patch-2.4.19 linux-2.4.19/net/ipv4/netfilter/arptable_filter.c

• Lines: 175
• Date: Fri Aug 2 17:39:46 2002
• Orig file: linux-2.4.18/net/ipv4/netfilter/arptable_filter.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/net/ipv4/netfilter/arptable_filter.c linux-2.4.19/net/ipv4/netfilter/arptable_filter.c
@@ -0,0 +1,174 @@
+/*
+ * Filtering ARP tables module.
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/netfilter_arp/arp_tables.h>
+
+#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT))
+
+/* Standard entry. */
+struct arpt_standard
+{
+	struct arpt_entry entry;
+	struct arpt_standard_target target;
+};
+
+struct arpt_error_target
+{
+	struct arpt_entry_target target;
+	char errorname[ARPT_FUNCTION_MAXNAMELEN];
+};
+
+struct arpt_error
+{
+	struct arpt_entry entry;
+	struct arpt_error_target target;
+};
+
+static struct
+{
+	struct arpt_replace repl;
+	struct arpt_standard entries[2];
+	struct arpt_error term;
+} initial_table __initdata
+= { { "filter", FILTER_VALID_HOOKS, 3,
+      sizeof(struct arpt_standard) * 2 + sizeof(struct arpt_error),
+      { [NF_ARP_IN] 0,
+	[NF_ARP_OUT] sizeof(struct arpt_standard) },
+      { [NF_ARP_IN] 0,
+	[NF_ARP_OUT] sizeof(struct arpt_standard), },
+      0, NULL, { } },
+    {
+	    /* ARP_IN */
+	    {
+		    {
+			    {
+				    { 0 }, { 0 }, { 0 }, { 0 },
+				    0, 0,
+				    { { 0, }, { 0, } },
+				    { { 0, }, { 0, } },
+				    0, 0,
+				    0, 0,
+				    0, 0,
+				    "", "", { 0 }, { 0 },
+				    0, 0
+			    },
+			    sizeof(struct arpt_entry),
+			    sizeof(struct arpt_standard),
+			    0,
+			    { 0, 0 }, { } },
+		    { { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
+		      -NF_ACCEPT - 1 }
+	    },
+	    /* ARP_OUT */
+	    {
+		    {
+			    {
+				    { 0 }, { 0 }, { 0 }, { 0 },
+				    0, 0,
+				    { { 0, }, { 0, } },
+				    { { 0, }, { 0, } },
+				    0, 0,
+				    0, 0,
+				    0, 0,
+				    "", "", { 0 }, { 0 },
+				    0, 0
+			    },
+			    sizeof(struct arpt_entry),
+			    sizeof(struct arpt_standard),
+			    0,
+			    { 0, 0 }, { } },
+		    { { { { ARPT_ALIGN(sizeof(struct arpt_standard_target)), "" } }, { } },
+		      -NF_ACCEPT - 1 }
+	    }
+    },
+    /* ERROR */
+    {
+	    {
+		    {
+			    { 0 }, { 0 }, { 0 }, { 0 },
+			    0, 0,
+			    { { 0, }, { 0, } },
+			    { { 0, }, { 0, } },
+			    0, 0,
+			    0, 0,
+			    0, 0,
+			    "", "", { 0 }, { 0 },
+			    0, 0
+		    },
+		    sizeof(struct arpt_entry),
+		    sizeof(struct arpt_error),
+		    0,
+		    { 0, 0 }, { } },
+	    { { { { ARPT_ALIGN(sizeof(struct arpt_error_target)), ARPT_ERROR_TARGET } },
+		{ } },
+	      "ERROR"
+	    }
+    }
+};
+
+static struct arpt_table packet_filter
+= { { NULL, NULL }, "filter", &initial_table.repl,
+    FILTER_VALID_HOOKS, RW_LOCK_UNLOCKED, NULL, THIS_MODULE };
+
+/* The work comes in here from netfilter.c */
+static unsigned int arpt_hook(unsigned int hook,
+			      struct sk_buff **pskb,
+			      const struct net_device *in,
+			      const struct net_device *out,
+			      int (*okfn)(struct sk_buff *))
+{
+	return arpt_do_table(pskb, hook, in, out, &packet_filter, NULL);
+}
+
+static struct nf_hook_ops arpt_ops[]
+= { { { NULL, NULL }, arpt_hook, NF_ARP, NF_ARP_IN, 0 },
+    { { NULL, NULL }, arpt_hook, NF_ARP, NF_ARP_OUT, 0 }
+};
+
+static int __init init(void)
+{
+	int ret;
+
+	/* Register table */
+	ret = arpt_register_table(&packet_filter);
+	if (ret < 0)
+		return ret;
+
+	/* Register hooks */
+	ret = nf_register_hook(&arpt_ops[0]);
+	if (ret < 0)
+		goto cleanup_table;
+
+	ret = nf_register_hook(&arpt_ops[1]);
+	if (ret < 0)
+		goto cleanup_hook0;
+
+	return ret;
+
+cleanup_hook0:
+	nf_unregister_hook(&arpt_ops[0]);
+
+cleanup_table:
+	arpt_unregister_table(&packet_filter);
+
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < sizeof(arpt_ops)/sizeof(struct nf_hook_ops); i++)
+		nf_unregister_hook(&arpt_ops[i]);
+
+	arpt_unregister_table(&packet_filter);
+}
+
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");