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