patch-2.4.19 linux-2.4.19/net/ipv4/netfilter/arptable_filter.c
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- 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");
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