/* $NetBSD: sysv_ipc_50.c,v 1.6 2019/01/27 02:08:39 pgoyette Exp $ */

/* $NetBSD: sysv_ipc_50.c,v 1.6 2019/01/27 02:08:39 pgoyette Exp $ */

/*-
* Copyright (c) 1998, 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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: sysv_ipc_50.c,v 1.6 2019/01/27 02:08:39 pgoyette Exp $");

#ifdef _KERNEL_OPT
#include "opt_sysv.h"
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/ipc.h>
#ifdef SYSVMSG
#include <sys/msg.h>
#endif
#ifdef SYSVSEM
#include <sys/sem.h>
#endif
#ifdef SYSVSHM
#include <sys/shm.h>
#endif
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/kauth.h>

#include <compat/sys/ipc.h>
#ifdef SYSVMSG
#include <compat/sys/msg.h>
#endif
#ifdef SYSVSEM
#include <compat/sys/sem.h>
#endif
#ifdef SYSVSHM
#include <compat/sys/shm.h>
#endif

/*
* Check for ipc permission
*/

int
sysctl_kern_sysvipc50(SYSCTLFN_ARGS)
{
void *where = oldp;
size_t *sizep = oldlenp;
#ifdef SYSVMSG
struct msg_sysctl_info50 *msgsi = NULL;
#endif
#ifdef SYSVSEM
struct sem_sysctl_info50 *semsi = NULL;
#endif
#ifdef SYSVSHM
struct shm_sysctl_info50 *shmsi = NULL;
#endif
size_t infosize, dssize, tsize, buflen;
void *bf = NULL;
char *start;
int32_t nds;
int i, error, ret;

if (namelen != 1)
return EINVAL;

start = where;
buflen = *sizep;

switch (*name) {
case KERN_SYSVIPC_OMSG_INFO:
#ifdef SYSVMSG
infosize = sizeof(msgsi->msginfo);
nds = msginfo.msgmni;
dssize = sizeof(msgsi->msgids[0]);
break;
#else
return EINVAL;
#endif
case KERN_SYSVIPC_OSEM_INFO:
#ifdef SYSVSEM
infosize = sizeof(semsi->seminfo);
nds = seminfo.semmni;
dssize = sizeof(semsi->semids[0]);
break;
#else
return EINVAL;
#endif
case KERN_SYSVIPC_OSHM_INFO:
#ifdef SYSVSHM
infosize = sizeof(shmsi->shminfo);
nds = shminfo.shmmni;
dssize = sizeof(shmsi->shmids[0]);
break;
#else
return EINVAL;
#endif
default:
return EPASSTHROUGH;
}
/*
* Round infosize to 64 bit boundary if requesting more than just
* the info structure or getting the total data size.
*/
if (where == NULL || *sizep > infosize)
infosize = roundup(infosize, sizeof(quad_t));
tsize = infosize + nds * dssize;

/* Return just the total size required. */
if (where == NULL) {
*sizep = tsize;
return 0;
}

/* Not enough room for even the info struct. */
if (buflen < infosize) {
*sizep = 0;
return ENOMEM;
}
bf = malloc(uimin(tsize, buflen), M_TEMP, M_WAITOK | M_ZERO);

switch (*name) {
#ifdef SYSVMSG
case KERN_SYSVIPC_OMSG_INFO:
msgsi = (struct msg_sysctl_info50 *)bf;
msgsi->msginfo = msginfo;
break;
#endif
#ifdef SYSVSEM
case KERN_SYSVIPC_OSEM_INFO:
semsi = (struct sem_sysctl_info50 *)bf;
semsi->seminfo = seminfo;
break;
#endif
#ifdef SYSVSHM
case KERN_SYSVIPC_OSHM_INFO:
shmsi = (struct shm_sysctl_info50 *)bf;
shmsi->shminfo = shminfo;
break;
#endif
}
buflen -= infosize;

ret = 0;
if (buflen > 0) {
/* Fill in the IPC data structures. */
for (i = 0; i < nds; i++) {
if (buflen < dssize) {
ret = ENOMEM;
break;
}
switch (*name) {
#ifdef SYSVMSG
case KERN_SYSVIPC_OMSG_INFO:
mutex_enter(&msgmutex);
SYSCTL_FILL_MSG(msqs[i].msq_u, msgsi->msgids[i]);
mutex_exit(&msgmutex);
break;
#endif
#ifdef SYSVSEM
case KERN_SYSVIPC_OSEM_INFO:
SYSCTL_FILL_SEM(sema[i], semsi->semids[i]);
break;
#endif
#ifdef SYSVSHM
case KERN_SYSVIPC_OSHM_INFO:
SYSCTL_FILL_SHM(shmsegs[i], shmsi->shmids[i]);
break;
#endif
}
buflen -= dssize;
}
}
*sizep -= buflen;
error = copyout(bf, start, *sizep);
/* If copyout succeeded, use return code set earlier. */
if (error == 0)
error = ret;
if (bf)
free(bf, M_TEMP);
return error;
}