net/compat.c

   1 /*
   2  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3  *
   4  * Copyright (C) 2000           VA Linux Co
   5  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9  * Copyright (C) 2000           Hewlett-Packard Co.
  10  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/gfp.h>
  16 #include <linux/fs.h>
  17 #include <linux/types.h>
  18 #include <linux/file.h>
  19 #include <linux/icmpv6.h>
  20 #include <linux/socket.h>
  21 #include <linux/syscalls.h>
  22 #include <linux/filter.h>
  23 #include <linux/compat.h>
  24 #include <linux/security.h>
  25 #include <linux/audit.h>
  26 #include <linux/export.h>
  27
  28 #include <net/scm.h>
  29 #include <net/sock.h>
  30 #include <net/ip.h>
  31 #include <net/ipv6.h>
  32 #include <linux/uaccess.h>
  33 #include <net/compat.h>
  34
  35 int get_compat_msghdr(struct msghdr *kmsg,
  36                       struct compat_msghdr __user *umsg,
  37                       struct sockaddr __user **save_addr,
  38                       struct iovec **iov)
  39 {
  40         struct compat_msghdr msg;
  41         ssize_t err;
  42
  43         if (copy_from_user(&msg, umsg, sizeof(*umsg)))
  44                 return -EFAULT;
  45
  46         kmsg->msg_flags = msg.msg_flags;
  47         kmsg->msg_namelen = msg.msg_namelen;
  48
  49         if (!msg.msg_name)
  50                 kmsg->msg_namelen = 0;
  51
  52         if (kmsg->msg_namelen < 0)
  53                 return -EINVAL;
  54
  55         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  56                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  57
  58         kmsg->msg_control = compat_ptr(msg.msg_control);
  59         kmsg->msg_controllen = msg.msg_controllen;
  60
  61         if (save_addr)
  62                 *save_addr = compat_ptr(msg.msg_name);
  63
  64         if (msg.msg_name && kmsg->msg_namelen) {
  65                 if (!save_addr) {
  66                         err = move_addr_to_kernel(compat_ptr(msg.msg_name),
  67                                                   kmsg->msg_namelen,
  68                                                   kmsg->msg_name);
  69                         if (err < 0)
  70                                 return err;
  71                 }
  72         } else {
  73                 kmsg->msg_name = NULL;
  74                 kmsg->msg_namelen = 0;
  75         }
  76
  77         if (msg.msg_iovlen > UIO_MAXIOV)
  78                 return -EMSGSIZE;
  79
  80         kmsg->msg_iocb = NULL;
  81
  82         return compat_import_iovec(save_addr ? READ : WRITE,
  83                                    compat_ptr(msg.msg_iov), msg.msg_iovlen,
  84                                    UIO_FASTIOV, iov, &kmsg->msg_iter);
  85 }
  86
  87 /* Bleech... */
  88 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  89
  90 #define CMSG_COMPAT_DATA(cmsg)                          \
  91         ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
  92 #define CMSG_COMPAT_SPACE(len)                          \
  93         (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
  94 #define CMSG_COMPAT_LEN(len)                            \
  95         (sizeof(struct compat_cmsghdr) + (len))
  96
  97 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
  98         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
  99          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 100          (struct compat_cmsghdr __user *)NULL)
 101
 102 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 103         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 104          (ucmlen) <= (unsigned long) \
 105          ((mhdr)->msg_controllen - \
 106           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 107
 108 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 109                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 110 {
 111         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 112         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 113                         msg->msg_controllen)
 114                 return NULL;
 115         return (struct compat_cmsghdr __user *)ptr;
 116 }
 117
 118 /* There is a lot of hair here because the alignment rules (and
 119  * thus placement) of cmsg headers and length are different for
 120  * 32-bit apps.  -DaveM
 121  */
 122 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 123                                unsigned char *stackbuf, int stackbuf_size)
 124 {
 125         struct compat_cmsghdr __user *ucmsg;
 126         struct cmsghdr *kcmsg, *kcmsg_base;
 127         compat_size_t ucmlen;
 128         __kernel_size_t kcmlen, tmp;
 129         int err = -EFAULT;
 130
 131         BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
 132                      CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
 133
 134         kcmlen = 0;
 135         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 136         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 137         while (ucmsg != NULL) {
 138                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 139                         return -EFAULT;
 140
 141                 /* Catch bogons. */
 142                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 143                         return -EINVAL;
 144
 145                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 146                 tmp = CMSG_ALIGN(tmp);
 147                 kcmlen += tmp;
 148                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 149         }
 150         if (kcmlen == 0)
 151                 return -EINVAL;
 152
 153         /* The kcmlen holds the 64-bit version of the control length.
 154          * It may not be modified as we do not stick it into the kmsg
 155          * until we have successfully copied over all of the data
 156          * from the user.
 157          */
 158         if (kcmlen > stackbuf_size)
 159                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 160         if (kcmsg == NULL)
 161                 return -ENOBUFS;
 162
 163         /* Now copy them over neatly. */
 164         memset(kcmsg, 0, kcmlen);
 165         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 166         while (ucmsg != NULL) {
 167                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 168                         goto Efault;
 169                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 170                         goto Einval;
 171                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 172                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 173                         goto Einval;
 174                 kcmsg->cmsg_len = tmp;
 175                 tmp = CMSG_ALIGN(tmp);
 176                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 177                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 178                     copy_from_user(CMSG_DATA(kcmsg),
 179                                    CMSG_COMPAT_DATA(ucmsg),
 180                                    (ucmlen - sizeof(*ucmsg))))
 181                         goto Efault;
 182
 183                 /* Advance. */
 184                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 185                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 186         }
 187
 188         /*
 189          * check the length of messages copied in is the same as the
 190          * what we get from the first loop
 191          */
 192         if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
 193                 goto Einval;
 194
 195         /* Ok, looks like we made it.  Hook it up and return success. */
 196         kmsg->msg_control = kcmsg_base;
 197         kmsg->msg_controllen = kcmlen;
 198         return 0;
 199
 200 Einval:
 201         err = -EINVAL;
 202 Efault:
 203         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 204                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 205         return err;
 206 }
 207
 208 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 209 {
 210         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 211         struct compat_cmsghdr cmhdr;
 212         struct compat_timeval ctv;
 213         struct compat_timespec cts[3];
 214         int cmlen;
 215
 216         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 217                 kmsg->msg_flags |= MSG_CTRUNC;
 218                 return 0; /* XXX: return error? check spec. */
 219         }
 220
 221         if (!COMPAT_USE_64BIT_TIME) {
 222                 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 223                         struct timeval *tv = (struct timeval *)data;
 224                         ctv.tv_sec = tv->tv_sec;
 225                         ctv.tv_usec = tv->tv_usec;
 226                         data = &ctv;
 227                         len = sizeof(ctv);
 228                 }
 229                 if (level == SOL_SOCKET &&
 230                     (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 231                         int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 232                         int i;
 233                         struct timespec *ts = (struct timespec *)data;
 234                         for (i = 0; i < count; i++) {
 235                                 cts[i].tv_sec = ts[i].tv_sec;
 236                                 cts[i].tv_nsec = ts[i].tv_nsec;
 237                         }
 238                         data = &cts;
 239                         len = sizeof(cts[0]) * count;
 240                 }
 241         }
 242
 243         cmlen = CMSG_COMPAT_LEN(len);
 244         if (kmsg->msg_controllen < cmlen) {
 245                 kmsg->msg_flags |= MSG_CTRUNC;
 246                 cmlen = kmsg->msg_controllen;
 247         }
 248         cmhdr.cmsg_level = level;
 249         cmhdr.cmsg_type = type;
 250         cmhdr.cmsg_len = cmlen;
 251
 252         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 253                 return -EFAULT;
 254         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 255                 return -EFAULT;
 256         cmlen = CMSG_COMPAT_SPACE(len);
 257         if (kmsg->msg_controllen < cmlen)
 258                 cmlen = kmsg->msg_controllen;
 259         kmsg->msg_control += cmlen;
 260         kmsg->msg_controllen -= cmlen;
 261         return 0;
 262 }
 263
 264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 265 {
 266         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 267         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 268         int fdnum = scm->fp->count;
 269         struct file **fp = scm->fp->fp;
 270         int __user *cmfptr;
 271         int err = 0, i;
 272
 273         if (fdnum < fdmax)
 274                 fdmax = fdnum;
 275
 276         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 277                 int new_fd;
 278                 err = security_file_receive(fp[i]);
 279                 if (err)
 280                         break;
 281                 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 282                                           ? O_CLOEXEC : 0);
 283                 if (err < 0)
 284                         break;
 285                 new_fd = err;
 286                 err = put_user(new_fd, cmfptr);
 287                 if (err) {
 288                         put_unused_fd(new_fd);
 289                         break;
 290                 }
 291                 /* Bump the usage count and install the file. */
 292                 fd_install(new_fd, get_file(fp[i]));
 293         }
 294
 295         if (i > 0) {
 296                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 297                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 298                 if (!err)
 299                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 300                 if (!err)
 301                         err = put_user(cmlen, &cm->cmsg_len);
 302                 if (!err) {
 303                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 304                         kmsg->msg_control += cmlen;
 305                         kmsg->msg_controllen -= cmlen;
 306                 }
 307         }
 308         if (i < fdnum)
 309                 kmsg->msg_flags |= MSG_CTRUNC;
 310
 311         /*
 312          * All of the files that fit in the message have had their
 313          * usage counts incremented, so we just free the list.
 314          */
 315         __scm_destroy(scm);
 316 }
 317
 318 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 319 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 320 {
 321         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 322         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 323         struct compat_sock_fprog f32;
 324         struct sock_fprog f;
 325
 326         if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
 327                 return NULL;
 328         memset(&f, 0, sizeof(f));
 329         f.len = f32.len;
 330         f.filter = compat_ptr(f32.filter);
 331         if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
 332                 return NULL;
 333
 334         return kfprog;
 335 }
 336 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 337
 338 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 339                                 char __user *optval, unsigned int optlen)
 340 {
 341         struct sock_fprog __user *kfprog;
 342
 343         kfprog = get_compat_bpf_fprog(optval);
 344         if (!kfprog)
 345                 return -EFAULT;
 346
 347         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 348                               sizeof(struct sock_fprog));
 349 }
 350
 351 static int do_set_sock_timeout(struct socket *sock, int level,
 352                 int optname, char __user *optval, unsigned int optlen)
 353 {
 354         struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 355         struct timeval ktime;
 356         mm_segment_t old_fs;
 357         int err;
 358
 359         if (optlen < sizeof(*up))
 360                 return -EINVAL;
 361         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 362             __get_user(ktime.tv_sec, &up->tv_sec) ||
 363             __get_user(ktime.tv_usec, &up->tv_usec))
 364                 return -EFAULT;
 365         old_fs = get_fs();
 366         set_fs(KERNEL_DS);
 367         err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 368         set_fs(old_fs);
 369
 370         return err;
 371 }
 372
 373 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 374                                 char __user *optval, unsigned int optlen)
 375 {
 376         if (optname == SO_ATTACH_FILTER ||
 377             optname == SO_ATTACH_REUSEPORT_CBPF)
 378                 return do_set_attach_filter(sock, level, optname,
 379                                             optval, optlen);
 380         if (!COMPAT_USE_64BIT_TIME &&
 381             (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 static int __compat_sys_setsockopt(int fd, int level, int optname,
 388                                    char __user *optval, unsigned int optlen)
 389 {
 390         int err;
 391         struct socket *sock = sockfd_lookup(fd, &err);
 392
 393         if (sock) {
 394                 err = security_socket_setsockopt(sock, level, optname);
 395                 if (err) {
 396                         sockfd_put(sock);
 397                         return err;
 398                 }
 399
 400                 if (level == SOL_SOCKET)
 401                         err = compat_sock_setsockopt(sock, level,
 402                                         optname, optval, optlen);
 403                 else if (sock->ops->compat_setsockopt)
 404                         err = sock->ops->compat_setsockopt(sock, level,
 405                                         optname, optval, optlen);
 406                 else
 407                         err = sock->ops->setsockopt(sock, level,
 408                                         optname, optval, optlen);
 409                 sockfd_put(sock);
 410         }
 411         return err;
 412 }
 413
 414 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 415                        char __user *, optval, unsigned int, optlen)
 416 {
 417         return __compat_sys_setsockopt(fd, level, optname, optval, optlen);
 418 }
 419
 420 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 421                 char __user *optval, int __user *optlen)
 422 {
 423         struct compat_timeval __user *up;
 424         struct timeval ktime;
 425         mm_segment_t old_fs;
 426         int len, err;
 427
 428         up = (struct compat_timeval __user *) optval;
 429         if (get_user(len, optlen))
 430                 return -EFAULT;
 431         if (len < sizeof(*up))
 432                 return -EINVAL;
 433         len = sizeof(ktime);
 434         old_fs = get_fs();
 435         set_fs(KERNEL_DS);
 436         err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 437         set_fs(old_fs);
 438
 439         if (!err) {
 440                 if (put_user(sizeof(*up), optlen) ||
 441                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 442                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 443                     __put_user(ktime.tv_usec, &up->tv_usec))
 444                         err = -EFAULT;
 445         }
 446         return err;
 447 }
 448
 449 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 450                                 char __user *optval, int __user *optlen)
 451 {
 452         if (!COMPAT_USE_64BIT_TIME &&
 453             (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
 454                 return do_get_sock_timeout(sock, level, optname, optval, optlen);
 455         return sock_getsockopt(sock, level, optname, optval, optlen);
 456 }
 457
 458 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 459 {
 460         struct compat_timeval __user *ctv;
 461         int err;
 462         struct timeval tv;
 463
 464         if (COMPAT_USE_64BIT_TIME)
 465                 return sock_get_timestamp(sk, userstamp);
 466
 467         ctv = (struct compat_timeval __user *) userstamp;
 468         err = -ENOENT;
 469         if (!sock_flag(sk, SOCK_TIMESTAMP))
 470                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 471         tv = ktime_to_timeval(sk->sk_stamp);
 472         if (tv.tv_sec == -1)
 473                 return err;
 474         if (tv.tv_sec == 0) {
 475                 sk->sk_stamp = ktime_get_real();
 476                 tv = ktime_to_timeval(sk->sk_stamp);
 477         }
 478         err = 0;
 479         if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 480                         put_user(tv.tv_usec, &ctv->tv_usec))
 481                 err = -EFAULT;
 482         return err;
 483 }
 484 EXPORT_SYMBOL(compat_sock_get_timestamp);
 485
 486 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 487 {
 488         struct compat_timespec __user *ctv;
 489         int err;
 490         struct timespec ts;
 491
 492         if (COMPAT_USE_64BIT_TIME)
 493                 return sock_get_timestampns (sk, userstamp);
 494
 495         ctv = (struct compat_timespec __user *) userstamp;
 496         err = -ENOENT;
 497         if (!sock_flag(sk, SOCK_TIMESTAMP))
 498                 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 499         ts = ktime_to_timespec(sk->sk_stamp);
 500         if (ts.tv_sec == -1)
 501                 return err;
 502         if (ts.tv_sec == 0) {
 503                 sk->sk_stamp = ktime_get_real();
 504                 ts = ktime_to_timespec(sk->sk_stamp);
 505         }
 506         err = 0;
 507         if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 508                         put_user(ts.tv_nsec, &ctv->tv_nsec))
 509                 err = -EFAULT;
 510         return err;
 511 }
 512 EXPORT_SYMBOL(compat_sock_get_timestampns);
 513
 514 static int __compat_sys_getsockopt(int fd, int level, int optname,
 515                                    char __user *optval,
 516                                    int __user *optlen)
 517 {
 518         int err;
 519         struct socket *sock = sockfd_lookup(fd, &err);
 520
 521         if (sock) {
 522                 err = security_socket_getsockopt(sock, level, optname);
 523                 if (err) {
 524                         sockfd_put(sock);
 525                         return err;
 526                 }
 527
 528                 if (level == SOL_SOCKET)
 529                         err = compat_sock_getsockopt(sock, level,
 530                                         optname, optval, optlen);
 531                 else if (sock->ops->compat_getsockopt)
 532                         err = sock->ops->compat_getsockopt(sock, level,
 533                                         optname, optval, optlen);
 534                 else
 535                         err = sock->ops->getsockopt(sock, level,
 536                                         optname, optval, optlen);
 537                 sockfd_put(sock);
 538         }
 539         return err;
 540 }
 541
 542 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 543                        char __user *, optval, int __user *, optlen)
 544 {
 545         return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
 546 }
 547
 548 struct compat_group_req {
 549         __u32                            gr_interface;
 550         struct __kernel_sockaddr_storage gr_group
 551                 __aligned(4);
 552 } __packed;
 553
 554 struct compat_group_source_req {
 555         __u32                            gsr_interface;
 556         struct __kernel_sockaddr_storage gsr_group
 557                 __aligned(4);
 558         struct __kernel_sockaddr_storage gsr_source
 559                 __aligned(4);
 560 } __packed;
 561
 562 struct compat_group_filter {
 563         __u32                            gf_interface;
 564         struct __kernel_sockaddr_storage gf_group
 565                 __aligned(4);
 566         __u32                            gf_fmode;
 567         __u32                            gf_numsrc;
 568         struct __kernel_sockaddr_storage gf_slist[1]
 569                 __aligned(4);
 570 } __packed;
 571
 572 #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 573                         sizeof(struct __kernel_sockaddr_storage))
 574
 575
 576 int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 577         char __user *optval, unsigned int optlen,
 578         int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 579 {
 580         char __user     *koptval = optval;
 581         int             koptlen = optlen;
 582
 583         switch (optname) {
 584         case MCAST_JOIN_GROUP:
 585         case MCAST_LEAVE_GROUP:
 586         {
 587                 struct compat_group_req __user *gr32 = (void *)optval;
 588                 struct group_req __user *kgr =
 589                         compat_alloc_user_space(sizeof(struct group_req));
 590                 u32 interface;
 591
 592                 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 593                     !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 594                     __get_user(interface, &gr32->gr_interface) ||
 595                     __put_user(interface, &kgr->gr_interface) ||
 596                     copy_in_user(&kgr->gr_group, &gr32->gr_group,
 597                                 sizeof(kgr->gr_group)))
 598                         return -EFAULT;
 599                 koptval = (char __user *)kgr;
 600                 koptlen = sizeof(struct group_req);
 601                 break;
 602         }
 603         case MCAST_JOIN_SOURCE_GROUP:
 604         case MCAST_LEAVE_SOURCE_GROUP:
 605         case MCAST_BLOCK_SOURCE:
 606         case MCAST_UNBLOCK_SOURCE:
 607         {
 608                 struct compat_group_source_req __user *gsr32 = (void *)optval;
 609                 struct group_source_req __user *kgsr = compat_alloc_user_space(
 610                         sizeof(struct group_source_req));
 611                 u32 interface;
 612
 613                 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 614                     !access_ok(VERIFY_WRITE, kgsr,
 615                         sizeof(struct group_source_req)) ||
 616                     __get_user(interface, &gsr32->gsr_interface) ||
 617                     __put_user(interface, &kgsr->gsr_interface) ||
 618                     copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 619                                 sizeof(kgsr->gsr_group)) ||
 620                     copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 621                                 sizeof(kgsr->gsr_source)))
 622                         return -EFAULT;
 623                 koptval = (char __user *)kgsr;
 624                 koptlen = sizeof(struct group_source_req);
 625                 break;
 626         }
 627         case MCAST_MSFILTER:
 628         {
 629                 struct compat_group_filter __user *gf32 = (void *)optval;
 630                 struct group_filter __user *kgf;
 631                 u32 interface, fmode, numsrc;
 632
 633                 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 634                     __get_user(interface, &gf32->gf_interface) ||
 635                     __get_user(fmode, &gf32->gf_fmode) ||
 636                     __get_user(numsrc, &gf32->gf_numsrc))
 637                         return -EFAULT;
 638                 koptlen = optlen + sizeof(struct group_filter) -
 639                                 sizeof(struct compat_group_filter);
 640                 if (koptlen < GROUP_FILTER_SIZE(numsrc))
 641                         return -EINVAL;
 642                 kgf = compat_alloc_user_space(koptlen);
 643                 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 644                     __put_user(interface, &kgf->gf_interface) ||
 645                     __put_user(fmode, &kgf->gf_fmode) ||
 646                     __put_user(numsrc, &kgf->gf_numsrc) ||
 647                     copy_in_user(&kgf->gf_group, &gf32->gf_group,
 648                                 sizeof(kgf->gf_group)) ||
 649                     (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 650                                 numsrc * sizeof(kgf->gf_slist[0]))))
 651                         return -EFAULT;
 652                 koptval = (char __user *)kgf;
 653                 break;
 654         }
 655
 656         default:
 657                 break;
 658         }
 659         return setsockopt(sock, level, optname, koptval, koptlen);
 660 }
 661 EXPORT_SYMBOL(compat_mc_setsockopt);
 662
 663 int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 664         char __user *optval, int __user *optlen,
 665         int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 666 {
 667         struct compat_group_filter __user *gf32 = (void *)optval;
 668         struct group_filter __user *kgf;
 669         int __user      *koptlen;
 670         u32 interface, fmode, numsrc;
 671         int klen, ulen, err;
 672
 673         if (optname != MCAST_MSFILTER)
 674                 return getsockopt(sock, level, optname, optval, optlen);
 675
 676         koptlen = compat_alloc_user_space(sizeof(*koptlen));
 677         if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 678             __get_user(ulen, optlen))
 679                 return -EFAULT;
 680
 681         /* adjust len for pad */
 682         klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 683
 684         if (klen < GROUP_FILTER_SIZE(0))
 685                 return -EINVAL;
 686
 687         if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 688             __put_user(klen, koptlen))
 689                 return -EFAULT;
 690
 691         /* have to allow space for previous compat_alloc_user_space, too */
 692         kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 693
 694         if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 695             __get_user(interface, &gf32->gf_interface) ||
 696             __get_user(fmode, &gf32->gf_fmode) ||
 697             __get_user(numsrc, &gf32->gf_numsrc) ||
 698             __put_user(interface, &kgf->gf_interface) ||
 699             __put_user(fmode, &kgf->gf_fmode) ||
 700             __put_user(numsrc, &kgf->gf_numsrc) ||
 701             copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 702                 return -EFAULT;
 703
 704         err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 705         if (err)
 706                 return err;
 707
 708         if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 709             __get_user(klen, koptlen))
 710                 return -EFAULT;
 711
 712         ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 713
 714         if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 715             __put_user(ulen, optlen))
 716                 return -EFAULT;
 717
 718         if (!access_ok(VERIFY_READ, kgf, klen) ||
 719             !access_ok(VERIFY_WRITE, gf32, ulen) ||
 720             __get_user(interface, &kgf->gf_interface) ||
 721             __get_user(fmode, &kgf->gf_fmode) ||
 722             __get_user(numsrc, &kgf->gf_numsrc) ||
 723             __put_user(interface, &gf32->gf_interface) ||
 724             __put_user(fmode, &gf32->gf_fmode) ||
 725             __put_user(numsrc, &gf32->gf_numsrc))
 726                 return -EFAULT;
 727         if (numsrc) {
 728                 int copylen;
 729
 730                 klen -= GROUP_FILTER_SIZE(0);
 731                 copylen = numsrc * sizeof(gf32->gf_slist[0]);
 732                 if (copylen > klen)
 733                         copylen = klen;
 734                 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 735                         return -EFAULT;
 736         }
 737         return err;
 738 }
 739 EXPORT_SYMBOL(compat_mc_getsockopt);
 740
 741
 742 /* Argument list sizes for compat_sys_socketcall */
 743 #define AL(x) ((x) * sizeof(u32))
 744 static unsigned char nas[21] = {
 745         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 746         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 747         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 748         AL(4), AL(5), AL(4)
 749 };
 750 #undef AL
 751
 752 static inline long __compat_sys_sendmsg(int fd,
 753                                         struct compat_msghdr __user *msg,
 754                                         unsigned int flags)
 755 {
 756         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
 757                              flags | MSG_CMSG_COMPAT, false);
 758 }
 759
 760 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
 761                        unsigned int, flags)
 762 {
 763         return __compat_sys_sendmsg(fd, msg, flags);
 764 }
 765
 766 static inline long __compat_sys_sendmmsg(int fd,
 767                                          struct compat_mmsghdr __user *mmsg,
 768                                          unsigned int vlen, unsigned int flags)
 769 {
 770         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 771                               flags | MSG_CMSG_COMPAT, false);
 772 }
 773
 774 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 775                        unsigned int, vlen, unsigned int, flags)
 776 {
 777         return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
 778 }
 779
 780 static inline long __compat_sys_recvmsg(int fd,
 781                                         struct compat_msghdr __user *msg,
 782                                         unsigned int flags)
 783 {
 784         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
 785                              flags | MSG_CMSG_COMPAT, false);
 786 }
 787
 788 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
 789                        unsigned int, flags)
 790 {
 791         return __compat_sys_recvmsg(fd, msg, flags);
 792 }
 793
 794 static inline long __compat_sys_recvfrom(int fd, void __user *buf,
 795                                          compat_size_t len, unsigned int flags,
 796                                          struct sockaddr __user *addr,
 797                                          int __user *addrlen)
 798 {
 799         return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
 800                               addrlen);
 801 }
 802
 803 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 804 {
 805         return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
 806 }
 807
 808 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 809                        unsigned int, flags, struct sockaddr __user *, addr,
 810                        int __user *, addrlen)
 811 {
 812         return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
 813 }
 814
 815 static int __compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
 816                                  unsigned int vlen, unsigned int flags,
 817                                  struct compat_timespec __user *timeout)
 818 {
 819         int datagrams;
 820         struct timespec ktspec;
 821
 822         if (timeout == NULL)
 823                 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 824                                       flags | MSG_CMSG_COMPAT, NULL);
 825
 826         if (compat_get_timespec(&ktspec, timeout))
 827                 return -EFAULT;
 828
 829         datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 830                                    flags | MSG_CMSG_COMPAT, &ktspec);
 831         if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 832                 datagrams = -EFAULT;
 833
 834         return datagrams;
 835 }
 836
 837 COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 838                        unsigned int, vlen, unsigned int, flags,
 839                        struct compat_timespec __user *, timeout)
 840 {
 841         return __compat_sys_recvmmsg(fd, mmsg, vlen, flags, timeout);
 842 }
 843
 844 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 845 {
 846         u32 a[AUDITSC_ARGS];
 847         unsigned int len;
 848         u32 a0, a1;
 849         int ret;
 850
 851         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 852                 return -EINVAL;
 853         len = nas[call];
 854         if (len > sizeof(a))
 855                 return -EINVAL;
 856
 857         if (copy_from_user(a, args, len))
 858                 return -EFAULT;
 859
 860         ret = audit_socketcall_compat(len / sizeof(a[0]), a);
 861         if (ret)
 862                 return ret;
 863
 864         a0 = a[0];
 865         a1 = a[1];
 866
 867         switch (call) {
 868         case SYS_SOCKET:
 869                 ret = __sys_socket(a0, a1, a[2]);
 870                 break;
 871         case SYS_BIND:
 872                 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
 873                 break;
 874         case SYS_CONNECT:
 875                 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
 876                 break;
 877         case SYS_LISTEN:
 878                 ret = __sys_listen(a0, a1);
 879                 break;
 880         case SYS_ACCEPT:
 881                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 882                 break;
 883         case SYS_GETSOCKNAME:
 884                 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 885                 break;
 886         case SYS_GETPEERNAME:
 887                 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 888                 break;
 889         case SYS_SOCKETPAIR:
 890                 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 891                 break;
 892         case SYS_SEND:
 893                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
 894                 break;
 895         case SYS_SENDTO:
 896                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
 897                                    compat_ptr(a[4]), a[5]);
 898                 break;
 899         case SYS_RECV:
 900                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 901                                             NULL, NULL);
 902                 break;
 903         case SYS_RECVFROM:
 904                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 905                                             compat_ptr(a[4]),
 906                                             compat_ptr(a[5]));
 907                 break;
 908         case SYS_SHUTDOWN:
 909                 ret = __sys_shutdown(a0, a1);
 910                 break;
 911         case SYS_SETSOCKOPT:
 912                 ret = __compat_sys_setsockopt(a0, a1, a[2],
 913                                               compat_ptr(a[3]), a[4]);
 914                 break;
 915         case SYS_GETSOCKOPT:
 916                 ret = __compat_sys_getsockopt(a0, a1, a[2],
 917                                               compat_ptr(a[3]),
 918                                               compat_ptr(a[4]));
 919                 break;
 920         case SYS_SENDMSG:
 921                 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 922                 break;
 923         case SYS_SENDMMSG:
 924                 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 925                 break;
 926         case SYS_RECVMSG:
 927                 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 928                 break;
 929         case SYS_RECVMMSG:
 930                 ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 931                                             compat_ptr(a[4]));
 932                 break;
 933         case SYS_ACCEPT4:
 934                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 935                 break;
 936         default:
 937                 ret = -EINVAL;
 938                 break;
 939         }
 940         return ret;
 941 }