X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fnetfilter%2Fnf_conntrack_netbios_ns.c;fp=net%2Fnetfilter%2Fnf_conntrack_netbios_ns.c;h=2a48efdf0d6764bc85bf3b2bb0e6cadc4171ccf6;hb=76828883507a47dae78837ab5dec5a5b4513c667;hp=0000000000000000000000000000000000000000;hpb=64ba3f394c830ec48a1c31b53dcae312c56f1604;p=linux-2.6.git

diff --git a/net/netfilter/nf_conntrack_netbios_ns.c b/net/netfilter/nf_conntrack_netbios_ns.c
new file mode 100644
index 000000000..2a48efdf0
--- /dev/null
+++ b/net/netfilter/nf_conntrack_netbios_ns.c
@@ -0,0 +1,127 @@
+/*
+ *      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/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/if_addr.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <net/route.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");
+
+static unsigned int timeout __read_mostly = 3;
+module_param(timeout, uint, 0400);
+MODULE_PARM_DESC(timeout, "timeout for master connection/replies in seconds");
+
+static int help(struct sk_buff **pskb, unsigned int protoff,
+                struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+{
+	struct nf_conntrack_expect *exp;
+	struct iphdr *iph = (*pskb)->nh.iph;
+	struct rtable *rt = (struct rtable *)(*pskb)->dst;
+	struct in_device *in_dev;
+	__be32 mask = 0;
+
+	/* we're only interested in locally generated packets */
+	if ((*pskb)->sk == NULL)
+		goto out;
+	if (rt == NULL || !(rt->rt_flags & RTCF_BROADCAST))
+		goto out;
+	if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
+		goto out;
+
+	rcu_read_lock();
+	in_dev = __in_dev_get_rcu(rt->u.dst.dev);
+	if (in_dev != NULL) {
+		for_primary_ifa(in_dev) {
+			if (ifa->ifa_broadcast == iph->daddr) {
+				mask = ifa->ifa_mask;
+				break;
+			}
+		} endfor_ifa(in_dev);
+	}
+	rcu_read_unlock();
+
+	if (mask == 0)
+		goto out;
+
+	exp = nf_conntrack_expect_alloc(ct);
+	if (exp == NULL)
+		goto out;
+
+	exp->tuple                = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+	exp->tuple.src.u.udp.port = htons(NMBD_PORT);
+
+	exp->mask.src.u3.ip       = mask;
+	exp->mask.src.u.udp.port  = htons(0xFFFF);
+	exp->mask.dst.u3.ip       = htonl(0xFFFFFFFF);
+	exp->mask.dst.u.udp.port  = htons(0xFFFF);
+	exp->mask.dst.protonum    = 0xFF;
+
+	exp->expectfn             = NULL;
+	exp->flags                = NF_CT_EXPECT_PERMANENT;
+	exp->helper               = NULL;
+
+	nf_conntrack_expect_related(exp);
+	nf_conntrack_expect_put(exp);
+
+	nf_ct_refresh(ct, *pskb, timeout * HZ);
+out:
+	return NF_ACCEPT;
+}
+
+static struct nf_conntrack_helper helper __read_mostly = {
+	.name			= "netbios-ns",
+	.tuple.src.l3num	= AF_INET,
+	.tuple.src.u.udp.port	= __constant_htons(NMBD_PORT),
+	.tuple.dst.protonum	= IPPROTO_UDP,
+	.mask.src.l3num		= 0xFFFF,
+	.mask.src.u.udp.port	= __constant_htons(0xFFFF),
+	.mask.dst.protonum	= 0xFF,
+	.max_expected		= 1,
+	.me			= THIS_MODULE,
+	.help			= help,
+};
+
+static int __init nf_conntrack_netbios_ns_init(void)
+{
+	helper.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);