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1 | /* |
2 | * Copyright (c) 2008-2009 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 | |
93 | static int nft_immediate_validate(const struct nft_ctx *ctx, |
94 | const struct nft_expr *expr, |
95 | const struct nft_data **data) |
96 | { |
97 | const struct nft_immediate_expr *priv = nft_expr_priv(expr); |
98 | |
99 | if (priv->dreg == NFT_REG_VERDICT) |
100 | *data = &priv->data; |
101 | |
102 | return 0; |
103 | } |
104 | |
105 | static struct nft_expr_type nft_imm_type; |
106 | static const struct nft_expr_ops nft_imm_ops = { |
107 | .type = &nft_imm_type, |
108 | .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)), |
109 | .eval = nft_immediate_eval, |
110 | .init = nft_immediate_init, |
111 | .destroy = nft_immediate_destroy, |
112 | .dump = nft_immediate_dump, |
113 | .validate = nft_immediate_validate, |
114 | }; |
115 | |
116 | static struct nft_expr_type nft_imm_type __read_mostly = { |
117 | .name = "immediate", |
118 | .ops = &nft_imm_ops, |
119 | .policy = nft_immediate_policy, |
120 | .maxattr = NFTA_IMMEDIATE_MAX, |
121 | .owner = THIS_MODULE, |
122 | }; |
123 | |
124 | int __init nft_immediate_module_init(void) |
125 | { |
126 | return nft_register_expr(&nft_imm_type); |
127 | } |
128 | |
129 | void nft_immediate_module_exit(void) |
130 | { |
131 | nft_unregister_expr(&nft_imm_type); |
132 | } |
133 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9