Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv4 / netfilter / arptable_filter.c

diff --git a/kernel/net/ipv4/netfilter/arptable_filter.c b/kernel/net/ipv4/netfilter/arptable_filter.c
new file mode 100644 (file)
index 0000000..93876d0
--- /dev/null
+++ b/kernel/net/ipv4/netfilter/arptable_filter.c
@@ -0,0 +1,91 @@
+/*
+ * Filtering ARP tables module.
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_arp/arp_tables.h>
+#include <linux/slab.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
+MODULE_DESCRIPTION("arptables filter table");
+
+#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT) | \
+                          (1 << NF_ARP_FORWARD))
+
+static const struct xt_table packet_filter = {
+       .name           = "filter",
+       .valid_hooks    = FILTER_VALID_HOOKS,
+       .me             = THIS_MODULE,
+       .af             = NFPROTO_ARP,
+       .priority       = NF_IP_PRI_FILTER,
+};
+
+/* The work comes in here from netfilter.c */
+static unsigned int
+arptable_filter_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
+                    const struct nf_hook_state *state)
+{
+       const struct net *net = dev_net(state->in ? state->in : state->out);
+
+       return arpt_do_table(skb, ops->hooknum, state,
+                            net->ipv4.arptable_filter);
+}
+
+static struct nf_hook_ops *arpfilter_ops __read_mostly;
+
+static int __net_init arptable_filter_net_init(struct net *net)
+{
+       struct arpt_replace *repl;
+       
+       repl = arpt_alloc_initial_table(&packet_filter);
+       if (repl == NULL)
+               return -ENOMEM;
+       net->ipv4.arptable_filter =
+               arpt_register_table(net, &packet_filter, repl);
+       kfree(repl);
+       return PTR_ERR_OR_ZERO(net->ipv4.arptable_filter);
+}
+
+static void __net_exit arptable_filter_net_exit(struct net *net)
+{
+       arpt_unregister_table(net->ipv4.arptable_filter);
+}
+
+static struct pernet_operations arptable_filter_net_ops = {
+       .init = arptable_filter_net_init,
+       .exit = arptable_filter_net_exit,
+};
+
+static int __init arptable_filter_init(void)
+{
+       int ret;
+
+       ret = register_pernet_subsys(&arptable_filter_net_ops);
+       if (ret < 0)
+               return ret;
+
+       arpfilter_ops = xt_hook_link(&packet_filter, arptable_filter_hook);
+       if (IS_ERR(arpfilter_ops)) {
+               ret = PTR_ERR(arpfilter_ops);
+               goto cleanup_table;
+       }
+       return ret;
+
+cleanup_table:
+       unregister_pernet_subsys(&arptable_filter_net_ops);
+       return ret;
+}
+
+static void __exit arptable_filter_fini(void)
+{
+       xt_hook_unlink(&packet_filter, arpfilter_ops);
+       unregister_pernet_subsys(&arptable_filter_net_ops);
+}
+
+module_init(arptable_filter_init);
+module_exit(arptable_filter_fini);