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;
26 struct nft_set_binding binding;
29 static void nft_lookup_eval(const struct nft_expr *expr,
30 struct nft_regs *regs,
31 const struct nft_pktinfo *pkt)
33 const struct nft_lookup *priv = nft_expr_priv(expr);
34 const struct nft_set *set = priv->set;
35 const struct nft_set_ext *ext;
38 found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg],
41 regs->verdict.code = NFT_BREAK;
45 if (set->flags & NFT_SET_MAP)
46 nft_data_copy(®s->data[priv->dreg],
47 nft_set_ext_data(ext), set->dlen);
51 static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = {
52 [NFTA_LOOKUP_SET] = { .type = NLA_STRING,
53 .len = NFT_SET_MAXNAMELEN - 1 },
54 [NFTA_LOOKUP_SET_ID] = { .type = NLA_U32 },
55 [NFTA_LOOKUP_SREG] = { .type = NLA_U32 },
56 [NFTA_LOOKUP_DREG] = { .type = NLA_U32 },
57 [NFTA_LOOKUP_FLAGS] = { .type = NLA_U32 },
60 static int nft_lookup_init(const struct nft_ctx *ctx,
61 const struct nft_expr *expr,
62 const struct nlattr * const tb[])
64 struct nft_lookup *priv = nft_expr_priv(expr);
65 u8 genmask = nft_genmask_next(ctx->net);
70 if (tb[NFTA_LOOKUP_SET] == NULL ||
71 tb[NFTA_LOOKUP_SREG] == NULL)
74 set = nft_set_lookup_global(ctx->net, ctx->table, tb[NFTA_LOOKUP_SET],
75 tb[NFTA_LOOKUP_SET_ID], genmask);
79 if (set->flags & NFT_SET_EVAL)
82 priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]);
83 err = nft_validate_register_load(priv->sreg, set->klen);
87 if (tb[NFTA_LOOKUP_FLAGS]) {
88 flags = ntohl(nla_get_be32(tb[NFTA_LOOKUP_FLAGS]));
90 if (flags & ~NFT_LOOKUP_F_INV)
93 if (flags & NFT_LOOKUP_F_INV) {
94 if (set->flags & NFT_SET_MAP)
100 if (tb[NFTA_LOOKUP_DREG] != NULL) {
103 if (!(set->flags & NFT_SET_MAP))
106 priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]);
107 err = nft_validate_register_store(ctx, priv->dreg, NULL,
108 set->dtype, set->dlen);
111 } else if (set->flags & NFT_SET_MAP)
114 priv->binding.flags = set->flags & NFT_SET_MAP;
116 err = nf_tables_bind_set(ctx, set, &priv->binding);
124 static void nft_lookup_destroy(const struct nft_ctx *ctx,
125 const struct nft_expr *expr)
127 struct nft_lookup *priv = nft_expr_priv(expr);
129 nf_tables_unbind_set(ctx, priv->set, &priv->binding);
132 static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr)
134 const struct nft_lookup *priv = nft_expr_priv(expr);
135 u32 flags = priv->invert ? NFT_LOOKUP_F_INV : 0;
137 if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name))
138 goto nla_put_failure;
139 if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg))
140 goto nla_put_failure;
141 if (priv->set->flags & NFT_SET_MAP)
142 if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg))
143 goto nla_put_failure;
144 if (nla_put_be32(skb, NFTA_LOOKUP_FLAGS, htonl(flags)))
145 goto nla_put_failure;
152 static int nft_lookup_validate_setelem(const struct nft_ctx *ctx,
154 const struct nft_set_iter *iter,
155 struct nft_set_elem *elem)
157 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
158 const struct nft_data *data;
160 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
161 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
164 data = nft_set_ext_data(ext);
165 switch (data->verdict.code) {
168 return nft_chain_validate(ctx, data->verdict.chain);
174 static int nft_lookup_validate(const struct nft_ctx *ctx,
175 const struct nft_expr *expr,
176 const struct nft_data **d)
178 const struct nft_lookup *priv = nft_expr_priv(expr);
179 struct nft_set_iter iter;
181 if (!(priv->set->flags & NFT_SET_MAP) ||
182 priv->set->dtype != NFT_DATA_VERDICT)
185 iter.genmask = nft_genmask_next(ctx->net);
189 iter.fn = nft_lookup_validate_setelem;
191 priv->set->ops->walk(ctx, priv->set, &iter);
198 static const struct nft_expr_ops nft_lookup_ops = {
199 .type = &nft_lookup_type,
200 .size = NFT_EXPR_SIZE(sizeof(struct nft_lookup)),
201 .eval = nft_lookup_eval,
202 .init = nft_lookup_init,
203 .destroy = nft_lookup_destroy,
204 .dump = nft_lookup_dump,
205 .validate = nft_lookup_validate,
208 struct nft_expr_type nft_lookup_type __read_mostly = {
210 .ops = &nft_lookup_ops,
211 .policy = nft_lookup_policy,
212 .maxattr = NFTA_LOOKUP_MAX,
213 .owner = THIS_MODULE,