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Linux/net/ipv6/netfilter/nft_redir_ipv6.c

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  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,
 39                                                   pkt->ops->hooknum);
 40 }
 41 
 42 static struct nft_expr_type nft_redir_ipv6_type;
 43 static const struct nft_expr_ops nft_redir_ipv6_ops = {
 44         .type           = &nft_redir_ipv6_type,
 45         .size           = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
 46         .eval           = nft_redir_ipv6_eval,
 47         .init           = nft_redir_init,
 48         .dump           = nft_redir_dump,
 49         .validate       = nft_redir_validate,
 50 };
 51 
 52 static struct nft_expr_type nft_redir_ipv6_type __read_mostly = {
 53         .family         = NFPROTO_IPV6,
 54         .name           = "redir",
 55         .ops            = &nft_redir_ipv6_ops,
 56         .policy         = nft_redir_policy,
 57         .maxattr        = NFTA_REDIR_MAX,
 58         .owner          = THIS_MODULE,
 59 };
 60 
 61 static int __init nft_redir_ipv6_module_init(void)
 62 {
 63         return nft_register_expr(&nft_redir_ipv6_type);
 64 }
 65 
 66 static void __exit nft_redir_ipv6_module_exit(void)
 67 {
 68         nft_unregister_expr(&nft_redir_ipv6_type);
 69 }
 70 
 71 module_init(nft_redir_ipv6_module_init);
 72 module_exit(nft_redir_ipv6_module_exit);
 73 
 74 MODULE_LICENSE("GPL");
 75 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
 76 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "redir");
 77 

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