root/net/netfilter/nft_dup_netdev.c

DEFINITIONS

1. nft_dup_netdev_eval
2. nft_dup_netdev_init
3. nft_dup_netdev_dump
4. nft_dup_netdev_offload
5. nft_dup_netdev_module_init
6. nft_dup_netdev_module_exit

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
   4  */
   5 
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/module.h>
   9 #include <linux/netlink.h>
  10 #include <linux/netfilter.h>
  11 #include <linux/netfilter/nf_tables.h>
  12 #include <net/netfilter/nf_tables.h>
  13 #include <net/netfilter/nf_tables_offload.h>
  14 #include <net/netfilter/nf_dup_netdev.h>
  15 
  16 struct nft_dup_netdev {
  17         enum nft_registers      sreg_dev:8;
  18 };
  19 
  20 static void nft_dup_netdev_eval(const struct nft_expr *expr,
  21                                 struct nft_regs *regs,
  22                                 const struct nft_pktinfo *pkt)
  23 {
  24         struct nft_dup_netdev *priv = nft_expr_priv(expr);
  25         int oif = regs->data[priv->sreg_dev];
  26 
  27         nf_dup_netdev_egress(pkt, oif);
  28 }
  29 
  30 static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = {
  31         [NFTA_DUP_SREG_DEV]     = { .type = NLA_U32 },
  32 };
  33 
  34 static int nft_dup_netdev_init(const struct nft_ctx *ctx,
  35                                const struct nft_expr *expr,
  36                                const struct nlattr * const tb[])
  37 {
  38         struct nft_dup_netdev *priv = nft_expr_priv(expr);
  39 
  40         if (tb[NFTA_DUP_SREG_DEV] == NULL)
  41                 return -EINVAL;
  42 
  43         priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
  44         return nft_validate_register_load(priv->sreg_dev, sizeof(int));
  45 }
  46 
  47 static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
  48 {
  49         struct nft_dup_netdev *priv = nft_expr_priv(expr);
  50 
  51         if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
  52                 goto nla_put_failure;
  53 
  54         return 0;
  55 
  56 nla_put_failure:
  57         return -1;
  58 }
  59 
  60 static int nft_dup_netdev_offload(struct nft_offload_ctx *ctx,
  61                                   struct nft_flow_rule *flow,
  62                                   const struct nft_expr *expr)
  63 {
  64         const struct nft_dup_netdev *priv = nft_expr_priv(expr);
  65         int oif = ctx->regs[priv->sreg_dev].data.data[0];
  66 
  67         return nft_fwd_dup_netdev_offload(ctx, flow, FLOW_ACTION_MIRRED, oif);
  68 }
  69 
  70 static struct nft_expr_type nft_dup_netdev_type;
  71 static const struct nft_expr_ops nft_dup_netdev_ops = {
  72         .type           = &nft_dup_netdev_type,
  73         .size           = NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)),
  74         .eval           = nft_dup_netdev_eval,
  75         .init           = nft_dup_netdev_init,
  76         .dump           = nft_dup_netdev_dump,
  77         .offload        = nft_dup_netdev_offload,
  78 };
  79 
  80 static struct nft_expr_type nft_dup_netdev_type __read_mostly = {
  81         .family         = NFPROTO_NETDEV,
  82         .name           = "dup",
  83         .ops            = &nft_dup_netdev_ops,
  84         .policy         = nft_dup_netdev_policy,
  85         .maxattr        = NFTA_DUP_MAX,
  86         .owner          = THIS_MODULE,
  87 };
  88 
  89 static int __init nft_dup_netdev_module_init(void)
  90 {
  91         return nft_register_expr(&nft_dup_netdev_type);
  92 }
  93 
  94 static void __exit nft_dup_netdev_module_exit(void)
  95 {
  96         nft_unregister_expr(&nft_dup_netdev_type);
  97 }
  98 
  99 module_init(nft_dup_netdev_module_init);
 100 module_exit(nft_dup_netdev_module_exit);
 101 
 102 MODULE_LICENSE("GPL");
 103 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
 104 MODULE_ALIAS_NFT_AF_EXPR(5, "dup");