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1/*
2 * Copyright (c) 2012-2016 Pablo Neira Ayuso <pablo@netfilter.org>
3 *
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.
7 */
8
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>
16
17#define nft_objref_priv(expr) *((struct nft_object **)nft_expr_priv(expr))
18
19static void nft_objref_eval(const struct nft_expr *expr,
20 struct nft_regs *regs,
21 const struct nft_pktinfo *pkt)
22{
23 struct nft_object *obj = nft_objref_priv(expr);
24
25 obj->type->eval(obj, regs, pkt);
26}
27
28static int nft_objref_init(const struct nft_ctx *ctx,
29 const struct nft_expr *expr,
30 const struct nlattr * const tb[])
31{
32 struct nft_object *obj = nft_objref_priv(expr);
33 u8 genmask = nft_genmask_next(ctx->net);
34 u32 objtype;
35
36 if (!tb[NFTA_OBJREF_IMM_NAME] ||
37 !tb[NFTA_OBJREF_IMM_TYPE])
38 return -EINVAL;
39
40 objtype = ntohl(nla_get_be32(tb[NFTA_OBJREF_IMM_TYPE]));
41 obj = nf_tables_obj_lookup(ctx->table, tb[NFTA_OBJREF_IMM_NAME], objtype,
42 genmask);
43 if (IS_ERR(obj))
44 return -ENOENT;
45
46 nft_objref_priv(expr) = obj;
47 obj->use++;
48
49 return 0;
50}
51
52static int nft_objref_dump(struct sk_buff *skb, const struct nft_expr *expr)
53{
54 const struct nft_object *obj = nft_objref_priv(expr);
55
56 if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->name) ||
57 nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE, htonl(obj->type->type)))
58 goto nla_put_failure;
59
60 return 0;
61
62nla_put_failure:
63 return -1;
64}
65
66static void nft_objref_destroy(const struct nft_ctx *ctx,
67 const struct nft_expr *expr)
68{
69 struct nft_object *obj = nft_objref_priv(expr);
70
71 obj->use--;
72}
73
74static struct nft_expr_type nft_objref_type;
75static const struct nft_expr_ops nft_objref_ops = {
76 .type = &nft_objref_type,
77 .size = NFT_EXPR_SIZE(sizeof(struct nft_object *)),
78 .eval = nft_objref_eval,
79 .init = nft_objref_init,
80 .destroy = nft_objref_destroy,
81 .dump = nft_objref_dump,
82};
83
84struct nft_objref_map {
85 struct nft_set *set;
86 enum nft_registers sreg:8;
87 struct nft_set_binding binding;
88};
89
90static void nft_objref_map_eval(const struct nft_expr *expr,
91 struct nft_regs *regs,
92 const struct nft_pktinfo *pkt)
93{
94 struct nft_objref_map *priv = nft_expr_priv(expr);
95 const struct nft_set *set = priv->set;
96 const struct nft_set_ext *ext;
97 struct nft_object *obj;
98 bool found;
99
100 found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg],
101 &ext);
102 if (!found) {
103 regs->verdict.code = NFT_BREAK;
104 return;
105 }
106 obj = *nft_set_ext_obj(ext);
107 obj->type->eval(obj, regs, pkt);
108}
109
110static int nft_objref_map_init(const struct nft_ctx *ctx,
111 const struct nft_expr *expr,
112 const struct nlattr * const tb[])
113{
114 struct nft_objref_map *priv = nft_expr_priv(expr);
115 u8 genmask = nft_genmask_next(ctx->net);
116 struct nft_set *set;
117 int err;
118
119 set = nf_tables_set_lookup(ctx->table, tb[NFTA_OBJREF_SET_NAME], genmask);
120 if (IS_ERR(set)) {
121 if (tb[NFTA_OBJREF_SET_ID]) {
122 set = nf_tables_set_lookup_byid(ctx->net,
123 tb[NFTA_OBJREF_SET_ID],
124 genmask);
125 }
126 if (IS_ERR(set))
127 return PTR_ERR(set);
128 }
129
130 if (!(set->flags & NFT_SET_OBJECT))
131 return -EINVAL;
132
133 priv->sreg = nft_parse_register(tb[NFTA_OBJREF_SET_SREG]);
134 err = nft_validate_register_load(priv->sreg, set->klen);
135 if (err < 0)
136 return err;
137
138 priv->binding.flags = set->flags & NFT_SET_OBJECT;
139
140 err = nf_tables_bind_set(ctx, set, &priv->binding);
141 if (err < 0)
142 return err;
143
144 priv->set = set;
145 return 0;
146}
147
148static int nft_objref_map_dump(struct sk_buff *skb, const struct nft_expr *expr)
149{
150 const struct nft_objref_map *priv = nft_expr_priv(expr);
151
152 if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) ||
153 nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name))
154 goto nla_put_failure;
155
156 return 0;
157
158nla_put_failure:
159 return -1;
160}
161
162static void nft_objref_map_destroy(const struct nft_ctx *ctx,
163 const struct nft_expr *expr)
164{
165 struct nft_objref_map *priv = nft_expr_priv(expr);
166
167 nf_tables_unbind_set(ctx, priv->set, &priv->binding);
168}
169
170static struct nft_expr_type nft_objref_type;
171static const struct nft_expr_ops nft_objref_map_ops = {
172 .type = &nft_objref_type,
173 .size = NFT_EXPR_SIZE(sizeof(struct nft_objref_map)),
174 .eval = nft_objref_map_eval,
175 .init = nft_objref_map_init,
176 .destroy = nft_objref_map_destroy,
177 .dump = nft_objref_map_dump,
178};
179
180static const struct nft_expr_ops *
181nft_objref_select_ops(const struct nft_ctx *ctx,
182 const struct nlattr * const tb[])
183{
184 if (tb[NFTA_OBJREF_SET_SREG] &&
185 (tb[NFTA_OBJREF_SET_NAME] ||
186 tb[NFTA_OBJREF_SET_ID]))
187 return &nft_objref_map_ops;
188 else if (tb[NFTA_OBJREF_IMM_NAME] &&
189 tb[NFTA_OBJREF_IMM_TYPE])
190 return &nft_objref_ops;
191
192 return ERR_PTR(-EOPNOTSUPP);
193}
194
195static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = {
196 [NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING,
197 .len = NFT_OBJ_MAXNAMELEN - 1 },
198 [NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 },
199 [NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 },
200 [NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING,
201 .len = NFT_SET_MAXNAMELEN - 1 },
202 [NFTA_OBJREF_SET_ID] = { .type = NLA_U32 },
203};
204
205static struct nft_expr_type nft_objref_type __read_mostly = {
206 .name = "objref",
207 .select_ops = nft_objref_select_ops,
208 .policy = nft_objref_policy,
209 .maxattr = NFTA_OBJREF_MAX,
210 .owner = THIS_MODULE,
211};
212
213static int __init nft_objref_module_init(void)
214{
215 return nft_register_expr(&nft_objref_type);
216}
217
218static void __exit nft_objref_module_exit(void)
219{
220 nft_unregister_expr(&nft_objref_type);
221}
222
223module_init(nft_objref_module_init);
224module_exit(nft_objref_module_exit);
225
226MODULE_LICENSE("GPL");
227MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
228MODULE_ALIAS_NFT_EXPR("objref");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2012-2016 Pablo Neira Ayuso <pablo@netfilter.org>
4 */
5
6#include <linux/init.h>
7#include <linux/module.h>
8#include <linux/skbuff.h>
9#include <linux/netlink.h>
10#include <linux/netfilter.h>
11#include <linux/netfilter/nf_tables.h>
12#include <net/netfilter/nf_tables.h>
13
14#define nft_objref_priv(expr) *((struct nft_object **)nft_expr_priv(expr))
15
16static void nft_objref_eval(const struct nft_expr *expr,
17 struct nft_regs *regs,
18 const struct nft_pktinfo *pkt)
19{
20 struct nft_object *obj = nft_objref_priv(expr);
21
22 obj->ops->eval(obj, regs, pkt);
23}
24
25static int nft_objref_init(const struct nft_ctx *ctx,
26 const struct nft_expr *expr,
27 const struct nlattr * const tb[])
28{
29 struct nft_object *obj = nft_objref_priv(expr);
30 u8 genmask = nft_genmask_next(ctx->net);
31 u32 objtype;
32
33 if (!tb[NFTA_OBJREF_IMM_NAME] ||
34 !tb[NFTA_OBJREF_IMM_TYPE])
35 return -EINVAL;
36
37 objtype = ntohl(nla_get_be32(tb[NFTA_OBJREF_IMM_TYPE]));
38 obj = nft_obj_lookup(ctx->net, ctx->table,
39 tb[NFTA_OBJREF_IMM_NAME], objtype,
40 genmask);
41 if (IS_ERR(obj))
42 return -ENOENT;
43
44 nft_objref_priv(expr) = obj;
45 obj->use++;
46
47 return 0;
48}
49
50static int nft_objref_dump(struct sk_buff *skb, const struct nft_expr *expr)
51{
52 const struct nft_object *obj = nft_objref_priv(expr);
53
54 if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->key.name) ||
55 nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE,
56 htonl(obj->ops->type->type)))
57 goto nla_put_failure;
58
59 return 0;
60
61nla_put_failure:
62 return -1;
63}
64
65static void nft_objref_deactivate(const struct nft_ctx *ctx,
66 const struct nft_expr *expr,
67 enum nft_trans_phase phase)
68{
69 struct nft_object *obj = nft_objref_priv(expr);
70
71 if (phase == NFT_TRANS_COMMIT)
72 return;
73
74 obj->use--;
75}
76
77static void nft_objref_activate(const struct nft_ctx *ctx,
78 const struct nft_expr *expr)
79{
80 struct nft_object *obj = nft_objref_priv(expr);
81
82 obj->use++;
83}
84
85static struct nft_expr_type nft_objref_type;
86static const struct nft_expr_ops nft_objref_ops = {
87 .type = &nft_objref_type,
88 .size = NFT_EXPR_SIZE(sizeof(struct nft_object *)),
89 .eval = nft_objref_eval,
90 .init = nft_objref_init,
91 .activate = nft_objref_activate,
92 .deactivate = nft_objref_deactivate,
93 .dump = nft_objref_dump,
94};
95
96struct nft_objref_map {
97 struct nft_set *set;
98 enum nft_registers sreg:8;
99 struct nft_set_binding binding;
100};
101
102static void nft_objref_map_eval(const struct nft_expr *expr,
103 struct nft_regs *regs,
104 const struct nft_pktinfo *pkt)
105{
106 struct nft_objref_map *priv = nft_expr_priv(expr);
107 const struct nft_set *set = priv->set;
108 const struct nft_set_ext *ext;
109 struct nft_object *obj;
110 bool found;
111
112 found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg],
113 &ext);
114 if (!found) {
115 regs->verdict.code = NFT_BREAK;
116 return;
117 }
118 obj = *nft_set_ext_obj(ext);
119 obj->ops->eval(obj, regs, pkt);
120}
121
122static int nft_objref_map_init(const struct nft_ctx *ctx,
123 const struct nft_expr *expr,
124 const struct nlattr * const tb[])
125{
126 struct nft_objref_map *priv = nft_expr_priv(expr);
127 u8 genmask = nft_genmask_next(ctx->net);
128 struct nft_set *set;
129 int err;
130
131 set = nft_set_lookup_global(ctx->net, ctx->table,
132 tb[NFTA_OBJREF_SET_NAME],
133 tb[NFTA_OBJREF_SET_ID], genmask);
134 if (IS_ERR(set))
135 return PTR_ERR(set);
136
137 if (!(set->flags & NFT_SET_OBJECT))
138 return -EINVAL;
139
140 priv->sreg = nft_parse_register(tb[NFTA_OBJREF_SET_SREG]);
141 err = nft_validate_register_load(priv->sreg, set->klen);
142 if (err < 0)
143 return err;
144
145 priv->binding.flags = set->flags & NFT_SET_OBJECT;
146
147 err = nf_tables_bind_set(ctx, set, &priv->binding);
148 if (err < 0)
149 return err;
150
151 priv->set = set;
152 return 0;
153}
154
155static int nft_objref_map_dump(struct sk_buff *skb, const struct nft_expr *expr)
156{
157 const struct nft_objref_map *priv = nft_expr_priv(expr);
158
159 if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) ||
160 nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name))
161 goto nla_put_failure;
162
163 return 0;
164
165nla_put_failure:
166 return -1;
167}
168
169static void nft_objref_map_deactivate(const struct nft_ctx *ctx,
170 const struct nft_expr *expr,
171 enum nft_trans_phase phase)
172{
173 struct nft_objref_map *priv = nft_expr_priv(expr);
174
175 nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
176}
177
178static void nft_objref_map_activate(const struct nft_ctx *ctx,
179 const struct nft_expr *expr)
180{
181 struct nft_objref_map *priv = nft_expr_priv(expr);
182
183 priv->set->use++;
184}
185
186static void nft_objref_map_destroy(const struct nft_ctx *ctx,
187 const struct nft_expr *expr)
188{
189 struct nft_objref_map *priv = nft_expr_priv(expr);
190
191 nf_tables_destroy_set(ctx, priv->set);
192}
193
194static struct nft_expr_type nft_objref_type;
195static const struct nft_expr_ops nft_objref_map_ops = {
196 .type = &nft_objref_type,
197 .size = NFT_EXPR_SIZE(sizeof(struct nft_objref_map)),
198 .eval = nft_objref_map_eval,
199 .init = nft_objref_map_init,
200 .activate = nft_objref_map_activate,
201 .deactivate = nft_objref_map_deactivate,
202 .destroy = nft_objref_map_destroy,
203 .dump = nft_objref_map_dump,
204};
205
206static const struct nft_expr_ops *
207nft_objref_select_ops(const struct nft_ctx *ctx,
208 const struct nlattr * const tb[])
209{
210 if (tb[NFTA_OBJREF_SET_SREG] &&
211 (tb[NFTA_OBJREF_SET_NAME] ||
212 tb[NFTA_OBJREF_SET_ID]))
213 return &nft_objref_map_ops;
214 else if (tb[NFTA_OBJREF_IMM_NAME] &&
215 tb[NFTA_OBJREF_IMM_TYPE])
216 return &nft_objref_ops;
217
218 return ERR_PTR(-EOPNOTSUPP);
219}
220
221static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = {
222 [NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING,
223 .len = NFT_OBJ_MAXNAMELEN - 1 },
224 [NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 },
225 [NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 },
226 [NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING,
227 .len = NFT_SET_MAXNAMELEN - 1 },
228 [NFTA_OBJREF_SET_ID] = { .type = NLA_U32 },
229};
230
231static struct nft_expr_type nft_objref_type __read_mostly = {
232 .name = "objref",
233 .select_ops = nft_objref_select_ops,
234 .policy = nft_objref_policy,
235 .maxattr = NFTA_OBJREF_MAX,
236 .owner = THIS_MODULE,
237};
238
239static int __init nft_objref_module_init(void)
240{
241 return nft_register_expr(&nft_objref_type);
242}
243
244static void __exit nft_objref_module_exit(void)
245{
246 nft_unregister_expr(&nft_objref_type);
247}
248
249module_init(nft_objref_module_init);
250module_exit(nft_objref_module_exit);
251
252MODULE_LICENSE("GPL");
253MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
254MODULE_ALIAS_NFT_EXPR("objref");