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