Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_REDIRECT.c

diff --git a/kernel/net/netfilter/xt_REDIRECT.c b/kernel/net/netfilter/xt_REDIRECT.c
new file mode 100644 (file)
index 0000000..03f0b37
--- /dev/null
+++ b/kernel/net/netfilter/xt_REDIRECT.c
@@ -0,0 +1,113 @@
+/*
+ * (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ * Copyright (c) 2011 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 version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6
+ * NAT funded by Astaro.
+ */
+
+#include <linux/if.h>
+#include <linux/inetdevice.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/types.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/x_tables.h>
+#include <net/addrconf.h>
+#include <net/checksum.h>
+#include <net/protocol.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_redirect.h>
+
+static unsigned int
+redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       return nf_nat_redirect_ipv6(skb, par->targinfo, par->hooknum);
+}
+
+static int redirect_tg6_checkentry(const struct xt_tgchk_param *par)
+{
+       const struct nf_nat_range *range = par->targinfo;
+
+       if (range->flags & NF_NAT_RANGE_MAP_IPS)
+               return -EINVAL;
+       return 0;
+}
+
+/* FIXME: Take multiple ranges --RR */
+static int redirect_tg4_check(const struct xt_tgchk_param *par)
+{
+       const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
+
+       if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) {
+               pr_debug("bad MAP_IPS.\n");
+               return -EINVAL;
+       }
+       if (mr->rangesize != 1) {
+               pr_debug("bad rangesize %u.\n", mr->rangesize);
+               return -EINVAL;
+       }
+       return 0;
+}
+
+static unsigned int
+redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       return nf_nat_redirect_ipv4(skb, par->targinfo, par->hooknum);
+}
+
+static struct xt_target redirect_tg_reg[] __read_mostly = {
+       {
+               .name       = "REDIRECT",
+               .family     = NFPROTO_IPV6,
+               .revision   = 0,
+               .table      = "nat",
+               .checkentry = redirect_tg6_checkentry,
+               .target     = redirect_tg6,
+               .targetsize = sizeof(struct nf_nat_range),
+               .hooks      = (1 << NF_INET_PRE_ROUTING) |
+                             (1 << NF_INET_LOCAL_OUT),
+               .me         = THIS_MODULE,
+       },
+       {
+               .name       = "REDIRECT",
+               .family     = NFPROTO_IPV4,
+               .revision   = 0,
+               .table      = "nat",
+               .target     = redirect_tg4,
+               .checkentry = redirect_tg4_check,
+               .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
+               .hooks      = (1 << NF_INET_PRE_ROUTING) |
+                             (1 << NF_INET_LOCAL_OUT),
+               .me         = THIS_MODULE,
+       },
+};
+
+static int __init redirect_tg_init(void)
+{
+       return xt_register_targets(redirect_tg_reg,
+                                  ARRAY_SIZE(redirect_tg_reg));
+}
+
+static void __exit redirect_tg_exit(void)
+{
+       xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg));
+}
+
+module_init(redirect_tg_init);
+module_exit(redirect_tg_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_DESCRIPTION("Xtables: Connection redirection to localhost");
+MODULE_ALIAS("ip6t_REDIRECT");
+MODULE_ALIAS("ipt_REDIRECT");