110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/* This kernel module matches connection mark values set by the
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* CONNMARK target
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*
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* Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
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* by Henrik Nordstrom <hno@marasystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
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MODULE_DESCRIPTION("IP tables connmark match module");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_connmark");
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_connmark.h>
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#include <net/netfilter/nf_conntrack_compat.h>
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop)
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{
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const struct xt_connmark_info *info = matchinfo;
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u_int32_t ctinfo;
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const u_int32_t *ctmark = nf_ct_get_mark(skb, &ctinfo);
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if (!ctmark)
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return 0;
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return (((*ctmark) & info->mask) == info->mark) ^ info->invert;
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}
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static int
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checkentry(const char *tablename,
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const void *ip,
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void *matchinfo,
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unsigned int matchsize,
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unsigned int hook_mask)
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{
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struct xt_connmark_info *cm =
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(struct xt_connmark_info *)matchinfo;
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if (matchsize != XT_ALIGN(sizeof(struct xt_connmark_info)))
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return 0;
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if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) {
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printk(KERN_WARNING "connmark: only support 32bit mark\n");
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return 0;
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}
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return 1;
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}
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static struct xt_match connmark_match = {
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.name = "connmark",
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.match = &match,
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.checkentry = &checkentry,
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.me = THIS_MODULE
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};
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static struct xt_match connmark6_match = {
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.name = "connmark",
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.match = &match,
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.checkentry = &checkentry,
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.me = THIS_MODULE
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};
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static int __init init(void)
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{
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int ret;
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need_conntrack();
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ret = xt_register_match(AF_INET, &connmark_match);
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if (ret)
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return ret;
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ret = xt_register_match(AF_INET6, &connmark6_match);
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if (ret)
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xt_unregister_match(AF_INET, &connmark_match);
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return ret;
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}
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static void __exit fini(void)
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{
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xt_unregister_match(AF_INET6, &connmark6_match);
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xt_unregister_match(AF_INET, &connmark_match);
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}
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module_init(init);
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module_exit(fini);
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