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- /*
- * NetBIOS name service broadcast connection tracking helper
- *
- * (c) 2005 Patrick McHardy <kaber@trash.net>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- /*
- * This helper tracks locally originating NetBIOS name service
- * requests by issuing permanent expectations (valid until
- * timing out) matching all reply connections from the
- * destination network. The only NetBIOS specific thing is
- * actually the port number.
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/in.h>
- #include <net/netfilter/nf_conntrack.h>
- #include <net/netfilter/nf_conntrack_helper.h>
- #include <net/netfilter/nf_conntrack_expect.h>
- #define NMBD_PORT 137
- MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
- MODULE_DESCRIPTION("NetBIOS name service broadcast connection tracking helper");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("ip_conntrack_netbios_ns");
- MODULE_ALIAS_NFCT_HELPER("netbios_ns");
- static unsigned int timeout __read_mostly = 3;
- module_param(timeout, uint, S_IRUSR);
- MODULE_PARM_DESC(timeout, "timeout for master connection/replies in seconds");
- static struct nf_conntrack_expect_policy exp_policy = {
- .max_expected = 1,
- };
- static int netbios_ns_help(struct sk_buff *skb, unsigned int protoff,
- struct nf_conn *ct, enum ip_conntrack_info ctinfo)
- {
- return nf_conntrack_broadcast_help(skb, protoff, ct, ctinfo, timeout);
- }
- static struct nf_conntrack_helper helper __read_mostly = {
- .name = "netbios-ns",
- .tuple.src.l3num = NFPROTO_IPV4,
- .tuple.src.u.udp.port = cpu_to_be16(NMBD_PORT),
- .tuple.dst.protonum = IPPROTO_UDP,
- .me = THIS_MODULE,
- .help = netbios_ns_help,
- .expect_policy = &exp_policy,
- };
- static int __init nf_conntrack_netbios_ns_init(void)
- {
- exp_policy.timeout = timeout;
- return nf_conntrack_helper_register(&helper);
- }
- static void __exit nf_conntrack_netbios_ns_fini(void)
- {
- nf_conntrack_helper_unregister(&helper);
- }
- module_init(nf_conntrack_netbios_ns_init);
- module_exit(nf_conntrack_netbios_ns_fini);
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