/*      $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;
}