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Linux/net/ipv6/netfilter/nft_masq_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_masq.h>
 18 #include <net/netfilter/ipv6/nf_nat_masquerade.h>
 19 
 20 static void nft_masq_ipv6_eval(const struct nft_expr *expr,
 21                                struct nft_regs *regs,
 22                                const struct nft_pktinfo *pkt)
 23 {
 24         struct nft_masq *priv = nft_expr_priv(expr);
 25         struct nf_nat_range range;
 26 
 27         memset(&range, 0, sizeof(range));
 28         range.flags = priv->flags;
 29 
 30         regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range, pkt->out);
 31 }
 32 
 33 static struct nft_expr_type nft_masq_ipv6_type;
 34 static const struct nft_expr_ops nft_masq_ipv6_ops = {
 35         .type           = &nft_masq_ipv6_type,
 36         .size           = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
 37         .eval           = nft_masq_ipv6_eval,
 38         .init           = nft_masq_init,
 39         .dump           = nft_masq_dump,
 40         .validate       = nft_masq_validate,
 41 };
 42 
 43 static struct nft_expr_type nft_masq_ipv6_type __read_mostly = {
 44         .family         = NFPROTO_IPV6,
 45         .name           = "masq",
 46         .ops            = &nft_masq_ipv6_ops,
 47         .policy         = nft_masq_policy,
 48         .maxattr        = NFTA_MASQ_MAX,
 49         .owner          = THIS_MODULE,
 50 };
 51 
 52 static int __init nft_masq_ipv6_module_init(void)
 53 {
 54         int ret;
 55 
 56         ret = nft_register_expr(&nft_masq_ipv6_type);
 57         if (ret < 0)
 58                 return ret;
 59 
 60         nf_nat_masquerade_ipv6_register_notifier();
 61 
 62         return ret;
 63 }
 64 
 65 static void __exit nft_masq_ipv6_module_exit(void)
 66 {
 67         nft_unregister_expr(&nft_masq_ipv6_type);
 68         nf_nat_masquerade_ipv6_unregister_notifier();
 69 }
 70 
 71 module_init(nft_masq_ipv6_module_init);
 72 module_exit(nft_masq_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, "masq");
 77 

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