/*	$NetBSD: if_43.c,v 1.26.4.1 2023/07/31 16:37:18 martin Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1989, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)uipc_syscalls.c	8.4 (Berkeley) 2/21/94
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_43.c,v 1.26.4.1 2023/07/31 16:37:18 martin Exp $");

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

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/syslog.h>
#include <sys/unistd.h>
#include <sys/resourcevar.h>
#include <sys/mbuf.h>		/* for MLEN */
#include <sys/protosw.h>
#include <sys/compat_stub.h>

#include <sys/syscallargs.h>

#include <net/if.h>
#include <net/bpf.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <net/if_gre.h>
#include <net/if_tap.h>
#include <net80211/ieee80211_ioctl.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#include <compat/net/if.h>
#include <compat/sys/socket.h>
#include <compat/sys/sockio.h>

#include <compat/common/compat_util.h>
#include <compat/common/compat_mod.h>
#include <uvm/uvm_extern.h>

#if defined(COMPAT_43)

/* 
 * Use a wrapper so that the compat_cvtcmd() can return a u_long
 */
static int 
do_compat_cvtcmd(u_long *ncmd, u_long ocmd)
{ 

	*ncmd = compat_cvtcmd(ocmd);
	return 0;
}

u_long
compat_cvtcmd(u_long cmd)
{
	u_long ncmd;

	if (IOCPARM_LEN(cmd) != sizeof(struct oifreq))
		return cmd;

	switch (cmd) {
	case OSIOCSIFADDR:
		return SIOCSIFADDR;
	case OOSIOCGIFADDR:
		return SIOCGIFADDR;
	case OSIOCSIFDSTADDR:
		return SIOCSIFDSTADDR;
	case OOSIOCGIFDSTADDR:
		return SIOCGIFDSTADDR;
	case OSIOCSIFFLAGS:
		return SIOCSIFFLAGS;
	case OSIOCGIFFLAGS:
		return SIOCGIFFLAGS;
	case OOSIOCGIFBRDADDR:
		return SIOCGIFBRDADDR;
	case OSIOCSIFBRDADDR:
		return SIOCSIFBRDADDR;
	case OOSIOCGIFCONF:
		return SIOCGIFCONF;
	case OOSIOCGIFNETMASK:
		return SIOCGIFNETMASK;
	case OSIOCSIFNETMASK:
		return SIOCSIFNETMASK;
	case OSIOCGIFCONF:
		return SIOCGIFCONF;
	case OSIOCADDMULTI:
		return SIOCADDMULTI;
	case OSIOCDELMULTI:
		return SIOCDELMULTI;
	case SIOCSIFMEDIA_43:
		return SIOCSIFMEDIA_80;
	case OSIOCGIFMTU:
		return SIOCGIFMTU;
	case OSIOCGIFDATA:
		return SIOCGIFDATA;
	case OSIOCZIFDATA:
		return SIOCZIFDATA;
	case OBIOCGETIF:
		return BIOCGETIF;
	case OBIOCSETIF:
		return BIOCSETIF;
	case OTAPGIFNAME:
		return TAPGIFNAME;
	default:
		/*
		 * XXX: the following code should be removed and the
		 * needing treatment ioctls should move to the switch
		 * above.
		 */
		ncmd = ((cmd) & ~(IOCPARM_MASK << IOCPARM_SHIFT)) | 
		    (sizeof(struct ifreq) << IOCPARM_SHIFT);
		switch (ncmd) {
		case BIOCGETIF:
		case BIOCSETIF:
		case GREDSOCK:
		case GREGADDRD:
		case GREGADDRS:
		case GREGPROTO:
		case GRESADDRD:
		case GRESADDRS:
		case GRESPROTO:
		case GRESSOCK:
		case SIOCADDMULTI:
		case SIOCDELMULTI:
		case SIOCDIFADDR:
		case SIOCDIFADDR_IN6:
		case SIOCDIFPHYADDR:
		case SIOCG80211NWID:
		case SIOCG80211STATS:
		case SIOCG80211ZSTATS:
		case SIOCGIFADDR:
		case SIOCGIFADDR_IN6:
		case SIOCGIFAFLAG_IN6:
		case SIOCGIFALIFETIME_IN6:
		case SIOCGIFBRDADDR:
		case SIOCGIFDLT:
		case SIOCGIFDSTADDR:
		case SIOCGIFDSTADDR_IN6:
		case SIOCGIFFLAGS:
		case SIOCGIFGENERIC:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFNETMASK:
		case SIOCGIFNETMASK_IN6:
		case SIOCGIFPDSTADDR:
		case SIOCGIFPDSTADDR_IN6:
		case SIOCGIFPSRCADDR:
		case SIOCGIFPSRCADDR_IN6:
		case SIOCGIFSTAT_ICMP6:
		case SIOCGIFSTAT_IN6:
		case SIOCGVH:
		case SIOCIFCREATE:
		case SIOCIFDESTROY:
		case SIOCS80211NWID:
		case SIOCSIFADDR:
		case SIOCSIFADDR_IN6:
		case SIOCSIFBRDADDR:
		case SIOCSIFDSTADDR:
		case SIOCSIFDSTADDR_IN6:
		case SIOCSIFFLAGS:
		case SIOCSIFGENERIC:
		case SIOCSIFMEDIA:
		case SIOCSIFMETRIC:
		case SIOCSIFMTU:
		case SIOCSIFNETMASK:
		case SIOCSIFNETMASK_IN6:
		case SIOCSVH:
		case TAPGIFNAME:
			return ncmd;
		default:
		    {	int rv;

			MODULE_HOOK_CALL(if43_cvtcmd_20_hook, (ncmd), enosys(),
			    rv);
			if (rv == 0)
				return ncmd;
			return cmd;
		    }
		}
	}
}

int
compat_ifioctl(struct socket *so, u_long ocmd, u_long cmd, void *data,
    struct lwp *l)
{
	int error;
	struct ifreq *ifr = (struct ifreq *)data;
	struct ifreq ifrb;
	struct oifreq *oifr = NULL;
	struct ifnet *ifp;
	struct sockaddr *sa;
	struct psref psref;
	int bound = curlwp_bind();

	ifp = if_get(ifr->ifr_name, &psref);
	if (ifp == NULL) {
		curlwp_bindx(bound);
		return ENXIO;
	}

	/*
	 * If we have not been converted, make sure that we are.
	 * (because the upper layer handles old socket calls, but
	 * not oifreq calls.
	 */
	if (cmd == ocmd) {
		cmd = compat_cvtcmd(ocmd);
	}
	if (cmd != ocmd) {
		oifr = data;
		ifr = &ifrb;
		IFREQO2N_43(oifr, ifr);
	}

	switch (ocmd) {
		enum { maxlen = sizeof(oifr->ifr_ifru) };
		CTASSERT(maxlen == 16);
		socklen_t famlen;
	case OSIOCSIFADDR:
	case OSIOCSIFDSTADDR:
	case OSIOCSIFBRDADDR:
	case OSIOCSIFNETMASK:
		sa = &ifr->ifr_addr;
#if BYTE_ORDER != BIG_ENDIAN
		if (sa->sa_family == 0 && sa->sa_len < maxlen) {
			sa->sa_family = sa->sa_len;
			sa->sa_len = maxlen;
		}
#else
		if (sa->sa_len == 0)
			sa->sa_len = maxlen;
#endif
		famlen = sockaddr_getsize_by_family(sa->sa_family);
		if (famlen > sa->sa_len) {
			curlwp_bindx(bound);
			return EAFNOSUPPORT;
		}

		break;
	}

	error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so, cmd, ifr, ifp);
	if_put(ifp, &psref);
	curlwp_bindx(bound);

	switch (ocmd) {
	case OOSIOCGIFADDR:
	case OOSIOCGIFDSTADDR:
	case OOSIOCGIFBRDADDR:
	case OOSIOCGIFNETMASK:
		*(u_int16_t *)&ifr->ifr_addr = 
		    ((struct sockaddr *)&ifr->ifr_addr)->sa_family;
		break;
	}

	if (cmd != ocmd)
		IFREQN2O_43(oifr, ifr);

	return error;
}

int
if_43_init(void)
{

	MODULE_HOOK_SET(if_cvtcmd_43_hook, do_compat_cvtcmd);
	MODULE_HOOK_SET(if_ifioctl_43_hook, compat_ifioctl);
	return 0;
}

int
if_43_fini(void)
{

	MODULE_HOOK_UNSET(if_cvtcmd_43_hook);
	MODULE_HOOK_UNSET(if_ifioctl_43_hook);
	return 0;
}
#endif /* defined(COMPAT_43) */