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, struct sock *sk,
 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         int err = -EFAULT;
 146
 147         kcmlen = 0;
 148         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 149         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 150         while(ucmsg != NULL) {
 151                 if(get_user(ucmlen, &ucmsg->cmsg_len))
 152                         return -EFAULT;
 153
 154                 /* Catch bogons. */
 155                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 156                         return -EINVAL;
 157
 158                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 159                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 160                 tmp = CMSG_ALIGN(tmp);
 161                 kcmlen += tmp;
 162                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 163         }
 164         if(kcmlen == 0)
 165                 return -EINVAL;
 166
 167         /* The kcmlen holds the 64-bit version of the control length.
 168          * It may not be modified as we do not stick it into the kmsg
 169          * until we have successfully copied over all of the data
 170          * from the user.
 171          */
 172         if (kcmlen > stackbuf_size)
 173                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 174         if (kcmsg == NULL)
 175                 return -ENOBUFS;
 176
 177         /* Now copy them over neatly. */
 178         memset(kcmsg, 0, kcmlen);
 179         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 180         while(ucmsg != NULL) {
 181                 if (__get_user(ucmlen, &ucmsg->cmsg_len))
 182                         goto Efault;
 183                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 184                         goto Einval;
 185                 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 186                        CMSG_ALIGN(sizeof(struct cmsghdr)));
 187                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 188                         goto Einval;
 189                 kcmsg->cmsg_len = tmp;
 190                 tmp = CMSG_ALIGN(tmp);
 191                 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 192                     __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 193                     copy_from_user(CMSG_DATA(kcmsg),
 194                                    CMSG_COMPAT_DATA(ucmsg),
 195                                    (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 196                         goto Efault;
 197
 198                 /* Advance. */
 199                 kcmsg = (struct cmsghdr *)((char *)kcmsg + 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 Einval:
 209         err = -EINVAL;
 210 Efault:
 211         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 212                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 213         return err;
 214 }
 215
 216 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 217 {
 218         struct compat_timeval ctv;
 219         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 220         struct compat_cmsghdr cmhdr;
 221         int cmlen;
 222
 223         if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 224                 kmsg->msg_flags |= MSG_CTRUNC;
 225                 return 0; /* XXX: return error? check spec. */
 226         }
 227
 228         if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
 229                 struct timeval *tv = (struct timeval *)data;
 230                 ctv.tv_sec = tv->tv_sec;
 231                 ctv.tv_usec = tv->tv_usec;
 232                 data = &ctv;
 233                 len = sizeof(struct compat_timeval);
 234         }
 235
 236         cmlen = CMSG_COMPAT_LEN(len);
 237         if(kmsg->msg_controllen < cmlen) {
 238                 kmsg->msg_flags |= MSG_CTRUNC;
 239                 cmlen = kmsg->msg_controllen;
 240         }
 241         cmhdr.cmsg_level = level;
 242         cmhdr.cmsg_type = type;
 243         cmhdr.cmsg_len = cmlen;
 244
 245         if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
 246                 return -EFAULT;
 247         if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 248                 return -EFAULT;
 249         cmlen = CMSG_COMPAT_SPACE(len);
 250         kmsg->msg_control += cmlen;
 251         kmsg->msg_controllen -= cmlen;
 252         return 0;
 253 }
 254
 255 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 256 {
 257         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 258         int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 259         int fdnum = scm->fp->count;
 260         struct file **fp = scm->fp->fp;
 261         int __user *cmfptr;
 262         int err = 0, i;
 263
 264         if (fdnum < fdmax)
 265                 fdmax = fdnum;
 266
 267         for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 268                 int new_fd;
 269                 err = security_file_receive(fp[i]);
 270                 if (err)
 271                         break;
 272                 err = get_unused_fd();
 273                 if (err < 0)
 274                         break;
 275                 new_fd = err;
 276                 err = put_user(new_fd, cmfptr);
 277                 if (err) {
 278                         put_unused_fd(new_fd);
 279                         break;
 280                 }
 281                 /* Bump the usage count and install the file. */
 282                 get_file(fp[i]);
 283                 fd_install(new_fd, fp[i]);
 284         }
 285
 286         if (i > 0) {
 287                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 288                 if (!err)
 289                         err = put_user(SOL_SOCKET, &cm->cmsg_level);
 290                 if (!err)
 291                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 292                 if (!err)
 293                         err = put_user(cmlen, &cm->cmsg_len);
 294                 if (!err) {
 295                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 296                         kmsg->msg_control += cmlen;
 297                         kmsg->msg_controllen -= cmlen;
 298                 }
 299         }
 300         if (i < fdnum)
 301                 kmsg->msg_flags |= MSG_CTRUNC;
 302
 303         /*
 304          * All of the files that fit in the message have had their
 305          * usage counts incremented, so we just free the list.
 306          */
 307         __scm_destroy(scm);
 308 }
 309
 310 /*
 311  * For now, we assume that the compatibility and native version
 312  * of struct ipt_entry are the same - sfr.  FIXME
 313  */
 314 struct compat_ipt_replace {
 315         char                    name[IPT_TABLE_MAXNAMELEN];
 316         u32                     valid_hooks;
 317         u32                     num_entries;
 318         u32                     size;
 319         u32                     hook_entry[NF_IP_NUMHOOKS];
 320         u32                     underflow[NF_IP_NUMHOOKS];
 321         u32                     num_counters;
 322         compat_uptr_t           counters;       /* struct ipt_counters * */
 323         struct ipt_entry        entries[0];
 324 };
 325
 326 static int do_netfilter_replace(int fd, int level, int optname,
 327                                 char __user *optval, int optlen)
 328 {
 329         struct compat_ipt_replace __user *urepl;
 330         struct ipt_replace __user *repl_nat;
 331         char name[IPT_TABLE_MAXNAMELEN];
 332         u32 origsize, tmp32, num_counters;
 333         unsigned int repl_nat_size;
 334         int ret;
 335         int i;
 336         compat_uptr_t ucntrs;
 337
 338         urepl = (struct compat_ipt_replace __user *)optval;
 339         if (get_user(origsize, &urepl->size))
 340                 return -EFAULT;
 341
 342         /* Hack: Causes ipchains to give correct error msg --RR */
 343         if (optlen != sizeof(*urepl) + origsize)
 344                 return -ENOPROTOOPT;
 345
 346         /* XXX Assumes that size of ipt_entry is the same both in
 347          *     native and compat environments.
 348          */
 349         repl_nat_size = sizeof(*repl_nat) + origsize;
 350         repl_nat = compat_alloc_user_space(repl_nat_size);
 351
 352         ret = -EFAULT;
 353         if (put_user(origsize, &repl_nat->size))
 354                 goto out;
 355
 356         if (!access_ok(VERIFY_READ, urepl, optlen) ||
 357             !access_ok(VERIFY_WRITE, repl_nat, optlen))
 358                 goto out;
 359
 360         if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
 361             __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
 362                 goto out;
 363
 364         if (__get_user(tmp32, &urepl->valid_hooks) ||
 365             __put_user(tmp32, &repl_nat->valid_hooks))
 366                 goto out;
 367
 368         if (__get_user(tmp32, &urepl->num_entries) ||
 369             __put_user(tmp32, &repl_nat->num_entries))
 370                 goto out;
 371
 372         if (__get_user(num_counters, &urepl->num_counters) ||
 373             __put_user(num_counters, &repl_nat->num_counters))
 374                 goto out;
 375
 376         if (__get_user(ucntrs, &urepl->counters) ||
 377             __put_user(compat_ptr(ucntrs), &repl_nat->counters))
 378                 goto out;
 379
 380         if (__copy_in_user(&repl_nat->entries[0],
 381                            &urepl->entries[0],
 382                            origsize))
 383                 goto out;
 384
 385         for (i = 0; i < NF_IP_NUMHOOKS; i++) {
 386                 if (__get_user(tmp32, &urepl->hook_entry[i]) ||
 387                     __put_user(tmp32, &repl_nat->hook_entry[i]) ||
 388                     __get_user(tmp32, &urepl->underflow[i]) ||
 389                     __put_user(tmp32, &repl_nat->underflow[i]))
 390                         goto out;
 391         }
 392
 393         /*
 394          * Since struct ipt_counters just contains two u_int64_t members
 395          * we can just do the access_ok check here and pass the (converted)
 396          * pointer into the standard syscall.  We hope that the pointer is
 397          * not misaligned ...
 398          */
 399         if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
 400                        num_counters * sizeof(struct ipt_counters)))
 401                 goto out;
 402
 403
 404         ret = sys_setsockopt(fd, level, optname,
 405                              (char __user *)repl_nat, repl_nat_size);
 406
 407 out:
 408         return ret;
 409 }
 410
 411 /*
 412  * A struct sock_filter is architecture independent.
 413  */
 414 struct compat_sock_fprog {
 415         u16             len;
 416         compat_uptr_t   filter;         /* struct sock_filter * */
 417 };
 418
 419 static int do_set_attach_filter(int fd, int level, int optname,
 420                                 char __user *optval, int optlen)
 421 {
 422         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 423         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 424         compat_uptr_t ptr;
 425         u16 len;
 426
 427         if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 428             !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 429             __get_user(len, &fprog32->len) ||
 430             __get_user(ptr, &fprog32->filter) ||
 431             __put_user(len, &kfprog->len) ||
 432             __put_user(compat_ptr(ptr), &kfprog->filter))
 433                 return -EFAULT;
 434
 435         return sys_setsockopt(fd, level, optname, (char __user *)kfprog,
 436                               sizeof(struct sock_fprog));
 437 }
 438
 439 static int do_set_sock_timeout(int fd, int level, int optname, char __user *optval, int optlen)
 440 {
 441         struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 442         struct timeval ktime;
 443         mm_segment_t old_fs;
 444         int err;
 445
 446         if (optlen < sizeof(*up))
 447                 return -EINVAL;
 448         if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 449             __get_user(ktime.tv_sec, &up->tv_sec) ||
 450             __get_user(ktime.tv_usec, &up->tv_usec))
 451                 return -EFAULT;
 452         old_fs = get_fs();
 453         set_fs(KERNEL_DS);
 454         err = sys_setsockopt(fd, level, optname, (char *) &ktime, sizeof(ktime));
 455         set_fs(old_fs);
 456
 457         return err;
 458 }
 459
 460 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 461                                 char __user *optval, int optlen)
 462 {
 463         /* SO_SET_REPLACE seems to be the same in all levels */
 464         if (optname == IPT_SO_SET_REPLACE)
 465                 return do_netfilter_replace(fd, level, optname,
 466                                             optval, optlen);
 467         if (level == SOL_SOCKET && optname == SO_ATTACH_FILTER)
 468                 return do_set_attach_filter(fd, level, optname,
 469                                             optval, optlen);
 470         if (level == SOL_SOCKET &&
 471             (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
 472                 return do_set_sock_timeout(fd, level, optname, optval, optlen);
 473
 474         return sys_setsockopt(fd, level, optname, optval, optlen);
 475 }
 476
 477 static int do_get_sock_timeout(int fd, int level, int optname,
 478                 char __user *optval, int __user *optlen)
 479 {
 480         struct compat_timeval __user *up;
 481         struct timeval ktime;
 482         mm_segment_t old_fs;
 483         int len, err;
 484
 485         up = (struct compat_timeval __user *) optval;
 486         if (get_user(len, optlen))
 487                 return -EFAULT;
 488         if (len < sizeof(*up))
 489                 return -EINVAL;
 490         len = sizeof(ktime);
 491         old_fs = get_fs();
 492         set_fs(KERNEL_DS);
 493         err = sys_getsockopt(fd, level, optname, (char *) &ktime, &len);
 494         set_fs(old_fs);
 495
 496         if (!err) {
 497                 if (put_user(sizeof(*up), optlen) ||
 498                     !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 499                     __put_user(ktime.tv_sec, &up->tv_sec) ||
 500                     __put_user(ktime.tv_usec, &up->tv_usec))
 501                         err = -EFAULT;
 502         }
 503         return err;
 504 }
 505
 506 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 507                                 char __user *optval, int __user *optlen)
 508 {
 509         if (level == SOL_SOCKET &&
 510             (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO))
 511                 return do_get_sock_timeout(fd, level, optname, optval, optlen);
 512         return sys_getsockopt(fd, level, optname, optval, optlen);
 513 }
 514
 515 /* Argument list sizes for compat_sys_socketcall */
 516 #define AL(x) ((x) * sizeof(u32))
 517 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 518                                 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 519                                 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
 520 #undef AL
 521
 522 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 523 {
 524         return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 525 }
 526
 527 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 528 {
 529         return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 530 }
 531
 532 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 533 {
 534         int ret;
 535         u32 a[6];
 536         u32 a0, a1;
 537
 538         if (call < SYS_SOCKET || call > SYS_RECVMSG)
 539                 return -EINVAL;
 540         if (copy_from_user(a, args, nas[call]))
 541                 return -EFAULT;
 542         a0 = a[0];
 543         a1 = a[1];
 544
 545         switch(call) {
 546         case SYS_SOCKET:
 547                 ret = sys_socket(a0, a1, a[2]);
 548                 break;
 549         case SYS_BIND:
 550                 ret = sys_bind(a0, compat_ptr(a1), a[2]);
 551                 break;
 552         case SYS_CONNECT:
 553                 ret = sys_connect(a0, compat_ptr(a1), a[2]);
 554                 break;
 555         case SYS_LISTEN:
 556                 ret = sys_listen(a0, a1);
 557                 break;
 558         case SYS_ACCEPT:
 559                 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
 560                 break;
 561         case SYS_GETSOCKNAME:
 562                 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 563                 break;
 564         case SYS_GETPEERNAME:
 565                 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 566                 break;
 567         case SYS_SOCKETPAIR:
 568                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 569                 break;
 570         case SYS_SEND:
 571                 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 572                 break;
 573         case SYS_SENDTO:
 574                 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 575                 break;
 576         case SYS_RECV:
 577                 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 578                 break;
 579         case SYS_RECVFROM:
 580                 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 581                 break;
 582         case SYS_SHUTDOWN:
 583                 ret = sys_shutdown(a0,a1);
 584                 break;
 585         case SYS_SETSOCKOPT:
 586                 ret = compat_sys_setsockopt(a0, a1, a[2],
 587                                 compat_ptr(a[3]), a[4]);
 588                 break;
 589         case SYS_GETSOCKOPT:
 590                 ret = compat_sys_getsockopt(a0, a1, a[2],
 591                                 compat_ptr(a[3]), compat_ptr(a[4]));
 592                 break;
 593         case SYS_SENDMSG:
 594                 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 595                 break;
 596         case SYS_RECVMSG:
 597                 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 598                 break;
 599         default:
 600                 ret = -EINVAL;
 601                 break;
 602         }
 603         return ret;
 604 }