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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d877f071 PNA |
2 | /* |
3 | * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org> | |
d877f071 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/ipv4/nf_dup_ipv4.h> | |
14 | ||
15 | struct nft_dup_ipv4 { | |
16 | enum nft_registers sreg_addr:8; | |
17 | enum nft_registers sreg_dev:8; | |
18 | }; | |
19 | ||
20 | static void nft_dup_ipv4_eval(const struct nft_expr *expr, | |
21 | struct nft_regs *regs, | |
22 | const struct nft_pktinfo *pkt) | |
23 | { | |
24 | struct nft_dup_ipv4 *priv = nft_expr_priv(expr); | |
25 | struct in_addr gw = { | |
59e26423 | 26 | .s_addr = (__force __be32)regs->data[priv->sreg_addr], |
d877f071 | 27 | }; |
b73b8a1b | 28 | int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1; |
d877f071 | 29 | |
0e5a1c7e | 30 | nf_dup_ipv4(nft_net(pkt), pkt->skb, nft_hook(pkt), &gw, oif); |
d877f071 PNA |
31 | } |
32 | ||
33 | static int nft_dup_ipv4_init(const struct nft_ctx *ctx, | |
34 | const struct nft_expr *expr, | |
35 | const struct nlattr * const tb[]) | |
36 | { | |
37 | struct nft_dup_ipv4 *priv = nft_expr_priv(expr); | |
38 | int err; | |
39 | ||
40 | if (tb[NFTA_DUP_SREG_ADDR] == NULL) | |
41 | return -EINVAL; | |
42 | ||
43 | priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]); | |
44 | err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in_addr)); | |
45 | if (err < 0) | |
46 | return err; | |
47 | ||
48 | if (tb[NFTA_DUP_SREG_DEV] != NULL) { | |
49 | priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]); | |
50 | return nft_validate_register_load(priv->sreg_dev, sizeof(int)); | |
51 | } | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int nft_dup_ipv4_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
56 | { | |
57 | struct nft_dup_ipv4 *priv = nft_expr_priv(expr); | |
58 | ||
b73b8a1b LZ |
59 | if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr)) |
60 | goto nla_put_failure; | |
61 | if (priv->sreg_dev && | |
d877f071 PNA |
62 | nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev)) |
63 | goto nla_put_failure; | |
64 | ||
65 | return 0; | |
66 | ||
67 | nla_put_failure: | |
68 | return -1; | |
69 | } | |
70 | ||
71 | static struct nft_expr_type nft_dup_ipv4_type; | |
72 | static const struct nft_expr_ops nft_dup_ipv4_ops = { | |
73 | .type = &nft_dup_ipv4_type, | |
74 | .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv4)), | |
75 | .eval = nft_dup_ipv4_eval, | |
76 | .init = nft_dup_ipv4_init, | |
77 | .dump = nft_dup_ipv4_dump, | |
78 | }; | |
79 | ||
80 | static const struct nla_policy nft_dup_ipv4_policy[NFTA_DUP_MAX + 1] = { | |
81 | [NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 }, | |
82 | [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 }, | |
83 | }; | |
84 | ||
85 | static struct nft_expr_type nft_dup_ipv4_type __read_mostly = { | |
86 | .family = NFPROTO_IPV4, | |
87 | .name = "dup", | |
88 | .ops = &nft_dup_ipv4_ops, | |
89 | .policy = nft_dup_ipv4_policy, | |
90 | .maxattr = NFTA_DUP_MAX, | |
91 | .owner = THIS_MODULE, | |
92 | }; | |
93 | ||
94 | static int __init nft_dup_ipv4_module_init(void) | |
95 | { | |
96 | return nft_register_expr(&nft_dup_ipv4_type); | |
97 | } | |
98 | ||
99 | static void __exit nft_dup_ipv4_module_exit(void) | |
100 | { | |
101 | nft_unregister_expr(&nft_dup_ipv4_type); | |
102 | } | |
103 | ||
104 | module_init(nft_dup_ipv4_module_init); | |
105 | module_exit(nft_dup_ipv4_module_exit); | |
106 | ||
107 | MODULE_LICENSE("GPL"); | |
108 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
109 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "dup"); |