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96518518 PM |
1 | /* |
2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/netlink.h> | |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/netfilter/nf_tables.h> | |
17 | #include <net/netfilter/nf_tables_core.h> | |
18 | #include <net/netfilter/nf_tables.h> | |
19 | ||
20 | struct nft_immediate_expr { | |
21 | struct nft_data data; | |
22 | enum nft_registers dreg:8; | |
23 | u8 dlen; | |
24 | }; | |
25 | ||
26 | static void nft_immediate_eval(const struct nft_expr *expr, | |
27 | struct nft_data data[NFT_REG_MAX + 1], | |
28 | const struct nft_pktinfo *pkt) | |
29 | { | |
30 | const struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
31 | ||
32 | nft_data_copy(&data[priv->dreg], &priv->data); | |
33 | } | |
34 | ||
35 | static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = { | |
36 | [NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 }, | |
37 | [NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED }, | |
38 | }; | |
39 | ||
40 | static int nft_immediate_init(const struct nft_ctx *ctx, | |
41 | const struct nft_expr *expr, | |
42 | const struct nlattr * const tb[]) | |
43 | { | |
44 | struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
45 | struct nft_data_desc desc; | |
46 | int err; | |
47 | ||
48 | if (tb[NFTA_IMMEDIATE_DREG] == NULL || | |
49 | tb[NFTA_IMMEDIATE_DATA] == NULL) | |
50 | return -EINVAL; | |
51 | ||
52 | priv->dreg = ntohl(nla_get_be32(tb[NFTA_IMMEDIATE_DREG])); | |
53 | err = nft_validate_output_register(priv->dreg); | |
54 | if (err < 0) | |
55 | return err; | |
56 | ||
57 | err = nft_data_init(ctx, &priv->data, &desc, tb[NFTA_IMMEDIATE_DATA]); | |
58 | if (err < 0) | |
59 | return err; | |
60 | priv->dlen = desc.len; | |
61 | ||
62 | err = nft_validate_data_load(ctx, priv->dreg, &priv->data, desc.type); | |
63 | if (err < 0) | |
64 | goto err1; | |
65 | ||
66 | return 0; | |
67 | ||
68 | err1: | |
69 | nft_data_uninit(&priv->data, desc.type); | |
70 | return err; | |
71 | } | |
72 | ||
73 | static void nft_immediate_destroy(const struct nft_expr *expr) | |
74 | { | |
75 | const struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
76 | return nft_data_uninit(&priv->data, nft_dreg_to_type(priv->dreg)); | |
77 | } | |
78 | ||
79 | static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
80 | { | |
81 | const struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
82 | ||
83 | if (nla_put_be32(skb, NFTA_IMMEDIATE_DREG, htonl(priv->dreg))) | |
84 | goto nla_put_failure; | |
85 | ||
86 | return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data, | |
87 | nft_dreg_to_type(priv->dreg), priv->dlen); | |
88 | ||
89 | nla_put_failure: | |
90 | return -1; | |
91 | } | |
92 | ||
20a69341 PM |
93 | static const struct nft_data *nft_immediate_get_verdict(const struct nft_expr *expr) |
94 | { | |
95 | const struct nft_immediate_expr *priv = nft_expr_priv(expr); | |
96 | ||
97 | if (priv->dreg == NFT_REG_VERDICT) | |
98 | return &priv->data; | |
99 | else | |
100 | return NULL; | |
101 | } | |
102 | ||
96518518 PM |
103 | static struct nft_expr_ops nft_imm_ops __read_mostly = { |
104 | .name = "immediate", | |
105 | .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)), | |
106 | .owner = THIS_MODULE, | |
107 | .eval = nft_immediate_eval, | |
108 | .init = nft_immediate_init, | |
109 | .destroy = nft_immediate_destroy, | |
110 | .dump = nft_immediate_dump, | |
20a69341 | 111 | .get_verdict = nft_immediate_get_verdict, |
96518518 PM |
112 | .policy = nft_immediate_policy, |
113 | .maxattr = NFTA_IMMEDIATE_MAX, | |
114 | }; | |
115 | ||
116 | int __init nft_immediate_module_init(void) | |
117 | { | |
118 | return nft_register_expr(&nft_imm_ops); | |
119 | } | |
120 | ||
121 | void nft_immediate_module_exit(void) | |
122 | { | |
123 | nft_unregister_expr(&nft_imm_ops); | |
124 | } |