[NETFILTER]: nf_conntrack: add NetBIOS name service helper port

Add nf_conntrack port of the NetBIOS name service conntrack helper.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 145 insertions, 0 deletions

diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index bd50897d8fbb..d1a365d83c53 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -194,6 +194,25 @@ config NF_CONNTRACK_IRC
 
           To compile it as a module, choose M here.  If unsure, say N.
 
+config NF_CONNTRACK_NETBIOS_NS
+        tristate "NetBIOS name service protocol support (EXPERIMENTAL)"
+        depends on EXPERIMENTAL && NF_CONNTRACK
+        help
+          NetBIOS name service requests are sent as broadcast messages from an
+          unprivileged port and responded to with unicast messages to the
+          same port. This make them hard to firewall properly because connection
+          tracking doesn't deal with broadcasts. This helper tracks locally
+          originating NetBIOS name service requests and the corresponding
+          responses. It relies on correct IP address configuration, specifically
+          netmask and broadcast address. When properly configured, the output
+          of "ip address show" should look similar to this:
+
+          $ ip -4 address show eth0
+          4: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
+              inet 172.16.2.252/24 brd 172.16.2.255 scope global eth0
+
+          To compile it as a module, choose M here.  If unsure, say N.
+
 config NF_CT_NETLINK
         tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
         depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 343fd4896406..67144b2af647 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_NF_CONNTRACK_AMANDA) += nf_conntrack_amanda.o
 obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
 obj-$(CONFIG_NF_CONNTRACK_H323) += nf_conntrack_h323.o
 obj-$(CONFIG_NF_CONNTRACK_IRC) += nf_conntrack_irc.o
+obj-$(CONFIG_NF_CONNTRACK_NETBIOS_NS) += nf_conntrack_netbios_ns.o
 
 # generic X tables 
 obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/nf_conntrack_netbios_ns.c b/net/netfilter/nf_conntrack_netbios_ns.c
new file mode 100644
index 000000000000..4fad3ad0b886
--- /dev/null
+++ b/net/netfilter/nf_conntrack_netbios_ns.c
@@ -0,0 +1,125 @@
+/*
+ *      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 <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;
+
+        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);