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/* Shared library add-on to iptables for NFQ
*
* (C) 2005 by Harald Welte <laforge@netfilter.org>
*
* This program is distributed under the terms of GNU GPL v2, 1991
*
*/
#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter/xt_NFQUEUE.h>
enum {
O_QUEUE_NUM = 0,
O_QUEUE_BALANCE,
O_QUEUE_BYPASS,
F_QUEUE_NUM = 1 << O_QUEUE_NUM,
F_QUEUE_BALANCE = 1 << O_QUEUE_BALANCE,
};
static void NFQUEUE_help(void)
{
printf(
"NFQUEUE target options\n"
" --queue-num value Send packet to QUEUE number <value>.\n"
" Valid queue numbers are 0-65535\n"
);
}
static void NFQUEUE_help_v1(void)
{
NFQUEUE_help();
printf(
" --queue-balance first:last Balance flows between queues <value> to <value>.\n");
}
static void NFQUEUE_help_v2(void)
{
NFQUEUE_help_v1();
printf(
" --queue-bypass Bypass Queueing if no queue instance exists.\n");
}
#define s struct xt_NFQ_info
static const struct xt_option_entry NFQUEUE_opts[] = {
{.name = "queue-num", .id = O_QUEUE_NUM, .type = XTTYPE_UINT16,
.flags = XTOPT_PUT, XTOPT_POINTER(s, queuenum),
.excl = F_QUEUE_BALANCE},
{.name = "queue-balance", .id = O_QUEUE_BALANCE,
.type = XTTYPE_UINT16RC, .excl = F_QUEUE_NUM},
{.name = "queue-bypass", .id = O_QUEUE_BYPASS, .type = XTTYPE_NONE},
XTOPT_TABLEEND,
};
#undef s
static void NFQUEUE_parse(struct xt_option_call *cb)
{
xtables_option_parse(cb);
if (cb->entry->id == O_QUEUE_BALANCE)
xtables_error(PARAMETER_PROBLEM, "NFQUEUE target: "
"--queue-balance not supported (kernel too old?)");
}
static void NFQUEUE_parse_v1(struct xt_option_call *cb)
{
struct xt_NFQ_info_v1 *info = cb->data;
const uint16_t *r = cb->val.u16_range;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_QUEUE_BALANCE:
if (cb->nvals != 2)
xtables_error(PARAMETER_PROBLEM,
"Bad range \"%s\"", cb->arg);
if (r[0] >= r[1])
xtables_error(PARAMETER_PROBLEM, "%u should be less than %u",
r[0], r[1]);
info->queuenum = r[0];
info->queues_total = r[1] - r[0] + 1;
break;
}
}
static void NFQUEUE_parse_v2(struct xt_option_call *cb)
{
struct xt_NFQ_info_v2 *info = cb->data;
NFQUEUE_parse_v1(cb);
switch (cb->entry->id) {
case O_QUEUE_BYPASS:
info->bypass = 1;
break;
}
}
static void NFQUEUE_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_NFQ_info *tinfo =
(const struct xt_NFQ_info *)target->data;
printf(" NFQUEUE num %u", tinfo->queuenum);
}
static void NFQUEUE_print_v1(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_NFQ_info_v1 *tinfo = (const void *)target->data;
unsigned int last = tinfo->queues_total;
if (last > 1) {
last += tinfo->queuenum - 1;
printf(" NFQUEUE balance %u:%u", tinfo->queuenum, last);
} else {
printf(" NFQUEUE num %u", tinfo->queuenum);
}
}
static void NFQUEUE_print_v2(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_NFQ_info_v2 *info = (void *) target->data;
NFQUEUE_print_v1(ip, target, numeric);
if (info->bypass)
printf(" bypass");
}
static void NFQUEUE_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_NFQ_info *tinfo =
(const struct xt_NFQ_info *)target->data;
printf(" --queue-num %u", tinfo->queuenum);
}
static void NFQUEUE_save_v1(const void *ip, const struct xt_entry_target *target)
{
const struct xt_NFQ_info_v1 *tinfo = (const void *)target->data;
unsigned int last = tinfo->queues_total;
if (last > 1) {
last += tinfo->queuenum - 1;
printf(" --queue-balance %u:%u", tinfo->queuenum, last);
} else {
printf(" --queue-num %u", tinfo->queuenum);
}
}
static void NFQUEUE_save_v2(const void *ip, const struct xt_entry_target *target)
{
const struct xt_NFQ_info_v2 *info = (void *) target->data;
NFQUEUE_save_v1(ip, target);
if (info->bypass)
printf("--queue-bypass ");
}
static void NFQUEUE_init_v1(struct xt_entry_target *t)
{
struct xt_NFQ_info_v1 *tinfo = (void *)t->data;
tinfo->queues_total = 1;
}
static struct xtables_target nfqueue_targets[] = {
{
.family = NFPROTO_UNSPEC,
.name = "NFQUEUE",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_NFQ_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_NFQ_info)),
.help = NFQUEUE_help,
.print = NFQUEUE_print,
.save = NFQUEUE_save,
.x6_parse = NFQUEUE_parse,
.x6_options = NFQUEUE_opts
},{
.family = NFPROTO_UNSPEC,
.revision = 1,
.name = "NFQUEUE",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_NFQ_info_v1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_NFQ_info_v1)),
.help = NFQUEUE_help_v1,
.init = NFQUEUE_init_v1,
.print = NFQUEUE_print_v1,
.save = NFQUEUE_save_v1,
.x6_parse = NFQUEUE_parse_v1,
.x6_options = NFQUEUE_opts,
},{
.family = NFPROTO_UNSPEC,
.revision = 2,
.name = "NFQUEUE",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_NFQ_info_v2)),
.userspacesize = XT_ALIGN(sizeof(struct xt_NFQ_info_v2)),
.help = NFQUEUE_help_v2,
.init = NFQUEUE_init_v1,
.print = NFQUEUE_print_v2,
.save = NFQUEUE_save_v2,
.x6_parse = NFQUEUE_parse_v2,
.x6_options = NFQUEUE_opts,
}
};
void _init(void)
{
xtables_register_targets(nfqueue_targets, ARRAY_SIZE(nfqueue_targets));
}
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