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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> | |
bd76ed36 | 19 | #include <net/netfilter/nf_tables_core.h> |
20a69341 PM |
20 | |
21 | struct nft_lookup { | |
22 | struct nft_set *set; | |
23 | enum nft_registers sreg:8; | |
24 | enum nft_registers dreg:8; | |
25 | struct nft_set_binding binding; | |
26 | }; | |
27 | ||
28 | static void nft_lookup_eval(const struct nft_expr *expr, | |
a55e22e9 | 29 | struct nft_regs *regs, |
20a69341 PM |
30 | const struct nft_pktinfo *pkt) |
31 | { | |
32 | const struct nft_lookup *priv = nft_expr_priv(expr); | |
33 | const struct nft_set *set = priv->set; | |
b2832dd6 | 34 | const struct nft_set_ext *ext; |
20a69341 | 35 | |
a55e22e9 | 36 | if (set->ops->lookup(set, ®s->data[priv->sreg], &ext)) { |
b2832dd6 | 37 | if (set->flags & NFT_SET_MAP) |
a55e22e9 | 38 | nft_data_copy(®s->data[priv->dreg], |
49499c3e | 39 | nft_set_ext_data(ext), set->dlen); |
20a69341 | 40 | return; |
b2832dd6 | 41 | } |
a55e22e9 | 42 | regs->verdict.code = NFT_BREAK; |
20a69341 PM |
43 | } |
44 | ||
45 | static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = { | |
46 | [NFTA_LOOKUP_SET] = { .type = NLA_STRING }, | |
4c1017aa | 47 | [NFTA_LOOKUP_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
48 | [NFTA_LOOKUP_SREG] = { .type = NLA_U32 }, |
49 | [NFTA_LOOKUP_DREG] = { .type = NLA_U32 }, | |
50 | }; | |
51 | ||
52 | static int nft_lookup_init(const struct nft_ctx *ctx, | |
53 | const struct nft_expr *expr, | |
54 | const struct nlattr * const tb[]) | |
55 | { | |
56 | struct nft_lookup *priv = nft_expr_priv(expr); | |
57 | struct nft_set *set; | |
58 | int err; | |
59 | ||
60 | if (tb[NFTA_LOOKUP_SET] == NULL || | |
61 | tb[NFTA_LOOKUP_SREG] == NULL) | |
62 | return -EINVAL; | |
63 | ||
64 | set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET]); | |
958bee14 PNA |
65 | if (IS_ERR(set)) { |
66 | if (tb[NFTA_LOOKUP_SET_ID]) { | |
67 | set = nf_tables_set_lookup_byid(ctx->net, | |
68 | tb[NFTA_LOOKUP_SET_ID]); | |
69 | } | |
70 | if (IS_ERR(set)) | |
71 | return PTR_ERR(set); | |
72 | } | |
20a69341 | 73 | |
7c6c6e95 PM |
74 | if (set->flags & NFT_SET_EVAL) |
75 | return -EOPNOTSUPP; | |
76 | ||
b1c96ed3 | 77 | priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]); |
d07db988 | 78 | err = nft_validate_register_load(priv->sreg, set->klen); |
20a69341 PM |
79 | if (err < 0) |
80 | return err; | |
81 | ||
82 | if (tb[NFTA_LOOKUP_DREG] != NULL) { | |
83 | if (!(set->flags & NFT_SET_MAP)) | |
84 | return -EINVAL; | |
85 | ||
b1c96ed3 | 86 | priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]); |
58f40ab6 PM |
87 | err = nft_validate_register_store(ctx, priv->dreg, NULL, |
88 | set->dtype, set->dlen); | |
89 | if (err < 0) | |
90 | return err; | |
20a69341 PM |
91 | } else if (set->flags & NFT_SET_MAP) |
92 | return -EINVAL; | |
93 | ||
11113e19 PM |
94 | priv->binding.flags = set->flags & NFT_SET_MAP; |
95 | ||
20a69341 PM |
96 | err = nf_tables_bind_set(ctx, set, &priv->binding); |
97 | if (err < 0) | |
98 | return err; | |
99 | ||
100 | priv->set = set; | |
101 | return 0; | |
102 | } | |
103 | ||
62472bce PM |
104 | static void nft_lookup_destroy(const struct nft_ctx *ctx, |
105 | const struct nft_expr *expr) | |
20a69341 PM |
106 | { |
107 | struct nft_lookup *priv = nft_expr_priv(expr); | |
108 | ||
ab9da5c1 | 109 | nf_tables_unbind_set(ctx, priv->set, &priv->binding); |
20a69341 PM |
110 | } |
111 | ||
112 | static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
113 | { | |
114 | const struct nft_lookup *priv = nft_expr_priv(expr); | |
115 | ||
116 | if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name)) | |
117 | goto nla_put_failure; | |
b1c96ed3 | 118 | if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg)) |
20a69341 PM |
119 | goto nla_put_failure; |
120 | if (priv->set->flags & NFT_SET_MAP) | |
b1c96ed3 | 121 | if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg)) |
20a69341 PM |
122 | goto nla_put_failure; |
123 | return 0; | |
124 | ||
125 | nla_put_failure: | |
126 | return -1; | |
127 | } | |
128 | ||
ef1f7df9 PM |
129 | static struct nft_expr_type nft_lookup_type; |
130 | static const struct nft_expr_ops nft_lookup_ops = { | |
131 | .type = &nft_lookup_type, | |
20a69341 | 132 | .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)), |
20a69341 PM |
133 | .eval = nft_lookup_eval, |
134 | .init = nft_lookup_init, | |
135 | .destroy = nft_lookup_destroy, | |
136 | .dump = nft_lookup_dump, | |
ef1f7df9 PM |
137 | }; |
138 | ||
139 | static struct nft_expr_type nft_lookup_type __read_mostly = { | |
140 | .name = "lookup", | |
141 | .ops = &nft_lookup_ops, | |
20a69341 PM |
142 | .policy = nft_lookup_policy, |
143 | .maxattr = NFTA_LOOKUP_MAX, | |
ef1f7df9 | 144 | .owner = THIS_MODULE, |
20a69341 PM |
145 | }; |
146 | ||
147 | int __init nft_lookup_module_init(void) | |
148 | { | |
ef1f7df9 | 149 | return nft_register_expr(&nft_lookup_type); |
20a69341 PM |
150 | } |
151 | ||
152 | void nft_lookup_module_exit(void) | |
153 | { | |
ef1f7df9 | 154 | nft_unregister_expr(&nft_lookup_type); |
20a69341 | 155 | } |