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->table, tb[NFTA_OBJREF_IMM_NAME], objtype,
46 nft_objref_priv(expr) = obj;
52 static int nft_objref_dump(struct sk_buff *skb, const struct nft_expr *expr)
54 const struct nft_object *obj = nft_objref_priv(expr);
56 if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->name) ||
57 nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE,
58 htonl(obj->ops->type->type)))
67 static void nft_objref_destroy(const struct nft_ctx *ctx,
68 const struct nft_expr *expr)
70 struct nft_object *obj = nft_objref_priv(expr);
75 static struct nft_expr_type nft_objref_type;
76 static const struct nft_expr_ops nft_objref_ops = {
77 .type = &nft_objref_type,
78 .size = NFT_EXPR_SIZE(sizeof(struct nft_object *)),
79 .eval = nft_objref_eval,
80 .init = nft_objref_init,
81 .destroy = nft_objref_destroy,
82 .dump = nft_objref_dump,
85 struct nft_objref_map {
87 enum nft_registers sreg:8;
88 struct nft_set_binding binding;
91 static void nft_objref_map_eval(const struct nft_expr *expr,
92 struct nft_regs *regs,
93 const struct nft_pktinfo *pkt)
95 struct nft_objref_map *priv = nft_expr_priv(expr);
96 const struct nft_set *set = priv->set;
97 const struct nft_set_ext *ext;
98 struct nft_object *obj;
101 found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg],
104 regs->verdict.code = NFT_BREAK;
107 obj = *nft_set_ext_obj(ext);
108 obj->ops->eval(obj, regs, pkt);
111 static int nft_objref_map_init(const struct nft_ctx *ctx,
112 const struct nft_expr *expr,
113 const struct nlattr * const tb[])
115 struct nft_objref_map *priv = nft_expr_priv(expr);
116 u8 genmask = nft_genmask_next(ctx->net);
120 set = nft_set_lookup_global(ctx->net, ctx->table,
121 tb[NFTA_OBJREF_SET_NAME],
122 tb[NFTA_OBJREF_SET_ID], genmask);
126 if (!(set->flags & NFT_SET_OBJECT))
129 priv->sreg = nft_parse_register(tb[NFTA_OBJREF_SET_SREG]);
130 err = nft_validate_register_load(priv->sreg, set->klen);
134 priv->binding.flags = set->flags & NFT_SET_OBJECT;
136 err = nf_tables_bind_set(ctx, set, &priv->binding);
144 static int nft_objref_map_dump(struct sk_buff *skb, const struct nft_expr *expr)
146 const struct nft_objref_map *priv = nft_expr_priv(expr);
148 if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) ||
149 nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name))
150 goto nla_put_failure;
158 static void nft_objref_map_destroy(const struct nft_ctx *ctx,
159 const struct nft_expr *expr)
161 struct nft_objref_map *priv = nft_expr_priv(expr);
163 nf_tables_unbind_set(ctx, priv->set, &priv->binding);
166 static struct nft_expr_type nft_objref_type;
167 static const struct nft_expr_ops nft_objref_map_ops = {
168 .type = &nft_objref_type,
169 .size = NFT_EXPR_SIZE(sizeof(struct nft_objref_map)),
170 .eval = nft_objref_map_eval,
171 .init = nft_objref_map_init,
172 .destroy = nft_objref_map_destroy,
173 .dump = nft_objref_map_dump,
176 static const struct nft_expr_ops *
177 nft_objref_select_ops(const struct nft_ctx *ctx,
178 const struct nlattr * const tb[])
180 if (tb[NFTA_OBJREF_SET_SREG] &&
181 (tb[NFTA_OBJREF_SET_NAME] ||
182 tb[NFTA_OBJREF_SET_ID]))
183 return &nft_objref_map_ops;
184 else if (tb[NFTA_OBJREF_IMM_NAME] &&
185 tb[NFTA_OBJREF_IMM_TYPE])
186 return &nft_objref_ops;
188 return ERR_PTR(-EOPNOTSUPP);
191 static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = {
192 [NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING,
193 .len = NFT_OBJ_MAXNAMELEN - 1 },
194 [NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 },
195 [NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 },
196 [NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING,
197 .len = NFT_SET_MAXNAMELEN - 1 },
198 [NFTA_OBJREF_SET_ID] = { .type = NLA_U32 },
201 static struct nft_expr_type nft_objref_type __read_mostly = {
203 .select_ops = nft_objref_select_ops,
204 .policy = nft_objref_policy,
205 .maxattr = NFTA_OBJREF_MAX,
206 .owner = THIS_MODULE,
209 static int __init nft_objref_module_init(void)
211 return nft_register_expr(&nft_objref_type);
214 static void __exit nft_objref_module_exit(void)
216 nft_unregister_expr(&nft_objref_type);
219 module_init(nft_objref_module_init);
220 module_exit(nft_objref_module_exit);
222 MODULE_LICENSE("GPL");
223 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
224 MODULE_ALIAS_NFT_EXPR("objref");