![Jan Engelhardt](/assets/img/avatar_default.png)
Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/* This is a module which is used for setting up fake conntracks
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* on packets so that they are not seen by the conntrack/NAT code.
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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 <linux/netfilter/x_tables.h>
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#include <net/netfilter/nf_conntrack.h>
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MODULE_DESCRIPTION("Xtables: Disabling connection tracking for packets");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_NOTRACK");
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MODULE_ALIAS("ip6t_NOTRACK");
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static unsigned int
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notrack_tg(struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, unsigned int hooknum,
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const struct xt_target *target, const void *targinfo)
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{
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/* Previously seen (loopback)? Ignore. */
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if (skb->nfct != NULL)
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return XT_CONTINUE;
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/* Attach fake conntrack entry.
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If there is a real ct entry correspondig to this packet,
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it'll hang aroun till timing out. We don't deal with it
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for performance reasons. JK */
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skb->nfct = &nf_conntrack_untracked.ct_general;
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skb->nfctinfo = IP_CT_NEW;
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nf_conntrack_get(skb->nfct);
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return XT_CONTINUE;
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}
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static struct xt_target notrack_tg_reg[] __read_mostly = {
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{
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.name = "NOTRACK",
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.family = NFPROTO_IPV4,
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.target = notrack_tg,
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.table = "raw",
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.me = THIS_MODULE,
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},
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{
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.name = "NOTRACK",
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.family = NFPROTO_IPV6,
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.target = notrack_tg,
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.table = "raw",
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.me = THIS_MODULE,
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},
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};
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static int __init notrack_tg_init(void)
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{
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return xt_register_targets(notrack_tg_reg, ARRAY_SIZE(notrack_tg_reg));
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}
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static void __exit notrack_tg_exit(void)
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{
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xt_unregister_targets(notrack_tg_reg, ARRAY_SIZE(notrack_tg_reg));
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}
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module_init(notrack_tg_init);
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module_exit(notrack_tg_exit);
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