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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 <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_NFQUEUE.h>
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");
}
static const struct option NFQUEUE_opts[] = {
{.name = "queue-num", .has_arg = true, .val = 'F'},
{.name = "queue-balance", .has_arg = true, .val = 'B'},
{.name = "queue-bypass", .has_arg = false,.val = 'P'},
XT_GETOPT_TABLEEND,
};
static void exit_badqueue(const char *s)
{
xtables_error(PARAMETER_PROBLEM, "Invalid queue number `%s'\n", s);
}
static void
parse_num(const char *s, struct xt_NFQ_info *tinfo)
{
unsigned int num;
if (!xtables_strtoui(s, NULL, &num, 0, UINT16_MAX))
exit_badqueue(s);
tinfo->queuenum = num;
}
static int
NFQUEUE_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_NFQ_info *tinfo
= (struct xt_NFQ_info *)(*target)->data;
switch (c) {
case 'F':
if (*flags)
xtables_error(PARAMETER_PROBLEM, "NFQUEUE target: "
"Only use --queue-num ONCE!");
parse_num(optarg, tinfo);
break;
case 'B':
xtables_error(PARAMETER_PROBLEM, "NFQUEUE target: "
"--queue-balance not supported (kernel too old?)");
}
return 1;
}
static int
NFQUEUE_parse_v1(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_NFQ_info_v1 *info = (void *)(*target)->data;
char *colon;
unsigned int firstqueue, lastqueue;
switch (c) {
case 'F': /* fallthrough */
case 'B':
if (*flags)
xtables_error(PARAMETER_PROBLEM, "NFQUEUE target: "
"Only use --queue-num ONCE!");
if (!xtables_strtoui(optarg, &colon, &firstqueue, 0, UINT16_MAX))
exit_badqueue(optarg);
info->queuenum = firstqueue;
if (c == 'F') {
if (*colon)
exit_badqueue(optarg);
break;
}
if (*colon != ':')
xtables_error(PARAMETER_PROBLEM, "Bad range \"%s\"", optarg);
if (!xtables_strtoui(colon + 1, NULL, &lastqueue, 1, UINT16_MAX))
exit_badqueue(optarg);
if (firstqueue >= lastqueue)
xtables_error(PARAMETER_PROBLEM, "%u should be less than %u",
firstqueue, lastqueue);
info->queues_total = lastqueue - firstqueue + 1;
break;
}
return 1;
}
static int
NFQUEUE_parse_v2(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
if (c == 'P') {
struct xt_NFQ_info_v2 *info = (void *)(*target)->data;
info->bypass = 1;
return 1;
}
return NFQUEUE_parse_v1(c, argv, invert, flags, entry, target);
}
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,
.parse = NFQUEUE_parse,
.print = NFQUEUE_print,
.save = NFQUEUE_save,
.extra_opts = 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,
.parse = NFQUEUE_parse_v1,
.print = NFQUEUE_print_v1,
.save = NFQUEUE_save_v1,
.extra_opts = 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,
.parse = NFQUEUE_parse_v2,
.print = NFQUEUE_print_v2,
.save = NFQUEUE_save_v2,
.extra_opts = NFQUEUE_opts,
}
};
void _init(void)
{
xtables_register_targets(nfqueue_targets, ARRAY_SIZE(nfqueue_targets));
}
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