1 files changed, 96 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/iptable_raw.c b/net/ipv4/netfilter/iptable_raw.c
new file mode 100644
index 00000000..07fb710c
--- /dev/null
+++ b/net/ipv4/netfilter/iptable_raw.c
@@ -0,0 +1,96 @@
+/*
+ * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
+ *
+ * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/slab.h>
+#include <net/ip.h>
+
+#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
+
+static const struct xt_table packet_raw = {
+	.name = "raw",
+	.valid_hooks =  RAW_VALID_HOOKS,
+	.me = THIS_MODULE,
+	.af = NFPROTO_IPV4,
+	.priority = NF_IP_PRI_RAW,
+};
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+iptable_raw_hook(unsigned int hook, struct sk_buff *skb,
+		 const struct net_device *in, const struct net_device *out,
+		 int (*okfn)(struct sk_buff *))
+{
+	const struct net *net;
+
+	if (hook == NF_INET_LOCAL_OUT && 
+	    (skb->len < sizeof(struct iphdr) ||
+	     ip_hdrlen(skb) < sizeof(struct iphdr)))
+		/* root is playing with raw sockets. */
+		return NF_ACCEPT;
+
+	net = dev_net((in != NULL) ? in : out);
+	return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_raw);
+}
+
+static struct nf_hook_ops *rawtable_ops __read_mostly;
+
+static int __net_init iptable_raw_net_init(struct net *net)
+{
+	struct ipt_replace *repl;
+
+	repl = ipt_alloc_initial_table(&packet_raw);
+	if (repl == NULL)
+		return -ENOMEM;
+	net->ipv4.iptable_raw =
+		ipt_register_table(net, &packet_raw, repl);
+	kfree(repl);
+	if (IS_ERR(net->ipv4.iptable_raw))
+		return PTR_ERR(net->ipv4.iptable_raw);
+	return 0;
+}
+
+static void __net_exit iptable_raw_net_exit(struct net *net)
+{
+	ipt_unregister_table(net, net->ipv4.iptable_raw);
+}
+
+static struct pernet_operations iptable_raw_net_ops = {
+	.init = iptable_raw_net_init,
+	.exit = iptable_raw_net_exit,
+};
+
+static int __init iptable_raw_init(void)
+{
+	int ret;
+
+	ret = register_pernet_subsys(&iptable_raw_net_ops);
+	if (ret < 0)
+		return ret;
+
+	/* Register hooks */
+	rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook);
+	if (IS_ERR(rawtable_ops)) {
+		ret = PTR_ERR(rawtable_ops);
+		goto cleanup_table;
+	}
+
+	return ret;
+
+ cleanup_table:
+	unregister_pernet_subsys(&iptable_raw_net_ops);
+	return ret;
+}
+
+static void __exit iptable_raw_fini(void)
+{
+	xt_hook_unlink(&packet_raw, rawtable_ops);
+	unregister_pernet_subsys(&iptable_raw_net_ops);
+}
+
+module_init(iptable_raw_init);
+module_exit(iptable_raw_fini);
+MODULE_LICENSE("GPL");