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/*
* Bart De Schuymer <bdschuym@pandora.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Giuseppe Longo <giuseppelng@gmail.com> adapted the original code to the
* xtables-compat environment in 2015.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <xtables.h>
#include <linux/netfilter_bridge/ebt_log.h>
#define LOG_DEFAULT_LEVEL LOG_INFO
struct code {
char *c_name;
int c_val;
};
static struct code eight_priority[] = {
{ "emerg", LOG_EMERG },
{ "alert", LOG_ALERT },
{ "crit", LOG_CRIT },
{ "error", LOG_ERR },
{ "warning", LOG_WARNING },
{ "notice", LOG_NOTICE },
{ "info", LOG_INFO },
{ "debug", LOG_DEBUG }
};
enum {
/* first three must correspond with bit pos in respective EBT_LOG_* */
O_LOG_IP = 0,
O_LOG_ARP = 1,
O_LOG_IP6 = 3,
O_LOG_PREFIX,
O_LOG_LEVEL,
O_LOG_LOG,
};
static const struct xt_option_entry brlog_opts[] = {
{ .name = "log-prefix", .id = O_LOG_PREFIX, .type = XTTYPE_STRING,
.flags = XTOPT_PUT, XTOPT_POINTER(struct ebt_log_info, prefix) },
{ .name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
.flags = XTOPT_PUT, XTOPT_POINTER(struct ebt_log_info, loglevel) },
{ .name = "log-arp", .id = O_LOG_ARP, .type = XTTYPE_NONE },
{ .name = "log-ip", .id = O_LOG_IP, .type = XTTYPE_NONE },
{ .name = "log", .id = O_LOG_LOG, .type = XTTYPE_NONE },
{ .name = "log-ip6", .id = O_LOG_IP6, .type = XTTYPE_NONE },
XTOPT_TABLEEND,
};
static void brlog_help(void)
{
int i;
printf(
"log options:\n"
"--log : use this if you're not specifying anything\n"
"--log-level level : level = [1-8] or a string\n"
"--log-prefix prefix : max. %d chars.\n"
"--log-ip : put ip info. in the log for ip packets\n"
"--log-arp : put (r)arp info. in the log for (r)arp packets\n"
"--log-ip6 : put ip6 info. in the log for ip6 packets\n"
, EBT_LOG_PREFIX_SIZE - 1);
for (i = 0; i < 8; i++)
printf("%d = %s\n", eight_priority[i].c_val,
eight_priority[i].c_name);
}
static void brlog_init(struct xt_entry_target *t)
{
struct ebt_log_info *loginfo = (struct ebt_log_info *)t->data;
loginfo->loglevel = LOG_NOTICE;
}
static void brlog_parse(struct xt_option_call *cb)
{
struct ebt_log_info *loginfo = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_LOG_IP:
case O_LOG_ARP:
case O_LOG_IP6:
loginfo->bitmask |= 1 << cb->entry->id;
break;
}
}
static void brlog_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
struct ebt_log_info *loginfo = (struct ebt_log_info *)target->data;
printf("--log-level %s", eight_priority[loginfo->loglevel].c_name);
if (loginfo->prefix[0])
printf(" --log-prefix \"%s\"", loginfo->prefix);
if (loginfo->bitmask & EBT_LOG_IP)
printf(" --log-ip");
if (loginfo->bitmask & EBT_LOG_ARP)
printf(" --log-arp");
if (loginfo->bitmask & EBT_LOG_IP6)
printf(" --log-ip6");
printf(" ");
}
static int brlog_xlate(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
const struct ebt_log_info *loginfo = (const void *)params->target->data;
xt_xlate_add(xl, "log");
if (loginfo->prefix[0])
xt_xlate_add(xl, " prefix \"%s\"", loginfo->prefix);
if (loginfo->loglevel != LOG_DEFAULT_LEVEL)
xt_xlate_add(xl, " level %s", eight_priority[loginfo->loglevel].c_name);
/* ebt_log always decodes MAC header, nft_log always decodes upper header -
* so set flags ether and ignore EBT_LOG_IP, EBT_LOG_ARP and EBT_LOG_IP6 */
xt_xlate_add(xl, " flags ether ");
return 1;
}
static struct xtables_target brlog_target = {
.name = "log",
.revision = 0,
.ext_flags = XTABLES_EXT_WATCHER,
.version = XTABLES_VERSION,
.family = NFPROTO_BRIDGE,
.size = XT_ALIGN(sizeof(struct ebt_log_info)),
.userspacesize = XT_ALIGN(sizeof(struct ebt_log_info)),
.init = brlog_init,
.help = brlog_help,
.x6_parse = brlog_parse,
.print = brlog_print,
.xlate = brlog_xlate,
.x6_options = brlog_opts,
};
void _init(void)
{
xtables_register_target(&brlog_target);
}
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