![Patrick McHardy](/assets/img/avatar_default.png)
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
2 KiB
C
86 lines
2 KiB
C
/* Kernel module to match connection tracking information. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <net/netfilter/nf_conntrack_compat.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_state.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
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MODULE_DESCRIPTION("ip[6]_tables connection tracking state match module");
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MODULE_ALIAS("ipt_state");
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MODULE_ALIAS("ip6t_state");
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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 struct xt_match *match,
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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_state_info *sinfo = matchinfo;
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enum ip_conntrack_info ctinfo;
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unsigned int statebit;
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if (nf_ct_is_untracked(skb))
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statebit = XT_STATE_UNTRACKED;
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else if (!nf_ct_get_ctinfo(skb, &ctinfo))
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statebit = XT_STATE_INVALID;
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else
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statebit = XT_STATE_BIT(ctinfo);
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return (sinfo->statemask & statebit);
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}
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static struct xt_match state_match = {
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.name = "state",
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.match = match,
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.matchsize = sizeof(struct xt_state_info),
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.me = THIS_MODULE,
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};
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static struct xt_match state6_match = {
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.name = "state",
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.match = match,
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.matchsize = sizeof(struct xt_state_info),
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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, &state_match);
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if (ret < 0)
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return ret;
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ret = xt_register_match(AF_INET6, &state6_match);
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if (ret < 0)
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xt_unregister_match(AF_INET,&state_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_INET, &state_match);
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xt_unregister_match(AF_INET6, &state6_match);
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}
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module_init(init);
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module_exit(fini);
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