Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv4 / netfilter / nft_redir_ipv4.c

diff --git a/kernel/net/ipv4/netfilter/nft_redir_ipv4.c b/kernel/net/ipv4/netfilter/nft_redir_ipv4.c
new file mode 100644 (file)
index 0000000..d8d795d
--- /dev/null
+++ b/kernel/net/ipv4/netfilter/nft_redir_ipv4.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_redirect.h>
+#include <net/netfilter/nft_redir.h>
+
+static void nft_redir_ipv4_eval(const struct nft_expr *expr,
+                               struct nft_regs *regs,
+                               const struct nft_pktinfo *pkt)
+{
+       struct nft_redir *priv = nft_expr_priv(expr);
+       struct nf_nat_ipv4_multi_range_compat mr;
+
+       memset(&mr, 0, sizeof(mr));
+       if (priv->sreg_proto_min) {
+               mr.range[0].min.all =
+                       *(__be16 *)&regs->data[priv->sreg_proto_min];
+               mr.range[0].max.all =
+                       *(__be16 *)&regs->data[priv->sreg_proto_max];
+               mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+       }
+
+       mr.range[0].flags |= priv->flags;
+
+       regs->verdict.code = nf_nat_redirect_ipv4(pkt->skb, &mr,
+                                                 pkt->ops->hooknum);
+}
+
+static struct nft_expr_type nft_redir_ipv4_type;
+static const struct nft_expr_ops nft_redir_ipv4_ops = {
+       .type           = &nft_redir_ipv4_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
+       .eval           = nft_redir_ipv4_eval,
+       .init           = nft_redir_init,
+       .dump           = nft_redir_dump,
+       .validate       = nft_redir_validate,
+};
+
+static struct nft_expr_type nft_redir_ipv4_type __read_mostly = {
+       .family         = NFPROTO_IPV4,
+       .name           = "redir",
+       .ops            = &nft_redir_ipv4_ops,
+       .policy         = nft_redir_policy,
+       .maxattr        = NFTA_REDIR_MAX,
+       .owner          = THIS_MODULE,
+};
+
+static int __init nft_redir_ipv4_module_init(void)
+{
+       return nft_register_expr(&nft_redir_ipv4_type);
+}
+
+static void __exit nft_redir_ipv4_module_exit(void)
+{
+       nft_unregister_expr(&nft_redir_ipv4_type);
+}
+
+module_init(nft_redir_ipv4_module_init);
+module_exit(nft_redir_ipv4_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "redir");