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