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1 | /* |
2 | * Copyright (c) 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/list.h> |
14 | #include <linux/rbtree.h> |
15 | #include <linux/netlink.h> |
16 | #include <linux/netfilter.h> |
17 | #include <linux/netfilter/nf_tables.h> |
18 | #include <net/netfilter/nf_tables.h> |
19 | |
20 | struct nft_lookup { |
21 | struct nft_set *set; |
22 | enum nft_registers sreg:8; |
23 | enum nft_registers dreg:8; |
24 | struct nft_set_binding binding; |
25 | }; |
26 | |
27 | static void nft_lookup_eval(const struct nft_expr *expr, |
28 | struct nft_data data[NFT_REG_MAX + 1], |
29 | const struct nft_pktinfo *pkt) |
30 | { |
31 | const struct nft_lookup *priv = nft_expr_priv(expr); |
32 | const struct nft_set *set = priv->set; |
33 | |
34 | if (set->ops->lookup(set, &data[priv->sreg], &data[priv->dreg])) |
35 | return; |
36 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; |
37 | } |
38 | |
39 | static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = { |
40 | [NFTA_LOOKUP_SET] = { .type = NLA_STRING }, |
41 | [NFTA_LOOKUP_SREG] = { .type = NLA_U32 }, |
42 | [NFTA_LOOKUP_DREG] = { .type = NLA_U32 }, |
43 | }; |
44 | |
45 | static int nft_lookup_init(const struct nft_ctx *ctx, |
46 | const struct nft_expr *expr, |
47 | const struct nlattr * const tb[]) |
48 | { |
49 | struct nft_lookup *priv = nft_expr_priv(expr); |
50 | struct nft_set *set; |
51 | int err; |
52 | |
53 | if (tb[NFTA_LOOKUP_SET] == NULL || |
54 | tb[NFTA_LOOKUP_SREG] == NULL) |
55 | return -EINVAL; |
56 | |
57 | set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET]); |
58 | if (IS_ERR(set)) |
59 | return PTR_ERR(set); |
60 | |
61 | priv->sreg = ntohl(nla_get_be32(tb[NFTA_LOOKUP_SREG])); |
62 | err = nft_validate_input_register(priv->sreg); |
63 | if (err < 0) |
64 | return err; |
65 | |
66 | if (tb[NFTA_LOOKUP_DREG] != NULL) { |
67 | if (!(set->flags & NFT_SET_MAP)) |
68 | return -EINVAL; |
69 | |
70 | priv->dreg = ntohl(nla_get_be32(tb[NFTA_LOOKUP_DREG])); |
71 | err = nft_validate_output_register(priv->dreg); |
72 | if (err < 0) |
73 | return err; |
74 | |
75 | if (priv->dreg == NFT_REG_VERDICT) { |
76 | if (set->dtype != NFT_DATA_VERDICT) |
77 | return -EINVAL; |
78 | } else if (set->dtype == NFT_DATA_VERDICT) |
79 | return -EINVAL; |
80 | } else if (set->flags & NFT_SET_MAP) |
81 | return -EINVAL; |
82 | |
83 | err = nf_tables_bind_set(ctx, set, &priv->binding); |
84 | if (err < 0) |
85 | return err; |
86 | |
87 | priv->set = set; |
88 | return 0; |
89 | } |
90 | |
91 | static void nft_lookup_destroy(const struct nft_expr *expr) |
92 | { |
93 | struct nft_lookup *priv = nft_expr_priv(expr); |
94 | |
95 | nf_tables_unbind_set(NULL, priv->set, &priv->binding); |
96 | } |
97 | |
98 | static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr) |
99 | { |
100 | const struct nft_lookup *priv = nft_expr_priv(expr); |
101 | |
102 | if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name)) |
103 | goto nla_put_failure; |
104 | if (nla_put_be32(skb, NFTA_LOOKUP_SREG, htonl(priv->sreg))) |
105 | goto nla_put_failure; |
106 | if (priv->set->flags & NFT_SET_MAP) |
107 | if (nla_put_be32(skb, NFTA_LOOKUP_DREG, htonl(priv->dreg))) |
108 | goto nla_put_failure; |
109 | return 0; |
110 | |
111 | nla_put_failure: |
112 | return -1; |
113 | } |
114 | |
115 | static struct nft_expr_type nft_lookup_type; |
116 | static const struct nft_expr_ops nft_lookup_ops = { |
117 | .type = &nft_lookup_type, |
118 | .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)), |
119 | .eval = nft_lookup_eval, |
120 | .init = nft_lookup_init, |
121 | .destroy = nft_lookup_destroy, |
122 | .dump = nft_lookup_dump, |
123 | }; |
124 | |
125 | static struct nft_expr_type nft_lookup_type __read_mostly = { |
126 | .name = "lookup", |
127 | .ops = &nft_lookup_ops, |
128 | .policy = nft_lookup_policy, |
129 | .maxattr = NFTA_LOOKUP_MAX, |
130 | .owner = THIS_MODULE, |
131 | }; |
132 | |
133 | int __init nft_lookup_module_init(void) |
134 | { |
135 | return nft_register_expr(&nft_lookup_type); |
136 | } |
137 | |
138 | void nft_lookup_module_exit(void) |
139 | { |
140 | nft_unregister_expr(&nft_lookup_type); |
141 | } |
142 |
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od-2011-09-04
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