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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
502061f8 PNA |
2 | /* |
3 | * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> | |
502061f8 PNA |
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_dup_netdev.h> | |
14 | ||
15 | struct nft_dup_netdev { | |
16 | enum nft_registers sreg_dev:8; | |
17 | }; | |
18 | ||
19 | static void nft_dup_netdev_eval(const struct nft_expr *expr, | |
20 | struct nft_regs *regs, | |
21 | const struct nft_pktinfo *pkt) | |
22 | { | |
23 | struct nft_dup_netdev *priv = nft_expr_priv(expr); | |
24 | int oif = regs->data[priv->sreg_dev]; | |
25 | ||
26 | nf_dup_netdev_egress(pkt, oif); | |
27 | } | |
28 | ||
29 | static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = { | |
30 | [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 }, | |
31 | }; | |
32 | ||
33 | static int nft_dup_netdev_init(const struct nft_ctx *ctx, | |
34 | const struct nft_expr *expr, | |
35 | const struct nlattr * const tb[]) | |
36 | { | |
37 | struct nft_dup_netdev *priv = nft_expr_priv(expr); | |
38 | ||
39 | if (tb[NFTA_DUP_SREG_DEV] == NULL) | |
40 | return -EINVAL; | |
41 | ||
42 | priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]); | |
43 | return nft_validate_register_load(priv->sreg_dev, sizeof(int)); | |
44 | } | |
45 | ||
502061f8 PNA |
46 | static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr) |
47 | { | |
48 | struct nft_dup_netdev *priv = nft_expr_priv(expr); | |
49 | ||
50 | if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev)) | |
51 | goto nla_put_failure; | |
52 | ||
53 | return 0; | |
54 | ||
55 | nla_put_failure: | |
56 | return -1; | |
57 | } | |
58 | ||
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, | |
66 | }; | |
67 | ||
68 | static struct nft_expr_type nft_dup_netdev_type __read_mostly = { | |
69 | .family = NFPROTO_NETDEV, | |
70 | .name = "dup", | |
71 | .ops = &nft_dup_netdev_ops, | |
72 | .policy = nft_dup_netdev_policy, | |
73 | .maxattr = NFTA_DUP_MAX, | |
74 | .owner = THIS_MODULE, | |
75 | }; | |
76 | ||
77 | static int __init nft_dup_netdev_module_init(void) | |
78 | { | |
79 | return nft_register_expr(&nft_dup_netdev_type); | |
80 | } | |
81 | ||
82 | static void __exit nft_dup_netdev_module_exit(void) | |
83 | { | |
84 | nft_unregister_expr(&nft_dup_netdev_type); | |
85 | } | |
86 | ||
87 | module_init(nft_dup_netdev_module_init); | |
88 | module_exit(nft_dup_netdev_module_exit); | |
89 | ||
90 | MODULE_LICENSE("GPL"); | |
91 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
92 | MODULE_ALIAS_NFT_AF_EXPR(5, "dup"); |