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/* ebt_nflog
*
* Authors:
* Peter Warasin <peter@endian.com>
*
* February, 2008
*
* Based on:
* ebt_ulog.c, (C) 2004, Bart De Schuymer <bdschuym@pandora.be>
* libxt_NFLOG.c
*
* Adapted to libxtables for ebtables-compat in 2015 by
* Arturo Borrero Gonzalez <arturo@debian.org>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <xtables.h>
#include "iptables/nft.h"
#include "iptables/nft-bridge.h"
#include <linux/netfilter_bridge/ebt_nflog.h>
enum {
NFLOG_GROUP = 0x1,
NFLOG_PREFIX = 0x2,
NFLOG_RANGE = 0x4,
NFLOG_THRESHOLD = 0x8,
NFLOG_NFLOG = 0x16,
};
static const struct option brnflog_opts[] = {
{ .name = "nflog-group", .has_arg = true, .val = NFLOG_GROUP},
{ .name = "nflog-prefix", .has_arg = true, .val = NFLOG_PREFIX},
{ .name = "nflog-range", .has_arg = true, .val = NFLOG_RANGE},
{ .name = "nflog-threshold", .has_arg = true, .val = NFLOG_THRESHOLD},
{ .name = "nflog", .has_arg = false, .val = NFLOG_NFLOG},
XT_GETOPT_TABLEEND,
};
static void brnflog_help(void)
{
printf("nflog options:\n"
"--nflog : use the default nflog parameters\n"
"--nflog-prefix prefix : Prefix string for log message\n"
"--nflog-group group : NETLINK group used for logging\n"
"--nflog-range range : Number of byte to copy\n"
"--nflog-threshold : Message threshold of"
"in-kernel queue\n");
}
static void brnflog_init(struct xt_entry_target *t)
{
struct ebt_nflog_info *info = (struct ebt_nflog_info *)t->data;
info->prefix[0] = '\0';
info->group = EBT_NFLOG_DEFAULT_GROUP;
info->threshold = EBT_NFLOG_DEFAULT_THRESHOLD;
}
static int brnflog_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct ebt_nflog_info *info = (struct ebt_nflog_info *)(*target)->data;
unsigned int i;
if (invert)
xtables_error(PARAMETER_PROBLEM,
"The use of '!' makes no sense for the"
" nflog watcher");
switch (c) {
case NFLOG_PREFIX:
EBT_CHECK_OPTION(flags, NFLOG_PREFIX);
if (strlen(optarg) > EBT_NFLOG_PREFIX_SIZE - 1)
xtables_error(PARAMETER_PROBLEM,
"Prefix too long for nflog-prefix");
strncpy(info->prefix, optarg, EBT_NFLOG_PREFIX_SIZE);
break;
case NFLOG_GROUP:
EBT_CHECK_OPTION(flags, NFLOG_GROUP);
if (!xtables_strtoui(optarg, NULL, &i, 1, UINT32_MAX))
xtables_error(PARAMETER_PROBLEM,
"--nflog-group must be a number!");
info->group = i;
break;
case NFLOG_RANGE:
EBT_CHECK_OPTION(flags, NFLOG_RANGE);
if (!xtables_strtoui(optarg, NULL, &i, 1, UINT32_MAX))
xtables_error(PARAMETER_PROBLEM,
"--nflog-range must be a number!");
info->len = i;
break;
case NFLOG_THRESHOLD:
EBT_CHECK_OPTION(flags, NFLOG_THRESHOLD);
if (!xtables_strtoui(optarg, NULL, &i, 1, UINT32_MAX))
xtables_error(PARAMETER_PROBLEM,
"--nflog-threshold must be a number!");
info->threshold = i;
break;
case NFLOG_NFLOG:
EBT_CHECK_OPTION(flags, NFLOG_NFLOG);
break;
default:
return 0;
}
return 1;
}
static void
brnflog_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
struct ebt_nflog_info *info = (struct ebt_nflog_info *)target->data;
if (info->prefix[0] != '\0')
printf("--nflog-prefix \"%s\" ", info->prefix);
if (info->group)
printf("--nflog-group %d ", info->group);
if (info->len)
printf("--nflog-range %d ", info->len);
if (info->threshold != EBT_NFLOG_DEFAULT_THRESHOLD)
printf("--nflog-threshold %d ", info->threshold);
}
static struct xtables_target brnflog_watcher = {
.name = "nflog",
.revision = 0,
.version = XTABLES_VERSION,
.family = NFPROTO_BRIDGE,
.size = XT_ALIGN(sizeof(struct ebt_nflog_info)),
.userspacesize = XT_ALIGN(sizeof(struct ebt_nflog_info)),
.init = brnflog_init,
.help = brnflog_help,
.parse = brnflog_parse,
.print = brnflog_print,
.extra_opts = brnflog_opts,
};
void _init(void)
{
xtables_register_target(&brnflog_watcher);
}
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