NetBSD/sys/compat/netbsd32/netbsd32_sysctl.c

/*	$NetBSD: netbsd32_sysctl.c,v 1.45 2021/01/19 03:20:13 simonb Exp $	*/

/*
 * Copyright (c) 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Andrew Brown.
 *
 * 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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: netbsd32_sysctl.c,v 1.45 2021/01/19 03:20:13 simonb Exp $");

#if defined(_KERNEL_OPT)
#include "opt_ddb.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <sys/syscallargs.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/dirent.h>
#include <sys/ktrace.h>

#include <uvm/uvm_extern.h>

#include <compat/netbsd32/netbsd32.h>
#include <compat/netbsd32/netbsd32_syscall.h>
#include <compat/netbsd32/netbsd32_syscallargs.h>
#include <compat/netbsd32/netbsd32_conv.h>
#include <compat/netbsd32/netbsd32_sysctl.h>

#if defined(DDB)
#include <ddb/ddbvar.h>
#endif

struct sysctlnode netbsd32_sysctl_root = {
	.sysctl_flags = SYSCTL_VERSION|CTLFLAG_ROOT|CTLTYPE_NODE,
	.sysctl_num = 0,
	.sysctl_name = "(netbsd32_root)",
	.sysctl_size = sizeof(struct sysctlnode),
};

/*
 * sysctl helper routine for netbsd32's kern.boottime node
 */
static int
netbsd32_sysctl_kern_boottime(SYSCTLFN_ARGS)
{
	struct sysctlnode node;
	struct netbsd32_timespec bt32;
	struct timespec ts;

	getnanoboottime(&ts);
	netbsd32_from_timespec(&ts, &bt32);

	node = *rnode;
	node.sysctl_data = &bt32;
	return sysctl_lookup(SYSCTLFN_CALL(&node));
}

/*
 * sysctl helper routine for netbsd32's vm.loadavg node
 */
static int
netbsd32_sysctl_vm_loadavg(SYSCTLFN_ARGS)
{
	struct sysctlnode node;
	struct netbsd32_loadavg av32;

	netbsd32_from_loadavg(&av32, &averunnable);

	node = *rnode;
	node.sysctl_data = &av32;
	return sysctl_lookup(SYSCTLFN_CALL(&node));
}

static int
sysctl_hw_machine_arch32(SYSCTLFN_ARGS)
{
	struct sysctlnode node = *rnode;
#ifndef PROC_MACHINE_ARCH32
	extern const char machine_arch32[];
#define PROC_MACHINE_ARCH32(P)	__UNCONST(machine_arch32)
#endif

	node.sysctl_data = PROC_MACHINE_ARCH32(l->l_proc);
	node.sysctl_size = strlen(node.sysctl_data) + 1;
	return sysctl_lookup(SYSCTLFN_CALL(&node));
}

SYSCTL_SETUP(netbsd32_sysctl_emul_setup, "netbsd32 shadow tree")
{
	const struct sysctlnode *_root = &netbsd32_sysctl_root;
	extern const char machine32[];

	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "kern", NULL,
		       NULL, 0, NULL, 0,
		       CTL_KERN, CTL_EOL);
	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_STRUCT, "boottime", NULL,
		       netbsd32_sysctl_kern_boottime, 0, NULL,
		       sizeof(struct netbsd32_timeval),
		       CTL_KERN, KERN_BOOTTIME, CTL_EOL);

	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "vm", NULL,
		       NULL, 0, NULL, 0,
		       CTL_VM, CTL_EOL);
	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_STRUCT, "loadavg", NULL,
		       netbsd32_sysctl_vm_loadavg, 0, NULL,
		       sizeof(struct netbsd32_loadavg),
		       CTL_VM, VM_LOADAVG, CTL_EOL);
	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
		       CTLTYPE_INT, "maxaddress",
		       SYSCTL_DESCR("Maximum user address"),
		       NULL, VM_MAXUSER_ADDRESS32, NULL, 0,
		       CTL_VM, VM_MAXADDRESS, CTL_EOL);
	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
		       CTLTYPE_INT, "minaddress",
		       SYSCTL_DESCR("Minimum user address"),
		       NULL, VM_MIN_ADDRESS, NULL, 0,
		       CTL_VM, VM_MINADDRESS, CTL_EOL);

	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "hw", NULL,
		       NULL, 0, NULL, 0,
		       CTL_HW, CTL_EOL);
	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
		       CTLTYPE_INT, "alignbytes", NULL,
		       NULL, ALIGNBYTES32, NULL, 0,
		       CTL_HW, HW_ALIGNBYTES, CTL_EOL);
	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_STRING, "machine", NULL,
		       NULL, 0, __UNCONST(&machine32), 0,
		       CTL_HW, HW_MACHINE, CTL_EOL);
	sysctl_createv(clog, 0, &_root, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READONLY,
		       CTLTYPE_STRING, "machine_arch", NULL,
		       sysctl_hw_machine_arch32, 0, NULL, 0,
		       CTL_HW, HW_MACHINE_ARCH, CTL_EOL);
}

void
netbsd32_sysctl_fini(void)
{

	sysctl_free(&netbsd32_sysctl_root);
}

int
netbsd32___sysctl(struct lwp *l, const struct netbsd32___sysctl_args *uap, register_t *retval)
{
	/* {
		syscallarg(netbsd32_intp) name;
		syscallarg(u_int) namelen;
		syscallarg(netbsd32_voidp) old;
		syscallarg(netbsd32_size_tp) oldlenp;
		syscallarg(netbsd32_voidp) new;
		syscallarg(netbsd32_size_t) newlen;
	} */
	const struct sysctlnode *pnode;
	netbsd32_size_t netbsd32_oldlen;
	size_t oldlen, *oldlenp, savelen;
	int name[CTL_MAXNAME], error, nerror, *namep;
	void *newp, *oldp;

	/*
	 * get and convert 32 bit size_t to native size_t
	 */
	namep = SCARG_P32(uap, name);
	oldp = SCARG_P32(uap, oldv);
	newp = SCARG_P32(uap, newv);
	oldlenp = SCARG_P32(uap, oldlenp);
	oldlen = 0;
	if (oldlenp != NULL) {
		error = copyin(oldlenp, &netbsd32_oldlen,
			       sizeof(netbsd32_oldlen));
		if (error)
			return error;
		oldlen = netbsd32_oldlen;
	}
	savelen = oldlen;

	/*
	 * retrieve name and see if we need to dispatch this query to
	 * the shadow tree.  if we find it in the shadow tree,
	 * dispatch to there, otherwise NULL means use the built-in
	 * default main tree.
	 */
	if (SCARG(uap, namelen) > CTL_MAXNAME || SCARG(uap, namelen) < 1)
		return EINVAL;
	error = copyin(namep, &name[0], SCARG(uap, namelen) * sizeof(int));
        if (error)
                return error;

	ktrmib(name, SCARG(uap, namelen));

	sysctl_lock(newp != NULL);
	pnode = &netbsd32_sysctl_root;
	error = sysctl_locate(l, &name[0], SCARG(uap, namelen), &pnode, NULL);
	pnode = (error == 0) ? &netbsd32_sysctl_root : NULL;
	error = sysctl_dispatch(&name[0], SCARG(uap, namelen),
				oldp, &oldlen,
				newp, SCARG(uap, newlen),
				&name[0], l, pnode);
	sysctl_unlock();

	/*
	 * reset caller's oldlen, even if we got an error
	 */
	if (oldlenp) {
		netbsd32_oldlen = oldlen;
                nerror = copyout(&netbsd32_oldlen, oldlenp,
				 sizeof(netbsd32_oldlen));
                if (error == 0)
                        error = nerror;
	}

	/*
	 * if the only problem is that we weren't given enough space,
	 * that's an ENOMEM error
	 */
	if (error == 0 && oldp != NULL && savelen < oldlen)
		error = ENOMEM;

	return error;
}