dm thin: wake worker when discard is prepared
[linux-2.6.git] / net / netfilter / nf_nat_tftp.c
blobccabbda71a3e5ca0e893dc03bdd48816d4560503
1 /* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 as
5 * published by the Free Software Foundation.
6 */
8 #include <linux/module.h>
9 #include <linux/udp.h>
11 #include <net/netfilter/nf_conntrack_helper.h>
12 #include <net/netfilter/nf_conntrack_expect.h>
13 #include <net/netfilter/nf_nat_helper.h>
14 #include <linux/netfilter/nf_conntrack_tftp.h>
16 MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
17 MODULE_DESCRIPTION("TFTP NAT helper");
18 MODULE_LICENSE("GPL");
19 MODULE_ALIAS("ip_nat_tftp");
21 static unsigned int help(struct sk_buff *skb,
22 enum ip_conntrack_info ctinfo,
23 struct nf_conntrack_expect *exp)
25 const struct nf_conn *ct = exp->master;
27 exp->saved_proto.udp.port
28 = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
29 exp->dir = IP_CT_DIR_REPLY;
30 exp->expectfn = nf_nat_follow_master;
31 if (nf_ct_expect_related(exp) != 0)
32 return NF_DROP;
33 return NF_ACCEPT;
36 static void __exit nf_nat_tftp_fini(void)
38 RCU_INIT_POINTER(nf_nat_tftp_hook, NULL);
39 synchronize_rcu();
42 static int __init nf_nat_tftp_init(void)
44 BUG_ON(nf_nat_tftp_hook != NULL);
45 RCU_INIT_POINTER(nf_nat_tftp_hook, help);
46 return 0;
49 module_init(nf_nat_tftp_init);
50 module_exit(nf_nat_tftp_fini);