LXR linux/net/netfilter/nft_dup

   1/*
   2 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
   3 *
   4 * This program is free software; you can redistribute it and/or modify it
   5 * under the terms of the GNU General Public License version 2 as published by
   6 * 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_dup_netdev.h>
  17
  18struct nft_dup_netdev {
  19        enum nft_registers      sreg_dev:8;
  20};
  21
  22static void nft_dup_netdev_eval(const struct nft_expr *expr,
  23                                struct nft_regs *regs,
  24                                const struct nft_pktinfo *pkt)
  25{
  26        struct nft_dup_netdev *priv = nft_expr_priv(expr);
  27        int oif = regs->data[priv->sreg_dev];
  28
  29        nf_dup_netdev_egress(pkt, oif);
  30}
  31
  32static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = {
  33        [NFTA_DUP_SREG_DEV]     = { .type = NLA_U32 },
  34};
  35
  36static int nft_dup_netdev_init(const struct nft_ctx *ctx,
  37                               const struct nft_expr *expr,
  38                               const struct nlattr * const tb[])
  39{
  40        struct nft_dup_netdev *priv = nft_expr_priv(expr);
  41
  42        if (tb[NFTA_DUP_SREG_DEV] == NULL)
  43                return -EINVAL;
  44
  45        priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
  46        return nft_validate_register_load(priv->sreg_dev, sizeof(int));
  47}
  48
  49static const struct nft_expr_ops nft_dup_netdev_ingress_ops;
  50
  51static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
  52{
  53        struct nft_dup_netdev *priv = nft_expr_priv(expr);
  54
  55        if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
  56                goto nla_put_failure;
  57
  58        return 0;
  59
  60nla_put_failure:
  61        return -1;
  62}
  63
  64static struct nft_expr_type nft_dup_netdev_type;
  65static const struct nft_expr_ops nft_dup_netdev_ops = {
  66        .type           = &nft_dup_netdev_type,
  67        .size           = NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)),
  68        .eval           = nft_dup_netdev_eval,
  69        .init           = nft_dup_netdev_init,
  70        .dump           = nft_dup_netdev_dump,
  71};
  72
  73static struct nft_expr_type nft_dup_netdev_type __read_mostly = {
  74        .family         = NFPROTO_NETDEV,
  75        .name           = "dup",
  76        .ops            = &nft_dup_netdev_ops,
  77        .policy         = nft_dup_netdev_policy,
  78        .maxattr        = NFTA_DUP_MAX,
  79        .owner          = THIS_MODULE,
  80};
  81
  82static int __init nft_dup_netdev_module_init(void)
  83{
  84        return nft_register_expr(&nft_dup_netdev_type);
  85}
  86
  87static void __exit nft_dup_netdev_module_exit(void)
  88{
  89        nft_unregister_expr(&nft_dup_netdev_type);
  90}
  91
  92module_init(nft_dup_netdev_module_init);
  93module_exit(nft_dup_netdev_module_exit);
  94
  95MODULE_LICENSE("GPL");
  96MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  97MODULE_ALIAS_NFT_AF_EXPR(5, "dup");
  98