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
  26 #include <net/scm.h>
  27 #include <net/sock.h>
  28 #include <asm/uaccess.h>
  29 #include <net/compat.h>
  30
  31 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
  32                                           struct compat_iovec __user *uiov32,
  33                                           int niov)
  34 {
  35         int tot_len = 0;
  36
  37         while(niov > 0) {
  38                 compat_uptr_t buf;
  39                 compat_size_t len;
  40
  41                 if(get_user(len, &uiov32->iov_len) ||
  42                    get_user(buf, &uiov32->iov_base)) {
  43                         tot_len = -EFAULT;
  44                         break;
  45                 }
  46                 tot_len += len;
  47                 kiov->iov_base = compat_ptr(buf);
  48                 kiov->iov_len = (__kernel_size_t) len;
  49                 uiov32++;
  50                 kiov++;
  51                 niov--;
  52         }
  53         return tot_len;
  54 }
  55
  56 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
  57 {
  58         compat_uptr_t tmp1, tmp2, tmp3;
  59
  60         if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
  61             __get_user(tmp1, &umsg->msg_name) ||
  62             __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
  63             __get_user(tmp2, &umsg->msg_iov) ||
  64             __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
  65             __get_user(tmp3, &umsg->msg_control) ||
  66             __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
  67             __get_user(kmsg->msg_flags, &umsg->msg_flags))
  68                 return -EFAULT;
  69         kmsg->msg_name = compat_ptr(tmp1);
  70         kmsg->msg_iov = compat_ptr(tmp2);
  71         kmsg->msg_control = compat_ptr(tmp3);
  72         return 0;
  73 }
  74
  75 /* I've named the args so it is easy to tell whose space the pointers are in. */
  76 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
  77                    char *kern_address, int mode)
  78 {
  79         int tot_len;
  80
  81         if(kern_msg->msg_namelen) {
  82                 if(mode==VERIFY_READ) {
  83                         int err = move_addr_to_kernel(kern_msg->msg_name,
  84                                                       kern_msg->msg_namelen,
  85                                                       kern_address);
  86                         if(err < 0)
  87                                 return err;
  88                 }
  89                 kern_msg->msg_name = kern_address;
  90         } else
  91                 kern_msg->msg_name = NULL;
  92
  93         if(kern_msg->msg_iovlen > UIO_FASTIOV) {
  94                 kern_iov = kmalloc(kern_msg->msg_iovlen * sizeof(struct iovec),
  95                                    GFP_KERNEL);
  96                 if(!kern_iov)
  97                         return -ENOMEM;
  98         }
  99
 100         tot_len = iov_from_user_compat_to_kern(kern_iov,
 101                                           (struct compat_iovec __user *)kern_msg->msg_iov,
 102                                           kern_msg->msg_iovlen);
 103         if(tot_len >= 0)
 104                 kern_msg->msg_iov = kern_iov;
 105         else if(kern_msg->msg_iovlen > UIO_FASTIOV)
 106                 kfree(kern_iov);
 107
 108         return tot_len;
 109 }
 110
 111 /* Bleech... */
 112 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 113
 114 #define CMSG_COMPAT_DATA(cmsg)                          \
 115         ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 116 #define CMSG_COMPAT_SPACE(len)                          \
 117         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 118 #define CMSG_COMPAT_LEN(len)                            \
 119         (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
 120
 121 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 122         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 123          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 124          (struct compat_cmsghdr __user *)NULL)
 125
 126 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 127                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 128 {
 129         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 130         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 131                         msg->msg_controllen)
 132                 return NULL;
 133         return (struct compat_cmsghdr __user *)ptr;
 134 }
 135
 136 /* There is a lot of hair here because the alignment rules (and
 137  * thus placement) of cmsg headers and length are different for
 138  * 32-bit apps.  -DaveM
 139  */
 140 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg,
 141                                unsigned char *stackbuf, int stackbuf_size)
 142 {
 143         struct compat_cmsghdr __user *ucmsg;
 144         struct cmsghdr *kcmsg, *kcmsg_base;
 145         compat_size_t ucmlen;
 146         __kernel_size_t kcmlen, tmp;
 147
 148         kcmlen = 0;
 149         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 150         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 151         while(ucmsg != NULL) {
 152                 if(get_user(ucmlen, &ucmsg->cmsg_len))
 153                         return -EFAULT;
 154
 155                 /* Catch bogons. */
 156                 if(CMSG_COMPAT_ALIGN(ucmlen) <
 157                    CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))
 158                         return -EINVAL;
 159                 if((unsigned long)(((char __user *)ucmsg - (char __user *)kmsg->msg_control)
 160                                    + ucmlen) > kmsg->msg_controllen)
 161                         return -EINVAL;
 162
 163                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 164                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 165                 kcmlen += tmp;
 166                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 167         }
 168         if(kcmlen == 0)
 169                 return -EINVAL;
 170
 171         /* The kcmlen holds the 64-bit version of the control length.
 172          * It may not be modified as we do not stick it into the kmsg
 173          * until we have successfully copied over all of the data
 174          * from the user.
 175          */
 176         if(kcmlen > stackbuf_size)
 177                 kcmsg_base = kcmsg = kmalloc(kcmlen, GFP_KERNEL);
 178         if(kcmsg == NULL)
 179                 return -ENOBUFS;
 180
 181         /* Now copy them over neatly. */
 182         memset(kcmsg, 0, kcmlen);
 183         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 184         while(ucmsg != NULL) {
 185                 __get_user(ucmlen, &ucmsg->cmsg_len);
 186                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 187                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 188                 kcmsg->cmsg_len = tmp;
 189                 __get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level);
 190                 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type);
 191
 192                 /* Copy over the data. */
 193                 if(copy_from_user(CMSG_DATA(kcmsg),
 194                                   CMSG_COMPAT_DATA(ucmsg),
 195                                   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 196                         goto out_free_efault;
 197
 198                 /* Advance. */
 199                 kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(tmp));
 200                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 201         }
 202
 203         /* Ok, looks like we made it.  Hook it up and return success. */
 204         kmsg->msg_control = kcmsg_base;
 205         kmsg->msg_controllen = kcmlen;
 206         return 0;
 207
 208 out_free_efault:
 209         if(kcmsg_base != (struct cmsghdr *)stackbuf)
 210                 kfree(kcmsg_base);
 211         return -EFAULT;
 212 }
 213
 214 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 215 {
 216         struct compat_timeval ctv;
 217         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 218         struct compat_cmsghdr cmhdr;
 219         int cmlen;
 220
 221         if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 222                 kmsg->msg_flags |= MSG_CTRUNC;
 223                 return 0; /* XXX: return error? check spec. */
 224         }
 225
 226         if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
 227                 struct timeval *tv = (struct timeval *)data;
 228                 ctv.tv_sec = tv->tv_sec;
 229                 ctv.tv_usec = tv->tv_usec;
 230                 data = &ctv;
 231                 len = sizeof(struct compat_timeval);
 232         }
 233
 234         cmlen = CMSG_COMPAT_LEN(len);
 235         if(kmsg->msg_controllen < cmlen) {
 236                 kmsg->msg_flags |= MSG_CTRUNC;
 237                 cmlen = kmsg->msg_controllen;
 238         }
 239         cmhdr.cmsg_level = level;
 240         cmhdr.cmsg_type = type;
 241         cmhdr.cmsg_len = cmlen;
 242
 243         if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
 244                 return -EFAULT;
 245         if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 246                 return -EFAULT;
 247         cmlen = CMSG_COMPAT_SPACE(len);
 248         kmsg->msg_control += cmlen;
 249         kmsg->msg_controllen -= cmlen;
 250         return 0;
 251 }
 252
 253 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 254 {
 255         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 256         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 257         int fdnum = scm->fp->count;
 258         struct file **fp = scm->fp->fp;
 259         int __user *cmfptr;
 260         int err = 0, i;
 261
 262         if (fdnum < fdmax)
 263                 fdmax = fdnum;
 264
 265         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 266                 int new_fd;
 267                 err = get_unused_fd();
 268                 if (err < 0)
 269                         break;
 270                 new_fd = err;
 271                 err = put_user(new_fd, cmfptr);
 272                 if (err) {
 273                         put_unused_fd(new_fd);
 274                         break;
 275                 }
 276                 /* Bump the usage count and install the file. */
 277                 get_file(fp[i]);
 278                 fd_install(new_fd, fp[i]);
 279         }
 280
 281         if (i > 0) {
 282                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 283                 if (!err)
 284                         err = put_user(SOL_SOCKET, &cm->cmsg_level);
 285                 if (!err)
 286                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 287                 if (!err)
 288                         err = put_user(cmlen, &cm->cmsg_len);
 289                 if (!err) {
 290                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 291                         kmsg->msg_control += cmlen;
 292                         kmsg->msg_controllen -= cmlen;
 293                 }
 294         }
 295         if (i < fdnum)
 296                 kmsg->msg_flags |= MSG_CTRUNC;
 297
 298         /*
 299          * All of the files that fit in the message have had their
 300          * usage counts incremented, so we just free the list.
 301          */
 302         __scm_destroy(scm);
 303 }
 304
 305 /*
 306  * For now, we assume that the compatibility and native version
 307  * of struct ipt_entry are the same - sfr.  FIXME
 308  */
 309 struct compat_ipt_replace {
 310         char                    name[IPT_TABLE_MAXNAMELEN];
 311         u32                     valid_hooks;
 312         u32                     num_entries;
 313         u32                     size;
 314         u32                     hook_entry[NF_IP_NUMHOOKS];
 315         u32                     underflow[NF_IP_NUMHOOKS];
 316         u32                     num_counters;
 317         compat_uptr_t           counters;       /* struct ipt_counters * */
 318         struct ipt_entry        entries[0];
 319 };
 320
 321 static int do_netfilter_replace(int fd, int level, int optname,
 322                                 char __user *optval, int optlen)
 323 {
 324         struct compat_ipt_replace __user *urepl;
 325         struct ipt_replace __user *repl_nat;
 326         char name[IPT_TABLE_MAXNAMELEN];
 327         u32 origsize, tmp32, num_counters;
 328         unsigned int repl_nat_size;
 329         int ret;
 330         int i;
 331         compat_uptr_t ucntrs;
 332
 333         urepl = (struct compat_ipt_replace __user *)optval;
 334         if (get_user(origsize, &urepl->size))
 335                 return -EFAULT;
 336
 337         /* Hack: Causes ipchains to give correct error msg --RR */
 338         if (optlen != sizeof(*urepl) + origsize)
 339                 return -ENOPROTOOPT;
 340
 341         /* XXX Assumes that size of ipt_entry is the same both in
 342          *     native and compat environments.
 343          */
 344         repl_nat_size = sizeof(*repl_nat) + origsize;
 345         repl_nat = compat_alloc_user_space(repl_nat_size);
 346
 347         ret = -EFAULT;
 348         if (put_user(origsize, &repl_nat->size))
 349                 goto out;
 350
 351         if (!access_ok(VERIFY_READ, urepl, optlen) ||
 352             !access_ok(VERIFY_WRITE, repl_nat, optlen))
 353                 goto out;
 354
 355         if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
 356             __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
 357                 goto out;
 358
 359         if (__get_user(tmp32, &urepl->valid_hooks) ||
 360             __put_user(tmp32, &repl_nat->valid_hooks))
 361                 goto out;
 362
 363         if (__get_user(tmp32, &urepl->num_entries) ||
 364             __put_user(tmp32, &repl_nat->num_entries))
 365                 goto out;
 366
 367         if (__get_user(num_counters, &urepl->num_counters) ||
 368             __put_user(num_counters, &repl_nat->num_counters))
 369                 goto out;
 370
 371         if (__get_user(ucntrs, &urepl->counters) ||
 372             __put_user(compat_ptr(ucntrs), &repl_nat->counters))
 373                 goto out;
 374
 375         if (__copy_in_user(&repl_nat->entries[0],
 376                            &urepl->entries[0],
 377                            origsize))
 378                 goto out;
 379
 380         for (i = 0; i < NF_IP_NUMHOOKS; i++) {
 381                 if (__get_user(tmp32, &urepl->hook_entry[i]) ||
 382                     __put_user(tmp32, &repl_nat->hook_entry[i]) ||
 383                     __get_user(tmp32, &urepl->underflow[i]) ||
 384                     __put_user(tmp32, &repl_nat->underflow[i]))
 385                         goto out;
 386         }
 387
 388         /*
 389          * Since struct ipt_counters just contains two u_int64_t members
 390          * we can just do the access_ok check here and pass the (converted)
 391          * pointer into the standard syscall.  We hope that the pointer is
 392          * not misaligned ...
 393          */
 394         if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
 395                        num_counters * sizeof(struct ipt_counters)))
 396                 goto out;
 397
 398
 399         ret = sys_setsockopt(fd, level, optname,
 400                              (char __user *)repl_nat, repl_nat_size);
 401
 402 out:
 403         return ret;
 404 }
 405
 406 /*
 407  * A struct sock_filter is architecture independent.
 408  */
 409 struct compat_sock_fprog {
 410         u16             len;
 411         compat_uptr_t   filter;         /* struct sock_filter * */
 412 };
 413
 414 static int do_set_attach_filter(int fd, int level, int optname,
 415                                 char __user *optval, int optlen)
 416 {
 417         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 418         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 419         compat_uptr_t ptr;
 420         u16 len;
 421
 422         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 423             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 424             __get_user(len, &fprog32->len) ||
 425             __get_user(ptr, &fprog32->filter) ||
 426             __put_user(len, &kfprog->len) ||
 427             __put_user(compat_ptr(ptr), &kfprog->filter))
 428                 return -EFAULT;
 429
 430         return sys_setsockopt(fd, level, optname, (char __user *)kfprog,
 431                               sizeof(struct sock_fprog));
 432 }
 433
 434 static int do_set_sock_timeout(int fd, int level, int optname, char __user *optval, int optlen)
 435 {
 436         struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 437         struct timeval ktime;
 438         mm_segment_t old_fs;
 439         int err;
 440
 441         if (optlen < sizeof(*up))
 442                 return -EINVAL;
 443         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 444             __get_user(ktime.tv_sec, &up->tv_sec) ||
 445             __get_user(ktime.tv_usec, &up->tv_usec))
 446                 return -EFAULT;
 447         old_fs = get_fs();
 448         set_fs(KERNEL_DS);
 449         err = sys_setsockopt(fd, level, optname, (char *) &ktime, sizeof(ktime));
 450         set_fs(old_fs);
 451
 452         return err;
 453 }
 454
 455 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 456                                 char __user *optval, int optlen)
 457 {
 458         /* SO_SET_REPLACE seems to be the same in all levels */
 459         if (optname == IPT_SO_SET_REPLACE)
 460                 return do_netfilter_replace(fd, level, optname,
 461                                             optval, optlen);
 462         if (level == SOL_SOCKET && optname == SO_ATTACH_FILTER)
 463                 return do_set_attach_filter(fd, level, optname,
 464                                             optval, optlen);
 465         if (level == SOL_SOCKET &&
 466             (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
 467                 return do_set_sock_timeout(fd, level, optname, optval, optlen);
 468
 469         return sys_setsockopt(fd, level, optname, optval, optlen);
 470 }
 471
 472 static int do_get_sock_timeout(int fd, int level, int optname,
 473                 char __user *optval, int __user *optlen)
 474 {
 475         struct compat_timeval __user *up;
 476         struct timeval ktime;
 477         mm_segment_t old_fs;
 478         int len, err;
 479
 480         up = (struct compat_timeval __user *) optval;
 481         if (get_user(len, optlen))
 482                 return -EFAULT;
 483         if (len < sizeof(*up))
 484                 return -EINVAL;
 485         len = sizeof(ktime);
 486         old_fs = get_fs();
 487         set_fs(KERNEL_DS);
 488         err = sys_getsockopt(fd, level, optname, (char *) &ktime, &len);
 489         set_fs(old_fs);
 490
 491         if (!err) {
 492                 if (put_user(sizeof(*up), optlen) ||
 493                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 494                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 495                     __put_user(ktime.tv_usec, &up->tv_usec))
 496                         err = -EFAULT;
 497         }
 498         return err;
 499 }
 500
 501 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 502                                 char __user *optval, int __user *optlen)
 503 {
 504         if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 505                 return do_get_sock_timeout(fd, level, optname, optval, optlen);
 506         return sys_getsockopt(fd, level, optname, optval, optlen);
 507 }
 508
 509 /* Argument list sizes for compat_sys_socketcall */
 510 #define AL(x) ((x) * sizeof(u32))
 511 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 512                                 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 513                                 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
 514 #undef AL
 515
 516 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 517 {
 518         return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 519 }
 520
 521 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 522 {
 523         return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 524 }
 525
 526 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 527 {
 528         int ret;
 529         u32 a[6];
 530         u32 a0, a1;
 531
 532         if (call < SYS_SOCKET || call > SYS_RECVMSG)
 533                 return -EINVAL;
 534         if (copy_from_user(a, args, nas[call]))
 535                 return -EFAULT;
 536         a0 = a[0];
 537         a1 = a[1];
 538
 539         switch(call) {
 540         case SYS_SOCKET:
 541                 ret = sys_socket(a0, a1, a[2]);
 542                 break;
 543         case SYS_BIND:
 544                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 545                 break;
 546         case SYS_CONNECT:
 547                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 548                 break;
 549         case SYS_LISTEN:
 550                 ret = sys_listen(a0, a1);
 551                 break;
 552         case SYS_ACCEPT:
 553                 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
 554                 break;
 555         case SYS_GETSOCKNAME:
 556                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 557                 break;
 558         case SYS_GETPEERNAME:
 559                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 560                 break;
 561         case SYS_SOCKETPAIR:
 562                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 563                 break;
 564         case SYS_SEND:
 565                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 566                 break;
 567         case SYS_SENDTO:
 568                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 569                 break;
 570         case SYS_RECV:
 571                 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 572                 break;
 573         case SYS_RECVFROM:
 574                 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 575                 break;
 576         case SYS_SHUTDOWN:
 577                 ret = sys_shutdown(a0,a1);
 578                 break;
 579         case SYS_SETSOCKOPT:
 580                 ret = compat_sys_setsockopt(a0, a1, a[2],
 581                                 compat_ptr(a[3]), a[4]);
 582                 break;
 583         case SYS_GETSOCKOPT:
 584                 ret = compat_sys_getsockopt(a0, a1, a[2],
 585                                 compat_ptr(a[3]), compat_ptr(a[4]));
 586                 break;
 587         case SYS_SENDMSG:
 588                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 589                 break;
 590         case SYS_RECVMSG:
 591                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 592                 break;
 593         default:
 594                 ret = -EINVAL;
 595                 break;
 596         }
 597         return ret;
 598 }