2 * Copyright (c) 2012-2016 Pablo Neira Ayuso <pablo@netfilter.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/nf_tables.h>
15 #include <net/netfilter/nf_tables.h>
17 #define nft_objref_priv(expr) *((struct nft_object **)nft_expr_priv(expr))
19 static void nft_objref_eval(const struct nft_expr *expr,
20 struct nft_regs *regs,
21 const struct nft_pktinfo *pkt)
23 struct nft_object *obj = nft_objref_priv(expr);
25 obj->ops->eval(obj, regs, pkt);
28 static int nft_objref_init(const struct nft_ctx *ctx,
29 const struct nft_expr *expr,
30 const struct nlattr * const tb[])
32 struct nft_object *obj = nft_objref_priv(expr);
33 u8 genmask = nft_genmask_next(ctx->net);
36 if (!tb[NFTA_OBJREF_IMM_NAME] ||
37 !tb[NFTA_OBJREF_IMM_TYPE])
40 objtype = ntohl(nla_get_be32(tb[NFTA_OBJREF_IMM_TYPE]));
41 obj = nft_obj_lookup(ctx->net, ctx->table,
42 tb[NFTA_OBJREF_IMM_NAME], objtype,
47 nft_objref_priv(expr) = obj;
53 static int nft_objref_dump(struct sk_buff *skb, const struct nft_expr *expr)
55 const struct nft_object *obj = nft_objref_priv(expr);
57 if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->key.name) ||
58 nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE,
59 htonl(obj->ops->type->type)))
68 static void nft_objref_deactivate(const struct nft_ctx *ctx,
69 const struct nft_expr *expr,
70 enum nft_trans_phase phase)
72 struct nft_object *obj = nft_objref_priv(expr);
74 if (phase == NFT_TRANS_COMMIT)
80 static void nft_objref_activate(const struct nft_ctx *ctx,
81 const struct nft_expr *expr)
83 struct nft_object *obj = nft_objref_priv(expr);
88 static struct nft_expr_type nft_objref_type;
89 static const struct nft_expr_ops nft_objref_ops = {
90 .type = &nft_objref_type,
91 .size = NFT_EXPR_SIZE(sizeof(struct nft_object *)),
92 .eval = nft_objref_eval,
93 .init = nft_objref_init,
94 .activate = nft_objref_activate,
95 .deactivate = nft_objref_deactivate,
96 .dump = nft_objref_dump,
99 struct nft_objref_map {
101 enum nft_registers sreg:8;
102 struct nft_set_binding binding;
105 static void nft_objref_map_eval(const struct nft_expr *expr,
106 struct nft_regs *regs,
107 const struct nft_pktinfo *pkt)
109 struct nft_objref_map *priv = nft_expr_priv(expr);
110 const struct nft_set *set = priv->set;
111 const struct nft_set_ext *ext;
112 struct nft_object *obj;
115 found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg],
118 regs->verdict.code = NFT_BREAK;
121 obj = *nft_set_ext_obj(ext);
122 obj->ops->eval(obj, regs, pkt);
125 static int nft_objref_map_init(const struct nft_ctx *ctx,
126 const struct nft_expr *expr,
127 const struct nlattr * const tb[])
129 struct nft_objref_map *priv = nft_expr_priv(expr);
130 u8 genmask = nft_genmask_next(ctx->net);
134 set = nft_set_lookup_global(ctx->net, ctx->table,
135 tb[NFTA_OBJREF_SET_NAME],
136 tb[NFTA_OBJREF_SET_ID], genmask);
140 if (!(set->flags & NFT_SET_OBJECT))
143 priv->sreg = nft_parse_register(tb[NFTA_OBJREF_SET_SREG]);
144 err = nft_validate_register_load(priv->sreg, set->klen);
148 priv->binding.flags = set->flags & NFT_SET_OBJECT;
150 err = nf_tables_bind_set(ctx, set, &priv->binding);
158 static int nft_objref_map_dump(struct sk_buff *skb, const struct nft_expr *expr)
160 const struct nft_objref_map *priv = nft_expr_priv(expr);
162 if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) ||
163 nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name))
164 goto nla_put_failure;
172 static void nft_objref_map_deactivate(const struct nft_ctx *ctx,
173 const struct nft_expr *expr,
174 enum nft_trans_phase phase)
176 struct nft_objref_map *priv = nft_expr_priv(expr);
178 nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
181 static void nft_objref_map_activate(const struct nft_ctx *ctx,
182 const struct nft_expr *expr)
184 struct nft_objref_map *priv = nft_expr_priv(expr);
189 static void nft_objref_map_destroy(const struct nft_ctx *ctx,
190 const struct nft_expr *expr)
192 struct nft_objref_map *priv = nft_expr_priv(expr);
194 nf_tables_destroy_set(ctx, priv->set);
197 static struct nft_expr_type nft_objref_type;
198 static const struct nft_expr_ops nft_objref_map_ops = {
199 .type = &nft_objref_type,
200 .size = NFT_EXPR_SIZE(sizeof(struct nft_objref_map)),
201 .eval = nft_objref_map_eval,
202 .init = nft_objref_map_init,
203 .activate = nft_objref_map_activate,
204 .deactivate = nft_objref_map_deactivate,
205 .destroy = nft_objref_map_destroy,
206 .dump = nft_objref_map_dump,
209 static const struct nft_expr_ops *
210 nft_objref_select_ops(const struct nft_ctx *ctx,
211 const struct nlattr * const tb[])
213 if (tb[NFTA_OBJREF_SET_SREG] &&
214 (tb[NFTA_OBJREF_SET_NAME] ||
215 tb[NFTA_OBJREF_SET_ID]))
216 return &nft_objref_map_ops;
217 else if (tb[NFTA_OBJREF_IMM_NAME] &&
218 tb[NFTA_OBJREF_IMM_TYPE])
219 return &nft_objref_ops;
221 return ERR_PTR(-EOPNOTSUPP);
224 static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = {
225 [NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING,
226 .len = NFT_OBJ_MAXNAMELEN - 1 },
227 [NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 },
228 [NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 },
229 [NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING,
230 .len = NFT_SET_MAXNAMELEN - 1 },
231 [NFTA_OBJREF_SET_ID] = { .type = NLA_U32 },
234 static struct nft_expr_type nft_objref_type __read_mostly = {
236 .select_ops = nft_objref_select_ops,
237 .policy = nft_objref_policy,
238 .maxattr = NFTA_OBJREF_MAX,
239 .owner = THIS_MODULE,
242 static int __init nft_objref_module_init(void)
244 return nft_register_expr(&nft_objref_type);
247 static void __exit nft_objref_module_exit(void)
249 nft_unregister_expr(&nft_objref_type);
252 module_init(nft_objref_module_init);
253 module_exit(nft_objref_module_exit);
255 MODULE_LICENSE("GPL");
256 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
257 MODULE_ALIAS_NFT_EXPR("objref");