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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* NetBIOS name service broadcast connection tracking helper
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*
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* (c) 2005 Patrick McHardy <kaber@trash.net>
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*/
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/*
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* This helper tracks locally originating NetBIOS name service
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* requests by issuing permanent expectations (valid until
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* timing out) matching all reply connections from the
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* destination network. The only NetBIOS specific thing is
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* actually the port number.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/in.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#define NMBD_PORT 137
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_DESCRIPTION("NetBIOS name service broadcast connection tracking helper");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ip_conntrack_netbios_ns");
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MODULE_ALIAS_NFCT_HELPER("netbios_ns");
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static unsigned int timeout __read_mostly = 3;
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module_param(timeout, uint, 0400);
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MODULE_PARM_DESC(timeout, "timeout for master connection/replies in seconds");
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static struct nf_conntrack_expect_policy exp_policy = {
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.max_expected = 1,
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};
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static int netbios_ns_help(struct sk_buff *skb, unsigned int protoff,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo)
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{
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return nf_conntrack_broadcast_help(skb, ct, ctinfo, timeout);
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}
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static struct nf_conntrack_helper helper __read_mostly = {
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.name = "netbios-ns",
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.tuple.src.l3num = NFPROTO_IPV4,
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.tuple.src.u.udp.port = cpu_to_be16(NMBD_PORT),
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.tuple.dst.protonum = IPPROTO_UDP,
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.me = THIS_MODULE,
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.help = netbios_ns_help,
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.expect_policy = &exp_policy,
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};
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static int __init nf_conntrack_netbios_ns_init(void)
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{
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NF_CT_HELPER_BUILD_BUG_ON(0);
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exp_policy.timeout = timeout;
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return nf_conntrack_helper_register(&helper);
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}
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static void __exit nf_conntrack_netbios_ns_fini(void)
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{
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nf_conntrack_helper_unregister(&helper);
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}
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module_init(nf_conntrack_netbios_ns_init);
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module_exit(nf_conntrack_netbios_ns_fini);
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