linux/net/compat.c
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   1/*
   2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3 *
   4 * Copyright (C) 2000           VA Linux Co
   5 * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6 * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7 * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8 * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9 * Copyright (C) 2000           Hewlett-Packard Co.
  10 * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11 * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/gfp.h>
  16#include <linux/fs.h>
  17#include <linux/types.h>
  18#include <linux/file.h>
  19#include <linux/icmpv6.h>
  20#include <linux/socket.h>
  21#include <linux/syscalls.h>
  22#include <linux/filter.h>
  23#include <linux/compat.h>
  24#include <linux/security.h>
  25#include <linux/export.h>
  26
  27#include <net/scm.h>
  28#include <net/sock.h>
  29#include <net/ip.h>
  30#include <net/ipv6.h>
  31#include <asm/uaccess.h>
  32#include <net/compat.h>
  33
  34int get_compat_msghdr(struct msghdr *kmsg,
  35                      struct compat_msghdr __user *umsg,
  36                      struct sockaddr __user **save_addr,
  37                      struct iovec **iov)
  38{
  39        compat_uptr_t uaddr, uiov, tmp3;
  40        compat_size_t nr_segs;
  41        ssize_t err;
  42
  43        if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  44            __get_user(uaddr, &umsg->msg_name) ||
  45            __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  46            __get_user(uiov, &umsg->msg_iov) ||
  47            __get_user(nr_segs, &umsg->msg_iovlen) ||
  48            __get_user(tmp3, &umsg->msg_control) ||
  49            __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  50            __get_user(kmsg->msg_flags, &umsg->msg_flags))
  51                return -EFAULT;
  52
  53        if (!uaddr)
  54                kmsg->msg_namelen = 0;
  55
  56        if (kmsg->msg_namelen < 0)
  57                return -EINVAL;
  58
  59        if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  60                kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  61        kmsg->msg_control = compat_ptr(tmp3);
  62
  63        if (save_addr)
  64                *save_addr = compat_ptr(uaddr);
  65
  66        if (uaddr && kmsg->msg_namelen) {
  67                if (!save_addr) {
  68                        err = move_addr_to_kernel(compat_ptr(uaddr),
  69                                                  kmsg->msg_namelen,
  70                                                  kmsg->msg_name);
  71                        if (err < 0)
  72                                return err;
  73                }
  74        } else {
  75                kmsg->msg_name = NULL;
  76                kmsg->msg_namelen = 0;
  77        }
  78
  79        if (nr_segs > UIO_MAXIOV)
  80                return -EMSGSIZE;
  81
  82        kmsg->msg_iocb = NULL;
  83
  84        return compat_import_iovec(save_addr ? READ : WRITE,
  85                                   compat_ptr(uiov), nr_segs,
  86                                   UIO_FASTIOV, iov, &kmsg->msg_iter);
  87}
  88
  89/* Bleech... */
  90#define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
  91
  92#define CMSG_COMPAT_DATA(cmsg)                          \
  93        ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
  94#define CMSG_COMPAT_SPACE(len)                          \
  95        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
  96#define CMSG_COMPAT_LEN(len)                            \
  97        (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
  98
  99#define CMSG_COMPAT_FIRSTHDR(msg)                       \
 100        (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 101         (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 102         (struct compat_cmsghdr __user *)NULL)
 103
 104#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 105        ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 106         (ucmlen) <= (unsigned long) \
 107         ((mhdr)->msg_controllen - \
 108          ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 109
 110static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 111                struct compat_cmsghdr __user *cmsg, int cmsg_len)
 112{
 113        char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 114        if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 115                        msg->msg_controllen)
 116                return NULL;
 117        return (struct compat_cmsghdr __user *)ptr;
 118}
 119
 120/* There is a lot of hair here because the alignment rules (and
 121 * thus placement) of cmsg headers and length are different for
 122 * 32-bit apps.  -DaveM
 123 */
 124int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 125                               unsigned char *stackbuf, int stackbuf_size)
 126{
 127        struct compat_cmsghdr __user *ucmsg;
 128        struct cmsghdr *kcmsg, *kcmsg_base;
 129        compat_size_t ucmlen;
 130        __kernel_size_t kcmlen, tmp;
 131        int err = -EFAULT;
 132
 133        kcmlen = 0;
 134        kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 135        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 136        while (ucmsg != NULL) {
 137                if (get_user(ucmlen, &ucmsg->cmsg_len))
 138                        return -EFAULT;
 139
 140                /* Catch bogons. */
 141                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 142                        return -EINVAL;
 143
 144                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 145                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 146                tmp = CMSG_ALIGN(tmp);
 147                kcmlen += tmp;
 148                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 149        }
 150        if (kcmlen == 0)
 151                return -EINVAL;
 152
 153        /* The kcmlen holds the 64-bit version of the control length.
 154         * It may not be modified as we do not stick it into the kmsg
 155         * until we have successfully copied over all of the data
 156         * from the user.
 157         */
 158        if (kcmlen > stackbuf_size)
 159                kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 160        if (kcmsg == NULL)
 161                return -ENOBUFS;
 162
 163        /* Now copy them over neatly. */
 164        memset(kcmsg, 0, kcmlen);
 165        ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 166        while (ucmsg != NULL) {
 167                if (__get_user(ucmlen, &ucmsg->cmsg_len))
 168                        goto Efault;
 169                if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 170                        goto Einval;
 171                tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 172                       CMSG_ALIGN(sizeof(struct cmsghdr)));
 173                if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 174                        goto Einval;
 175                kcmsg->cmsg_len = tmp;
 176                tmp = CMSG_ALIGN(tmp);
 177                if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 178                    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 179                    copy_from_user(CMSG_DATA(kcmsg),
 180                                   CMSG_COMPAT_DATA(ucmsg),
 181                                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 182                        goto Efault;
 183
 184                /* Advance. */
 185                kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 186                ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 187        }
 188
 189        /* Ok, looks like we made it.  Hook it up and return success. */
 190        kmsg->msg_control = kcmsg_base;
 191        kmsg->msg_controllen = kcmlen;
 192        return 0;
 193
 194Einval:
 195        err = -EINVAL;
 196Efault:
 197        if (kcmsg_base != (struct cmsghdr *)stackbuf)
 198                sock_kfree_s(sk, kcmsg_base, kcmlen);
 199        return err;
 200}
 201
 202int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 203{
 204        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 205        struct compat_cmsghdr cmhdr;
 206        struct compat_timeval ctv;
 207        struct compat_timespec cts[3];
 208        int cmlen;
 209
 210        if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 211                kmsg->msg_flags |= MSG_CTRUNC;
 212                return 0; /* XXX: return error? check spec. */
 213        }
 214
 215        if (!COMPAT_USE_64BIT_TIME) {
 216                if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
 217                        struct timeval *tv = (struct timeval *)data;
 218                        ctv.tv_sec = tv->tv_sec;
 219                        ctv.tv_usec = tv->tv_usec;
 220                        data = &ctv;
 221                        len = sizeof(ctv);
 222                }
 223                if (level == SOL_SOCKET &&
 224                    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
 225                        int count = type == SCM_TIMESTAMPNS ? 1 : 3;
 226                        int i;
 227                        struct timespec *ts = (struct timespec *)data;
 228                        for (i = 0; i < count; i++) {
 229                                cts[i].tv_sec = ts[i].tv_sec;
 230                                cts[i].tv_nsec = ts[i].tv_nsec;
 231                        }
 232                        data = &cts;
 233                        len = sizeof(cts[0]) * count;
 234                }
 235        }
 236
 237        cmlen = CMSG_COMPAT_LEN(len);
 238        if (kmsg->msg_controllen < cmlen) {
 239                kmsg->msg_flags |= MSG_CTRUNC;
 240                cmlen = kmsg->msg_controllen;
 241        }
 242        cmhdr.cmsg_level = level;
 243        cmhdr.cmsg_type = type;
 244        cmhdr.cmsg_len = cmlen;
 245
 246        if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 247                return -EFAULT;
 248        if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 249                return -EFAULT;
 250        cmlen = CMSG_COMPAT_SPACE(len);
 251        if (kmsg->msg_controllen < cmlen)
 252                cmlen = kmsg->msg_controllen;
 253        kmsg->msg_control += cmlen;
 254        kmsg->msg_controllen -= cmlen;
 255        return 0;
 256}
 257
 258void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 259{
 260        struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 261        int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 262        int fdnum = scm->fp->count;
 263        struct file **fp = scm->fp->fp;
 264        int __user *cmfptr;
 265        int err = 0, i;
 266
 267        if (fdnum < fdmax)
 268                fdmax = fdnum;
 269
 270        for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 271                int new_fd;
 272                err = security_file_receive(fp[i]);
 273                if (err)
 274                        break;
 275                err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
 276                                          ? O_CLOEXEC : 0);
 277                if (err < 0)
 278                        break;
 279                new_fd = err;
 280                err = put_user(new_fd, cmfptr);
 281                if (err) {
 282                        put_unused_fd(new_fd);
 283                        break;
 284                }
 285                /* Bump the usage count and install the file. */
 286                fd_install(new_fd, get_file(fp[i]));
 287        }
 288
 289        if (i > 0) {
 290                int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 291                err = put_user(SOL_SOCKET, &cm->cmsg_level);
 292                if (!err)
 293                        err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 294                if (!err)
 295                        err = put_user(cmlen, &cm->cmsg_len);
 296                if (!err) {
 297                        cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 298                        kmsg->msg_control += cmlen;
 299                        kmsg->msg_controllen -= cmlen;
 300                }
 301        }
 302        if (i < fdnum)
 303                kmsg->msg_flags |= MSG_CTRUNC;
 304
 305        /*
 306         * All of the files that fit in the message have had their
 307         * usage counts incremented, so we just free the list.
 308         */
 309        __scm_destroy(scm);
 310}
 311
 312static int do_set_attach_filter(struct socket *sock, int level, int optname,
 313                                char __user *optval, unsigned int optlen)
 314{
 315        struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 316        struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 317        compat_uptr_t ptr;
 318        u16 len;
 319
 320        if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 321            !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 322            __get_user(len, &fprog32->len) ||
 323            __get_user(ptr, &fprog32->filter) ||
 324            __put_user(len, &kfprog->len) ||
 325            __put_user(compat_ptr(ptr), &kfprog->filter))
 326                return -EFAULT;
 327
 328        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 329                              sizeof(struct sock_fprog));
 330}
 331
 332static int do_set_sock_timeout(struct socket *sock, int level,
 333                int optname, char __user *optval, unsigned int optlen)
 334{
 335        struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 336        struct timeval ktime;
 337        mm_segment_t old_fs;
 338        int err;
 339
 340        if (optlen < sizeof(*up))
 341                return -EINVAL;
 342        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 343            __get_user(ktime.tv_sec, &up->tv_sec) ||
 344            __get_user(ktime.tv_usec, &up->tv_usec))
 345                return -EFAULT;
 346        old_fs = get_fs();
 347        set_fs(KERNEL_DS);
 348        err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 349        set_fs(old_fs);
 350
 351        return err;
 352}
 353
 354static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 355                                char __user *optval, unsigned int optlen)
 356{
 357        if (optname == SO_ATTACH_FILTER)
 358                return do_set_attach_filter(sock, level, optname,
 359                                            optval, optlen);
 360        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 361                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 362
 363        return sock_setsockopt(sock, level, optname, optval, optlen);
 364}
 365
 366COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 367                       char __user *, optval, unsigned int, optlen)
 368{
 369        int err;
 370        struct socket *sock = sockfd_lookup(fd, &err);
 371
 372        if (sock) {
 373                err = security_socket_setsockopt(sock, level, optname);
 374                if (err) {
 375                        sockfd_put(sock);
 376                        return err;
 377                }
 378
 379                if (level == SOL_SOCKET)
 380                        err = compat_sock_setsockopt(sock, level,
 381                                        optname, optval, optlen);
 382                else if (sock->ops->compat_setsockopt)
 383                        err = sock->ops->compat_setsockopt(sock, level,
 384                                        optname, optval, optlen);
 385                else
 386                        err = sock->ops->setsockopt(sock, level,
 387                                        optname, optval, optlen);
 388                sockfd_put(sock);
 389        }
 390        return err;
 391}
 392
 393static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 394                char __user *optval, int __user *optlen)
 395{
 396        struct compat_timeval __user *up;
 397        struct timeval ktime;
 398        mm_segment_t old_fs;
 399        int len, err;
 400
 401        up = (struct compat_timeval __user *) optval;
 402        if (get_user(len, optlen))
 403                return -EFAULT;
 404        if (len < sizeof(*up))
 405                return -EINVAL;
 406        len = sizeof(ktime);
 407        old_fs = get_fs();
 408        set_fs(KERNEL_DS);
 409        err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 410        set_fs(old_fs);
 411
 412        if (!err) {
 413                if (put_user(sizeof(*up), optlen) ||
 414                    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 415                    __put_user(ktime.tv_sec, &up->tv_sec) ||
 416                    __put_user(ktime.tv_usec, &up->tv_usec))
 417                        err = -EFAULT;
 418        }
 419        return err;
 420}
 421
 422static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 423                                char __user *optval, int __user *optlen)
 424{
 425        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 426                return do_get_sock_timeout(sock, level, optname, optval, optlen);
 427        return sock_getsockopt(sock, level, optname, optval, optlen);
 428}
 429
 430int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 431{
 432        struct compat_timeval __user *ctv;
 433        int err;
 434        struct timeval tv;
 435
 436        if (COMPAT_USE_64BIT_TIME)
 437                return sock_get_timestamp(sk, userstamp);
 438
 439        ctv = (struct compat_timeval __user *) userstamp;
 440        err = -ENOENT;
 441        if (!sock_flag(sk, SOCK_TIMESTAMP))
 442                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 443        tv = ktime_to_timeval(sk->sk_stamp);
 444        if (tv.tv_sec == -1)
 445                return err;
 446        if (tv.tv_sec == 0) {
 447                sk->sk_stamp = ktime_get_real();
 448                tv = ktime_to_timeval(sk->sk_stamp);
 449        }
 450        err = 0;
 451        if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 452                        put_user(tv.tv_usec, &ctv->tv_usec))
 453                err = -EFAULT;
 454        return err;
 455}
 456EXPORT_SYMBOL(compat_sock_get_timestamp);
 457
 458int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 459{
 460        struct compat_timespec __user *ctv;
 461        int err;
 462        struct timespec ts;
 463
 464        if (COMPAT_USE_64BIT_TIME)
 465                return sock_get_timestampns (sk, userstamp);
 466
 467        ctv = (struct compat_timespec __user *) userstamp;
 468        err = -ENOENT;
 469        if (!sock_flag(sk, SOCK_TIMESTAMP))
 470                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 471        ts = ktime_to_timespec(sk->sk_stamp);
 472        if (ts.tv_sec == -1)
 473                return err;
 474        if (ts.tv_sec == 0) {
 475                sk->sk_stamp = ktime_get_real();
 476                ts = ktime_to_timespec(sk->sk_stamp);
 477        }
 478        err = 0;
 479        if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 480                        put_user(ts.tv_nsec, &ctv->tv_nsec))
 481                err = -EFAULT;
 482        return err;
 483}
 484EXPORT_SYMBOL(compat_sock_get_timestampns);
 485
 486COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 487                       char __user *, optval, int __user *, optlen)
 488{
 489        int err;
 490        struct socket *sock = sockfd_lookup(fd, &err);
 491
 492        if (sock) {
 493                err = security_socket_getsockopt(sock, level, optname);
 494                if (err) {
 495                        sockfd_put(sock);
 496                        return err;
 497                }
 498
 499                if (level == SOL_SOCKET)
 500                        err = compat_sock_getsockopt(sock, level,
 501                                        optname, optval, optlen);
 502                else if (sock->ops->compat_getsockopt)
 503                        err = sock->ops->compat_getsockopt(sock, level,
 504                                        optname, optval, optlen);
 505                else
 506                        err = sock->ops->getsockopt(sock, level,
 507                                        optname, optval, optlen);
 508                sockfd_put(sock);
 509        }
 510        return err;
 511}
 512
 513struct compat_group_req {
 514        __u32                            gr_interface;
 515        struct __kernel_sockaddr_storage gr_group
 516                __aligned(4);
 517} __packed;
 518
 519struct compat_group_source_req {
 520        __u32                            gsr_interface;
 521        struct __kernel_sockaddr_storage gsr_group
 522                __aligned(4);
 523        struct __kernel_sockaddr_storage gsr_source
 524                __aligned(4);
 525} __packed;
 526
 527struct compat_group_filter {
 528        __u32                            gf_interface;
 529        struct __kernel_sockaddr_storage gf_group
 530                __aligned(4);
 531        __u32                            gf_fmode;
 532        __u32                            gf_numsrc;
 533        struct __kernel_sockaddr_storage gf_slist[1]
 534                __aligned(4);
 535} __packed;
 536
 537#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 538                        sizeof(struct __kernel_sockaddr_storage))
 539
 540
 541int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 542        char __user *optval, unsigned int optlen,
 543        int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 544{
 545        char __user     *koptval = optval;
 546        int             koptlen = optlen;
 547
 548        switch (optname) {
 549        case MCAST_JOIN_GROUP:
 550        case MCAST_LEAVE_GROUP:
 551        {
 552                struct compat_group_req __user *gr32 = (void *)optval;
 553                struct group_req __user *kgr =
 554                        compat_alloc_user_space(sizeof(struct group_req));
 555                u32 interface;
 556
 557                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 558                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 559                    __get_user(interface, &gr32->gr_interface) ||
 560                    __put_user(interface, &kgr->gr_interface) ||
 561                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 562                                sizeof(kgr->gr_group)))
 563                        return -EFAULT;
 564                koptval = (char __user *)kgr;
 565                koptlen = sizeof(struct group_req);
 566                break;
 567        }
 568        case MCAST_JOIN_SOURCE_GROUP:
 569        case MCAST_LEAVE_SOURCE_GROUP:
 570        case MCAST_BLOCK_SOURCE:
 571        case MCAST_UNBLOCK_SOURCE:
 572        {
 573                struct compat_group_source_req __user *gsr32 = (void *)optval;
 574                struct group_source_req __user *kgsr = compat_alloc_user_space(
 575                        sizeof(struct group_source_req));
 576                u32 interface;
 577
 578                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 579                    !access_ok(VERIFY_WRITE, kgsr,
 580                        sizeof(struct group_source_req)) ||
 581                    __get_user(interface, &gsr32->gsr_interface) ||
 582                    __put_user(interface, &kgsr->gsr_interface) ||
 583                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 584                                sizeof(kgsr->gsr_group)) ||
 585                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 586                                sizeof(kgsr->gsr_source)))
 587                        return -EFAULT;
 588                koptval = (char __user *)kgsr;
 589                koptlen = sizeof(struct group_source_req);
 590                break;
 591        }
 592        case MCAST_MSFILTER:
 593        {
 594                struct compat_group_filter __user *gf32 = (void *)optval;
 595                struct group_filter __user *kgf;
 596                u32 interface, fmode, numsrc;
 597
 598                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 599                    __get_user(interface, &gf32->gf_interface) ||
 600                    __get_user(fmode, &gf32->gf_fmode) ||
 601                    __get_user(numsrc, &gf32->gf_numsrc))
 602                        return -EFAULT;
 603                koptlen = optlen + sizeof(struct group_filter) -
 604                                sizeof(struct compat_group_filter);
 605                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 606                        return -EINVAL;
 607                kgf = compat_alloc_user_space(koptlen);
 608                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 609                    __put_user(interface, &kgf->gf_interface) ||
 610                    __put_user(fmode, &kgf->gf_fmode) ||
 611                    __put_user(numsrc, &kgf->gf_numsrc) ||
 612                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 613                                sizeof(kgf->gf_group)) ||
 614                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 615                                numsrc * sizeof(kgf->gf_slist[0]))))
 616                        return -EFAULT;
 617                koptval = (char __user *)kgf;
 618                break;
 619        }
 620
 621        default:
 622                break;
 623        }
 624        return setsockopt(sock, level, optname, koptval, koptlen);
 625}
 626EXPORT_SYMBOL(compat_mc_setsockopt);
 627
 628int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 629        char __user *optval, int __user *optlen,
 630        int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 631{
 632        struct compat_group_filter __user *gf32 = (void *)optval;
 633        struct group_filter __user *kgf;
 634        int __user      *koptlen;
 635        u32 interface, fmode, numsrc;
 636        int klen, ulen, err;
 637
 638        if (optname != MCAST_MSFILTER)
 639                return getsockopt(sock, level, optname, optval, optlen);
 640
 641        koptlen = compat_alloc_user_space(sizeof(*koptlen));
 642        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 643            __get_user(ulen, optlen))
 644                return -EFAULT;
 645
 646        /* adjust len for pad */
 647        klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 648
 649        if (klen < GROUP_FILTER_SIZE(0))
 650                return -EINVAL;
 651
 652        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 653            __put_user(klen, koptlen))
 654                return -EFAULT;
 655
 656        /* have to allow space for previous compat_alloc_user_space, too */
 657        kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 658
 659        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 660            __get_user(interface, &gf32->gf_interface) ||
 661            __get_user(fmode, &gf32->gf_fmode) ||
 662            __get_user(numsrc, &gf32->gf_numsrc) ||
 663            __put_user(interface, &kgf->gf_interface) ||
 664            __put_user(fmode, &kgf->gf_fmode) ||
 665            __put_user(numsrc, &kgf->gf_numsrc) ||
 666            copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 667                return -EFAULT;
 668
 669        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 670        if (err)
 671                return err;
 672
 673        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 674            __get_user(klen, koptlen))
 675                return -EFAULT;
 676
 677        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 678
 679        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 680            __put_user(ulen, optlen))
 681                return -EFAULT;
 682
 683        if (!access_ok(VERIFY_READ, kgf, klen) ||
 684            !access_ok(VERIFY_WRITE, gf32, ulen) ||
 685            __get_user(interface, &kgf->gf_interface) ||
 686            __get_user(fmode, &kgf->gf_fmode) ||
 687            __get_user(numsrc, &kgf->gf_numsrc) ||
 688            __put_user(interface, &gf32->gf_interface) ||
 689            __put_user(fmode, &gf32->gf_fmode) ||
 690            __put_user(numsrc, &gf32->gf_numsrc))
 691                return -EFAULT;
 692        if (numsrc) {
 693                int copylen;
 694
 695                klen -= GROUP_FILTER_SIZE(0);
 696                copylen = numsrc * sizeof(gf32->gf_slist[0]);
 697                if (copylen > klen)
 698                        copylen = klen;
 699                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 700                        return -EFAULT;
 701        }
 702        return err;
 703}
 704EXPORT_SYMBOL(compat_mc_getsockopt);
 705
 706
 707/* Argument list sizes for compat_sys_socketcall */
 708#define AL(x) ((x) * sizeof(u32))
 709static unsigned char nas[21] = {
 710        AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 711        AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 712        AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 713        AL(4), AL(5), AL(4)
 714};
 715#undef AL
 716
 717COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 718{
 719        return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 720}
 721
 722COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 723                       unsigned int, vlen, unsigned int, flags)
 724{
 725        return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 726                              flags | MSG_CMSG_COMPAT);
 727}
 728
 729COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 730{
 731        return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 732}
 733
 734COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 735{
 736        return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 737}
 738
 739COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 740                       unsigned int, flags, struct sockaddr __user *, addr,
 741                       int __user *, addrlen)
 742{
 743        return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 744}
 745
 746COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 747                       unsigned int, vlen, unsigned int, flags,
 748                       struct compat_timespec __user *, timeout)
 749{
 750        int datagrams;
 751        struct timespec ktspec;
 752
 753        if (timeout == NULL)
 754                return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 755                                      flags | MSG_CMSG_COMPAT, NULL);
 756
 757        if (compat_get_timespec(&ktspec, timeout))
 758                return -EFAULT;
 759
 760        datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 761                                   flags | MSG_CMSG_COMPAT, &ktspec);
 762        if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 763                datagrams = -EFAULT;
 764
 765        return datagrams;
 766}
 767
 768COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 769{
 770        int ret;
 771        u32 a[6];
 772        u32 a0, a1;
 773
 774        if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 775                return -EINVAL;
 776        if (copy_from_user(a, args, nas[call]))
 777                return -EFAULT;
 778        a0 = a[0];
 779        a1 = a[1];
 780
 781        switch (call) {
 782        case SYS_SOCKET:
 783                ret = sys_socket(a0, a1, a[2]);
 784                break;
 785        case SYS_BIND:
 786                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 787                break;
 788        case SYS_CONNECT:
 789                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 790                break;
 791        case SYS_LISTEN:
 792                ret = sys_listen(a0, a1);
 793                break;
 794        case SYS_ACCEPT:
 795                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 796                break;
 797        case SYS_GETSOCKNAME:
 798                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 799                break;
 800        case SYS_GETPEERNAME:
 801                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 802                break;
 803        case SYS_SOCKETPAIR:
 804                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 805                break;
 806        case SYS_SEND:
 807                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 808                break;
 809        case SYS_SENDTO:
 810                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 811                break;
 812        case SYS_RECV:
 813                ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 814                break;
 815        case SYS_RECVFROM:
 816                ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 817                                          compat_ptr(a[4]), compat_ptr(a[5]));
 818                break;
 819        case SYS_SHUTDOWN:
 820                ret = sys_shutdown(a0, a1);
 821                break;
 822        case SYS_SETSOCKOPT:
 823                ret = compat_sys_setsockopt(a0, a1, a[2],
 824                                compat_ptr(a[3]), a[4]);
 825                break;
 826        case SYS_GETSOCKOPT:
 827                ret = compat_sys_getsockopt(a0, a1, a[2],
 828                                compat_ptr(a[3]), compat_ptr(a[4]));
 829                break;
 830        case SYS_SENDMSG:
 831                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 832                break;
 833        case SYS_SENDMMSG:
 834                ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 835                break;
 836        case SYS_RECVMSG:
 837                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 838                break;
 839        case SYS_RECVMMSG:
 840                ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 841                                          compat_ptr(a[4]));
 842                break;
 843        case SYS_ACCEPT4:
 844                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 845                break;
 846        default:
 847                ret = -EINVAL;
 848                break;
 849        }
 850        return ret;
 851}
 852
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