net/compat.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
   4  *
   5  * Copyright (C) 2000           VA Linux Co
   6  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   7  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   8  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
  10  * Copyright (C) 2000           Hewlett-Packard Co.
  11  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  12  * Copyright (C) 2000,2001      Andi Kleen, SuSE Labs
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/gfp.h>
  17 #include <linux/fs.h>
  18 #include <linux/types.h>
  19 #include <linux/file.h>
  20 #include <linux/icmpv6.h>
  21 #include <linux/socket.h>
  22 #include <linux/syscalls.h>
  23 #include <linux/filter.h>
  24 #include <linux/compat.h>
  25 #include <linux/security.h>
  26 #include <linux/audit.h>
  27 #include <linux/export.h>
  28
  29 #include <net/scm.h>
  30 #include <net/sock.h>
  31 #include <net/ip.h>
  32 #include <net/ipv6.h>
  33 #include <linux/uaccess.h>
  34 #include <net/compat.h>
  35
  36 int __get_compat_msghdr(struct msghdr *kmsg,
  37                         struct compat_msghdr __user *umsg,
  38                         struct sockaddr __user **save_addr,
  39                         compat_uptr_t *ptr, compat_size_t *len)
  40 {
  41         struct compat_msghdr msg;
  42         ssize_t err;
  43
  44         if (copy_from_user(&msg, umsg, sizeof(*umsg)))
  45                 return -EFAULT;
  46
  47         kmsg->msg_flags = msg.msg_flags;
  48         kmsg->msg_namelen = msg.msg_namelen;
  49
  50         if (!msg.msg_name)
  51                 kmsg->msg_namelen = 0;
  52
  53         if (kmsg->msg_namelen < 0)
  54                 return -EINVAL;
  55
  56         if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
  57                 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
  58
  59         kmsg->msg_control_is_user = true;
  60         kmsg->msg_control_user = compat_ptr(msg.msg_control);
  61         kmsg->msg_controllen = msg.msg_controllen;
  62
  63         if (save_addr)
  64                 *save_addr = compat_ptr(msg.msg_name);
  65
  66         if (msg.msg_name && kmsg->msg_namelen) {
  67                 if (!save_addr) {
  68                         err = move_addr_to_kernel(compat_ptr(msg.msg_name),
  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 (msg.msg_iovlen > UIO_MAXIOV)
  80                 return -EMSGSIZE;
  81
  82         kmsg->msg_iocb = NULL;
  83         *ptr = msg.msg_iov;
  84         *len = msg.msg_iovlen;
  85         return 0;
  86 }
  87
  88 int get_compat_msghdr(struct msghdr *kmsg,
  89                       struct compat_msghdr __user *umsg,
  90                       struct sockaddr __user **save_addr,
  91                       struct iovec **iov)
  92 {
  93         compat_uptr_t ptr;
  94         compat_size_t len;
  95         ssize_t err;
  96
  97         err = __get_compat_msghdr(kmsg, umsg, save_addr, &ptr, &len);
  98         if (err)
  99                 return err;
 100
 101         err = compat_import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr),
 102                                    len, UIO_FASTIOV, iov, &kmsg->msg_iter);
 103         return err < 0 ? err : 0;
 104 }
 105
 106 /* Bleech... */
 107 #define CMSG_COMPAT_ALIGN(len)  ALIGN((len), sizeof(s32))
 108
 109 #define CMSG_COMPAT_DATA(cmsg)                          \
 110         ((void __user *)((char __user *)(cmsg) + sizeof(struct compat_cmsghdr)))
 111 #define CMSG_COMPAT_SPACE(len)                          \
 112         (sizeof(struct compat_cmsghdr) + CMSG_COMPAT_ALIGN(len))
 113 #define CMSG_COMPAT_LEN(len)                            \
 114         (sizeof(struct compat_cmsghdr) + (len))
 115
 116 #define CMSG_COMPAT_FIRSTHDR(msg)                       \
 117         (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?     \
 118          (struct compat_cmsghdr __user *)((msg)->msg_control) :         \
 119          (struct compat_cmsghdr __user *)NULL)
 120
 121 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 122         ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 123          (ucmlen) <= (unsigned long) \
 124          ((mhdr)->msg_controllen - \
 125           ((char __user *)(ucmsg) - (char __user *)(mhdr)->msg_control_user)))
 126
 127 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 128                 struct compat_cmsghdr __user *cmsg, int cmsg_len)
 129 {
 130         char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 131         if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 132                         msg->msg_controllen)
 133                 return NULL;
 134         return (struct compat_cmsghdr __user *)ptr;
 135 }
 136
 137 /* There is a lot of hair here because the alignment rules (and
 138  * thus placement) of cmsg headers and length are different for
 139  * 32-bit apps.  -DaveM
 140  */
 141 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 142                                unsigned char *stackbuf, int stackbuf_size)
 143 {
 144         struct compat_cmsghdr __user *ucmsg;
 145         struct cmsghdr *kcmsg, *kcmsg_base;
 146         compat_size_t ucmlen;
 147         __kernel_size_t kcmlen, tmp;
 148         int err = -EFAULT;
 149
 150         BUILD_BUG_ON(sizeof(struct compat_cmsghdr) !=
 151                      CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)));
 152
 153         kcmlen = 0;
 154         kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 155         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 156         while (ucmsg != NULL) {
 157                 if (get_user(ucmlen, &ucmsg->cmsg_len))
 158                         return -EFAULT;
 159
 160                 /* Catch bogons. */
 161                 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 162                         return -EINVAL;
 163
 164                 tmp = ((ucmlen - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 165                 tmp = CMSG_ALIGN(tmp);
 166                 kcmlen += tmp;
 167                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 168         }
 169         if (kcmlen == 0)
 170                 return -EINVAL;
 171
 172         /* The kcmlen holds the 64-bit version of the control length.
 173          * It may not be modified as we do not stick it into the kmsg
 174          * until we have successfully copied over all of the data
 175          * from the user.
 176          */
 177         if (kcmlen > stackbuf_size)
 178                 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 179         if (kcmsg == NULL)
 180                 return -ENOBUFS;
 181
 182         /* Now copy them over neatly. */
 183         memset(kcmsg, 0, kcmlen);
 184         ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 185         while (ucmsg != NULL) {
 186                 struct compat_cmsghdr cmsg;
 187                 if (copy_from_user(&cmsg, ucmsg, sizeof(cmsg)))
 188                         goto Efault;
 189                 if (!CMSG_COMPAT_OK(cmsg.cmsg_len, ucmsg, kmsg))
 190                         goto Einval;
 191                 tmp = ((cmsg.cmsg_len - sizeof(*ucmsg)) + sizeof(struct cmsghdr));
 192                 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 193                         goto Einval;
 194                 kcmsg->cmsg_len = tmp;
 195                 kcmsg->cmsg_level = cmsg.cmsg_level;
 196                 kcmsg->cmsg_type = cmsg.cmsg_type;
 197                 tmp = CMSG_ALIGN(tmp);
 198                 if (copy_from_user(CMSG_DATA(kcmsg),
 199                                    CMSG_COMPAT_DATA(ucmsg),
 200                                    (cmsg.cmsg_len - sizeof(*ucmsg))))
 201                         goto Efault;
 202
 203                 /* Advance. */
 204                 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 205                 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, cmsg.cmsg_len);
 206         }
 207
 208         /*
 209          * check the length of messages copied in is the same as the
 210          * what we get from the first loop
 211          */
 212         if ((char *)kcmsg - (char *)kcmsg_base != kcmlen)
 213                 goto Einval;
 214
 215         /* Ok, looks like we made it.  Hook it up and return success. */
 216         kmsg->msg_control = kcmsg_base;
 217         kmsg->msg_controllen = kcmlen;
 218         return 0;
 219
 220 Einval:
 221         err = -EINVAL;
 222 Efault:
 223         if (kcmsg_base != (struct cmsghdr *)stackbuf)
 224                 sock_kfree_s(sk, kcmsg_base, kcmlen);
 225         return err;
 226 }
 227
 228 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 229 {
 230         struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 231         struct compat_cmsghdr cmhdr;
 232         struct old_timeval32 ctv;
 233         struct old_timespec32 cts[3];
 234         int cmlen;
 235
 236         if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 237                 kmsg->msg_flags |= MSG_CTRUNC;
 238                 return 0; /* XXX: return error? check spec. */
 239         }
 240
 241         if (!COMPAT_USE_64BIT_TIME) {
 242                 if (level == SOL_SOCKET && type == SO_TIMESTAMP_OLD) {
 243                         struct __kernel_old_timeval *tv = (struct __kernel_old_timeval *)data;
 244                         ctv.tv_sec = tv->tv_sec;
 245                         ctv.tv_usec = tv->tv_usec;
 246                         data = &ctv;
 247                         len = sizeof(ctv);
 248                 }
 249                 if (level == SOL_SOCKET &&
 250                     (type == SO_TIMESTAMPNS_OLD || type == SO_TIMESTAMPING_OLD)) {
 251                         int count = type == SO_TIMESTAMPNS_OLD ? 1 : 3;
 252                         int i;
 253                         struct __kernel_old_timespec *ts = data;
 254                         for (i = 0; i < count; i++) {
 255                                 cts[i].tv_sec = ts[i].tv_sec;
 256                                 cts[i].tv_nsec = ts[i].tv_nsec;
 257                         }
 258                         data = &cts;
 259                         len = sizeof(cts[0]) * count;
 260                 }
 261         }
 262
 263         cmlen = CMSG_COMPAT_LEN(len);
 264         if (kmsg->msg_controllen < cmlen) {
 265                 kmsg->msg_flags |= MSG_CTRUNC;
 266                 cmlen = kmsg->msg_controllen;
 267         }
 268         cmhdr.cmsg_level = level;
 269         cmhdr.cmsg_type = type;
 270         cmhdr.cmsg_len = cmlen;
 271
 272         if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
 273                 return -EFAULT;
 274         if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 275                 return -EFAULT;
 276         cmlen = CMSG_COMPAT_SPACE(len);
 277         if (kmsg->msg_controllen < cmlen)
 278                 cmlen = kmsg->msg_controllen;
 279         kmsg->msg_control += cmlen;
 280         kmsg->msg_controllen -= cmlen;
 281         return 0;
 282 }
 283
 284 static int scm_max_fds_compat(struct msghdr *msg)
 285 {
 286         if (msg->msg_controllen <= sizeof(struct compat_cmsghdr))
 287                 return 0;
 288         return (msg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 289 }
 290
 291 void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm)
 292 {
 293         struct compat_cmsghdr __user *cm =
 294                 (struct compat_cmsghdr __user *)msg->msg_control;
 295         unsigned int o_flags = (msg->msg_flags & MSG_CMSG_CLOEXEC) ? O_CLOEXEC : 0;
 296         int fdmax = min_t(int, scm_max_fds_compat(msg), scm->fp->count);
 297         int __user *cmsg_data = CMSG_USER_DATA(cm);
 298         int err = 0, i;
 299
 300         for (i = 0; i < fdmax; i++) {
 301                 err = receive_fd_user(scm->fp->fp[i], cmsg_data + i, o_flags);
 302                 if (err < 0)
 303                         break;
 304         }
 305
 306         if (i > 0) {
 307                 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 308
 309                 err = put_user(SOL_SOCKET, &cm->cmsg_level);
 310                 if (!err)
 311                         err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 312                 if (!err)
 313                         err = put_user(cmlen, &cm->cmsg_len);
 314                 if (!err) {
 315                         cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 316                         if (msg->msg_controllen < cmlen)
 317                                 cmlen = msg->msg_controllen;
 318                         msg->msg_control += cmlen;
 319                         msg->msg_controllen -= cmlen;
 320                 }
 321         }
 322
 323         if (i < scm->fp->count || (scm->fp->count && fdmax <= 0))
 324                 msg->msg_flags |= MSG_CTRUNC;
 325
 326         /*
 327          * All of the files that fit in the message have had their usage counts
 328          * incremented, so we just free the list.
 329          */
 330         __scm_destroy(scm);
 331 }
 332
 333 /* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */
 334 struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval)
 335 {
 336         struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 337         struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 338         struct compat_sock_fprog f32;
 339         struct sock_fprog f;
 340
 341         if (copy_from_user(&f32, fprog32, sizeof(*fprog32)))
 342                 return NULL;
 343         memset(&f, 0, sizeof(f));
 344         f.len = f32.len;
 345         f.filter = compat_ptr(f32.filter);
 346         if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog)))
 347                 return NULL;
 348
 349         return kfprog;
 350 }
 351 EXPORT_SYMBOL_GPL(get_compat_bpf_fprog);
 352
 353 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 354                                 char __user *optval, unsigned int optlen)
 355 {
 356         struct sock_fprog __user *kfprog;
 357
 358         kfprog = get_compat_bpf_fprog(optval);
 359         if (!kfprog)
 360                 return -EFAULT;
 361
 362         return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 363                               sizeof(struct sock_fprog));
 364 }
 365
 366 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 367                                 char __user *optval, unsigned int optlen)
 368 {
 369         if (optname == SO_ATTACH_FILTER ||
 370             optname == SO_ATTACH_REUSEPORT_CBPF)
 371                 return do_set_attach_filter(sock, level, optname,
 372                                             optval, optlen);
 373         return sock_setsockopt(sock, level, optname, optval, optlen);
 374 }
 375
 376 static int __compat_sys_setsockopt(int fd, int level, int optname,
 377                                    char __user *optval, unsigned int optlen)
 378 {
 379         int err;
 380         struct socket *sock;
 381
 382         if (optlen > INT_MAX)
 383                 return -EINVAL;
 384
 385         sock = sockfd_lookup(fd, &err);
 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
 407 COMPAT_SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname,
 408                        char __user *, optval, unsigned int, optlen)
 409 {
 410         return __compat_sys_setsockopt(fd, level, optname, optval, optlen);
 411 }
 412
 413 static int __compat_sys_getsockopt(int fd, int level, int optname,
 414                                    char __user *optval,
 415                                    int __user *optlen)
 416 {
 417         int err;
 418         struct socket *sock = sockfd_lookup(fd, &err);
 419
 420         if (sock) {
 421                 err = security_socket_getsockopt(sock, level, optname);
 422                 if (err) {
 423                         sockfd_put(sock);
 424                         return err;
 425                 }
 426
 427                 if (level == SOL_SOCKET)
 428                         err = sock_getsockopt(sock, level,
 429                                         optname, optval, optlen);
 430                 else if (sock->ops->compat_getsockopt)
 431                         err = sock->ops->compat_getsockopt(sock, level,
 432                                         optname, optval, optlen);
 433                 else
 434                         err = sock->ops->getsockopt(sock, level,
 435                                         optname, optval, optlen);
 436                 sockfd_put(sock);
 437         }
 438         return err;
 439 }
 440
 441 COMPAT_SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
 442                        char __user *, optval, int __user *, optlen)
 443 {
 444         return __compat_sys_getsockopt(fd, level, optname, optval, optlen);
 445 }
 446
 447 /* Argument list sizes for compat_sys_socketcall */
 448 #define AL(x) ((x) * sizeof(u32))
 449 static unsigned char nas[21] = {
 450         AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
 451         AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
 452         AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
 453         AL(4), AL(5), AL(4)
 454 };
 455 #undef AL
 456
 457 static inline long __compat_sys_sendmsg(int fd,
 458                                         struct compat_msghdr __user *msg,
 459                                         unsigned int flags)
 460 {
 461         return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
 462                              flags | MSG_CMSG_COMPAT, false);
 463 }
 464
 465 COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
 466                        unsigned int, flags)
 467 {
 468         return __compat_sys_sendmsg(fd, msg, flags);
 469 }
 470
 471 static inline long __compat_sys_sendmmsg(int fd,
 472                                          struct compat_mmsghdr __user *mmsg,
 473                                          unsigned int vlen, unsigned int flags)
 474 {
 475         return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 476                               flags | MSG_CMSG_COMPAT, false);
 477 }
 478
 479 COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
 480                        unsigned int, vlen, unsigned int, flags)
 481 {
 482         return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
 483 }
 484
 485 static inline long __compat_sys_recvmsg(int fd,
 486                                         struct compat_msghdr __user *msg,
 487                                         unsigned int flags)
 488 {
 489         return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
 490                              flags | MSG_CMSG_COMPAT, false);
 491 }
 492
 493 COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
 494                        unsigned int, flags)
 495 {
 496         return __compat_sys_recvmsg(fd, msg, flags);
 497 }
 498
 499 static inline long __compat_sys_recvfrom(int fd, void __user *buf,
 500                                          compat_size_t len, unsigned int flags,
 501                                          struct sockaddr __user *addr,
 502                                          int __user *addrlen)
 503 {
 504         return __sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr,
 505                               addrlen);
 506 }
 507
 508 COMPAT_SYSCALL_DEFINE4(recv, int, fd, void __user *, buf, compat_size_t, len, unsigned int, flags)
 509 {
 510         return __compat_sys_recvfrom(fd, buf, len, flags, NULL, NULL);
 511 }
 512
 513 COMPAT_SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, buf, compat_size_t, len,
 514                        unsigned int, flags, struct sockaddr __user *, addr,
 515                        int __user *, addrlen)
 516 {
 517         return __compat_sys_recvfrom(fd, buf, len, flags, addr, addrlen);
 518 }
 519
 520 COMPAT_SYSCALL_DEFINE5(recvmmsg_time64, int, fd, struct compat_mmsghdr __user *, mmsg,
 521                        unsigned int, vlen, unsigned int, flags,
 522                        struct __kernel_timespec __user *, timeout)
 523 {
 524         return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 525                               flags | MSG_CMSG_COMPAT, timeout, NULL);
 526 }
 527
 528 #ifdef CONFIG_COMPAT_32BIT_TIME
 529 COMPAT_SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct compat_mmsghdr __user *, mmsg,
 530                        unsigned int, vlen, unsigned int, flags,
 531                        struct old_timespec32 __user *, timeout)
 532 {
 533         return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
 534                               flags | MSG_CMSG_COMPAT, NULL, timeout);
 535 }
 536 #endif
 537
 538 COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 539 {
 540         u32 a[AUDITSC_ARGS];
 541         unsigned int len;
 542         u32 a0, a1;
 543         int ret;
 544
 545         if (call < SYS_SOCKET || call > SYS_SENDMMSG)
 546                 return -EINVAL;
 547         len = nas[call];
 548         if (len > sizeof(a))
 549                 return -EINVAL;
 550
 551         if (copy_from_user(a, args, len))
 552                 return -EFAULT;
 553
 554         ret = audit_socketcall_compat(len / sizeof(a[0]), a);
 555         if (ret)
 556                 return ret;
 557
 558         a0 = a[0];
 559         a1 = a[1];
 560
 561         switch (call) {
 562         case SYS_SOCKET:
 563                 ret = __sys_socket(a0, a1, a[2]);
 564                 break;
 565         case SYS_BIND:
 566                 ret = __sys_bind(a0, compat_ptr(a1), a[2]);
 567                 break;
 568         case SYS_CONNECT:
 569                 ret = __sys_connect(a0, compat_ptr(a1), a[2]);
 570                 break;
 571         case SYS_LISTEN:
 572                 ret = __sys_listen(a0, a1);
 573                 break;
 574         case SYS_ACCEPT:
 575                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
 576                 break;
 577         case SYS_GETSOCKNAME:
 578                 ret = __sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 579                 break;
 580         case SYS_GETPEERNAME:
 581                 ret = __sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 582                 break;
 583         case SYS_SOCKETPAIR:
 584                 ret = __sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 585                 break;
 586         case SYS_SEND:
 587                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3], NULL, 0);
 588                 break;
 589         case SYS_SENDTO:
 590                 ret = __sys_sendto(a0, compat_ptr(a1), a[2], a[3],
 591                                    compat_ptr(a[4]), a[5]);
 592                 break;
 593         case SYS_RECV:
 594                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 595                                             NULL, NULL);
 596                 break;
 597         case SYS_RECVFROM:
 598                 ret = __compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
 599                                             compat_ptr(a[4]),
 600                                             compat_ptr(a[5]));
 601                 break;
 602         case SYS_SHUTDOWN:
 603                 ret = __sys_shutdown(a0, a1);
 604                 break;
 605         case SYS_SETSOCKOPT:
 606                 ret = __compat_sys_setsockopt(a0, a1, a[2],
 607                                               compat_ptr(a[3]), a[4]);
 608                 break;
 609         case SYS_GETSOCKOPT:
 610                 ret = __compat_sys_getsockopt(a0, a1, a[2],
 611                                               compat_ptr(a[3]),
 612                                               compat_ptr(a[4]));
 613                 break;
 614         case SYS_SENDMSG:
 615                 ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 616                 break;
 617         case SYS_SENDMMSG:
 618                 ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
 619                 break;
 620         case SYS_RECVMSG:
 621                 ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 622                 break;
 623         case SYS_RECVMMSG:
 624                 ret = __sys_recvmmsg(a0, compat_ptr(a1), a[2],
 625                                      a[3] | MSG_CMSG_COMPAT, NULL,
 626                                      compat_ptr(a[4]));
 627                 break;
 628         case SYS_ACCEPT4:
 629                 ret = __sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
 630                 break;
 631         default:
 632                 ret = -EINVAL;
 633                 break;
 634         }
 635         return ret;
 636 }