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_regs *regs,
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, ®s->data[priv->sreg], &ext)) {
37 if (set->flags & NFT_SET_MAP)
38 nft_data_copy(®s->data[priv->dreg],
39 nft_set_ext_data(ext), set->dlen);
42 regs->verdict.code = NFT_BREAK;
45 static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = {
46 [NFTA_LOOKUP_SET] = { .type = NLA_STRING },
47 [NFTA_LOOKUP_SET_ID] = { .type = NLA_U32 },
48 [NFTA_LOOKUP_SREG] = { .type = NLA_U32 },
49 [NFTA_LOOKUP_DREG] = { .type = NLA_U32 },
52 static int nft_lookup_init(const struct nft_ctx *ctx,
53 const struct nft_expr *expr,
54 const struct nlattr * const tb[])
56 struct nft_lookup *priv = nft_expr_priv(expr);
60 if (tb[NFTA_LOOKUP_SET] == NULL ||
61 tb[NFTA_LOOKUP_SREG] == NULL)
64 set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET]);
66 if (tb[NFTA_LOOKUP_SET_ID]) {
67 set = nf_tables_set_lookup_byid(ctx->net,
68 tb[NFTA_LOOKUP_SET_ID]);
74 priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]);
75 err = nft_validate_register_load(priv->sreg, set->klen);
79 if (tb[NFTA_LOOKUP_DREG] != NULL) {
80 if (!(set->flags & NFT_SET_MAP))
83 priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]);
84 err = nft_validate_register_store(ctx, priv->dreg, NULL,
85 set->dtype, set->dlen);
88 } else if (set->flags & NFT_SET_MAP)
91 priv->binding.flags = set->flags & NFT_SET_MAP;
93 err = nf_tables_bind_set(ctx, set, &priv->binding);
101 static void nft_lookup_destroy(const struct nft_ctx *ctx,
102 const struct nft_expr *expr)
104 struct nft_lookup *priv = nft_expr_priv(expr);
106 nf_tables_unbind_set(ctx, priv->set, &priv->binding);
109 static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr)
111 const struct nft_lookup *priv = nft_expr_priv(expr);
113 if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name))
114 goto nla_put_failure;
115 if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg))
116 goto nla_put_failure;
117 if (priv->set->flags & NFT_SET_MAP)
118 if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg))
119 goto nla_put_failure;
126 static struct nft_expr_type nft_lookup_type;
127 static const struct nft_expr_ops nft_lookup_ops = {
128 .type = &nft_lookup_type,
129 .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)),
130 .eval = nft_lookup_eval,
131 .init = nft_lookup_init,
132 .destroy = nft_lookup_destroy,
133 .dump = nft_lookup_dump,
136 static struct nft_expr_type nft_lookup_type __read_mostly = {
138 .ops = &nft_lookup_ops,
139 .policy = nft_lookup_policy,
140 .maxattr = NFTA_LOOKUP_MAX,
141 .owner = THIS_MODULE,
144 int __init nft_lookup_module_init(void)
146 return nft_register_expr(&nft_lookup_type);
149 void nft_lookup_module_exit(void)
151 nft_unregister_expr(&nft_lookup_type);