ifgif.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2009 Hiroki Sato.  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.
 *
 * 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 OR HIS RELATIVES 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 MIND, 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/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>

#include <stdlib.h>
#include <unistd.h>

#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_gif.h>
#include <net/route.h>

#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>

#include "ifconfig.h"

static const char *GIFBITS[] = {
	[0] = "NOCLAMP",
	[1] = "IGNORE_SOURCE",
};

static void
gif_status(if_ctx *ctx)
{
	int opts;
	struct ifreq ifr = { .ifr_data = (caddr_t)&opts };

	if (ioctl_ctx_ifr(ctx, GIFGOPTS, &ifr) == -1)
		return;
	if (opts == 0)
		return;
	printf("\toptions=%x", opts);
	print_bits("options", &opts, 1, GIFBITS, nitems(GIFBITS));
	putchar('\n');
}

static void
setgifopts(if_ctx *ctx, const char *val __unused, int d)
{
	int opts;
	struct ifreq ifr = { .ifr_data = (caddr_t)&opts };

	if (ioctl_ctx_ifr(ctx, GIFGOPTS, &ifr) == -1) {
		warn("ioctl(GIFGOPTS)");
		return;
	}

	if (d < 0)
		opts &= ~(-d);
	else
		opts |= d;

	if (ioctl_ctx(ctx, GIFSOPTS, &ifr) == -1) {
		warn("ioctl(GIFSOPTS)");
		return;
	}
}

static struct cmd gif_cmds[] = {
	DEF_CMD("noclamp",		GIF_NOCLAMP,		setgifopts),
	DEF_CMD("-noclamp",		-GIF_NOCLAMP,		setgifopts),
	DEF_CMD("ignore_source",	GIF_IGNORE_SOURCE,	setgifopts),
	DEF_CMD("-ignore_source",	-GIF_IGNORE_SOURCE,	setgifopts),
};

static struct afswtch af_gif = {
	.af_name	= "af_gif",
	.af_af		= AF_UNSPEC,
	.af_other_status = gif_status,
};

static __constructor void
gif_ctor(void)
{
	size_t i;

	for (i = 0; i < nitems(gif_cmds); i++)
		cmd_register(&gif_cmds[i]);
	af_register(&af_gif);
}