| /* |
| * (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org> |
| * (C) 2011 Intra2net AG <http://www.intra2net.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 (or any |
| * later at your option) as published by the Free Software Foundation. |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| |
| #include <linux/netfilter/x_tables.h> |
| #include <linux/netfilter/nfnetlink_acct.h> |
| #include <linux/netfilter/xt_nfacct.h> |
| |
| MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| MODULE_DESCRIPTION("Xtables: match for the extended accounting infrastructure"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("ipt_nfacct"); |
| MODULE_ALIAS("ip6t_nfacct"); |
| |
| static bool nfacct_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| { |
| int overquota; |
| const struct xt_nfacct_match_info *info = par->targinfo; |
| |
| nfnl_acct_update(skb, info->nfacct); |
| |
| overquota = nfnl_acct_overquota(xt_net(par), skb, info->nfacct); |
| |
| return overquota == NFACCT_UNDERQUOTA ? false : true; |
| } |
| |
| static int |
| nfacct_mt_checkentry(const struct xt_mtchk_param *par) |
| { |
| struct xt_nfacct_match_info *info = par->matchinfo; |
| struct nf_acct *nfacct; |
| |
| nfacct = nfnl_acct_find_get(par->net, info->name); |
| if (nfacct == NULL) { |
| pr_info_ratelimited("accounting object `%s' does not exists\n", |
| info->name); |
| return -ENOENT; |
| } |
| info->nfacct = nfacct; |
| return 0; |
| } |
| |
| static void |
| nfacct_mt_destroy(const struct xt_mtdtor_param *par) |
| { |
| const struct xt_nfacct_match_info *info = par->matchinfo; |
| |
| nfnl_acct_put(info->nfacct); |
| } |
| |
| static struct xt_match nfacct_mt_reg __read_mostly = { |
| .name = "nfacct", |
| .family = NFPROTO_UNSPEC, |
| .checkentry = nfacct_mt_checkentry, |
| .match = nfacct_mt, |
| .destroy = nfacct_mt_destroy, |
| .matchsize = sizeof(struct xt_nfacct_match_info), |
| .usersize = offsetof(struct xt_nfacct_match_info, nfacct), |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init nfacct_mt_init(void) |
| { |
| return xt_register_match(&nfacct_mt_reg); |
| } |
| |
| static void __exit nfacct_mt_exit(void) |
| { |
| xt_unregister_match(&nfacct_mt_reg); |
| } |
| |
| module_init(nfacct_mt_init); |
| module_exit(nfacct_mt_exit); |