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net/netfilter/nf_nat_tftp.c
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/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/udp.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_nat_helper.h>
#include <linux/netfilter/nf_conntrack_tftp.h>
MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
MODULE_DESCRIPTION("TFTP NAT helper");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ip_nat_tftp");
static unsigned int help(struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
struct nf_conntrack_expect *exp)
{
const struct nf_conn *ct = exp->master;
exp->saved_proto.udp.port
= ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
exp->dir = IP_CT_DIR_REPLY;
exp->expectfn = nf_nat_follow_master;
if (nf_ct_expect_related(exp) != 0) {
nf_ct_helper_log(skb, exp->master, "cannot add expectation");
return NF_DROP;
}
return NF_ACCEPT;
}
static void __exit nf_nat_tftp_fini(void)
{
RCU_INIT_POINTER(nf_nat_tftp_hook, NULL);
synchronize_rcu();
}
static int __init nf_nat_tftp_init(void)
{
BUG_ON(nf_nat_tftp_hook != NULL);
RCU_INIT_POINTER(nf_nat_tftp_hook, help);
return 0;
}
module_init(nf_nat_tftp_init);
module_exit(nf_nat_tftp_fini);
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