Commit | Line | Data |
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c97d22e6 PNA |
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 | ||
19 | static 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 | ||
dfc46034 | 25 | obj->ops->eval(obj, regs, pkt); |
c97d22e6 PNA |
26 | } |
27 | ||
28 | static 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])); | |
4d44175a FW |
41 | obj = nft_obj_lookup(ctx->net, ctx->table, |
42 | tb[NFTA_OBJREF_IMM_NAME], objtype, | |
cac20fcd | 43 | genmask); |
c97d22e6 PNA |
44 | if (IS_ERR(obj)) |
45 | return -ENOENT; | |
46 | ||
47 | nft_objref_priv(expr) = obj; | |
48 | obj->use++; | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int nft_objref_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
54 | { | |
55 | const struct nft_object *obj = nft_objref_priv(expr); | |
56 | ||
d152159b | 57 | if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->key.name) || |
dfc46034 PBG |
58 | nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE, |
59 | htonl(obj->ops->type->type))) | |
c97d22e6 PNA |
60 | goto nla_put_failure; |
61 | ||
62 | return 0; | |
63 | ||
64 | nla_put_failure: | |
65 | return -1; | |
66 | } | |
67 | ||
8ffcd32f PNA |
68 | static void nft_objref_deactivate(const struct nft_ctx *ctx, |
69 | const struct nft_expr *expr, | |
70 | enum nft_trans_phase phase) | |
c97d22e6 PNA |
71 | { |
72 | struct nft_object *obj = nft_objref_priv(expr); | |
73 | ||
8ffcd32f PNA |
74 | if (phase == NFT_TRANS_COMMIT) |
75 | return; | |
76 | ||
c97d22e6 PNA |
77 | obj->use--; |
78 | } | |
79 | ||
8ffcd32f PNA |
80 | static 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 | obj->use++; | |
86 | } | |
87 | ||
c97d22e6 PNA |
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, | |
8ffcd32f PNA |
94 | .activate = nft_objref_activate, |
95 | .deactivate = nft_objref_deactivate, | |
c97d22e6 PNA |
96 | .dump = nft_objref_dump, |
97 | }; | |
98 | ||
63aea290 PNA |
99 | struct nft_objref_map { |
100 | struct nft_set *set; | |
101 | enum nft_registers sreg:8; | |
102 | struct nft_set_binding binding; | |
103 | }; | |
104 | ||
105 | static void 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 | const struct nft_set_ext *ext; | |
112 | struct nft_object *obj; | |
113 | bool found; | |
114 | ||
115 | found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg], | |
116 | &ext); | |
117 | if (!found) { | |
118 | regs->verdict.code = NFT_BREAK; | |
119 | return; | |
120 | } | |
121 | obj = *nft_set_ext_obj(ext); | |
dfc46034 | 122 | obj->ops->eval(obj, regs, pkt); |
63aea290 PNA |
123 | } |
124 | ||
125 | static int nft_objref_map_init(const struct nft_ctx *ctx, | |
126 | const struct nft_expr *expr, | |
127 | const struct nlattr * const tb[]) | |
128 | { | |
129 | struct nft_objref_map *priv = nft_expr_priv(expr); | |
130 | u8 genmask = nft_genmask_next(ctx->net); | |
131 | struct nft_set *set; | |
132 | int err; | |
133 | ||
10659cba PNA |
134 | set = nft_set_lookup_global(ctx->net, ctx->table, |
135 | tb[NFTA_OBJREF_SET_NAME], | |
136 | tb[NFTA_OBJREF_SET_ID], genmask); | |
c7a72e3f PNA |
137 | if (IS_ERR(set)) |
138 | return PTR_ERR(set); | |
63aea290 PNA |
139 | |
140 | if (!(set->flags & NFT_SET_OBJECT)) | |
141 | return -EINVAL; | |
142 | ||
143 | priv->sreg = nft_parse_register(tb[NFTA_OBJREF_SET_SREG]); | |
144 | err = nft_validate_register_load(priv->sreg, set->klen); | |
145 | if (err < 0) | |
146 | return err; | |
147 | ||
148 | priv->binding.flags = set->flags & NFT_SET_OBJECT; | |
149 | ||
150 | err = nf_tables_bind_set(ctx, set, &priv->binding); | |
151 | if (err < 0) | |
152 | return err; | |
153 | ||
154 | priv->set = set; | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static int nft_objref_map_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
159 | { | |
160 | const struct nft_objref_map *priv = nft_expr_priv(expr); | |
161 | ||
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; | |
165 | ||
166 | return 0; | |
167 | ||
168 | nla_put_failure: | |
169 | return -1; | |
170 | } | |
171 | ||
cd5125d8 | 172 | static void nft_objref_map_deactivate(const struct nft_ctx *ctx, |
f6ac8585 PNA |
173 | const struct nft_expr *expr, |
174 | enum nft_trans_phase phase) | |
cd5125d8 FW |
175 | { |
176 | struct nft_objref_map *priv = nft_expr_priv(expr); | |
177 | ||
273fe3f1 PNA |
178 | nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase); |
179 | } | |
180 | ||
181 | static void nft_objref_map_activate(const struct nft_ctx *ctx, | |
182 | const struct nft_expr *expr) | |
183 | { | |
184 | struct nft_objref_map *priv = nft_expr_priv(expr); | |
f6ac8585 | 185 | |
273fe3f1 | 186 | priv->set->use++; |
cd5125d8 FW |
187 | } |
188 | ||
63aea290 PNA |
189 | static void nft_objref_map_destroy(const struct nft_ctx *ctx, |
190 | const struct nft_expr *expr) | |
191 | { | |
192 | struct nft_objref_map *priv = nft_expr_priv(expr); | |
193 | ||
cd5125d8 | 194 | nf_tables_destroy_set(ctx, priv->set); |
63aea290 PNA |
195 | } |
196 | ||
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, | |
273fe3f1 | 203 | .activate = nft_objref_map_activate, |
cd5125d8 | 204 | .deactivate = nft_objref_map_deactivate, |
63aea290 PNA |
205 | .destroy = nft_objref_map_destroy, |
206 | .dump = nft_objref_map_dump, | |
207 | }; | |
208 | ||
209 | static const struct nft_expr_ops * | |
210 | nft_objref_select_ops(const struct nft_ctx *ctx, | |
211 | const struct nlattr * const tb[]) | |
212 | { | |
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; | |
220 | ||
221 | return ERR_PTR(-EOPNOTSUPP); | |
222 | } | |
223 | ||
c97d22e6 | 224 | static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = { |
b2fbd044 LZ |
225 | [NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING, |
226 | .len = NFT_OBJ_MAXNAMELEN - 1 }, | |
c97d22e6 | 227 | [NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 }, |
63aea290 | 228 | [NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 }, |
b2fbd044 LZ |
229 | [NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING, |
230 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
63aea290 | 231 | [NFTA_OBJREF_SET_ID] = { .type = NLA_U32 }, |
c97d22e6 PNA |
232 | }; |
233 | ||
234 | static struct nft_expr_type nft_objref_type __read_mostly = { | |
235 | .name = "objref", | |
63aea290 | 236 | .select_ops = nft_objref_select_ops, |
c97d22e6 PNA |
237 | .policy = nft_objref_policy, |
238 | .maxattr = NFTA_OBJREF_MAX, | |
239 | .owner = THIS_MODULE, | |
240 | }; | |
241 | ||
242 | static int __init nft_objref_module_init(void) | |
243 | { | |
244 | return nft_register_expr(&nft_objref_type); | |
245 | } | |
246 | ||
247 | static void __exit nft_objref_module_exit(void) | |
248 | { | |
249 | nft_unregister_expr(&nft_objref_type); | |
250 | } | |
251 | ||
252 | module_init(nft_objref_module_init); | |
253 | module_exit(nft_objref_module_exit); | |
254 | ||
255 | MODULE_LICENSE("GPL"); | |
256 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
257 | MODULE_ALIAS_NFT_EXPR("objref"); |