/net/netfilter/xt_connmark.c
https://gitlab.com/davod/ddfgdfgd · C · 87 lines · 54 code · 11 blank · 22 comment · 4 complexity · 61c72e1b20dc1e9ff96a1f9f9af9f7ab MD5 · raw file
- /*
- * xt_connmark - Netfilter module to match connection mark values
- *
- * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
- * by Henrik Nordstrom <hno@marasystems.com>
- * Copyright © CC Computer Consultants GmbH, 2007 - 2008
- * Jan Engelhardt <jengelh@computergmbh.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <net/netfilter/nf_conntrack.h>
- #include <linux/netfilter/x_tables.h>
- #include <linux/netfilter/xt_connmark.h>
- MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
- MODULE_DESCRIPTION("Xtables: connection mark match");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("ipt_connmark");
- MODULE_ALIAS("ip6t_connmark");
- static bool
- connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par)
- {
- const struct xt_connmark_mtinfo1 *info = par->matchinfo;
- enum ip_conntrack_info ctinfo;
- const struct nf_conn *ct;
- ct = nf_ct_get(skb, &ctinfo);
- if (ct == NULL)
- return false;
- return ((ct->mark & info->mask) == info->mark) ^ info->invert;
- }
- static bool connmark_mt_check(const struct xt_mtchk_param *par)
- {
- if (nf_ct_l3proto_try_module_get(par->family) < 0) {
- printk(KERN_WARNING "cannot load conntrack support for "
- "proto=%u\n", par->family);
- return false;
- }
- return true;
- }
- static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
- {
- nf_ct_l3proto_module_put(par->family);
- }
- static struct xt_match connmark_mt_reg __read_mostly = {
- .name = "connmark",
- .revision = 1,
- .family = NFPROTO_UNSPEC,
- .checkentry = connmark_mt_check,
- .match = connmark_mt,
- .matchsize = sizeof(struct xt_connmark_mtinfo1),
- .destroy = connmark_mt_destroy,
- .me = THIS_MODULE,
- };
- static int __init connmark_mt_init(void)
- {
- return xt_register_match(&connmark_mt_reg);
- }
- static void __exit connmark_mt_exit(void)
- {
- xt_unregister_match(&connmark_mt_reg);
- }
- module_init(connmark_mt_init);
- module_exit(connmark_mt_exit);