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/*
* "quota2" match extension for iptables
* Sam Johnston <samj [at] samj net>
* Jan Engelhardt <jengelh [at] medozas de>, 2008
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <getopt.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xtables.h>
#include <linux/netfilter/xt_quota2.h>
enum {
FL_QUOTA = 1 << 0,
FL_NAME = 1 << 1,
FL_GROW = 1 << 2,
FL_PACKET = 1 << 3,
FL_NO_CHANGE = 1 << 4,
};
enum {
O_QUOTA = 0,
O_NAME,
O_GROW,
O_PACKET,
O_NO_CHANGE,
};
static const struct xt_option_entry quota_mt2_opts[] = {
{.name = "grow", .id = O_GROW, .type = XTTYPE_NONE},
{.name = "no-change", .id = O_NO_CHANGE, .type = XTTYPE_NONE},
{.name = "name", .id = O_NAME, .type = XTTYPE_STRING,
.flags = XTOPT_PUT, XTOPT_POINTER(struct xt_quota_mtinfo2, name)},
{.name = "quota", .id = O_QUOTA, .type = XTTYPE_UINT64,
.flags = XTOPT_INVERT | XTOPT_PUT,
XTOPT_POINTER(struct xt_quota_mtinfo2, quota)},
{.name = "packets", .id = O_PACKET, .type = XTTYPE_NONE},
XTOPT_TABLEEND,
};
static void quota_mt2_help(void)
{
printf(
"quota match options:\n"
" --grow provide an increasing counter\n"
" --no-change never change counter/quota value for matching packets\n"
" --name name name for the file in sysfs\n"
"[!] --quota quota initial quota (bytes or packets)\n"
" --packets count packets instead of bytes\n"
);
}
static void quota_mt2_parse(struct xt_option_call *cb)
{
struct xt_quota_mtinfo2 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_GROW:
info->flags |= XT_QUOTA_GROW;
break;
case O_NO_CHANGE:
info->flags |= XT_QUOTA_NO_CHANGE;
break;
case O_NAME:
break;
case O_PACKET:
info->flags |= XT_QUOTA_PACKET;
break;
case O_QUOTA:
if (cb->invert)
info->flags |= XT_QUOTA_INVERT;
break;
}
}
static void
quota_mt2_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_quota_mtinfo2 *q = (void *)match->data;
if (q->flags & XT_QUOTA_INVERT)
printf(" !");
if (q->flags & XT_QUOTA_GROW)
printf(" --grow ");
if (q->flags & XT_QUOTA_NO_CHANGE)
printf(" --no-change ");
if (q->flags & XT_QUOTA_PACKET)
printf(" --packets ");
if (*q->name != '\0')
printf(" --name %s ", q->name);
printf(" --quota %llu ", (unsigned long long)q->quota);
}
static void quota_mt2_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_quota_mtinfo2 *q = (const void *)match->data;
if (q->flags & XT_QUOTA_INVERT)
printf(" !");
if (q->flags & XT_QUOTA_GROW)
printf(" counter");
else
printf(" quota");
if (*q->name != '\0')
printf(" %s:", q->name);
printf(" %llu ", (unsigned long long)q->quota);
if (q->flags & XT_QUOTA_PACKET)
printf("packets ");
else
printf("bytes ");
if (q->flags & XT_QUOTA_NO_CHANGE)
printf("(no-change mode) ");
}
static struct xtables_match quota_mt2_reg = {
.family = NFPROTO_UNSPEC,
.revision = 3,
.name = "quota2",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof (struct xt_quota_mtinfo2)),
.userspacesize = offsetof(struct xt_quota_mtinfo2, quota),
.help = quota_mt2_help,
.x6_parse = quota_mt2_parse,
.print = quota_mt2_print,
.save = quota_mt2_save,
.x6_options = quota_mt2_opts,
};
void _init(void)
{
xtables_register_match("a_mt2_reg);
}
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