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
 312/* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 313struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 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 NULL;
 327
 328        return kfprog;
 329}
 330EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 331
 332static int do_set_attach_filter(struct socket *sock, int level, int optname,
 333                                char __user *optval, unsigned int optlen)
 334{
 335        struct sock_fprog __user *kfprog;
 336
 337        kfprog = get_compat_bpf_fprog(optval);
 338        if (!kfprog)
 339                return -EFAULT;
 340
 341        return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 342                              sizeof(struct sock_fprog));
 343}
 344
 345static int do_set_sock_timeout(struct socket *sock, int level,
 346                int optname, char __user *optval, unsigned int optlen)
 347{
 348        struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
 349        struct timeval ktime;
 350        mm_segment_t old_fs;
 351        int err;
 352
 353        if (optlen < sizeof(*up))
 354                return -EINVAL;
 355        if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 356            __get_user(ktime.tv_sec, &up->tv_sec) ||
 357            __get_user(ktime.tv_usec, &up->tv_usec))
 358                return -EFAULT;
 359        old_fs = get_fs();
 360        set_fs(KERNEL_DS);
 361        err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
 362        set_fs(old_fs);
 363
 364        return err;
 365}
 366
 367static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 368                                char __user *optval, unsigned int optlen)
 369{
 370        if (optname == SO_ATTACH_FILTER ||
 371            optname == SO_ATTACH_REUSEPORT_CBPF)
 372                return do_set_attach_filter(sock, level, optname,
 373                                            optval, optlen);
 374        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 375                return do_set_sock_timeout(sock, level, optname, optval, optlen);
 376
 377        return sock_setsockopt(sock, level, optname, optval, optlen);
 378}
 379
 380COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 381                       char __user *, optval, unsigned int, optlen)
 382{
 383        int err;
 384        struct socket *sock = sockfd_lookup(fd, &err);
 385
 386        if (sock) {
 387                err = security_socket_setsockopt(sock, level, optname);
 388                if (err) {
 389                        sockfd_put(sock);
 390                        return err;
 391                }
 392
 393                if (level == SOL_SOCKET)
 394                        err = compat_sock_setsockopt(sock, level,
 395                                        optname, optval, optlen);
 396                else if (sock->ops->compat_setsockopt)
 397                        err = sock->ops->compat_setsockopt(sock, level,
 398                                        optname, optval, optlen);
 399                else
 400                        err = sock->ops->setsockopt(sock, level,
 401                                        optname, optval, optlen);
 402                sockfd_put(sock);
 403        }
 404        return err;
 405}
 406
 407static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 408                char __user *optval, int __user *optlen)
 409{
 410        struct compat_timeval __user *up;
 411        struct timeval ktime;
 412        mm_segment_t old_fs;
 413        int len, err;
 414
 415        up = (struct compat_timeval __user *) optval;
 416        if (get_user(len, optlen))
 417                return -EFAULT;
 418        if (len < sizeof(*up))
 419                return -EINVAL;
 420        len = sizeof(ktime);
 421        old_fs = get_fs();
 422        set_fs(KERNEL_DS);
 423        err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 424        set_fs(old_fs);
 425
 426        if (!err) {
 427                if (put_user(sizeof(*up), optlen) ||
 428                    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 429                    __put_user(ktime.tv_sec, &up->tv_sec) ||
 430                    __put_user(ktime.tv_usec, &up->tv_usec))
 431                        err = -EFAULT;
 432        }
 433        return err;
 434}
 435
 436static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 437                                char __user *optval, int __user *optlen)
 438{
 439        if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 440                return do_get_sock_timeout(sock, level, optname, optval, optlen);
 441        return sock_getsockopt(sock, level, optname, optval, optlen);
 442}
 443
 444int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 445{
 446        struct compat_timeval __user *ctv;
 447        int err;
 448        struct timeval tv;
 449
 450        if (COMPAT_USE_64BIT_TIME)
 451                return sock_get_timestamp(sk, userstamp);
 452
 453        ctv = (struct compat_timeval __user *) userstamp;
 454        err = -ENOENT;
 455        if (!sock_flag(sk, SOCK_TIMESTAMP))
 456                sock_enable_timestamp(sk, SOCK_TIMESTAMP);
 457        tv = ktime_to_timeval(sk->sk_stamp);
 458        if (tv.tv_sec == -1)
 459                return err;
 460        if (tv.tv_sec == 0) {
 461                sk->sk_stamp = ktime_get_real();
 462                tv = ktime_to_timeval(sk->sk_stamp);
 463        }
 464        err = 0;
 465        if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 466                        put_user(tv.tv_usec, &ctv->tv_usec))
 467                err = -EFAULT;
 468        return err;
 469}
 470EXPORT_SYMBOL(compat_sock_get_timestamp);
 471
 472int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 473{
 474        struct compat_timespec __user *ctv;
 475        int err;
 476        struct timespec ts;
 477
 478        if (COMPAT_USE_64BIT_TIME)
 479                return sock_get_timestampns (sk, userstamp);
 480
 481        ctv = (struct compat_timespec __user *) userstamp;
 482        err = -ENOENT;
 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}
 498EXPORT_SYMBOL(compat_sock_get_timestampns);
 499
 500COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 501                       char __user *, optval, int __user *, optlen)
 502{
 503        int err;
 504        struct socket *sock = sockfd_lookup(fd, &err);
 505
 506        if (sock) {
 507                err = security_socket_getsockopt(sock, level, optname);
 508                if (err) {
 509                        sockfd_put(sock);
 510                        return err;
 511                }
 512
 513                if (level == SOL_SOCKET)
 514                        err = compat_sock_getsockopt(sock, level,
 515                                        optname, optval, optlen);
 516                else if (sock->ops->compat_getsockopt)
 517                        err = sock->ops->compat_getsockopt(sock, level,
 518                                        optname, optval, optlen);
 519                else
 520                        err = sock->ops->getsockopt(sock, level,
 521                                        optname, optval, optlen);
 522                sockfd_put(sock);
 523        }
 524        return err;
 525}
 526
 527struct compat_group_req {
 528        __u32                            gr_interface;
 529        struct __kernel_sockaddr_storage gr_group
 530                __aligned(4);
 531} __packed;
 532
 533struct compat_group_source_req {
 534        __u32                            gsr_interface;
 535        struct __kernel_sockaddr_storage gsr_group
 536                __aligned(4);
 537        struct __kernel_sockaddr_storage gsr_source
 538                __aligned(4);
 539} __packed;
 540
 541struct compat_group_filter {
 542        __u32                            gf_interface;
 543        struct __kernel_sockaddr_storage gf_group
 544                __aligned(4);
 545        __u32                            gf_fmode;
 546        __u32                            gf_numsrc;
 547        struct __kernel_sockaddr_storage gf_slist[1]
 548                __aligned(4);
 549} __packed;
 550
 551#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
 552                        sizeof(struct __kernel_sockaddr_storage))
 553
 554
 555int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 556        char __user *optval, unsigned int optlen,
 557        int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
 558{
 559        char __user     *koptval = optval;
 560        int             koptlen = optlen;
 561
 562        switch (optname) {
 563        case MCAST_JOIN_GROUP:
 564        case MCAST_LEAVE_GROUP:
 565        {
 566                struct compat_group_req __user *gr32 = (void *)optval;
 567                struct group_req __user *kgr =
 568                        compat_alloc_user_space(sizeof(struct group_req));
 569                u32 interface;
 570
 571                if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
 572                    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
 573                    __get_user(interface, &gr32->gr_interface) ||
 574                    __put_user(interface, &kgr->gr_interface) ||
 575                    copy_in_user(&kgr->gr_group, &gr32->gr_group,
 576                                sizeof(kgr->gr_group)))
 577                        return -EFAULT;
 578                koptval = (char __user *)kgr;
 579                koptlen = sizeof(struct group_req);
 580                break;
 581        }
 582        case MCAST_JOIN_SOURCE_GROUP:
 583        case MCAST_LEAVE_SOURCE_GROUP:
 584        case MCAST_BLOCK_SOURCE:
 585        case MCAST_UNBLOCK_SOURCE:
 586        {
 587                struct compat_group_source_req __user *gsr32 = (void *)optval;
 588                struct group_source_req __user *kgsr = compat_alloc_user_space(
 589                        sizeof(struct group_source_req));
 590                u32 interface;
 591
 592                if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
 593                    !access_ok(VERIFY_WRITE, kgsr,
 594                        sizeof(struct group_source_req)) ||
 595                    __get_user(interface, &gsr32->gsr_interface) ||
 596                    __put_user(interface, &kgsr->gsr_interface) ||
 597                    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
 598                                sizeof(kgsr->gsr_group)) ||
 599                    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
 600                                sizeof(kgsr->gsr_source)))
 601                        return -EFAULT;
 602                koptval = (char __user *)kgsr;
 603                koptlen = sizeof(struct group_source_req);
 604                break;
 605        }
 606        case MCAST_MSFILTER:
 607        {
 608                struct compat_group_filter __user *gf32 = (void *)optval;
 609                struct group_filter __user *kgf;
 610                u32 interface, fmode, numsrc;
 611
 612                if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 613                    __get_user(interface, &gf32->gf_interface) ||
 614                    __get_user(fmode, &gf32->gf_fmode) ||
 615                    __get_user(numsrc, &gf32->gf_numsrc))
 616                        return -EFAULT;
 617                koptlen = optlen + sizeof(struct group_filter) -
 618                                sizeof(struct compat_group_filter);
 619                if (koptlen < GROUP_FILTER_SIZE(numsrc))
 620                        return -EINVAL;
 621                kgf = compat_alloc_user_space(koptlen);
 622                if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
 623                    __put_user(interface, &kgf->gf_interface) ||
 624                    __put_user(fmode, &kgf->gf_fmode) ||
 625                    __put_user(numsrc, &kgf->gf_numsrc) ||
 626                    copy_in_user(&kgf->gf_group, &gf32->gf_group,
 627                                sizeof(kgf->gf_group)) ||
 628                    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
 629                                numsrc * sizeof(kgf->gf_slist[0]))))
 630                        return -EFAULT;
 631                koptval = (char __user *)kgf;
 632                break;
 633        }
 634
 635        default:
 636                break;
 637        }
 638        return setsockopt(sock, level, optname, koptval, koptlen);
 639}
 640EXPORT_SYMBOL(compat_mc_setsockopt);
 641
 642int compat_mc_getsockopt(struct sock *sock, int level, int optname,
 643        char __user *optval, int __user *optlen,
 644        int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
 645{
 646        struct compat_group_filter __user *gf32 = (void *)optval;
 647        struct group_filter __user *kgf;
 648        int __user      *koptlen;
 649        u32 interface, fmode, numsrc;
 650        int klen, ulen, err;
 651
 652        if (optname != MCAST_MSFILTER)
 653                return getsockopt(sock, level, optname, optval, optlen);
 654
 655        koptlen = compat_alloc_user_space(sizeof(*koptlen));
 656        if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
 657            __get_user(ulen, optlen))
 658                return -EFAULT;
 659
 660        /* adjust len for pad */
 661        klen = ulen + sizeof(*kgf) - sizeof(*gf32);
 662
 663        if (klen < GROUP_FILTER_SIZE(0))
 664                return -EINVAL;
 665
 666        if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
 667            __put_user(klen, koptlen))
 668                return -EFAULT;
 669
 670        /* have to allow space for previous compat_alloc_user_space, too */
 671        kgf = compat_alloc_user_space(klen+sizeof(*optlen));
 672
 673        if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
 674            __get_user(interface, &gf32->gf_interface) ||
 675            __get_user(fmode, &gf32->gf_fmode) ||
 676            __get_user(numsrc, &gf32->gf_numsrc) ||
 677            __put_user(interface, &kgf->gf_interface) ||
 678            __put_user(fmode, &kgf->gf_fmode) ||
 679            __put_user(numsrc, &kgf->gf_numsrc) ||
 680            copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
 681                return -EFAULT;
 682
 683        err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
 684        if (err)
 685                return err;
 686
 687        if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
 688            __get_user(klen, koptlen))
 689                return -EFAULT;
 690
 691        ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
 692
 693        if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
 694            __put_user(ulen, optlen))
 695                return -EFAULT;
 696
 697        if (!access_ok(VERIFY_READ, kgf, klen) ||
 698            !access_ok(VERIFY_WRITE, gf32, ulen) ||
 699            __get_user(interface, &kgf->gf_interface) ||
 700            __get_user(fmode, &kgf->gf_fmode) ||
 701            __get_user(numsrc, &kgf->gf_numsrc) ||
 702            __put_user(interface, &gf32->gf_interface) ||
 703            __put_user(fmode, &gf32->gf_fmode) ||
 704            __put_user(numsrc, &gf32->gf_numsrc))
 705                return -EFAULT;
 706        if (numsrc) {
 707                int copylen;
 708
 709                klen -= GROUP_FILTER_SIZE(0);
 710                copylen = numsrc * sizeof(gf32->gf_slist[0]);
 711                if (copylen > klen)
 712                        copylen = klen;
 713                if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
 714                        return -EFAULT;
 715        }
 716        return err;
 717}
 718EXPORT_SYMBOL(compat_mc_getsockopt);
 719
 720
 721/* Argument list sizes for compat_sys_socketcall */
 722#define AL(x) ((x) * sizeof(u32))
 723static unsigned char nas[21] = {
 724        AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 725        AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 726        AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 727        AL(4), AL(5), AL(4)
 728};
 729#undef AL
 730
 731COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 732{
 733        return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 734}
 735
 736COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 737                       unsigned int, vlen, unsigned int, flags)
 738{
 739        return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 740                              flags | MSG_CMSG_COMPAT);
 741}
 742
 743COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
 744{
 745        return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 746}
 747
 748COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 749{
 750        return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
 751}
 752
 753COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 754                       unsigned int, flags, struct sockaddr __user *, addr,
 755                       int __user *, addrlen)
 756{
 757        return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
 758}
 759
 760COMPAT_SYSCALL_DEFINE5(recvmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 761                       unsigned int, vlen, unsigned int, flags,
 762                       struct compat_timespec __user *, timeout)
 763{
 764        int datagrams;
 765        struct timespec ktspec;
 766
 767        if (timeout == NULL)
 768                return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 769                                      flags | MSG_CMSG_COMPAT, NULL);
 770
 771        if (compat_get_timespec(&ktspec, timeout))
 772                return -EFAULT;
 773
 774        datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 775                                   flags | MSG_CMSG_COMPAT, &ktspec);
 776        if (datagrams > 0 && compat_put_timespec(&ktspec, timeout))
 777                datagrams = -EFAULT;
 778
 779        return datagrams;
 780}
 781
 782COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 783{
 784        int ret;
 785        u32 a[6];
 786        u32 a0, a1;
 787
 788        if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 789                return -EINVAL;
 790        if (copy_from_user(a, args, nas[call]))
 791                return -EFAULT;
 792        a0 = a[0];
 793        a1 = a[1];
 794
 795        switch (call) {
 796        case SYS_SOCKET:
 797                ret = sys_socket(a0, a1, a[2]);
 798                break;
 799        case SYS_BIND:
 800                ret = sys_bind(a0, compat_ptr(a1), a[2]);
 801                break;
 802        case SYS_CONNECT:
 803                ret = sys_connect(a0, compat_ptr(a1), a[2]);
 804                break;
 805        case SYS_LISTEN:
 806                ret = sys_listen(a0, a1);
 807                break;
 808        case SYS_ACCEPT:
 809                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 810                break;
 811        case SYS_GETSOCKNAME:
 812                ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 813                break;
 814        case SYS_GETPEERNAME:
 815                ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 816                break;
 817        case SYS_SOCKETPAIR:
 818                ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 819                break;
 820        case SYS_SEND:
 821                ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 822                break;
 823        case SYS_SENDTO:
 824                ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 825                break;
 826        case SYS_RECV:
 827                ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 828                break;
 829        case SYS_RECVFROM:
 830                ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 831                                          compat_ptr(a[4]), compat_ptr(a[5]));
 832                break;
 833        case SYS_SHUTDOWN:
 834                ret = sys_shutdown(a0, a1);
 835                break;
 836        case SYS_SETSOCKOPT:
 837                ret = compat_sys_setsockopt(a0, a1, a[2],
 838                                compat_ptr(a[3]), a[4]);
 839                break;
 840        case SYS_GETSOCKOPT:
 841                ret = compat_sys_getsockopt(a0, a1, a[2],
 842                                compat_ptr(a[3]), compat_ptr(a[4]));
 843                break;
 844        case SYS_SENDMSG:
 845                ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 846                break;
 847        case SYS_SENDMMSG:
 848                ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 849                break;
 850        case SYS_RECVMSG:
 851                ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 852                break;
 853        case SYS_RECVMMSG:
 854                ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
 855                                          compat_ptr(a[4]));
 856                break;
 857        case SYS_ACCEPT4:
 858                ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 859                break;
 860        default:
 861                ret = -EINVAL;
 862                break;
 863        }
 864        return ret;
 865}
 866
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