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Linux/net/netfilter/nf_nat_tftp.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
  3  */
  4 
  5 #include <linux/module.h>
  6 #include <linux/udp.h>
  7 
  8 #include <net/netfilter/nf_conntrack_helper.h>
  9 #include <net/netfilter/nf_conntrack_expect.h>
 10 #include <net/netfilter/nf_nat_helper.h>
 11 #include <linux/netfilter/nf_conntrack_tftp.h>
 12 
 13 #define NAT_HELPER_NAME "tftp"
 14 
 15 MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
 16 MODULE_DESCRIPTION("TFTP NAT helper");
 17 MODULE_LICENSE("GPL");
 18 MODULE_ALIAS_NF_NAT_HELPER(NAT_HELPER_NAME);
 19 
 20 static struct nf_conntrack_nat_helper nat_helper_tftp =
 21         NF_CT_NAT_HELPER_INIT(NAT_HELPER_NAME);
 22 
 23 static unsigned int help(struct sk_buff *skb,
 24                          enum ip_conntrack_info ctinfo,
 25                          struct nf_conntrack_expect *exp)
 26 {
 27         const struct nf_conn *ct = exp->master;
 28 
 29         exp->saved_proto.udp.port
 30                 = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
 31         exp->dir = IP_CT_DIR_REPLY;
 32         exp->expectfn = nf_nat_follow_master;
 33         if (nf_ct_expect_related(exp, 0) != 0) {
 34                 nf_ct_helper_log(skb, exp->master, "cannot add expectation");
 35                 return NF_DROP;
 36         }
 37         return NF_ACCEPT;
 38 }
 39 
 40 static void __exit nf_nat_tftp_fini(void)
 41 {
 42         nf_nat_helper_unregister(&nat_helper_tftp);
 43         RCU_INIT_POINTER(nf_nat_tftp_hook, NULL);
 44         synchronize_rcu();
 45 }
 46 
 47 static int __init nf_nat_tftp_init(void)
 48 {
 49         BUG_ON(nf_nat_tftp_hook != NULL);
 50         nf_nat_helper_register(&nat_helper_tftp);
 51         RCU_INIT_POINTER(nf_nat_tftp_hook, help);
 52         return 0;
 53 }
 54 
 55 module_init(nf_nat_tftp_init);
 56 module_exit(nf_nat_tftp_fini);
 57 

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