/*
 *      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);
ds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/decnet/netfilter/Makefile'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/decnet?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>decnet</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/decnet/netfilter?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>netfilter</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/decnet/netfilter/Makefile?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>Makefile</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='6989606a7224a2d5a925df22a49e4f7a0bfed0d6'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-05 23:06:06 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-05 23:06:06 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/decnet/netfilter/Makefile?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>6989606a7224a2d5a925df22a49e4f7a0bfed0d6</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/decnet/netfilter/Makefile?id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/decnet/netfilter/Makefile?h=nds-private-remove&amp;id=ed40875dd4b4c7b5c991db9e06c984180ab0b3ce'>ed40875dd4b4c7b5c991db9e06c984180ab0b3ce</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/decnet/netfilter/Makefile?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6&amp;id2=ed40875dd4b4c7b5c991db9e06c984180ab0b3ce'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/decnet/netfilter/Makefile?h=nds-private-remove&amp;id=be29d20f3f5db1f0b4e49a4f6eeedf840e2bf9b1'>be29d20f3f5db1f0b4e49a4f6eeedf840e2bf9b1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/decnet/netfilter/Makefile?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6&amp;id2=be29d20f3f5db1f0b4e49a4f6eeedf840e2bf9b1'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit</div><div class='commit-msg'>Pull audit fixes from Paul Moore:
 "Two small fixes relating to audit's use of fsnotify.

  The first patch plugs a leak and the second fixes some lock
  shenanigans. The patches are small and I banged on this for an
  afternoon with our testsuite and didn't see anything odd"

* 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit:
  audit: Fix sleep in atomic
  fsnotify: Remove fsnotify_duplicate_mark()
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=6989606a7224a2d5a925df22a49e4f7a0bfed0d6'>Diffstat</a> (limited to 'net/decnet/netfilter/Makefile')</div><table summary='diffstat' class='diffstat'>