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20a69341 PM |
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 | ||
ef1f7df9 PM |
115 | static struct nft_expr_type nft_lookup_type; |
116 | static const struct nft_expr_ops nft_lookup_ops = { | |
117 | .type = &nft_lookup_type, | |
20a69341 | 118 | .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)), |
20a69341 PM |
119 | .eval = nft_lookup_eval, |
120 | .init = nft_lookup_init, | |
121 | .destroy = nft_lookup_destroy, | |
122 | .dump = nft_lookup_dump, | |
ef1f7df9 PM |
123 | }; |
124 | ||
125 | static struct nft_expr_type nft_lookup_type __read_mostly = { | |
126 | .name = "lookup", | |
127 | .ops = &nft_lookup_ops, | |
20a69341 PM |
128 | .policy = nft_lookup_policy, |
129 | .maxattr = NFTA_LOOKUP_MAX, | |
ef1f7df9 | 130 | .owner = THIS_MODULE, |
20a69341 PM |
131 | }; |
132 | ||
133 | int __init nft_lookup_module_init(void) | |
134 | { | |
ef1f7df9 | 135 | return nft_register_expr(&nft_lookup_type); |
20a69341 PM |
136 | } |
137 | ||
138 | void nft_lookup_module_exit(void) | |
139 | { | |
ef1f7df9 | 140 | nft_unregister_expr(&nft_lookup_type); |
20a69341 | 141 | } |