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#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <xtables.h>
#include <linux/netfilter_ipv6/ip6t_LOG.h>
#ifndef IP6T_LOG_UID /* Old kernel */
#define IP6T_LOG_UID 0x08
#undef IP6T_LOG_MASK
#define IP6T_LOG_MASK 0x0f
#endif
#define LOG_DEFAULT_LEVEL LOG_WARNING
enum {
O_LOG_LEVEL = 0,
O_LOG_PREFIX,
O_LOG_TCPSEQ,
O_LOG_TCPOPTS,
O_LOG_IPOPTS,
O_LOG_UID,
O_LOG_MAC,
};
static void LOG_help(void)
{
printf(
"LOG target options:\n"
" --log-level level Level of logging (numeric or see syslog.conf)\n"
" --log-prefix prefix Prefix log messages with this prefix.\n"
" --log-tcp-sequence Log TCP sequence numbers.\n"
" --log-tcp-options Log TCP options.\n"
" --log-ip-options Log IP options.\n"
" --log-uid Log UID owning the local socket.\n"
" --log-macdecode Decode MAC addresses and protocol.\n");
}
#define s struct ip6t_log_info
static const struct xt_option_entry LOG_opts[] = {
{.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
.flags = XTOPT_PUT, XTOPT_POINTER(s, level)},
{.name = "log-prefix", .id = O_LOG_PREFIX, .type = XTTYPE_STRING,
.flags = XTOPT_PUT, XTOPT_POINTER(s, prefix), .min = 1},
{.name = "log-tcp-sequence", .id = O_LOG_TCPSEQ, .type = XTTYPE_NONE},
{.name = "log-tcp-options", .id = O_LOG_TCPOPTS, .type = XTTYPE_NONE},
{.name = "log-ip-options", .id = O_LOG_IPOPTS, .type = XTTYPE_NONE},
{.name = "log-uid", .id = O_LOG_UID, .type = XTTYPE_NONE},
{.name = "log-macdecode", .id = O_LOG_MAC, .type = XTTYPE_NONE},
XTOPT_TABLEEND,
};
#undef s
static void LOG_init(struct xt_entry_target *t)
{
struct ip6t_log_info *loginfo = (struct ip6t_log_info *)t->data;
loginfo->level = LOG_DEFAULT_LEVEL;
}
struct ip6t_log_names {
const char *name;
unsigned int level;
};
static const struct ip6t_log_names ip6t_log_names[]
= { { .name = "alert", .level = LOG_ALERT },
{ .name = "crit", .level = LOG_CRIT },
{ .name = "debug", .level = LOG_DEBUG },
{ .name = "emerg", .level = LOG_EMERG },
{ .name = "error", .level = LOG_ERR }, /* DEPRECATED */
{ .name = "info", .level = LOG_INFO },
{ .name = "notice", .level = LOG_NOTICE },
{ .name = "panic", .level = LOG_EMERG }, /* DEPRECATED */
{ .name = "warning", .level = LOG_WARNING }
};
static void LOG_parse(struct xt_option_call *cb)
{
struct ip6t_log_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_LOG_PREFIX:
if (strchr(cb->arg, '\n') != NULL)
xtables_error(PARAMETER_PROBLEM,
"Newlines not allowed in --log-prefix");
break;
case O_LOG_TCPSEQ:
info->logflags |= IP6T_LOG_TCPSEQ;
break;
case O_LOG_TCPOPTS:
info->logflags |= IP6T_LOG_TCPOPT;
break;
case O_LOG_IPOPTS:
info->logflags |= IP6T_LOG_IPOPT;
break;
case O_LOG_UID:
info->logflags |= IP6T_LOG_UID;
break;
case O_LOG_MAC:
info->logflags |= IP6T_LOG_MACDECODE;
break;
}
}
static void LOG_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct ip6t_log_info *loginfo
= (const struct ip6t_log_info *)target->data;
unsigned int i = 0;
printf(" LOG");
if (numeric)
printf(" flags %u level %u",
loginfo->logflags, loginfo->level);
else {
for (i = 0; i < ARRAY_SIZE(ip6t_log_names); ++i)
if (loginfo->level == ip6t_log_names[i].level) {
printf(" level %s", ip6t_log_names[i].name);
break;
}
if (i == ARRAY_SIZE(ip6t_log_names))
printf(" UNKNOWN level %u", loginfo->level);
if (loginfo->logflags & IP6T_LOG_TCPSEQ)
printf(" tcp-sequence");
if (loginfo->logflags & IP6T_LOG_TCPOPT)
printf(" tcp-options");
if (loginfo->logflags & IP6T_LOG_IPOPT)
printf(" ip-options");
if (loginfo->logflags & IP6T_LOG_UID)
printf(" uid");
if (loginfo->logflags & IP6T_LOG_MACDECODE)
printf(" macdecode");
if (loginfo->logflags & ~(IP6T_LOG_MASK))
printf(" unknown-flags");
}
if (strcmp(loginfo->prefix, "") != 0)
printf(" prefix \"%s\"", loginfo->prefix);
}
static void LOG_save(const void *ip, const struct xt_entry_target *target)
{
const struct ip6t_log_info *loginfo
= (const struct ip6t_log_info *)target->data;
if (strcmp(loginfo->prefix, "") != 0) {
printf(" --log-prefix");
xtables_save_string(loginfo->prefix);
}
if (loginfo->level != LOG_DEFAULT_LEVEL)
printf(" --log-level %d", loginfo->level);
if (loginfo->logflags & IP6T_LOG_TCPSEQ)
printf(" --log-tcp-sequence");
if (loginfo->logflags & IP6T_LOG_TCPOPT)
printf(" --log-tcp-options");
if (loginfo->logflags & IP6T_LOG_IPOPT)
printf(" --log-ip-options");
if (loginfo->logflags & IP6T_LOG_UID)
printf(" --log-uid");
if (loginfo->logflags & IP6T_LOG_MACDECODE)
printf(" --log-macdecode");
}
static struct xtables_target log_tg6_reg = {
.name = "LOG",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct ip6t_log_info)),
.userspacesize = XT_ALIGN(sizeof(struct ip6t_log_info)),
.help = LOG_help,
.init = LOG_init,
.print = LOG_print,
.save = LOG_save,
.x6_parse = LOG_parse,
.x6_options = LOG_opts,
};
void _init(void)
{
xtables_register_target(&log_tg6_reg);
}
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