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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> | |
be2861dc | 13 | #include <net/netfilter/nf_tables_offload.h> |
502061f8 PNA |
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 | ||
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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 | ||
be2861dc PNA |
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 | ||
502061f8 PNA |
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, | |
be2861dc | 77 | .offload = nft_dup_netdev_offload, |
502061f8 PNA |
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"); |