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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
22fe54d5 PM |
2 | /* |
3 | * Copyright (c) 2015 Patrick McHardy <kaber@trash.net> | |
22fe54d5 PM |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/init.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 | #include <net/netfilter/nf_tables_core.h> | |
14 | ||
15 | struct nft_dynset { | |
16 | struct nft_set *set; | |
17 | struct nft_set_ext_tmpl tmpl; | |
18 | enum nft_dynset_ops op:8; | |
19 | enum nft_registers sreg_key:8; | |
20 | enum nft_registers sreg_data:8; | |
dbd2be06 | 21 | bool invert; |
22fe54d5 | 22 | u64 timeout; |
3e135cd4 | 23 | struct nft_expr *expr; |
22fe54d5 PM |
24 | struct nft_set_binding binding; |
25 | }; | |
26 | ||
f1f86d09 PG |
27 | static int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) |
28 | { | |
29 | int err; | |
30 | ||
31 | if (src->ops->clone) { | |
32 | dst->ops = src->ops; | |
33 | err = src->ops->clone(dst, src); | |
34 | if (err < 0) | |
35 | return err; | |
36 | } else { | |
37 | memcpy(dst, src, src->ops->size); | |
38 | } | |
39 | ||
40 | __module_get(src->ops->type->owner); | |
41 | return 0; | |
42 | } | |
43 | ||
22fe54d5 | 44 | static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr, |
a55e22e9 | 45 | struct nft_regs *regs) |
22fe54d5 PM |
46 | { |
47 | const struct nft_dynset *priv = nft_expr_priv(expr); | |
3e135cd4 | 48 | struct nft_set_ext *ext; |
22fe54d5 PM |
49 | u64 timeout; |
50 | void *elem; | |
51 | ||
99a0efbe | 52 | if (!atomic_add_unless(&set->nelems, 1, set->size)) |
22fe54d5 PM |
53 | return NULL; |
54 | ||
55 | timeout = priv->timeout ? : set->timeout; | |
56 | elem = nft_set_elem_init(set, &priv->tmpl, | |
a55e22e9 PM |
57 | ®s->data[priv->sreg_key], |
58 | ®s->data[priv->sreg_data], | |
22fe54d5 | 59 | timeout, GFP_ATOMIC); |
61f9e292 LZ |
60 | if (elem == NULL) |
61 | goto err1; | |
3e135cd4 PM |
62 | |
63 | ext = nft_set_elem_ext(set, elem); | |
086f3321 PNA |
64 | if (priv->expr != NULL && |
65 | nft_expr_clone(nft_set_ext_expr(ext), priv->expr) < 0) | |
61f9e292 | 66 | goto err2; |
3e135cd4 | 67 | |
22fe54d5 | 68 | return elem; |
61f9e292 LZ |
69 | |
70 | err2: | |
71 | nft_set_elem_destroy(set, elem, false); | |
72 | err1: | |
73 | if (set->size) | |
74 | atomic_dec(&set->nelems); | |
75 | return NULL; | |
22fe54d5 PM |
76 | } |
77 | ||
10870dd8 FW |
78 | void nft_dynset_eval(const struct nft_expr *expr, |
79 | struct nft_regs *regs, const struct nft_pktinfo *pkt) | |
22fe54d5 PM |
80 | { |
81 | const struct nft_dynset *priv = nft_expr_priv(expr); | |
82 | struct nft_set *set = priv->set; | |
83 | const struct nft_set_ext *ext; | |
3e135cd4 | 84 | const struct nft_expr *sexpr; |
22fe54d5 PM |
85 | u64 timeout; |
86 | ||
a55e22e9 PM |
87 | if (set->ops->update(set, ®s->data[priv->sreg_key], nft_dynset_new, |
88 | expr, regs, &ext)) { | |
3e135cd4 PM |
89 | sexpr = NULL; |
90 | if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) | |
91 | sexpr = nft_set_ext_expr(ext); | |
92 | ||
22fe54d5 PM |
93 | if (priv->op == NFT_DYNSET_OP_UPDATE && |
94 | nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { | |
95 | timeout = priv->timeout ? : set->timeout; | |
b13468dc | 96 | *nft_set_ext_expiration(ext) = get_jiffies_64() + timeout; |
277a2928 | 97 | } |
22fe54d5 | 98 | |
3e135cd4 PM |
99 | if (sexpr != NULL) |
100 | sexpr->ops->eval(sexpr, regs, pkt); | |
dbd2be06 PNA |
101 | |
102 | if (priv->invert) | |
103 | regs->verdict.code = NFT_BREAK; | |
3e135cd4 PM |
104 | return; |
105 | } | |
277a2928 | 106 | |
dbd2be06 PNA |
107 | if (!priv->invert) |
108 | regs->verdict.code = NFT_BREAK; | |
22fe54d5 PM |
109 | } |
110 | ||
111 | static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = { | |
b2fbd044 LZ |
112 | [NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING, |
113 | .len = NFT_SET_MAXNAMELEN - 1 }, | |
22fe54d5 PM |
114 | [NFTA_DYNSET_SET_ID] = { .type = NLA_U32 }, |
115 | [NFTA_DYNSET_OP] = { .type = NLA_U32 }, | |
116 | [NFTA_DYNSET_SREG_KEY] = { .type = NLA_U32 }, | |
117 | [NFTA_DYNSET_SREG_DATA] = { .type = NLA_U32 }, | |
118 | [NFTA_DYNSET_TIMEOUT] = { .type = NLA_U64 }, | |
3e135cd4 | 119 | [NFTA_DYNSET_EXPR] = { .type = NLA_NESTED }, |
dbd2be06 | 120 | [NFTA_DYNSET_FLAGS] = { .type = NLA_U32 }, |
22fe54d5 PM |
121 | }; |
122 | ||
123 | static int nft_dynset_init(const struct nft_ctx *ctx, | |
124 | const struct nft_expr *expr, | |
125 | const struct nlattr * const tb[]) | |
126 | { | |
127 | struct nft_dynset *priv = nft_expr_priv(expr); | |
37a9cc52 | 128 | u8 genmask = nft_genmask_next(ctx->net); |
22fe54d5 PM |
129 | struct nft_set *set; |
130 | u64 timeout; | |
131 | int err; | |
132 | ||
f102d66b FW |
133 | lockdep_assert_held(&ctx->net->nft.commit_mutex); |
134 | ||
22fe54d5 PM |
135 | if (tb[NFTA_DYNSET_SET_NAME] == NULL || |
136 | tb[NFTA_DYNSET_OP] == NULL || | |
137 | tb[NFTA_DYNSET_SREG_KEY] == NULL) | |
138 | return -EINVAL; | |
139 | ||
dbd2be06 PNA |
140 | if (tb[NFTA_DYNSET_FLAGS]) { |
141 | u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS])); | |
142 | ||
143 | if (flags & ~NFT_DYNSET_F_INV) | |
144 | return -EINVAL; | |
145 | if (flags & NFT_DYNSET_F_INV) | |
146 | priv->invert = true; | |
147 | } | |
148 | ||
10659cba PNA |
149 | set = nft_set_lookup_global(ctx->net, ctx->table, |
150 | tb[NFTA_DYNSET_SET_NAME], | |
151 | tb[NFTA_DYNSET_SET_ID], genmask); | |
c7a72e3f PNA |
152 | if (IS_ERR(set)) |
153 | return PTR_ERR(set); | |
22fe54d5 | 154 | |
bb6a6e8e LZ |
155 | if (set->ops->update == NULL) |
156 | return -EOPNOTSUPP; | |
157 | ||
22fe54d5 PM |
158 | if (set->flags & NFT_SET_CONSTANT) |
159 | return -EBUSY; | |
160 | ||
161 | priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP])); | |
162 | switch (priv->op) { | |
163 | case NFT_DYNSET_OP_ADD: | |
164 | break; | |
165 | case NFT_DYNSET_OP_UPDATE: | |
166 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
167 | return -EOPNOTSUPP; | |
168 | break; | |
169 | default: | |
170 | return -EOPNOTSUPP; | |
171 | } | |
172 | ||
173 | timeout = 0; | |
174 | if (tb[NFTA_DYNSET_TIMEOUT] != NULL) { | |
175 | if (!(set->flags & NFT_SET_TIMEOUT)) | |
176 | return -EINVAL; | |
a8b1e36d AP |
177 | timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64( |
178 | tb[NFTA_DYNSET_TIMEOUT]))); | |
22fe54d5 PM |
179 | } |
180 | ||
b1c96ed3 | 181 | priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]); |
b0c3dc65 | 182 | err = nft_validate_register_load(priv->sreg_key, set->klen); |
22fe54d5 PM |
183 | if (err < 0) |
184 | return err; | |
185 | ||
186 | if (tb[NFTA_DYNSET_SREG_DATA] != NULL) { | |
187 | if (!(set->flags & NFT_SET_MAP)) | |
188 | return -EINVAL; | |
189 | if (set->dtype == NFT_DATA_VERDICT) | |
190 | return -EOPNOTSUPP; | |
191 | ||
b1c96ed3 | 192 | priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]); |
d07db988 | 193 | err = nft_validate_register_load(priv->sreg_data, set->dlen); |
22fe54d5 PM |
194 | if (err < 0) |
195 | return err; | |
196 | } else if (set->flags & NFT_SET_MAP) | |
197 | return -EINVAL; | |
198 | ||
3e135cd4 PM |
199 | if (tb[NFTA_DYNSET_EXPR] != NULL) { |
200 | if (!(set->flags & NFT_SET_EVAL)) | |
201 | return -EINVAL; | |
3e135cd4 PM |
202 | |
203 | priv->expr = nft_expr_init(ctx, tb[NFTA_DYNSET_EXPR]); | |
204 | if (IS_ERR(priv->expr)) | |
205 | return PTR_ERR(priv->expr); | |
206 | ||
207 | err = -EOPNOTSUPP; | |
208 | if (!(priv->expr->ops->type->flags & NFT_EXPR_STATEFUL)) | |
209 | goto err1; | |
79b174ad PNA |
210 | |
211 | if (priv->expr->ops->type->flags & NFT_EXPR_GC) { | |
212 | if (set->flags & NFT_SET_TIMEOUT) | |
213 | goto err1; | |
214 | if (!set->ops->gc_init) | |
215 | goto err1; | |
216 | set->ops->gc_init(set); | |
217 | } | |
215a31f1 | 218 | } |
3e135cd4 | 219 | |
22fe54d5 PM |
220 | nft_set_ext_prepare(&priv->tmpl); |
221 | nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen); | |
222 | if (set->flags & NFT_SET_MAP) | |
223 | nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen); | |
3e135cd4 PM |
224 | if (priv->expr != NULL) |
225 | nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPR, | |
226 | priv->expr->ops->size); | |
22fe54d5 PM |
227 | if (set->flags & NFT_SET_TIMEOUT) { |
228 | if (timeout || set->timeout) | |
229 | nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION); | |
230 | } | |
231 | ||
232 | priv->timeout = timeout; | |
233 | ||
234 | err = nf_tables_bind_set(ctx, set, &priv->binding); | |
235 | if (err < 0) | |
3e135cd4 | 236 | goto err1; |
22fe54d5 | 237 | |
99a0efbe FW |
238 | if (set->size == 0) |
239 | set->size = 0xffff; | |
240 | ||
22fe54d5 PM |
241 | priv->set = set; |
242 | return 0; | |
3e135cd4 PM |
243 | |
244 | err1: | |
245 | if (priv->expr != NULL) | |
246 | nft_expr_destroy(ctx, priv->expr); | |
247 | return err; | |
22fe54d5 PM |
248 | } |
249 | ||
cd5125d8 | 250 | static void nft_dynset_deactivate(const struct nft_ctx *ctx, |
f6ac8585 PNA |
251 | const struct nft_expr *expr, |
252 | enum nft_trans_phase phase) | |
cd5125d8 FW |
253 | { |
254 | struct nft_dynset *priv = nft_expr_priv(expr); | |
255 | ||
273fe3f1 PNA |
256 | nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase); |
257 | } | |
258 | ||
259 | static void nft_dynset_activate(const struct nft_ctx *ctx, | |
260 | const struct nft_expr *expr) | |
261 | { | |
262 | struct nft_dynset *priv = nft_expr_priv(expr); | |
f6ac8585 | 263 | |
273fe3f1 | 264 | priv->set->use++; |
cd5125d8 FW |
265 | } |
266 | ||
22fe54d5 PM |
267 | static void nft_dynset_destroy(const struct nft_ctx *ctx, |
268 | const struct nft_expr *expr) | |
269 | { | |
270 | struct nft_dynset *priv = nft_expr_priv(expr); | |
271 | ||
3e135cd4 PM |
272 | if (priv->expr != NULL) |
273 | nft_expr_destroy(ctx, priv->expr); | |
cd5125d8 FW |
274 | |
275 | nf_tables_destroy_set(ctx, priv->set); | |
22fe54d5 PM |
276 | } |
277 | ||
278 | static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
279 | { | |
280 | const struct nft_dynset *priv = nft_expr_priv(expr); | |
dbd2be06 | 281 | u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0; |
22fe54d5 | 282 | |
b1c96ed3 | 283 | if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key)) |
22fe54d5 PM |
284 | goto nla_put_failure; |
285 | if (priv->set->flags & NFT_SET_MAP && | |
b1c96ed3 | 286 | nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data)) |
22fe54d5 PM |
287 | goto nla_put_failure; |
288 | if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op))) | |
289 | goto nla_put_failure; | |
290 | if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name)) | |
291 | goto nla_put_failure; | |
a8b1e36d AP |
292 | if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT, |
293 | cpu_to_be64(jiffies_to_msecs(priv->timeout)), | |
b46f6ded | 294 | NFTA_DYNSET_PAD)) |
22fe54d5 | 295 | goto nla_put_failure; |
3e135cd4 PM |
296 | if (priv->expr && nft_expr_dump(skb, NFTA_DYNSET_EXPR, priv->expr)) |
297 | goto nla_put_failure; | |
dbd2be06 PNA |
298 | if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags))) |
299 | goto nla_put_failure; | |
22fe54d5 PM |
300 | return 0; |
301 | ||
302 | nla_put_failure: | |
303 | return -1; | |
304 | } | |
305 | ||
22fe54d5 PM |
306 | static const struct nft_expr_ops nft_dynset_ops = { |
307 | .type = &nft_dynset_type, | |
308 | .size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)), | |
309 | .eval = nft_dynset_eval, | |
310 | .init = nft_dynset_init, | |
311 | .destroy = nft_dynset_destroy, | |
273fe3f1 | 312 | .activate = nft_dynset_activate, |
cd5125d8 | 313 | .deactivate = nft_dynset_deactivate, |
22fe54d5 PM |
314 | .dump = nft_dynset_dump, |
315 | }; | |
316 | ||
4e24877e | 317 | struct nft_expr_type nft_dynset_type __read_mostly = { |
22fe54d5 PM |
318 | .name = "dynset", |
319 | .ops = &nft_dynset_ops, | |
320 | .policy = nft_dynset_policy, | |
321 | .maxattr = NFTA_DYNSET_MAX, | |
322 | .owner = THIS_MODULE, | |
323 | }; |