net/compat.c

   1 /*
   2  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   3  *
   4  * Copyright (C) 2000           VA Linux Co
   5  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   6  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   9  * Copyright (C) 2000           Hewlett-Packard Co.
  10  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/fs.h>
  16 #include <linux/sched.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/netfilter_ipv4/ip_tables.h>
  25 #include <linux/security.h>
  26
  27 #include <net/scm.h>
  28 #include <net/sock.h>
  29 #include <asm/uaccess.h>
  30 #include <net/compat.h>
  31
  32 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  33                                           struct compat_iovec __user *uiov32,
  34                                           int niov)
  35 {
  36         int tot_len = 0;
  37
  38         while(niov > 0) {
  39                 compat_uptr_t buf;
  40                 compat_size_t len;
  41
  42                 if(get_user(len, &uiov32->iov_len) ||
  43                    get_user(buf, &uiov32->iov_base)) {
  44                         tot_len = -EFAULT;
  45                         break;
  46                 }
  47                 tot_len += len;
  48                 kiov->iov_base = compat_ptr(buf);
  49                 kiov->iov_len = (__kernel_size_t) len;
  50                 uiov32++;
  51                 kiov++;
  52                 niov--;
  53         }
  54         return tot_len;
  55 }
  56
  57 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  58 {
  59         compat_uptr_t tmp1, tmp2, tmp3;
  60
  61         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  62             __get_user(tmp1, &umsg->msg_name) ||
  63             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  64             __get_user(tmp2, &umsg->msg_iov) ||
  65             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  66             __get_user(tmp3, &umsg->msg_control) ||
  67             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  68             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  69                 return -EFAULT;
  70         kmsg->msg_name = compat_ptr(tmp1);
  71         kmsg->msg_iov = compat_ptr(tmp2);
  72         kmsg->msg_control = compat_ptr(tmp3);
  73         return 0;
  74 }
  75
  76 /* I've named the args so it is easy to tell whose space the pointers are in. */
  77 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  78                    char *kern_address, int mode)
  79 {
  80         int tot_len;
  81
  82         if(kern_msg->msg_namelen) {
  83                 if(mode==VERIFY_READ) {
  84                         int err = move_addr_to_kernel(kern_msg->msg_name,
  85                                                       kern_msg->msg_namelen,
  86                                                       kern_address);
  87                         if(err < 0)
  88                                 return err;
  89                 }
  90                 kern_msg->msg_name = kern_address;
  91         } else
  92                 kern_msg->msg_name = NULL;
  93
  94         tot_len = iov_from_user_compat_to_kern(kern_iov,
  95                                           (struct compat_iovec __user *)kern_msg->msg_iov,
  96                                           kern_msg->msg_iovlen);
  97         if(tot_len >= 0)
  98                 kern_msg->msg_iov = kern_iov;
  99
 100         return tot_len;
 101 }
 102
 103 /* Bleech... */
 104 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 105
 106 #define CMSG_COMPAT_DATA(cmsg)                          \
 107         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 108 #define CMSG_COMPAT_SPACE(len)                          \
 109         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 110 #define CMSG_COMPAT_LEN(len)                            \
 111         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 112
 113 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 114         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 115          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 116          (struct compat_cmsghdr __user *)NULL)
 117
 118 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 119         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 120          (ucmlen) <= (unsigned long) \
 121          ((mhdr)->msg_controllen - \
 122           ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
 123
 124 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 125                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 126 {
 127         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 128         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 129                         msg->msg_controllen)
 130                 return NULL;
 131         return (struct compat_cmsghdr __user *)ptr;
 132 }
 133
 134 /* There is a lot of hair here because the alignment rules (and
 135  * thus placement) of cmsg headers and length are different for
 136  * 32-bit apps.  -DaveM
 137  */
 138 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg,
 139                                unsigned char *stackbuf, int stackbuf_size)
 140 {
 141         struct compat_cmsghdr __user *ucmsg;
 142         struct cmsghdr *kcmsg, *kcmsg_base;
 143         compat_size_t ucmlen;
 144         __kernel_size_t kcmlen, tmp;
 145
 146         kcmlen = 0;
 147         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 148         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 149         while(ucmsg != NULL) {
 150                 if(get_user(ucmlen, &ucmsg->cmsg_len))
 151                         return -EFAULT;
 152
 153                 /* Catch bogons. */
 154                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 155                         return -EINVAL;
 156
 157                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 158                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 159                 kcmlen += tmp;
 160                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 161         }
 162         if(kcmlen == 0)
 163                 return -EINVAL;
 164
 165         /* The kcmlen holds the 64-bit version of the control length.
 166          * It may not be modified as we do not stick it into the kmsg
 167          * until we have successfully copied over all of the data
 168          * from the user.
 169          */
 170         if(kcmlen > stackbuf_size)
 171                 kcmsg_base = kcmsg = kmalloc(kcmlen, GFP_KERNEL);
 172         if(kcmsg == NULL)
 173                 return -ENOBUFS;
 174
 175         /* Now copy them over neatly. */
 176         memset(kcmsg, 0, kcmlen);
 177         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 178         while(ucmsg != NULL) {
 179                 __get_user(ucmlen, &ucmsg->cmsg_len);
 180                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 181                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 182                 kcmsg->cmsg_len = tmp;
 183                 __get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level);
 184                 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type);
 185
 186                 /* Copy over the data. */
 187                 if(copy_from_user(CMSG_DATA(kcmsg),
 188                                   CMSG_COMPAT_DATA(ucmsg),
 189                                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 190                         goto out_free_efault;
 191
 192                 /* Advance. */
 193                 kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(tmp));
 194                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 195         }
 196
 197         /* Ok, looks like we made it.  Hook it up and return success. */
 198         kmsg->msg_control = kcmsg_base;
 199         kmsg->msg_controllen = kcmlen;
 200         return 0;
 201
 202 out_free_efault:
 203         if(kcmsg_base != (struct cmsghdr *)stackbuf)
 204                 kfree(kcmsg_base);
 205         return -EFAULT;
 206 }
 207
 208 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 209 {
 210         struct compat_timeval ctv;
 211         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 212         struct compat_cmsghdr cmhdr;
 213         int cmlen;
 214
 215         if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 216                 kmsg->msg_flags |= MSG_CTRUNC;
 217                 return 0; /* XXX: return error? check spec. */
 218         }
 219
 220         if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
 221                 struct timeval *tv = (struct timeval *)data;
 222                 ctv.tv_sec = tv->tv_sec;
 223                 ctv.tv_usec = tv->tv_usec;
 224                 data = &ctv;
 225                 len = sizeof(struct compat_timeval);
 226         }
 227
 228         cmlen = CMSG_COMPAT_LEN(len);
 229         if(kmsg->msg_controllen < cmlen) {
 230                 kmsg->msg_flags |= MSG_CTRUNC;
 231                 cmlen = kmsg->msg_controllen;
 232         }
 233         cmhdr.cmsg_level = level;
 234         cmhdr.cmsg_type = type;
 235         cmhdr.cmsg_len = cmlen;
 236
 237         if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
 238                 return -EFAULT;
 239         if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 240                 return -EFAULT;
 241         cmlen = CMSG_COMPAT_SPACE(len);
 242         kmsg->msg_control += cmlen;
 243         kmsg->msg_controllen -= cmlen;
 244         return 0;
 245 }
 246
 247 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 248 {
 249         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 250         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 251         int fdnum = scm->fp->count;
 252         struct file **fp = scm->fp->fp;
 253         int __user *cmfptr;
 254         int err = 0, i;
 255
 256         if (fdnum < fdmax)
 257                 fdmax = fdnum;
 258
 259         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 260                 int new_fd;
 261                 err = security_file_receive(fp[i]);
 262                 if (err)
 263                         break;
 264                 err = get_unused_fd();
 265                 if (err < 0)
 266                         break;
 267                 new_fd = err;
 268                 err = put_user(new_fd, cmfptr);
 269                 if (err) {
 270                         put_unused_fd(new_fd);
 271                         break;
 272                 }
 273                 /* Bump the usage count and install the file. */
 274                 get_file(fp[i]);
 275                 fd_install(new_fd, fp[i]);
 276         }
 277
 278         if (i > 0) {
 279                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 280                 if (!err)
 281                         err = put_user(SOL_SOCKET, &cm->cmsg_level);
 282                 if (!err)
 283                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 284                 if (!err)
 285                         err = put_user(cmlen, &cm->cmsg_len);
 286                 if (!err) {
 287                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 288                         kmsg->msg_control += cmlen;
 289                         kmsg->msg_controllen -= cmlen;
 290                 }
 291         }
 292         if (i < fdnum)
 293                 kmsg->msg_flags |= MSG_CTRUNC;
 294
 295         /*
 296          * All of the files that fit in the message have had their
 297          * usage counts incremented, so we just free the list.
 298          */
 299         __scm_destroy(scm);
 300 }
 301
 302 /*
 303  * For now, we assume that the compatibility and native version
 304  * of struct ipt_entry are the same - sfr.  FIXME
 305  */
 306 struct compat_ipt_replace {
 307         char                    name[IPT_TABLE_MAXNAMELEN];
 308         u32                     valid_hooks;
 309         u32                     num_entries;
 310         u32                     size;
 311         u32                     hook_entry[NF_IP_NUMHOOKS];
 312         u32                     underflow[NF_IP_NUMHOOKS];
 313         u32                     num_counters;
 314         compat_uptr_t           counters;       /* struct ipt_counters * */
 315         struct ipt_entry        entries[0];
 316 };
 317
 318 static int do_netfilter_replace(int fd, int level, int optname,
 319                                 char __user *optval, int optlen)
 320 {
 321         struct compat_ipt_replace __user *urepl;
 322         struct ipt_replace __user *repl_nat;
 323         char name[IPT_TABLE_MAXNAMELEN];
 324         u32 origsize, tmp32, num_counters;
 325         unsigned int repl_nat_size;
 326         int ret;
 327         int i;
 328         compat_uptr_t ucntrs;
 329
 330         urepl = (struct compat_ipt_replace __user *)optval;
 331         if (get_user(origsize, &urepl->size))
 332                 return -EFAULT;
 333
 334         /* Hack: Causes ipchains to give correct error msg --RR */
 335         if (optlen != sizeof(*urepl) + origsize)
 336                 return -ENOPROTOOPT;
 337
 338         /* XXX Assumes that size of ipt_entry is the same both in
 339          *     native and compat environments.
 340          */
 341         repl_nat_size = sizeof(*repl_nat) + origsize;
 342         repl_nat = compat_alloc_user_space(repl_nat_size);
 343
 344         ret = -EFAULT;
 345         if (put_user(origsize, &repl_nat->size))
 346                 goto out;
 347
 348         if (!access_ok(VERIFY_READ, urepl, optlen) ||
 349             !access_ok(VERIFY_WRITE, repl_nat, optlen))
 350                 goto out;
 351
 352         if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
 353             __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
 354                 goto out;
 355
 356         if (__get_user(tmp32, &urepl->valid_hooks) ||
 357             __put_user(tmp32, &repl_nat->valid_hooks))
 358                 goto out;
 359
 360         if (__get_user(tmp32, &urepl->num_entries) ||
 361             __put_user(tmp32, &repl_nat->num_entries))
 362                 goto out;
 363
 364         if (__get_user(num_counters, &urepl->num_counters) ||
 365             __put_user(num_counters, &repl_nat->num_counters))
 366                 goto out;
 367
 368         if (__get_user(ucntrs, &urepl->counters) ||
 369             __put_user(compat_ptr(ucntrs), &repl_nat->counters))
 370                 goto out;
 371
 372         if (__copy_in_user(&repl_nat->entries[0],
 373                            &urepl->entries[0],
 374                            origsize))
 375                 goto out;
 376
 377         for (i = 0; i < NF_IP_NUMHOOKS; i++) {
 378                 if (__get_user(tmp32, &urepl->hook_entry[i]) ||
 379                     __put_user(tmp32, &repl_nat->hook_entry[i]) ||
 380                     __get_user(tmp32, &urepl->underflow[i]) ||
 381                     __put_user(tmp32, &repl_nat->underflow[i]))
 382                         goto out;
 383         }
 384
 385         /*
 386          * Since struct ipt_counters just contains two u_int64_t members
 387          * we can just do the access_ok check here and pass the (converted)
 388          * pointer into the standard syscall.  We hope that the pointer is
 389          * not misaligned ...
 390          */
 391         if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
 392                        num_counters * sizeof(struct ipt_counters)))
 393                 goto out;
 394
 395
 396         ret = sys_setsockopt(fd, level, optname,
 397                              (char __user *)repl_nat, repl_nat_size);
 398
 399 out:
 400         return ret;
 401 }
 402
 403 /*
 404  * A struct sock_filter is architecture independent.
 405  */
 406 struct compat_sock_fprog {
 407         u16             len;
 408         compat_uptr_t   filter;         /* struct sock_filter * */
 409 };
 410
 411 static int do_set_attach_filter(int fd, int level, int optname,
 412                                 char __user *optval, int optlen)
 413 {
 414         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 415         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 416         compat_uptr_t ptr;
 417         u16 len;
 418
 419         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 420             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 421             __get_user(len, &fprog32->len) ||
 422             __get_user(ptr, &fprog32->filter) ||
 423             __put_user(len, &kfprog->len) ||
 424             __put_user(compat_ptr(ptr), &kfprog->filter))
 425                 return -EFAULT;
 426
 427         return sys_setsockopt(fd, level, optname, (char __user *)kfprog,
 428                               sizeof(struct sock_fprog));
 429 }
 430
 431 static int do_set_sock_timeout(int fd, int level, int optname, char __user *optval, int optlen)
 432 {
 433         struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 434         struct timeval ktime;
 435         mm_segment_t old_fs;
 436         int err;
 437
 438         if (optlen < sizeof(*up))
 439                 return -EINVAL;
 440         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 441             __get_user(ktime.tv_sec, &up->tv_sec) ||
 442             __get_user(ktime.tv_usec, &up->tv_usec))
 443                 return -EFAULT;
 444         old_fs = get_fs();
 445         set_fs(KERNEL_DS);
 446         err = sys_setsockopt(fd, level, optname, (char *) &ktime, sizeof(ktime));
 447         set_fs(old_fs);
 448
 449         return err;
 450 }
 451
 452 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 453                                 char __user *optval, int optlen)
 454 {
 455         /* SO_SET_REPLACE seems to be the same in all levels */
 456         if (optname == IPT_SO_SET_REPLACE)
 457                 return do_netfilter_replace(fd, level, optname,
 458                                             optval, optlen);
 459         if (level == SOL_SOCKET && optname == SO_ATTACH_FILTER)
 460                 return do_set_attach_filter(fd, level, optname,
 461                                             optval, optlen);
 462         if (level == SOL_SOCKET &&
 463             (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
 464                 return do_set_sock_timeout(fd, level, optname, optval, optlen);
 465
 466         return sys_setsockopt(fd, level, optname, optval, optlen);
 467 }
 468
 469 static int do_get_sock_timeout(int fd, int level, int optname,
 470                 char __user *optval, int __user *optlen)
 471 {
 472         struct compat_timeval __user *up;
 473         struct timeval ktime;
 474         mm_segment_t old_fs;
 475         int len, err;
 476
 477         up = (struct compat_timeval __user *) optval;
 478         if (get_user(len, optlen))
 479                 return -EFAULT;
 480         if (len < sizeof(*up))
 481                 return -EINVAL;
 482         len = sizeof(ktime);
 483         old_fs = get_fs();
 484         set_fs(KERNEL_DS);
 485         err = sys_getsockopt(fd, level, optname, (char *) &ktime, &len);
 486         set_fs(old_fs);
 487
 488         if (!err) {
 489                 if (put_user(sizeof(*up), optlen) ||
 490                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 491                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 492                     __put_user(ktime.tv_usec, &up->tv_usec))
 493                         err = -EFAULT;
 494         }
 495         return err;
 496 }
 497
 498 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 499                                 char __user *optval, int __user *optlen)
 500 {
 501         if (level == SOL_SOCKET &&
 502             (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
 503                 return do_get_sock_timeout(fd, level, optname, optval, optlen);
 504         return sys_getsockopt(fd, level, optname, optval, optlen);
 505 }
 506
 507 /* Argument list sizes for compat_sys_socketcall */
 508 #define AL(x) ((x) * sizeof(u32))
 509 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 510                                 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 511                                 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
 512 #undef AL
 513
 514 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 515 {
 516         return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 517 }
 518
 519 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 520 {
 521         return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 522 }
 523
 524 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 525 {
 526         int ret;
 527         u32 a[6];
 528         u32 a0, a1;
 529
 530         if (call < SYS_SOCKET || call > SYS_RECVMSG)
 531                 return -EINVAL;
 532         if (copy_from_user(a, args, nas[call]))
 533                 return -EFAULT;
 534         a0 = a[0];
 535         a1 = a[1];
 536
 537         switch(call) {
 538         case SYS_SOCKET:
 539                 ret = sys_socket(a0, a1, a[2]);
 540                 break;
 541         case SYS_BIND:
 542                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 543                 break;
 544         case SYS_CONNECT:
 545                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 546                 break;
 547         case SYS_LISTEN:
 548                 ret = sys_listen(a0, a1);
 549                 break;
 550         case SYS_ACCEPT:
 551                 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
 552                 break;
 553         case SYS_GETSOCKNAME:
 554                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 555                 break;
 556         case SYS_GETPEERNAME:
 557                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 558                 break;
 559         case SYS_SOCKETPAIR:
 560                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 561                 break;
 562         case SYS_SEND:
 563                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 564                 break;
 565         case SYS_SENDTO:
 566                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 567                 break;
 568         case SYS_RECV:
 569                 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 570                 break;
 571         case SYS_RECVFROM:
 572                 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 573                 break;
 574         case SYS_SHUTDOWN:
 575                 ret = sys_shutdown(a0,a1);
 576                 break;
 577         case SYS_SETSOCKOPT:
 578                 ret = compat_sys_setsockopt(a0, a1, a[2],
 579                                 compat_ptr(a[3]), a[4]);
 580                 break;
 581         case SYS_GETSOCKOPT:
 582                 ret = compat_sys_getsockopt(a0, a1, a[2],
 583                                 compat_ptr(a[3]), compat_ptr(a[4]));
 584                 break;
 585         case SYS_SENDMSG:
 586                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 587                 break;
 588         case SYS_RECVMSG:
 589                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 590                 break;
 591         default:
 592                 ret = -EINVAL;
 593                 break;
 594         }
 595         return ret;
 596 }