2 * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
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.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
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 #include <net/netfilter/nf_tables_core.h>
23 enum nft_registers sreg:8;
24 enum nft_registers dreg:8;
25 struct nft_set_binding binding;
28 static void nft_lookup_eval(const struct nft_expr *expr,
29 struct nft_data data[NFT_REG_MAX + 1],
30 const struct nft_pktinfo *pkt)
32 const struct nft_lookup *priv = nft_expr_priv(expr);
33 const struct nft_set *set = priv->set;
34 const struct nft_set_ext *ext;
36 if (set->ops->lookup(set, &data[priv->sreg], &ext)) {
37 if (set->flags & NFT_SET_MAP)
38 nft_data_copy(&data[priv->dreg], nft_set_ext_data(ext));
41 data[NFT_REG_VERDICT].verdict = NFT_BREAK;
44 static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = {
45 [NFTA_LOOKUP_SET] = { .type = NLA_STRING },
46 [NFTA_LOOKUP_SET_ID] = { .type = NLA_U32 },
47 [NFTA_LOOKUP_SREG] = { .type = NLA_U32 },
48 [NFTA_LOOKUP_DREG] = { .type = NLA_U32 },
51 static int nft_lookup_init(const struct nft_ctx *ctx,
52 const struct nft_expr *expr,
53 const struct nlattr * const tb[])
55 struct nft_lookup *priv = nft_expr_priv(expr);
59 if (tb[NFTA_LOOKUP_SET] == NULL ||
60 tb[NFTA_LOOKUP_SREG] == NULL)
63 set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET]);
65 if (tb[NFTA_LOOKUP_SET_ID]) {
66 set = nf_tables_set_lookup_byid(ctx->net,
67 tb[NFTA_LOOKUP_SET_ID]);
73 priv->sreg = ntohl(nla_get_be32(tb[NFTA_LOOKUP_SREG]));
74 err = nft_validate_input_register(priv->sreg);
78 if (tb[NFTA_LOOKUP_DREG] != NULL) {
79 if (!(set->flags & NFT_SET_MAP))
82 priv->dreg = ntohl(nla_get_be32(tb[NFTA_LOOKUP_DREG]));
83 err = nft_validate_register_store(ctx, priv->dreg, NULL,
84 set->dtype, set->dlen);
87 } else if (set->flags & NFT_SET_MAP)
90 priv->binding.flags = set->flags & NFT_SET_MAP;
92 err = nf_tables_bind_set(ctx, set, &priv->binding);
100 static void nft_lookup_destroy(const struct nft_ctx *ctx,
101 const struct nft_expr *expr)
103 struct nft_lookup *priv = nft_expr_priv(expr);
105 nf_tables_unbind_set(ctx, priv->set, &priv->binding);
108 static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr)
110 const struct nft_lookup *priv = nft_expr_priv(expr);
112 if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name))
113 goto nla_put_failure;
114 if (nla_put_be32(skb, NFTA_LOOKUP_SREG, htonl(priv->sreg)))
115 goto nla_put_failure;
116 if (priv->set->flags & NFT_SET_MAP)
117 if (nla_put_be32(skb, NFTA_LOOKUP_DREG, htonl(priv->dreg)))
118 goto nla_put_failure;
125 static struct nft_expr_type nft_lookup_type;
126 static const struct nft_expr_ops nft_lookup_ops = {
127 .type = &nft_lookup_type,
128 .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)),
129 .eval = nft_lookup_eval,
130 .init = nft_lookup_init,
131 .destroy = nft_lookup_destroy,
132 .dump = nft_lookup_dump,
135 static struct nft_expr_type nft_lookup_type __read_mostly = {
137 .ops = &nft_lookup_ops,
138 .policy = nft_lookup_policy,
139 .maxattr = NFTA_LOOKUP_MAX,
140 .owner = THIS_MODULE,
143 int __init nft_lookup_module_init(void)
145 return nft_register_expr(&nft_lookup_type);
148 void nft_lookup_module_exit(void)
150 nft_unregister_expr(&nft_lookup_type);