Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org> |
| 3 | * (C) 2011 Intra2net AG <http://www.intra2net.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 (or any |
| 7 | * later at your option) as published by the Free Software Foundation. |
| 8 | */ |
Florian Westphal | b260664 | 2018-02-09 15:52:07 +0100 | [diff] [blame] | 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 10 | |
Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/skbuff.h> |
| 13 | |
| 14 | #include <linux/netfilter/x_tables.h> |
| 15 | #include <linux/netfilter/nfnetlink_acct.h> |
| 16 | #include <linux/netfilter/xt_nfacct.h> |
| 17 | |
| 18 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); |
| 19 | MODULE_DESCRIPTION("Xtables: match for the extended accounting infrastructure"); |
| 20 | MODULE_LICENSE("GPL"); |
| 21 | MODULE_ALIAS("ipt_nfacct"); |
| 22 | MODULE_ALIAS("ip6t_nfacct"); |
| 23 | |
| 24 | static bool nfacct_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| 25 | { |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 26 | int overquota; |
Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 27 | const struct xt_nfacct_match_info *info = par->targinfo; |
| 28 | |
| 29 | nfnl_acct_update(skb, info->nfacct); |
| 30 | |
Taehee Yoo | cceae76 | 2018-02-11 19:17:20 +0900 | [diff] [blame] | 31 | overquota = nfnl_acct_overquota(xt_net(par), info->nfacct); |
Mathieu Poirier | 683399e | 2014-04-20 18:57:36 -0600 | [diff] [blame] | 32 | |
| 33 | return overquota == NFACCT_UNDERQUOTA ? false : true; |
Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 34 | } |
| 35 | |
| 36 | static int |
| 37 | nfacct_mt_checkentry(const struct xt_mtchk_param *par) |
| 38 | { |
| 39 | struct xt_nfacct_match_info *info = par->matchinfo; |
| 40 | struct nf_acct *nfacct; |
| 41 | |
Andreas Schultz | 3499abb | 2015-08-05 17:51:45 +0200 | [diff] [blame] | 42 | nfacct = nfnl_acct_find_get(par->net, info->name); |
Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 43 | if (nfacct == NULL) { |
Florian Westphal | b260664 | 2018-02-09 15:52:07 +0100 | [diff] [blame] | 44 | pr_info_ratelimited("accounting object `%s' does not exists\n", |
| 45 | info->name); |
Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 46 | return -ENOENT; |
| 47 | } |
| 48 | info->nfacct = nfacct; |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | static void |
| 53 | nfacct_mt_destroy(const struct xt_mtdtor_param *par) |
| 54 | { |
| 55 | const struct xt_nfacct_match_info *info = par->matchinfo; |
| 56 | |
| 57 | nfnl_acct_put(info->nfacct); |
| 58 | } |
| 59 | |
Juliana Rodrigueiro | 4e5fbcb | 2019-08-16 17:02:22 +0200 | [diff] [blame] | 60 | static struct xt_match nfacct_mt_reg[] __read_mostly = { |
| 61 | { |
| 62 | .name = "nfacct", |
| 63 | .revision = 0, |
| 64 | .family = NFPROTO_UNSPEC, |
| 65 | .checkentry = nfacct_mt_checkentry, |
| 66 | .match = nfacct_mt, |
| 67 | .destroy = nfacct_mt_destroy, |
| 68 | .matchsize = sizeof(struct xt_nfacct_match_info), |
| 69 | .usersize = offsetof(struct xt_nfacct_match_info, nfacct), |
| 70 | .me = THIS_MODULE, |
| 71 | }, |
| 72 | { |
| 73 | .name = "nfacct", |
| 74 | .revision = 1, |
| 75 | .family = NFPROTO_UNSPEC, |
| 76 | .checkentry = nfacct_mt_checkentry, |
| 77 | .match = nfacct_mt, |
| 78 | .destroy = nfacct_mt_destroy, |
| 79 | .matchsize = sizeof(struct xt_nfacct_match_info_v1), |
| 80 | .usersize = offsetof(struct xt_nfacct_match_info_v1, nfacct), |
| 81 | .me = THIS_MODULE, |
| 82 | }, |
Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 83 | }; |
| 84 | |
| 85 | static int __init nfacct_mt_init(void) |
| 86 | { |
Juliana Rodrigueiro | 4e5fbcb | 2019-08-16 17:02:22 +0200 | [diff] [blame] | 87 | return xt_register_matches(nfacct_mt_reg, ARRAY_SIZE(nfacct_mt_reg)); |
Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | static void __exit nfacct_mt_exit(void) |
| 91 | { |
Juliana Rodrigueiro | 4e5fbcb | 2019-08-16 17:02:22 +0200 | [diff] [blame] | 92 | xt_unregister_matches(nfacct_mt_reg, ARRAY_SIZE(nfacct_mt_reg)); |
Pablo Neira Ayuso | ceb98d0 | 2011-12-23 14:28:59 +0100 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | module_init(nfacct_mt_init); |
| 96 | module_exit(nfacct_mt_exit); |