| 1 | /* |
| 2 | * xt_mark - Netfilter module to match NFMARK value |
| 3 | * |
| 4 | * (C) 1999-2001 Marc Boucher <marc@mbsi.ca> |
| 5 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
| 6 | * Jan Engelhardt <jengelh@medozas.de> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | |
| 16 | #include <linux/netfilter/xt_mark.h> |
| 17 | #include <linux/netfilter/x_tables.h> |
| 18 | |
| 19 | MODULE_LICENSE("GPL"); |
| 20 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
| 21 | MODULE_DESCRIPTION("Xtables: packet mark operations"); |
| 22 | MODULE_ALIAS("ipt_mark"); |
| 23 | MODULE_ALIAS("ip6t_mark"); |
| 24 | MODULE_ALIAS("ipt_MARK"); |
| 25 | MODULE_ALIAS("ip6t_MARK"); |
| 26 | |
| 27 | static unsigned int |
| 28 | mark_tg(struct sk_buff *skb, const struct xt_action_param *par) |
| 29 | { |
| 30 | const struct xt_mark_tginfo2 *info = par->targinfo; |
| 31 | |
| 32 | skb->mark = (skb->mark & ~info->mask) ^ info->mark; |
| 33 | return XT_CONTINUE; |
| 34 | } |
| 35 | |
| 36 | static bool |
| 37 | mark_mt(const struct sk_buff *skb, struct xt_action_param *par) |
| 38 | { |
| 39 | const struct xt_mark_mtinfo1 *info = par->matchinfo; |
| 40 | |
| 41 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; |
| 42 | } |
| 43 | |
| 44 | static struct xt_target mark_tg_reg __read_mostly = { |
| 45 | .name = "MARK", |
| 46 | .revision = 2, |
| 47 | .family = NFPROTO_UNSPEC, |
| 48 | .target = mark_tg, |
| 49 | .targetsize = sizeof(struct xt_mark_tginfo2), |
| 50 | .me = THIS_MODULE, |
| 51 | }; |
| 52 | |
| 53 | static struct xt_match mark_mt_reg __read_mostly = { |
| 54 | .name = "mark", |
| 55 | .revision = 1, |
| 56 | .family = NFPROTO_UNSPEC, |
| 57 | .match = mark_mt, |
| 58 | .matchsize = sizeof(struct xt_mark_mtinfo1), |
| 59 | .me = THIS_MODULE, |
| 60 | }; |
| 61 | |
| 62 | static int __init mark_mt_init(void) |
| 63 | { |
| 64 | int ret; |
| 65 | |
| 66 | ret = xt_register_target(&mark_tg_reg); |
| 67 | if (ret < 0) |
| 68 | return ret; |
| 69 | ret = xt_register_match(&mark_mt_reg); |
| 70 | if (ret < 0) { |
| 71 | xt_unregister_target(&mark_tg_reg); |
| 72 | return ret; |
| 73 | } |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static void __exit mark_mt_exit(void) |
| 78 | { |
| 79 | xt_unregister_match(&mark_mt_reg); |
| 80 | xt_unregister_target(&mark_tg_reg); |
| 81 | } |
| 82 | |
| 83 | module_init(mark_mt_init); |
| 84 | module_exit(mark_mt_exit); |