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/* 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 <stdbool.h>
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <getopt.h>
#include <xtables.h>
/* For 64bit kernel / 32bit userspace */
#include <linux/netfilter_ipv4/ipt_ULOG.h>
static void print_groups(unsigned int gmask)
{
int b;
unsigned int test;
for (b = 31; b >= 0; b--) {
test = (1 << b);
if (gmask & test)
printf("%d ", b + 1);
}
}
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 option ULOG_opts[] = {
{.name = "ulog-nlgroup", .has_arg = true, .val = '!'},
{.name = "ulog-prefix", .has_arg = true, .val = '#'},
{.name = "ulog-cprange", .has_arg = true, .val = 'A'},
{.name = "ulog-qthreshold", .has_arg = true, .val = 'B'},
XT_GETOPT_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;
}
#define IPT_LOG_OPT_NLGROUP 0x01
#define IPT_LOG_OPT_PREFIX 0x02
#define IPT_LOG_OPT_CPRANGE 0x04
#define IPT_LOG_OPT_QTHRESHOLD 0x08
static int ULOG_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct ipt_ulog_info *loginfo =
(struct ipt_ulog_info *) (*target)->data;
int group_d;
switch (c) {
case '!':
if (*flags & IPT_LOG_OPT_NLGROUP)
xtables_error(PARAMETER_PROBLEM,
"Can't specify --ulog-nlgroup twice");
if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
xtables_error(PARAMETER_PROBLEM,
"Unexpected `!' after --ulog-nlgroup");
group_d = atoi(optarg);
if (group_d > 32 || group_d < 1)
xtables_error(PARAMETER_PROBLEM,
"--ulog-nlgroup has to be between 1 and 32");
loginfo->nl_group = (1 << (group_d - 1));
*flags |= IPT_LOG_OPT_NLGROUP;
break;
case '#':
if (*flags & IPT_LOG_OPT_PREFIX)
xtables_error(PARAMETER_PROBLEM,
"Can't specify --ulog-prefix twice");
if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
xtables_error(PARAMETER_PROBLEM,
"Unexpected `!' after --ulog-prefix");
if (strlen(optarg) > sizeof(loginfo->prefix) - 1)
xtables_error(PARAMETER_PROBLEM,
"Maximum prefix length %u for --ulog-prefix",
(unsigned int)sizeof(loginfo->prefix) - 1);
if (strlen(optarg) == 0)
xtables_error(PARAMETER_PROBLEM,
"No prefix specified for --ulog-prefix");
if (strlen(optarg) != strlen(strtok(optarg, "\n")))
xtables_error(PARAMETER_PROBLEM,
"Newlines not allowed in --ulog-prefix");
strcpy(loginfo->prefix, optarg);
*flags |= IPT_LOG_OPT_PREFIX;
break;
case 'A':
if (*flags & IPT_LOG_OPT_CPRANGE)
xtables_error(PARAMETER_PROBLEM,
"Can't specify --ulog-cprange twice");
if (atoi(optarg) < 0)
xtables_error(PARAMETER_PROBLEM,
"Negative copy range?");
loginfo->copy_range = atoi(optarg);
*flags |= IPT_LOG_OPT_CPRANGE;
break;
case 'B':
if (*flags & IPT_LOG_OPT_QTHRESHOLD)
xtables_error(PARAMETER_PROBLEM,
"Can't specify --ulog-qthreshold twice");
if (atoi(optarg) < 1)
xtables_error(PARAMETER_PROBLEM,
"Negative or zero queue threshold ?");
if (atoi(optarg) > ULOG_MAX_QLEN)
xtables_error(PARAMETER_PROBLEM,
"Maximum queue length exceeded");
loginfo->qthreshold = atoi(optarg);
*flags |= IPT_LOG_OPT_QTHRESHOLD;
break;
default:
return 0;
}
return 1;
}
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 ");
print_groups(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 ", (unsigned int)loginfo->copy_range);
print_groups(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,
.parse = ULOG_parse,
.print = ULOG_print,
.save = ULOG_save,
.extra_opts = ULOG_opts,
};
void _init(void)
{
xtables_register_target(&ulog_tg_reg);
}
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