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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_core.h>
13
14#define nft_objref_priv(expr) *((struct nft_object **)nft_expr_priv(expr))
15
16void 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 if (!nft_use_inc(&obj->use))
45 return -EMFILE;
46
47 nft_objref_priv(expr) = obj;
48
49 return 0;
50}
51
52static int nft_objref_dump(struct sk_buff *skb,
53 const struct nft_expr *expr, bool reset)
54{
55 const struct nft_object *obj = nft_objref_priv(expr);
56
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)))
60 goto nla_put_failure;
61
62 return 0;
63
64nla_put_failure:
65 return -1;
66}
67
68static void nft_objref_deactivate(const struct nft_ctx *ctx,
69 const struct nft_expr *expr,
70 enum nft_trans_phase phase)
71{
72 struct nft_object *obj = nft_objref_priv(expr);
73
74 if (phase == NFT_TRANS_COMMIT)
75 return;
76
77 nft_use_dec(&obj->use);
78}
79
80static void nft_objref_activate(const struct nft_ctx *ctx,
81 const struct nft_expr *expr)
82{
83 struct nft_object *obj = nft_objref_priv(expr);
84
85 nft_use_inc_restore(&obj->use);
86}
87
88static const struct nft_expr_ops nft_objref_ops = {
89 .type = &nft_objref_type,
90 .size = NFT_EXPR_SIZE(sizeof(struct nft_object *)),
91 .eval = nft_objref_eval,
92 .init = nft_objref_init,
93 .activate = nft_objref_activate,
94 .deactivate = nft_objref_deactivate,
95 .dump = nft_objref_dump,
96 .reduce = NFT_REDUCE_READONLY,
97};
98
99struct nft_objref_map {
100 struct nft_set *set;
101 u8 sreg;
102 struct nft_set_binding binding;
103};
104
105void nft_objref_map_eval(const struct nft_expr *expr,
106 struct nft_regs *regs,
107 const struct nft_pktinfo *pkt)
108{
109 struct nft_objref_map *priv = nft_expr_priv(expr);
110 const struct nft_set *set = priv->set;
111 struct net *net = nft_net(pkt);
112 const struct nft_set_ext *ext;
113 struct nft_object *obj;
114 bool found;
115
116 found = nft_set_do_lookup(net, set, ®s->data[priv->sreg], &ext);
117 if (!found) {
118 ext = nft_set_catchall_lookup(net, set);
119 if (!ext) {
120 regs->verdict.code = NFT_BREAK;
121 return;
122 }
123 }
124 obj = *nft_set_ext_obj(ext);
125 obj->ops->eval(obj, regs, pkt);
126}
127
128static int nft_objref_map_init(const struct nft_ctx *ctx,
129 const struct nft_expr *expr,
130 const struct nlattr * const tb[])
131{
132 struct nft_objref_map *priv = nft_expr_priv(expr);
133 u8 genmask = nft_genmask_next(ctx->net);
134 struct nft_set *set;
135 int err;
136
137 set = nft_set_lookup_global(ctx->net, ctx->table,
138 tb[NFTA_OBJREF_SET_NAME],
139 tb[NFTA_OBJREF_SET_ID], genmask);
140 if (IS_ERR(set))
141 return PTR_ERR(set);
142
143 if (!(set->flags & NFT_SET_OBJECT))
144 return -EINVAL;
145
146 err = nft_parse_register_load(ctx, tb[NFTA_OBJREF_SET_SREG], &priv->sreg,
147 set->klen);
148 if (err < 0)
149 return err;
150
151 priv->binding.flags = set->flags & NFT_SET_OBJECT;
152
153 err = nf_tables_bind_set(ctx, set, &priv->binding);
154 if (err < 0)
155 return err;
156
157 priv->set = set;
158 return 0;
159}
160
161static int nft_objref_map_dump(struct sk_buff *skb,
162 const struct nft_expr *expr, bool reset)
163{
164 const struct nft_objref_map *priv = nft_expr_priv(expr);
165
166 if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) ||
167 nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name))
168 goto nla_put_failure;
169
170 return 0;
171
172nla_put_failure:
173 return -1;
174}
175
176static void nft_objref_map_deactivate(const struct nft_ctx *ctx,
177 const struct nft_expr *expr,
178 enum nft_trans_phase phase)
179{
180 struct nft_objref_map *priv = nft_expr_priv(expr);
181
182 nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
183}
184
185static void nft_objref_map_activate(const struct nft_ctx *ctx,
186 const struct nft_expr *expr)
187{
188 struct nft_objref_map *priv = nft_expr_priv(expr);
189
190 nf_tables_activate_set(ctx, priv->set);
191}
192
193static void nft_objref_map_destroy(const struct nft_ctx *ctx,
194 const struct nft_expr *expr)
195{
196 struct nft_objref_map *priv = nft_expr_priv(expr);
197
198 nf_tables_destroy_set(ctx, priv->set);
199}
200
201static const struct nft_expr_ops nft_objref_map_ops = {
202 .type = &nft_objref_type,
203 .size = NFT_EXPR_SIZE(sizeof(struct nft_objref_map)),
204 .eval = nft_objref_map_eval,
205 .init = nft_objref_map_init,
206 .activate = nft_objref_map_activate,
207 .deactivate = nft_objref_map_deactivate,
208 .destroy = nft_objref_map_destroy,
209 .dump = nft_objref_map_dump,
210 .reduce = NFT_REDUCE_READONLY,
211};
212
213static const struct nft_expr_ops *
214nft_objref_select_ops(const struct nft_ctx *ctx,
215 const struct nlattr * const tb[])
216{
217 if (tb[NFTA_OBJREF_SET_SREG] &&
218 (tb[NFTA_OBJREF_SET_NAME] ||
219 tb[NFTA_OBJREF_SET_ID]))
220 return &nft_objref_map_ops;
221 else if (tb[NFTA_OBJREF_IMM_NAME] &&
222 tb[NFTA_OBJREF_IMM_TYPE])
223 return &nft_objref_ops;
224
225 return ERR_PTR(-EOPNOTSUPP);
226}
227
228static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = {
229 [NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING,
230 .len = NFT_OBJ_MAXNAMELEN - 1 },
231 [NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 },
232 [NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 },
233 [NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING,
234 .len = NFT_SET_MAXNAMELEN - 1 },
235 [NFTA_OBJREF_SET_ID] = { .type = NLA_U32 },
236};
237
238struct nft_expr_type nft_objref_type __read_mostly = {
239 .name = "objref",
240 .select_ops = nft_objref_select_ops,
241 .policy = nft_objref_policy,
242 .maxattr = NFTA_OBJREF_MAX,
243 .owner = THIS_MODULE,
244};