linux/net/netfilter/xt_nfacct.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org>
   4 * (C) 2011 Intra2net AG <https://www.intra2net.com>
   5 */
   6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8#include <linux/module.h>
   9#include <linux/skbuff.h>
  10
  11#include <linux/netfilter/x_tables.h>
  12#include <linux/netfilter/nfnetlink_acct.h>
  13#include <linux/netfilter/xt_nfacct.h>
  14
  15MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  16MODULE_DESCRIPTION("Xtables: match for the extended accounting infrastructure");
  17MODULE_LICENSE("GPL");
  18MODULE_ALIAS("ipt_nfacct");
  19MODULE_ALIAS("ip6t_nfacct");
  20
  21static bool nfacct_mt(const struct sk_buff *skb, struct xt_action_param *par)
  22{
  23        int overquota;
  24        const struct xt_nfacct_match_info *info = par->targinfo;
  25
  26        nfnl_acct_update(skb, info->nfacct);
  27
  28        overquota = nfnl_acct_overquota(xt_net(par), info->nfacct);
  29
  30        return overquota != NFACCT_UNDERQUOTA;
  31}
  32
  33static int
  34nfacct_mt_checkentry(const struct xt_mtchk_param *par)
  35{
  36        struct xt_nfacct_match_info *info = par->matchinfo;
  37        struct nf_acct *nfacct;
  38
  39        nfacct = nfnl_acct_find_get(par->net, info->name);
  40        if (nfacct == NULL) {
  41                pr_info_ratelimited("accounting object `%s' does not exists\n",
  42                                    info->name);
  43                return -ENOENT;
  44        }
  45        info->nfacct = nfacct;
  46        return 0;
  47}
  48
  49static void
  50nfacct_mt_destroy(const struct xt_mtdtor_param *par)
  51{
  52        const struct xt_nfacct_match_info *info = par->matchinfo;
  53
  54        nfnl_acct_put(info->nfacct);
  55}
  56
  57static struct xt_match nfacct_mt_reg[] __read_mostly = {
  58        {
  59                .name       = "nfacct",
  60                .revision   = 0,
  61                .family     = NFPROTO_UNSPEC,
  62                .checkentry = nfacct_mt_checkentry,
  63                .match      = nfacct_mt,
  64                .destroy    = nfacct_mt_destroy,
  65                .matchsize  = sizeof(struct xt_nfacct_match_info),
  66                .usersize   = offsetof(struct xt_nfacct_match_info, nfacct),
  67                .me         = THIS_MODULE,
  68        },
  69        {
  70                .name       = "nfacct",
  71                .revision   = 1,
  72                .family     = NFPROTO_UNSPEC,
  73                .checkentry = nfacct_mt_checkentry,
  74                .match      = nfacct_mt,
  75                .destroy    = nfacct_mt_destroy,
  76                .matchsize  = sizeof(struct xt_nfacct_match_info_v1),
  77                .usersize   = offsetof(struct xt_nfacct_match_info_v1, nfacct),
  78                .me         = THIS_MODULE,
  79        },
  80};
  81
  82static int __init nfacct_mt_init(void)
  83{
  84        return xt_register_matches(nfacct_mt_reg, ARRAY_SIZE(nfacct_mt_reg));
  85}
  86
  87static void __exit nfacct_mt_exit(void)
  88{
  89        xt_unregister_matches(nfacct_mt_reg, ARRAY_SIZE(nfacct_mt_reg));
  90}
  91
  92module_init(nfacct_mt_init);
  93module_exit(nfacct_mt_exit);
  94