/*      $NetBSD: linux_socketcall.c,v 1.49 2021/09/23 06:56:27 ryo Exp $        */

/*-
* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Eric Haszlakiewicz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_socketcall.c,v 1.49 2021/09/23 06:56:27 ryo Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/device.h>
#include <sys/ktrace.h>

#include <sys/syscallargs.h>

#include <compat/sys/socket.h>

#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_ioctl.h>
#include <compat/linux/common/linux_socket.h>
#include <compat/linux/common/linux_socketcall.h>
#include <compat/linux/common/linux_sockio.h>

#include <compat/linux/linux_syscallargs.h>

#undef DPRINTF
#ifdef DEBUG_LINUX
#define DPRINTF(a)      uprintf a
#else
#define DPRINTF(a)
#endif

/* Used on: arm, i386, m68k, mips, ppc, sparc, sparc64 */
/* Not used on: aarch64, alpha, amd64 */

/*
* This file contains the linux_socketcall() multiplexer.  Arguments
* for the various socket calls are on the user stack. A pointer
* to them is the only thing that is passed.  We copyin the arguments
* here so the individual functions can assume they are normal syscalls.
*/

/* The sizes of the arguments.  Used for copyin. */
static const struct {
       const char *name;
       int argsize;
} linux_socketcall[LINUX_MAX_SOCKETCALL+1] = {
#define L(a) "linux/" a
       {L("invalid"),  -1},                                            /* 0 */
       {L("socket"),   sizeof(struct linux_sys_socket_args)},          /* 1 */
       {L("bind"),     sizeof(struct linux_sys_bind_args)},            /* 2 */
       {L("connect"),  sizeof(struct linux_sys_connect_args)},         /* 3 */
       {L("listen"),   sizeof(struct sys_listen_args)},                /* 4 */
       {L("accept"),   sizeof(struct linux_sys_accept_args)},          /* 5 */
       {L("getsockname"),sizeof(struct linux_sys_getsockname_args)},   /* 6 */
       {L("getpeername"),sizeof(struct linux_sys_getpeername_args)},   /* 7 */
       {L("socketpair"),sizeof(struct linux_sys_socketpair_args)},     /* 8 */
       {L("send"),     sizeof(struct linux_sys_send_args)},            /* 9 */
       {L("recv"),     sizeof(struct linux_sys_recv_args)},            /* 10 */
       {L("sendto"),   sizeof(struct linux_sys_sendto_args)},          /* 11 */
       {L("recvfrom"), sizeof(struct linux_sys_recvfrom_args)},        /* 12 */
       {L("shutdown"), sizeof(struct sys_shutdown_args)},              /* 13 */
       {L("setsockopt"),sizeof(struct linux_sys_setsockopt_args)},     /* 14 */
       {L("getsockopt"),sizeof(struct linux_sys_getsockopt_args)},     /* 15 */
       {L("sendmsg"),  sizeof(struct linux_sys_sendmsg_args)},         /* 16 */
       {L("recvmsg"),  sizeof(struct linux_sys_recvmsg_args)},         /* 17 */
       {L("accept4"),  sizeof(struct linux_sys_accept4_args)},         /* 18 */
#undef L
};

/*
* Entry point to all Linux socket calls. Just check which call to
* make and take appropriate action.
*/
int
linux_sys_socketcall(struct lwp *l, const struct linux_sys_socketcall_args *uap, register_t *retval)
{
       /* {
               syscallarg(int) what;
               syscallarg(void *) args;
       } */
       struct linux_socketcall_dummy_args lda;
       int error;

       if (SCARG(uap, what) <= 0 || SCARG(uap, what) > LINUX_MAX_SOCKETCALL)
               return ENOSYS;

       if ((error = copyin(SCARG(uap, args), &lda,
           linux_socketcall[SCARG(uap, what)].argsize))) {
               DPRINTF(("copyin for %s failed %d\n",
               linux_socketcall[SCARG(uap, what)].name, error));
               return error;
       }

       ktrkuser(linux_socketcall[SCARG(uap, what)].name, &lda,
           linux_socketcall[SCARG(uap, what)].argsize);

#ifdef DEBUG_LINUX
       /* dump the passed argument data */
       {
               DPRINTF(("linux_socketcall('%s'): ",
                   linux_socketcall[SCARG(uap, what)].name));

               if (SCARG(uap, what) == LINUX_SYS_SOCKET) {
                       DPRINTF(("[dom %d type %d proto %d]\n",
                               lda.dummy_ints[0],
                               lda.dummy_ints[1],
                               lda.dummy_ints[2]));
               } else {
                       int i, sz;
                       u_int8_t *data = (u_int8_t *)&lda.dummy_ints[1];

                       sz = linux_socketcall[SCARG(uap, what)].argsize
                           - sizeof(lda.dummy_ints[0]);

                       DPRINTF(("socket %d [", lda.dummy_ints[0]));
                       for(i=0; i < sz; i++)
                               DPRINTF(("%02x ", data[i]));
                       DPRINTF(("]\n"));
               }
       }
#endif

       switch (SCARG(uap, what)) {
       case LINUX_SYS_SOCKET:
               error = linux_sys_socket(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_BIND:
               error = linux_sys_bind(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_CONNECT:
               error = linux_sys_connect(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_LISTEN:
               error = sys_listen(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_ACCEPT:
               error = linux_sys_accept(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_GETSOCKNAME:
               error = linux_sys_getsockname(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_GETPEERNAME:
               error = linux_sys_getpeername(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_SOCKETPAIR:
               error = linux_sys_socketpair(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_SEND:
               error = linux_sys_send(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_RECV:
               error = linux_sys_recv(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_SENDTO:
               error = linux_sys_sendto(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_RECVFROM:
               error = linux_sys_recvfrom(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_SHUTDOWN:
               error = sys_shutdown(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_SETSOCKOPT:
               error = linux_sys_setsockopt(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_GETSOCKOPT:
               error = linux_sys_getsockopt(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_SENDMSG:
               error = linux_sys_sendmsg(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_RECVMSG:
               error = linux_sys_recvmsg(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_ACCEPT4:
               error = linux_sys_accept4(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_RECVMMSG:
               error = linux_sys_recvmmsg(l, (void *)&lda, retval);
               break;
       case LINUX_SYS_SENDMMSG:
               error = linux_sys_sendmmsg(l, (void *)&lda, retval);
               break;
       default:
               error = ENOSYS;
               break;
       }

       DPRINTF(("sys_%s() = %d\n", linux_socketcall[SCARG(uap, what)].name,
           error));
       return error;
}

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