extensions/libxt_CONNMARK.c - platform/external/iptables - Git at Google

 /* Shared library add-on to iptables to add CONNMARK target support.
  *
  * (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
  * by Henrik Nordstrom <hno@marasystems.com>
  *
  * Version 1.1
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <getopt.h>

 #include <xtables.h>
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_CONNMARK.h>

 enum {
 	F_MARK    = 1 << 0,
 	F_SR_MARK = 1 << 1,
 };

 static void CONNMARK_help(void)
 {
 	printf(
 "CONNMARK target options:\n"
 "  --set-mark value[/mask]       Set conntrack mark value\n"
 "  --save-mark [--mask mask]     Save the packet nfmark in the connection\n"
 "  --restore-mark [--mask mask]  Restore saved nfmark value\n");
 }

 static const struct option CONNMARK_opts[] = {
 	{ "set-mark", 1, NULL, '1' },
 	{ "save-mark", 0, NULL, '2' },
 	{ "restore-mark", 0, NULL, '3' },
 	{ "mask", 1, NULL, '4' },
 	{ .name = NULL }
 };

 static const struct option connmark_tg_opts[] = {
 	{.name = "set-xmark",     .has_arg = true,  .val = '='},
 	{.name = "set-mark",      .has_arg = true,  .val = '-'},
 	{.name = "and-mark",      .has_arg = true,  .val = '&'},
 	{.name = "or-mark",       .has_arg = true,  .val = '|'},
 	{.name = "xor-mark",      .has_arg = true,  .val = '^'},
 	{.name = "save-mark",     .has_arg = false, .val = 'S'},
 	{.name = "restore-mark",  .has_arg = false, .val = 'R'},
 	{.name = "ctmask",        .has_arg = true,  .val = 'c'},
 	{.name = "nfmask",        .has_arg = true,  .val = 'n'},
 	{.name = "mask",          .has_arg = true,  .val = 'm'},
 	{.name = NULL},
 };

 static void connmark_tg_help(void)
 {
 	printf(
 "CONNMARK target options:\n"
 "  --set-xmark value[/ctmask]    Zero mask bits and XOR ctmark with value\n"
 "  --save-mark [--ctmask mask] [--nfmask mask]\n"
 "                                Copy ctmark to nfmark using masks\n"
 "  --restore-mark [--ctmask mask] [--nfmask mask]\n"
 "                                Copy nfmark to ctmark using masks\n"
 "  --set-mark value[/mask]       Set conntrack mark value\n"
 "  --save-mark [--mask mask]     Save the packet nfmark in the connection\n"
 "  --restore-mark [--mask mask]  Restore saved nfmark value\n"
 "  --and-mark value              Binary AND the ctmark with bits\n"
 "  --or-mark value               Binary OR  the ctmark with bits\n"
 "  --xor-mark value              Binary XOR the ctmark with bits\n"
 );
 }

 static void connmark_tg_init(struct xt_entry_target *target)
 {
 	struct xt_connmark_tginfo1 *info = (void *)target->data;

 	/*
 	 * Need these defaults for --save-mark/--restore-mark if no
 	 * --ctmark or --nfmask is given.
 	 */
 	info->ctmask = UINT32_MAX;
 	info->nfmask = UINT32_MAX;
 }

 static int
 CONNMARK_parse(int c, char **argv, int invert, unsigned int *flags,
                const void *entry, struct xt_entry_target **target)
 {
 	struct xt_connmark_target_info *markinfo
 		= (struct xt_connmark_target_info *)(*target)->data;

 	switch (c) {
 		char *end;
 	case '1':
 		markinfo->mode = XT_CONNMARK_SET;

 		markinfo->mark = strtoul(optarg, &end, 0);
 		if (*end == '/' && end[1] != '\0')
 		    markinfo->mask = strtoul(end+1, &end, 0);

 		if (*end != '\0' || end == optarg)
 			xtables_error(PARAMETER_PROBLEM, "Bad MARK value \"%s\"", optarg);
 		if (*flags)
 			xtables_error(PARAMETER_PROBLEM,
 			           "CONNMARK target: Can't specify --set-mark twice");
 		*flags = 1;
 		break;
 	case '2':
 		markinfo->mode = XT_CONNMARK_SAVE;
 		if (*flags)
 			xtables_error(PARAMETER_PROBLEM,
 			           "CONNMARK target: Can't specify --save-mark twice");
 		*flags = 1;
 		break;
 	case '3':
 		markinfo->mode = XT_CONNMARK_RESTORE;
 		if (*flags)
 			xtables_error(PARAMETER_PROBLEM,
 			           "CONNMARK target: Can't specify --restore-mark twice");
 		*flags = 1;
 		break;
 	case '4':
 		if (!*flags)
 			xtables_error(PARAMETER_PROBLEM,
 			           "CONNMARK target: Can't specify --mask without a operation");
 		markinfo->mask = strtoul(optarg, &end, 0);

 		if (*end != '\0' || end == optarg)
 			xtables_error(PARAMETER_PROBLEM, "Bad MASK value \"%s\"", optarg);
 		break;
 	default:
 		return 0;
 	}

 	return 1;
 }

 static int connmark_tg_parse(int c, char **argv, int invert,
                              unsigned int *flags, const void *entry,
                              struct xt_entry_target **target)
 {
 	struct xt_connmark_tginfo1 *info = (void *)(*target)->data;
 	unsigned int value, mask = UINT32_MAX;
 	char *end;

 	switch (c) {
 	case '=': /* --set-xmark */
 	case '-': /* --set-mark */
 		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
 		if (!xtables_strtoui(optarg, &end, &value, 0, UINT32_MAX))
 			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
 		if (*end == '/')
 			if (!xtables_strtoui(end + 1, &end, &mask, 0, UINT32_MAX))
 				xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
 		if (*end != '\0')
 			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
 		info->mode   = XT_CONNMARK_SET;
 		info->ctmark = value;
 		info->ctmask = mask;
 		if (c == '-')
 			info->ctmask |= value;
 		*flags |= F_MARK;
 		return true;

 	case '&': /* --and-mark */
 		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
 		if (!xtables_strtoui(optarg, NULL, &mask, 0, UINT32_MAX))
 			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--and-mark", optarg);
 		info->mode   = XT_CONNMARK_SET;
 		info->ctmark = 0;
 		info->ctmask = ~mask;
 		*flags      |= F_MARK;
 		return true;

 	case '|': /* --or-mark */
 		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
 		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
 			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--or-mark", optarg);
 		info->mode   = XT_CONNMARK_SET;
 		info->ctmark = value;
 		info->ctmask = value;
 		*flags      |= F_MARK;
 		return true;

 	case '^': /* --xor-mark */
 		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
 		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
 			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--xor-mark", optarg);
 		info->mode   = XT_CONNMARK_SET;
 		info->ctmark = value;
 		info->ctmask = 0;
 		*flags      |= F_MARK;
 		return true;

 	case 'S': /* --save-mark */
 		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
 		info->mode = XT_CONNMARK_SAVE;
 		*flags |= F_MARK | F_SR_MARK;
 		return true;

 	case 'R': /* --restore-mark */
 		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
 		info->mode = XT_CONNMARK_RESTORE;
 		*flags |= F_MARK | F_SR_MARK;
 		return true;

 	case 'n': /* --nfmask */
 		if (!(*flags & F_SR_MARK))
 			xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
 			           "or --restore-mark is required for "
 			           "--nfmask");
 		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
 			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--nfmask", optarg);
 		info->nfmask = value;
 		return true;

 	case 'c': /* --ctmask */
 		if (!(*flags & F_SR_MARK))
 			xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
 			           "or --restore-mark is required for "
 			           "--ctmask");
 		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
 			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--ctmask", optarg);
 		info->ctmask = value;
 		return true;

 	case 'm': /* --mask */
 		if (!(*flags & F_SR_MARK))
 			xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
 			           "or --restore-mark is required for "
 			           "--mask");
 		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
 			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--mask", optarg);
 		info->nfmask = info->ctmask = value;
 		return true;
 	}

 	return false;
 }

 static void connmark_tg_check(unsigned int flags)
 {
 	if (!flags)
 		xtables_error(PARAMETER_PROBLEM,
 		           "CONNMARK target: No operation specified");
 }

 static void
 print_mark(unsigned long mark)
 {
 	printf("0x%lx", mark);
 }

 static void
 print_mask(const char *text, unsigned long mask)
 {
 	if (mask != 0xffffffffUL)
 		printf("%s0x%lx", text, mask);
 }

 static void CONNMARK_print(const void *ip,
                            const struct xt_entry_target *target, int numeric)
 {
 	const struct xt_connmark_target_info *markinfo =
 		(const struct xt_connmark_target_info *)target->data;
 	switch (markinfo->mode) {
 	case XT_CONNMARK_SET:
 	    printf("CONNMARK set ");
 	    print_mark(markinfo->mark);
 	    print_mask("/", markinfo->mask);
 	    printf(" ");
 	    break;
 	case XT_CONNMARK_SAVE:
 	    printf("CONNMARK save ");
 	    print_mask("mask ", markinfo->mask);
 	    printf(" ");
 	    break;
 	case XT_CONNMARK_RESTORE:
 	    printf("CONNMARK restore ");
 	    print_mask("mask ", markinfo->mask);
 	    break;
 	default:
 	    printf("ERROR: UNKNOWN CONNMARK MODE ");
 	    break;
 	}
 }

 static void
 connmark_tg_print(const void *ip, const struct xt_entry_target *target,
                   int numeric)
 {
 	const struct xt_connmark_tginfo1 *info = (const void *)target->data;

 	switch (info->mode) {
 	case XT_CONNMARK_SET:
 		if (info->ctmark == 0)
 			printf("CONNMARK and 0x%x ",
 			       (unsigned int)(u_int32_t)~info->ctmask);
 		else if (info->ctmark == info->ctmask)
 			printf("CONNMARK or 0x%x ", info->ctmark);
 		else if (info->ctmask == 0)
 			printf("CONNMARK xor 0x%x ", info->ctmark);
 		else
 			printf("CONNMARK xset 0x%x/0x%x ",
 			       info->ctmark, info->ctmask);
 		break;
 	case XT_CONNMARK_SAVE:
 		if (info->nfmask == UINT32_MAX && info->ctmask == UINT32_MAX)
 			printf("CONNMARK save ");
 		else if (info->nfmask == info->ctmask)
 			printf("CONNMARK save mask 0x%x ", info->nfmask);
 		else
 			printf("CONNMARK save nfmask 0x%x ctmask ~0x%x ",
 			       info->nfmask, info->ctmask);
 		break;
 	case XT_CONNMARK_RESTORE:
 		if (info->ctmask == UINT32_MAX && info->nfmask == UINT32_MAX)
 			printf("CONNMARK restore ");
 		else if (info->ctmask == info->nfmask)
 			printf("CONNMARK restore mask 0x%x ", info->ctmask);
 		else
 			printf("CONNMARK restore ctmask 0x%x nfmask ~0x%x ",
 			       info->ctmask, info->nfmask);
 		break;

 	default:
 		printf("ERROR: UNKNOWN CONNMARK MODE");
 		break;
 	}
 }

 static void CONNMARK_save(const void *ip, const struct xt_entry_target *target)
 {
 	const struct xt_connmark_target_info *markinfo =
 		(const struct xt_connmark_target_info *)target->data;

 	switch (markinfo->mode) {
 	case XT_CONNMARK_SET:
 	    printf("--set-mark ");
 	    print_mark(markinfo->mark);
 	    print_mask("/", markinfo->mask);
 	    printf(" ");
 	    break;
 	case XT_CONNMARK_SAVE:
 	    printf("--save-mark ");
 	    print_mask("--mask ", markinfo->mask);
 	    break;
 	case XT_CONNMARK_RESTORE:
 	    printf("--restore-mark ");
 	    print_mask("--mask ", markinfo->mask);
 	    break;
 	default:
 	    printf("ERROR: UNKNOWN CONNMARK MODE ");
 	    break;
 	}
 }

 static void CONNMARK_init(struct xt_entry_target *t)
 {
 	struct xt_connmark_target_info *markinfo
 		= (struct xt_connmark_target_info *)t->data;

 	markinfo->mask = 0xffffffffUL;
 }

 static void
 connmark_tg_save(const void *ip, const struct xt_entry_target *target)
 {
 	const struct xt_connmark_tginfo1 *info = (const void *)target->data;

 	switch (info->mode) {
 	case XT_CONNMARK_SET:
 		printf("--set-xmark 0x%x/0x%x ", info->ctmark, info->ctmask);
 		break;
 	case XT_CONNMARK_SAVE:
 		printf("--save-mark --nfmask 0x%x --ctmask 0x%x ",
 		       info->nfmask, info->ctmask);
 		break;
 	case XT_CONNMARK_RESTORE:
 		printf("--restore-mark --nfmask 0x%x --ctmask 0x%x ",
 		       info->nfmask, info->ctmask);
 		break;
 	default:
 		printf("ERROR: UNKNOWN CONNMARK MODE");
 		break;
 	}
 }

 static struct xtables_target connmark_tg_reg[] = {
 	{
 		.family        = NFPROTO_UNSPEC,
 		.name          = "CONNMARK",
 		.revision      = 0,
 		.version       = XTABLES_VERSION,
 		.size          = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
 		.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
 		.help          = CONNMARK_help,
 		.init          = CONNMARK_init,
 		.parse         = CONNMARK_parse,
 		.final_check   = connmark_tg_check,
 		.print         = CONNMARK_print,
 		.save          = CONNMARK_save,
 		.extra_opts    = CONNMARK_opts,
 	},
 	{
 		.version       = XTABLES_VERSION,
 		.name          = "CONNMARK",
 		.revision      = 1,
 		.family        = NFPROTO_UNSPEC,
 		.size          = XT_ALIGN(sizeof(struct xt_connmark_tginfo1)),
 		.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_tginfo1)),
 		.help          = connmark_tg_help,
 		.init          = connmark_tg_init,
 		.parse         = connmark_tg_parse,
 		.final_check   = connmark_tg_check,
 		.print         = connmark_tg_print,
 		.save          = connmark_tg_save,
 		.extra_opts    = connmark_tg_opts,
 	},
 };

 void _init(void)
 {
 	xtables_register_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg));
 }
	/* Shared library add-on to iptables to add CONNMARK target support.
	*
	* (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
	* by Henrik Nordstrom <hno@marasystems.com>
	*
	* Version 1.1
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/
	#include <stdio.h>
	#include <string.h>
	#include <stdlib.h>
	#include <getopt.h>

	#include <xtables.h>
	#include <linux/netfilter/x_tables.h>
	#include <linux/netfilter/xt_CONNMARK.h>

	enum {
	F_MARK = 1 << 0,
	F_SR_MARK = 1 << 1,
	};

	static void CONNMARK_help(void)
	{
	printf(
	"CONNMARK target options:\n"
	" --set-mark value[/mask] Set conntrack mark value\n"
	" --save-mark [--mask mask] Save the packet nfmark in the connection\n"
	" --restore-mark [--mask mask] Restore saved nfmark value\n");
	}

	static const struct option CONNMARK_opts[] = {
	{ "set-mark", 1, NULL, '1' },
	{ "save-mark", 0, NULL, '2' },
	{ "restore-mark", 0, NULL, '3' },
	{ "mask", 1, NULL, '4' },
	{ .name = NULL }
	};

	static const struct option connmark_tg_opts[] = {
	{.name = "set-xmark", .has_arg = true, .val = '='},
	{.name = "set-mark", .has_arg = true, .val = '-'},
	{.name = "and-mark", .has_arg = true, .val = '&'},
	{.name = "or-mark", .has_arg = true, .val = '\|'},
	{.name = "xor-mark", .has_arg = true, .val = '^'},
	{.name = "save-mark", .has_arg = false, .val = 'S'},
	{.name = "restore-mark", .has_arg = false, .val = 'R'},
	{.name = "ctmask", .has_arg = true, .val = 'c'},
	{.name = "nfmask", .has_arg = true, .val = 'n'},
	{.name = "mask", .has_arg = true, .val = 'm'},
	{.name = NULL},
	};

	static void connmark_tg_help(void)
	{
	printf(
	"CONNMARK target options:\n"
	" --set-xmark value[/ctmask] Zero mask bits and XOR ctmark with value\n"
	" --save-mark [--ctmask mask] [--nfmask mask]\n"
	" Copy ctmark to nfmark using masks\n"
	" --restore-mark [--ctmask mask] [--nfmask mask]\n"
	" Copy nfmark to ctmark using masks\n"
	" --set-mark value[/mask] Set conntrack mark value\n"
	" --save-mark [--mask mask] Save the packet nfmark in the connection\n"
	" --restore-mark [--mask mask] Restore saved nfmark value\n"
	" --and-mark value Binary AND the ctmark with bits\n"
	" --or-mark value Binary OR the ctmark with bits\n"
	" --xor-mark value Binary XOR the ctmark with bits\n"
	);
	}

	static void connmark_tg_init(struct xt_entry_target *target)
	{
	struct xt_connmark_tginfo1 info = (void )target->data;

	/*
	* Need these defaults for --save-mark/--restore-mark if no
	* --ctmark or --nfmask is given.
	*/
	info->ctmask = UINT32_MAX;
	info->nfmask = UINT32_MAX;
	}

	static int
	CONNMARK_parse(int c, char *argv, int invert, unsigned int flags,
	const void entry, struct xt_entry_target *target)
	{
	struct xt_connmark_target_info *markinfo
	= (struct xt_connmark_target_info )(target)->data;

	switch (c) {
	char *end;
	case '1':
	markinfo->mode = XT_CONNMARK_SET;

	markinfo->mark = strtoul(optarg, &end, 0);
	if (*end == '/' && end[1] != '\0')
	markinfo->mask = strtoul(end+1, &end, 0);

	if (*end != '\0' \|\| end == optarg)
	xtables_error(PARAMETER_PROBLEM, "Bad MARK value \"%s\"", optarg);
	if (*flags)
	xtables_error(PARAMETER_PROBLEM,
	"CONNMARK target: Can't specify --set-mark twice");
	*flags = 1;
	break;
	case '2':
	markinfo->mode = XT_CONNMARK_SAVE;
	if (*flags)
	xtables_error(PARAMETER_PROBLEM,
	"CONNMARK target: Can't specify --save-mark twice");
	*flags = 1;
	break;
	case '3':
	markinfo->mode = XT_CONNMARK_RESTORE;
	if (*flags)
	xtables_error(PARAMETER_PROBLEM,
	"CONNMARK target: Can't specify --restore-mark twice");
	*flags = 1;
	break;
	case '4':
	if (!*flags)
	xtables_error(PARAMETER_PROBLEM,
	"CONNMARK target: Can't specify --mask without a operation");
	markinfo->mask = strtoul(optarg, &end, 0);

	if (*end != '\0' \|\| end == optarg)
	xtables_error(PARAMETER_PROBLEM, "Bad MASK value \"%s\"", optarg);
	break;
	default:
	return 0;
	}

	return 1;
	}

	static int connmark_tg_parse(int c, char **argv, int invert,
	unsigned int flags, const void entry,
	struct xt_entry_target **target)
	{
	struct xt_connmark_tginfo1 info = (void )(*target)->data;
	unsigned int value, mask = UINT32_MAX;
	char *end;

	switch (c) {
	case '=': /* --set-xmark */
	case '-': /* --set-mark */
	xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
	if (!xtables_strtoui(optarg, &end, &value, 0, UINT32_MAX))
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
	if (*end == '/')
	if (!xtables_strtoui(end + 1, &end, &mask, 0, UINT32_MAX))
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
	if (*end != '\0')
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
	info->mode = XT_CONNMARK_SET;
	info->ctmark = value;
	info->ctmask = mask;
	if (c == '-')
	info->ctmask \|= value;
	*flags \|= F_MARK;
	return true;

	case '&': /* --and-mark */
	xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
	if (!xtables_strtoui(optarg, NULL, &mask, 0, UINT32_MAX))
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--and-mark", optarg);
	info->mode = XT_CONNMARK_SET;
	info->ctmark = 0;
	info->ctmask = ~mask;
	*flags \|= F_MARK;
	return true;

	case '\|': /* --or-mark */
	xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
	if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--or-mark", optarg);
	info->mode = XT_CONNMARK_SET;
	info->ctmark = value;
	info->ctmask = value;
	*flags \|= F_MARK;
	return true;

	case '^': /* --xor-mark */
	xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
	if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--xor-mark", optarg);
	info->mode = XT_CONNMARK_SET;
	info->ctmark = value;
	info->ctmask = 0;
	*flags \|= F_MARK;
	return true;

	case 'S': /* --save-mark */
	xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
	info->mode = XT_CONNMARK_SAVE;
	*flags \|= F_MARK \| F_SR_MARK;
	return true;

	case 'R': /* --restore-mark */
	xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
	info->mode = XT_CONNMARK_RESTORE;
	*flags \|= F_MARK \| F_SR_MARK;
	return true;

	case 'n': /* --nfmask */
	if (!(*flags & F_SR_MARK))
	xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
	"or --restore-mark is required for "
	"--nfmask");
	if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--nfmask", optarg);
	info->nfmask = value;
	return true;

	case 'c': /* --ctmask */
	if (!(*flags & F_SR_MARK))
	xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
	"or --restore-mark is required for "
	"--ctmask");
	if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--ctmask", optarg);
	info->ctmask = value;
	return true;

	case 'm': /* --mask */
	if (!(*flags & F_SR_MARK))
	xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
	"or --restore-mark is required for "
	"--mask");
	if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
	xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--mask", optarg);
	info->nfmask = info->ctmask = value;
	return true;
	}

	return false;
	}

	static void connmark_tg_check(unsigned int flags)
	{
	if (!flags)
	xtables_error(PARAMETER_PROBLEM,
	"CONNMARK target: No operation specified");
	}

	static void
	print_mark(unsigned long mark)
	{
	printf("0x%lx", mark);
	}

	static void
	print_mask(const char *text, unsigned long mask)
	{
	if (mask != 0xffffffffUL)
	printf("%s0x%lx", text, mask);
	}

	static void CONNMARK_print(const void *ip,
	const struct xt_entry_target *target, int numeric)
	{
	const struct xt_connmark_target_info *markinfo =
	(const struct xt_connmark_target_info *)target->data;
	switch (markinfo->mode) {
	case XT_CONNMARK_SET:
	printf("CONNMARK set ");
	print_mark(markinfo->mark);
	print_mask("/", markinfo->mask);
	printf(" ");
	break;
	case XT_CONNMARK_SAVE:
	printf("CONNMARK save ");
	print_mask("mask ", markinfo->mask);
	printf(" ");
	break;
	case XT_CONNMARK_RESTORE:
	printf("CONNMARK restore ");
	print_mask("mask ", markinfo->mask);
	break;
	default:
	printf("ERROR: UNKNOWN CONNMARK MODE ");
	break;
	}
	}

	static void
	connmark_tg_print(const void ip, const struct xt_entry_target target,
	int numeric)
	{
	const struct xt_connmark_tginfo1 info = (const void )target->data;

	switch (info->mode) {
	case XT_CONNMARK_SET:
	if (info->ctmark == 0)
	printf("CONNMARK and 0x%x ",
	(unsigned int)(u_int32_t)~info->ctmask);
	else if (info->ctmark == info->ctmask)
	printf("CONNMARK or 0x%x ", info->ctmark);
	else if (info->ctmask == 0)
	printf("CONNMARK xor 0x%x ", info->ctmark);
	else
	printf("CONNMARK xset 0x%x/0x%x ",
	info->ctmark, info->ctmask);
	break;
	case XT_CONNMARK_SAVE:
	if (info->nfmask == UINT32_MAX && info->ctmask == UINT32_MAX)
	printf("CONNMARK save ");
	else if (info->nfmask == info->ctmask)
	printf("CONNMARK save mask 0x%x ", info->nfmask);
	else
	printf("CONNMARK save nfmask 0x%x ctmask ~0x%x ",
	info->nfmask, info->ctmask);
	break;
	case XT_CONNMARK_RESTORE:
	if (info->ctmask == UINT32_MAX && info->nfmask == UINT32_MAX)
	printf("CONNMARK restore ");
	else if (info->ctmask == info->nfmask)
	printf("CONNMARK restore mask 0x%x ", info->ctmask);
	else
	printf("CONNMARK restore ctmask 0x%x nfmask ~0x%x ",
	info->ctmask, info->nfmask);
	break;

	default:
	printf("ERROR: UNKNOWN CONNMARK MODE");
	break;
	}
	}

	static void CONNMARK_save(const void ip, const struct xt_entry_target target)
	{
	const struct xt_connmark_target_info *markinfo =
	(const struct xt_connmark_target_info *)target->data;

	switch (markinfo->mode) {
	case XT_CONNMARK_SET:
	printf("--set-mark ");
	print_mark(markinfo->mark);
	print_mask("/", markinfo->mask);
	printf(" ");
	break;
	case XT_CONNMARK_SAVE:
	printf("--save-mark ");
	print_mask("--mask ", markinfo->mask);
	break;
	case XT_CONNMARK_RESTORE:
	printf("--restore-mark ");
	print_mask("--mask ", markinfo->mask);
	break;
	default:
	printf("ERROR: UNKNOWN CONNMARK MODE ");
	break;
	}
	}

	static void CONNMARK_init(struct xt_entry_target *t)
	{
	struct xt_connmark_target_info *markinfo
	= (struct xt_connmark_target_info *)t->data;

	markinfo->mask = 0xffffffffUL;
	}

	static void
	connmark_tg_save(const void ip, const struct xt_entry_target target)
	{
	const struct xt_connmark_tginfo1 info = (const void )target->data;

	switch (info->mode) {
	case XT_CONNMARK_SET:
	printf("--set-xmark 0x%x/0x%x ", info->ctmark, info->ctmask);
	break;
	case XT_CONNMARK_SAVE:
	printf("--save-mark --nfmask 0x%x --ctmask 0x%x ",
	info->nfmask, info->ctmask);
	break;
	case XT_CONNMARK_RESTORE:
	printf("--restore-mark --nfmask 0x%x --ctmask 0x%x ",
	info->nfmask, info->ctmask);
	break;
	default:
	printf("ERROR: UNKNOWN CONNMARK MODE");
	break;
	}
	}

	static struct xtables_target connmark_tg_reg[] = {
	{
	.family = NFPROTO_UNSPEC,
	.name = "CONNMARK",
	.revision = 0,
	.version = XTABLES_VERSION,
	.size = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
	.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
	.help = CONNMARK_help,
	.init = CONNMARK_init,
	.parse = CONNMARK_parse,
	.final_check = connmark_tg_check,
	.print = CONNMARK_print,
	.save = CONNMARK_save,
	.extra_opts = CONNMARK_opts,
	},
	{
	.version = XTABLES_VERSION,
	.name = "CONNMARK",
	.revision = 1,
	.family = NFPROTO_UNSPEC,
	.size = XT_ALIGN(sizeof(struct xt_connmark_tginfo1)),
	.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_tginfo1)),
	.help = connmark_tg_help,
	.init = connmark_tg_init,
	.parse = connmark_tg_parse,
	.final_check = connmark_tg_check,
	.print = connmark_tg_print,
	.save = connmark_tg_save,
	.extra_opts = connmark_tg_opts,
	},
	};

	void _init(void)
	{
	xtables_register_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg));
	}