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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; | |
0071e184 | 25 | bool invert; |
20a69341 PM |
26 | struct nft_set_binding binding; |
27 | }; | |
28 | ||
29 | static void nft_lookup_eval(const struct nft_expr *expr, | |
a55e22e9 | 30 | struct nft_regs *regs, |
20a69341 PM |
31 | const struct nft_pktinfo *pkt) |
32 | { | |
33 | const struct nft_lookup *priv = nft_expr_priv(expr); | |
34 | const struct nft_set *set = priv->set; | |
b2832dd6 | 35 | const struct nft_set_ext *ext; |
0071e184 | 36 | bool found; |
20a69341 | 37 | |
0e5a1c7e PNA |
38 | found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg], |
39 | &ext) ^ priv->invert; | |
0071e184 AB |
40 | if (!found) { |
41 | regs->verdict.code = NFT_BREAK; | |
20a69341 | 42 | return; |
b2832dd6 | 43 | } |
0071e184 | 44 | |
4004d5c3 | 45 | if (set->flags & NFT_SET_MAP) |
0071e184 AB |
46 | nft_data_copy(®s->data[priv->dreg], |
47 | nft_set_ext_data(ext), set->dlen); | |
48 | ||
20a69341 PM |
49 | } |
50 | ||
51 | static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = { | |
b2fbd044 LZ |
52 | [NFTA_LOOKUP_SET] = { .type = NLA_STRING, |
53 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
4c1017aa | 54 | [NFTA_LOOKUP_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
55 | [NFTA_LOOKUP_SREG] = { .type = NLA_U32 }, |
56 | [NFTA_LOOKUP_DREG] = { .type = NLA_U32 }, | |
0071e184 | 57 | [NFTA_LOOKUP_FLAGS] = { .type = NLA_U32 }, |
20a69341 PM |
58 | }; |
59 | ||
60 | static int nft_lookup_init(const struct nft_ctx *ctx, | |
61 | const struct nft_expr *expr, | |
62 | const struct nlattr * const tb[]) | |
63 | { | |
64 | struct nft_lookup *priv = nft_expr_priv(expr); | |
37a9cc52 | 65 | u8 genmask = nft_genmask_next(ctx->net); |
20a69341 | 66 | struct nft_set *set; |
0071e184 | 67 | u32 flags; |
20a69341 PM |
68 | int err; |
69 | ||
70 | if (tb[NFTA_LOOKUP_SET] == NULL || | |
71 | tb[NFTA_LOOKUP_SREG] == NULL) | |
72 | return -EINVAL; | |
73 | ||
37a9cc52 | 74 | set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET], genmask); |
958bee14 PNA |
75 | if (IS_ERR(set)) { |
76 | if (tb[NFTA_LOOKUP_SET_ID]) { | |
77 | set = nf_tables_set_lookup_byid(ctx->net, | |
37a9cc52 PNA |
78 | tb[NFTA_LOOKUP_SET_ID], |
79 | genmask); | |
958bee14 PNA |
80 | } |
81 | if (IS_ERR(set)) | |
82 | return PTR_ERR(set); | |
83 | } | |
20a69341 | 84 | |
7c6c6e95 PM |
85 | if (set->flags & NFT_SET_EVAL) |
86 | return -EOPNOTSUPP; | |
87 | ||
b1c96ed3 | 88 | priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]); |
d07db988 | 89 | err = nft_validate_register_load(priv->sreg, set->klen); |
20a69341 PM |
90 | if (err < 0) |
91 | return err; | |
92 | ||
0071e184 AB |
93 | if (tb[NFTA_LOOKUP_FLAGS]) { |
94 | flags = ntohl(nla_get_be32(tb[NFTA_LOOKUP_FLAGS])); | |
95 | ||
96 | if (flags & ~NFT_LOOKUP_F_INV) | |
97 | return -EINVAL; | |
98 | ||
99 | if (flags & NFT_LOOKUP_F_INV) { | |
100 | if (set->flags & NFT_SET_MAP) | |
101 | return -EINVAL; | |
102 | priv->invert = true; | |
103 | } | |
104 | } | |
105 | ||
20a69341 | 106 | if (tb[NFTA_LOOKUP_DREG] != NULL) { |
0071e184 AB |
107 | if (priv->invert) |
108 | return -EINVAL; | |
20a69341 PM |
109 | if (!(set->flags & NFT_SET_MAP)) |
110 | return -EINVAL; | |
111 | ||
b1c96ed3 | 112 | priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]); |
58f40ab6 PM |
113 | err = nft_validate_register_store(ctx, priv->dreg, NULL, |
114 | set->dtype, set->dlen); | |
115 | if (err < 0) | |
116 | return err; | |
20a69341 PM |
117 | } else if (set->flags & NFT_SET_MAP) |
118 | return -EINVAL; | |
119 | ||
11113e19 PM |
120 | priv->binding.flags = set->flags & NFT_SET_MAP; |
121 | ||
20a69341 PM |
122 | err = nf_tables_bind_set(ctx, set, &priv->binding); |
123 | if (err < 0) | |
124 | return err; | |
125 | ||
126 | priv->set = set; | |
127 | return 0; | |
128 | } | |
129 | ||
62472bce PM |
130 | static void nft_lookup_destroy(const struct nft_ctx *ctx, |
131 | const struct nft_expr *expr) | |
20a69341 PM |
132 | { |
133 | struct nft_lookup *priv = nft_expr_priv(expr); | |
134 | ||
ab9da5c1 | 135 | nf_tables_unbind_set(ctx, priv->set, &priv->binding); |
20a69341 PM |
136 | } |
137 | ||
138 | static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
139 | { | |
140 | const struct nft_lookup *priv = nft_expr_priv(expr); | |
0071e184 | 141 | u32 flags = priv->invert ? NFT_LOOKUP_F_INV : 0; |
20a69341 PM |
142 | |
143 | if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name)) | |
144 | goto nla_put_failure; | |
b1c96ed3 | 145 | if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg)) |
20a69341 PM |
146 | goto nla_put_failure; |
147 | if (priv->set->flags & NFT_SET_MAP) | |
b1c96ed3 | 148 | if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg)) |
20a69341 | 149 | goto nla_put_failure; |
0071e184 AB |
150 | if (nla_put_be32(skb, NFTA_LOOKUP_FLAGS, htonl(flags))) |
151 | goto nla_put_failure; | |
20a69341 PM |
152 | return 0; |
153 | ||
154 | nla_put_failure: | |
155 | return -1; | |
156 | } | |
157 | ||
ef1f7df9 PM |
158 | static const struct nft_expr_ops nft_lookup_ops = { |
159 | .type = &nft_lookup_type, | |
20a69341 | 160 | .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)), |
20a69341 PM |
161 | .eval = nft_lookup_eval, |
162 | .init = nft_lookup_init, | |
163 | .destroy = nft_lookup_destroy, | |
164 | .dump = nft_lookup_dump, | |
ef1f7df9 PM |
165 | }; |
166 | ||
4e24877e | 167 | struct nft_expr_type nft_lookup_type __read_mostly = { |
ef1f7df9 PM |
168 | .name = "lookup", |
169 | .ops = &nft_lookup_ops, | |
20a69341 PM |
170 | .policy = nft_lookup_policy, |
171 | .maxattr = NFTA_LOOKUP_MAX, | |
ef1f7df9 | 172 | .owner = THIS_MODULE, |
20a69341 | 173 | }; |