LXR linux/net/ipv6/netfilter/nft_masq

   1/*
   2 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
   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
  20static 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        if (priv->sreg_proto_min) {
  30                range.min_proto.all = (__force __be16)nft_reg_load16(
  31                        &regs->data[priv->sreg_proto_min]);
  32                range.max_proto.all = (__force __be16)nft_reg_load16(
  33                        &regs->data[priv->sreg_proto_max]);
  34        }
  35        regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
  36                                                    nft_out(pkt));
  37}
  38
  39static void
  40nft_masq_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
  41{
  42        nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
  43}
  44
  45static struct nft_expr_type nft_masq_ipv6_type;
  46static const struct nft_expr_ops nft_masq_ipv6_ops = {
  47        .type           = &nft_masq_ipv6_type,
  48        .size           = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
  49        .eval           = nft_masq_ipv6_eval,
  50        .init           = nft_masq_init,
  51        .destroy        = nft_masq_ipv6_destroy,
  52        .dump           = nft_masq_dump,
  53        .validate       = nft_masq_validate,
  54};
  55
  56static struct nft_expr_type nft_masq_ipv6_type __read_mostly = {
  57        .family         = NFPROTO_IPV6,
  58        .name           = "masq",
  59        .ops            = &nft_masq_ipv6_ops,
  60        .policy         = nft_masq_policy,
  61        .maxattr        = NFTA_MASQ_MAX,
  62        .owner          = THIS_MODULE,
  63};
  64
  65static int __init nft_masq_ipv6_module_init(void)
  66{
  67        int ret;
  68
  69        ret = nft_register_expr(&nft_masq_ipv6_type);
  70        if (ret < 0)
  71                return ret;
  72
  73        nf_nat_masquerade_ipv6_register_notifier();
  74
  75        return ret;
  76}
  77
  78static void __exit nft_masq_ipv6_module_exit(void)
  79{
  80        nft_unregister_expr(&nft_masq_ipv6_type);
  81        nf_nat_masquerade_ipv6_unregister_notifier();
  82}
  83
  84module_init(nft_masq_ipv6_module_init);
  85module_exit(nft_masq_ipv6_module_exit);
  86
  87MODULE_LICENSE("GPL");
  88MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
  89MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "masq");
  90