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502061f8 PNA |
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 | ||
18 | struct nft_dup_netdev { | |
19 | enum nft_registers sreg_dev:8; | |
20 | }; | |
21 | ||
22 | static 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 | ||
32 | static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = { | |
33 | [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 }, | |
34 | }; | |
35 | ||
36 | static 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 | ||
49 | static const struct nft_expr_ops nft_dup_netdev_ingress_ops; | |
50 | ||
51 | static 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 | ||
60 | nla_put_failure: | |
61 | return -1; | |
62 | } | |
63 | ||
64 | static struct nft_expr_type nft_dup_netdev_type; | |
65 | static 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 | ||
73 | static 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 | ||
82 | static int __init nft_dup_netdev_module_init(void) | |
83 | { | |
84 | return nft_register_expr(&nft_dup_netdev_type); | |
85 | } | |
86 | ||
87 | static void __exit nft_dup_netdev_module_exit(void) | |
88 | { | |
89 | nft_unregister_expr(&nft_dup_netdev_type); | |
90 | } | |
91 | ||
92 | module_init(nft_dup_netdev_module_init); | |
93 | module_exit(nft_dup_netdev_module_exit); | |
94 | ||
95 | MODULE_LICENSE("GPL"); | |
96 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
97 | MODULE_ALIAS_NFT_AF_EXPR(5, "dup"); |