struct timespec ktspec;
 766
 767         if (timeout == NULL)
 768                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 769                                       flags | MSG_CMSG_COMPAT, NULL);
 770
 771         if (compat_get_timespec(&ktspec, timeout))
 772                 return -EFAULT;
 773
 774         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 775                                    flags | MSG_CMSG_COMPAT, &ktspec);
 776         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 777                 datagrams = -EFAULT;
 778
 779         return datagrams;
 780 }
 781
 782 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 783 {
 784         int ret;
 785         u32 a[6];
 786         u32 a0, a1;
 787
 788         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 789                 return -EINVAL;
 790         if (copy_from_user(a, args, nas[call]))
 791                 return -EFAULT;
 792         a0 = a[0];
 793         a1 = a[1];
 794
 795         switch (call) {
 796         case SYS_SOCKET:
 797                 ret = sys_socket(a0, a1, a[2]);
 798                 break;
 799         case SYS_BIND:
 800                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 801                 break;
 802         case SYS_CONNECT:
 803                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 804                 break;
 805         case SYS_LISTEN:
 806                 ret = sys_listen(a0, a1);
 807                 break;
 808         case SYS_ACCEPT:
 809                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 810                 break;
 811         case SYS_GETSOCKNAME:
 812                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 813                 break;
 814         case SYS_GETPEERNAME:
 815                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 816                 break;
 817         case SYS_SOCKETPAIR:
 818                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 819                 break;
 820         case SYS_SEND:
 821                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 822                 break;
 823         case SYS_SENDTO:
 824                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 825                 break;
 826         case SYS_RECV:
 827                 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 828                 break;
 829         case SYS_RECVFROM:
 830                 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 831                                           compat_ptr(a[4]), compat_ptr(a[5]));
 832                 break;
 833         case SYS_SHUTDOWN:
 834                 ret = sys_shutdown(a0, a1);
 835                 break;
 836         case SYS_SETSOCKOPT:
 837                 ret = compat_sys_setsockopt(a0, a1, a[2],
 838                                 compat_ptr(a[3]), a[4]);
 839                 break;
 840         case SYS_GETSOCKOPT:
 841                 ret = compat_sys_getsockopt(a0, a1, a[2],
 842                                 compat_ptr(a[3]), compat_ptr(a[4]));
 843                 break;
 844         case SYS_SENDMSG:
 845                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 846                 break;
 847         case SYS_SENDMMSG:
 848                 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 849                 break;
 850         case SYS_RECVMSG:
 851                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 852                 break;
 853         case SYS_RECVMMSG:
 854                 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 855                                           compat_ptr(a[4]));
 856                 break;
 857         case SYS_ACCEPT4:
 858                 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 859                 break;
 860         default:
 861                 ret = -EINVAL;
 862                 break;
 863         }
 864         return ret;
 865 }