/* Shared library add-on to iptables to add ULOG support.

 * 

 * (C) 2000 by Harald Welte <laforge@gnumonks.org>

 *

 * multipart netlink support based on ideas by Sebastian Zander 

 * 						<zander@fokus.gmd.de>

 *

 * This software is released under the terms of GNU GPL

 * 

 * libipt_ULOG.c,v 1.7 2001/01/30 11:55:02 laforge Exp

 */

#include <stdio.h>

#include <string.h>

#include <xtables.h>

/* For 64bit kernel / 32bit userspace */

#include <linux/netfilter_ipv4/ipt_ULOG.h>

enum {

	O_ULOG_NLGROUP = 0,

	O_ULOG_PREFIX,

	O_ULOG_CPRANGE,

	O_ULOG_QTHR,

};

static void ULOG_help(void)

{

	printf("ULOG target options:\n"

	       " --ulog-nlgroup nlgroup		NETLINK group used for logging\n"

	       " --ulog-cprange size		Bytes of each packet to be passed\n"

	       " --ulog-qthreshold		Threshold of in-kernel queue\n"

	       " --ulog-prefix prefix		Prefix log messages with this prefix.\n");

}

static const struct xt_option_entry ULOG_opts[] = {

	{.name = "ulog-nlgroup", .id = O_ULOG_NLGROUP, .type = XTTYPE_UINT8,

	 .min = 1, .max = 32},

	{.name = "ulog-prefix", .id = O_ULOG_PREFIX, .type = XTTYPE_STRING,

	 .flags = XTOPT_PUT, XTOPT_POINTER(struct ipt_ulog_info, prefix),

	 .min = 1},

	{.name = "ulog-cprange", .id = O_ULOG_CPRANGE, .type = XTTYPE_UINT64},

	{.name = "ulog-qthreshold", .id = O_ULOG_QTHR, .type = XTTYPE_UINT64,

	 .min = 1, .max = ULOG_MAX_QLEN},

	XTOPT_TABLEEND,

};

static void ULOG_init(struct xt_entry_target *t)

{

	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) t->data;

	loginfo->nl_group = ULOG_DEFAULT_NLGROUP;

	loginfo->qthreshold = ULOG_DEFAULT_QTHRESHOLD;

}

static void ULOG_parse(struct xt_option_call *cb)

{

	struct ipt_ulog_info *loginfo = cb->data;

	xtables_option_parse(cb);

	switch (cb->entry->id) {

	case O_ULOG_NLGROUP:

		loginfo->nl_group = 1 << (cb->val.u8 - 1);

		break;

	case O_ULOG_PREFIX:

		if (strchr(cb->arg, '\n') != NULL)

			xtables_error(PARAMETER_PROBLEM,

				   "Newlines not allowed in --ulog-prefix");

		break;

	case O_ULOG_CPRANGE:

		loginfo->copy_range = cb->val.u64;

		break;

	case O_ULOG_QTHR:

		loginfo->qthreshold = cb->val.u64;

		break;

	}

}

static void ULOG_save(const void *ip, const struct xt_entry_target *target)

{

	const struct ipt_ulog_info *loginfo

	    = (const struct ipt_ulog_info *) target->data;

	if (strcmp(loginfo->prefix, "") != 0) {

		fputs(" --ulog-prefix", stdout);

		xtables_save_string(loginfo->prefix);

	}

	if (loginfo->nl_group != ULOG_DEFAULT_NLGROUP)

		printf(" --ulog-nlgroup %d", ffs(loginfo->nl_group));

	if (loginfo->copy_range)

		printf(" --ulog-cprange %u", (unsigned int)loginfo->copy_range);

	if (loginfo->qthreshold != ULOG_DEFAULT_QTHRESHOLD)

		printf(" --ulog-qthreshold %u", (unsigned int)loginfo->qthreshold);

}

static void ULOG_print(const void *ip, const struct xt_entry_target *target,

                       int numeric)

{

	const struct ipt_ulog_info *loginfo

	    = (const struct ipt_ulog_info *) target->data;

	printf(" ULOG ");

	printf("copy_range %u nlgroup %d", (unsigned int)loginfo->copy_range,

	       ffs(loginfo->nl_group));

	if (strcmp(loginfo->prefix, "") != 0)

		printf(" prefix \"%s\"", loginfo->prefix);

	printf(" queue_threshold %u", (unsigned int)loginfo->qthreshold);

}

static struct xtables_target ulog_tg_reg = {

	.name		= "ULOG",

	.version	= XTABLES_VERSION,

	.family		= NFPROTO_IPV4,

	.size		= XT_ALIGN(sizeof(struct ipt_ulog_info)),

	.userspacesize	= XT_ALIGN(sizeof(struct ipt_ulog_info)),

	.help		= ULOG_help,

	.init		= ULOG_init,

	.print		= ULOG_print,

	.save		= ULOG_save,

	.x6_parse	= ULOG_parse,

	.x6_options	= ULOG_opts,

};

void _init(void)

{

	xtables_register_target(&ulog_tg_reg);

}