1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
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_dup_netdev.h>
15 struct nft_dup_netdev {
16 enum nft_registers sreg_dev:8;
19 static void nft_dup_netdev_eval(const struct nft_expr *expr,
20 struct nft_regs *regs,
21 const struct nft_pktinfo *pkt)
23 struct nft_dup_netdev *priv = nft_expr_priv(expr);
24 int oif = regs->data[priv->sreg_dev];
26 nf_dup_netdev_egress(pkt, oif);
29 static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = {
30 [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
33 static int nft_dup_netdev_init(const struct nft_ctx *ctx,
34 const struct nft_expr *expr,
35 const struct nlattr * const tb[])
37 struct nft_dup_netdev *priv = nft_expr_priv(expr);
39 if (tb[NFTA_DUP_SREG_DEV] == NULL)
42 priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
43 return nft_validate_register_load(priv->sreg_dev, sizeof(int));
46 static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
48 struct nft_dup_netdev *priv = nft_expr_priv(expr);
50 if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
59 static struct nft_expr_type nft_dup_netdev_type;
60 static const struct nft_expr_ops nft_dup_netdev_ops = {
61 .type = &nft_dup_netdev_type,
62 .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)),
63 .eval = nft_dup_netdev_eval,
64 .init = nft_dup_netdev_init,
65 .dump = nft_dup_netdev_dump,
68 static struct nft_expr_type nft_dup_netdev_type __read_mostly = {
69 .family = NFPROTO_NETDEV,
71 .ops = &nft_dup_netdev_ops,
72 .policy = nft_dup_netdev_policy,
73 .maxattr = NFTA_DUP_MAX,
77 static int __init nft_dup_netdev_module_init(void)
79 return nft_register_expr(&nft_dup_netdev_type);
82 static void __exit nft_dup_netdev_module_exit(void)
84 nft_unregister_expr(&nft_dup_netdev_type);
87 module_init(nft_dup_netdev_module_init);
88 module_exit(nft_dup_netdev_module_exit);
90 MODULE_LICENSE("GPL");
91 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
92 MODULE_ALIAS_NFT_AF_EXPR(5, "dup");