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/* This kernel module matches connection mark values set by the * CONNMARK target * * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> * by Henrik Nordstrom <hno@marasystems.com> * * 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> MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>"); MODULE_DESCRIPTION("IP tables connmark match module"); MODULE_LICENSE("GPL"); #include <linux/netfilter_ipv4/ip_tables.h> #include <linux/netfilter_ipv4/ipt_connmark.h> #include <linux/netfilter_ipv4/ip_conntrack.h> static int match(const struct sk_buff *skb, const struct net_device *in, const struct net_device *out, const void *matchinfo, int offset, int *hotdrop) { const struct ipt_connmark_info *info = matchinfo; enum ip_conntrack_info ctinfo; struct ip_conntrack *ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo); if (!ct) return 0; return ((ct->mark & info->mask) == info->mark) ^ info->invert; } static int checkentry(const char *tablename, const struct ipt_ip *ip, void *matchinfo, unsigned int matchsize, unsigned int hook_mask) { if (matchsize != IPT_ALIGN(sizeof(struct ipt_connmark_info))) return 0; return 1; } static struct ipt_match connmark_match = { .name = "connmark", .match = &match, .checkentry = &checkentry, .me = THIS_MODULE }; static int __init init(void) { return ipt_register_match(&connmark_match); } static void __exit fini(void) { ipt_unregister_match(&connmark_match); } module_init(init); module_exit(fini); |