net/ipv6/netfilter/nft_redir_ipv6.c

   1 /*
   2  * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/netlink.h>
  13 #include <linux/netfilter.h>
  14 #include <linux/netfilter/nf_tables.h>
  15 #include <net/netfilter/nf_tables.h>
  16 #include <net/netfilter/nf_nat.h>
  17 #include <net/netfilter/nft_redir.h>
  18 #include <net/netfilter/nf_nat_redirect.h>
  19
  20 static void nft_redir_ipv6_eval(const struct nft_expr *expr,
  21                                 struct nft_regs *regs,
  22                                 const struct nft_pktinfo *pkt)
  23 {
  24         struct nft_redir *priv = nft_expr_priv(expr);
  25         struct nf_nat_range range;
  26
  27         memset(&range, 0, sizeof(range));
  28         if (priv->sreg_proto_min) {
  29                 range.min_proto.all =
  30                         *(__be16 *)&regs->data[priv->sreg_proto_min],
  31                 range.max_proto.all =
  32                         *(__be16 *)&regs->data[priv->sreg_proto_max],
  33                 range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
  34         }
  35
  36         range.flags |= priv->flags;
  37
  38         regs->verdict.code = nf_nat_redirect_ipv6(pkt->skb, &range, pkt->hook);
  39 }
  40
  41 static struct nft_expr_type nft_redir_ipv6_type;
  42 static const struct nft_expr_ops nft_redir_ipv6_ops = {
  43         .type           = &nft_redir_ipv6_type,
  44         .size           = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
  45         .eval           = nft_redir_ipv6_eval,
  46         .init           = nft_redir_init,
  47         .dump           = nft_redir_dump,
  48         .validate       = nft_redir_validate,
  49 };
  50
  51 static struct nft_expr_type nft_redir_ipv6_type __read_mostly = {
  52         .family         = NFPROTO_IPV6,
  53         .name           = "redir",
  54         .ops            = &nft_redir_ipv6_ops,
  55         .policy         = nft_redir_policy,
  56         .maxattr        = NFTA_REDIR_MAX,
  57         .owner          = THIS_MODULE,
  58 };
  59
  60 static int __init nft_redir_ipv6_module_init(void)
  61 {
  62         return nft_register_expr(&nft_redir_ipv6_type);
  63 }
  64
  65 static void __exit nft_redir_ipv6_module_exit(void)
  66 {
  67         nft_unregister_expr(&nft_redir_ipv6_type);
  68 }
  69
  70 module_init(nft_redir_ipv6_module_init);
  71 module_exit(nft_redir_ipv6_module_exit);
  72
  73 MODULE_LICENSE("GPL");
  74 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
  75 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "redir");