1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015 Patrick McHardy <kaber@trash.net>
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>
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;
25 struct nft_expr *expr_array[NFT_SET_EXPR_MAX];
26 struct nft_set_binding binding;
29 static int nft_dynset_expr_setup(const struct nft_dynset *priv,
30 const struct nft_set_ext *ext)
32 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
33 struct nft_expr *expr;
36 for (i = 0; i < priv->num_exprs; i++) {
37 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
38 if (nft_expr_clone(expr, priv->expr_array[i]) < 0)
41 elem_expr->size += priv->expr_array[i]->ops->size;
47 static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
48 struct nft_regs *regs)
50 const struct nft_dynset *priv = nft_expr_priv(expr);
51 struct nft_set_ext *ext;
55 if (!atomic_add_unless(&set->nelems, 1, set->size))
58 timeout = priv->timeout ? : set->timeout;
59 elem = nft_set_elem_init(set, &priv->tmpl,
60 ®s->data[priv->sreg_key], NULL,
61 ®s->data[priv->sreg_data],
62 timeout, 0, GFP_ATOMIC);
66 ext = nft_set_elem_ext(set, elem);
67 if (priv->num_exprs && nft_dynset_expr_setup(priv, ext) < 0)
73 nft_set_elem_destroy(set, elem, false);
76 atomic_dec(&set->nelems);
80 void nft_dynset_eval(const struct nft_expr *expr,
81 struct nft_regs *regs, const struct nft_pktinfo *pkt)
83 const struct nft_dynset *priv = nft_expr_priv(expr);
84 struct nft_set *set = priv->set;
85 const struct nft_set_ext *ext;
88 if (priv->op == NFT_DYNSET_OP_DELETE) {
89 set->ops->delete(set, ®s->data[priv->sreg_key]);
93 if (set->ops->update(set, ®s->data[priv->sreg_key], nft_dynset_new,
95 if (priv->op == NFT_DYNSET_OP_UPDATE &&
96 nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
97 timeout = priv->timeout ? : set->timeout;
98 *nft_set_ext_expiration(ext) = get_jiffies_64() + timeout;
101 nft_set_elem_update_expr(ext, regs, pkt);
104 regs->verdict.code = NFT_BREAK;
109 regs->verdict.code = NFT_BREAK;
112 static void nft_dynset_ext_add_expr(struct nft_dynset *priv)
117 for (i = 0; i < priv->num_exprs; i++)
118 size += priv->expr_array[i]->ops->size;
120 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPRESSIONS,
121 sizeof(struct nft_set_elem_expr) + size);
124 static struct nft_expr *
125 nft_dynset_expr_alloc(const struct nft_ctx *ctx, const struct nft_set *set,
126 const struct nlattr *attr, int pos)
128 struct nft_expr *expr;
131 expr = nft_set_elem_expr_alloc(ctx, set, attr);
135 if (set->exprs[pos] && set->exprs[pos]->ops != expr->ops) {
137 goto err_dynset_expr;
143 nft_expr_destroy(ctx, expr);
147 static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
148 [NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING,
149 .len = NFT_SET_MAXNAMELEN - 1 },
150 [NFTA_DYNSET_SET_ID] = { .type = NLA_U32 },
151 [NFTA_DYNSET_OP] = { .type = NLA_U32 },
152 [NFTA_DYNSET_SREG_KEY] = { .type = NLA_U32 },
153 [NFTA_DYNSET_SREG_DATA] = { .type = NLA_U32 },
154 [NFTA_DYNSET_TIMEOUT] = { .type = NLA_U64 },
155 [NFTA_DYNSET_EXPR] = { .type = NLA_NESTED },
156 [NFTA_DYNSET_FLAGS] = { .type = NLA_U32 },
157 [NFTA_DYNSET_EXPRESSIONS] = { .type = NLA_NESTED },
160 static int nft_dynset_init(const struct nft_ctx *ctx,
161 const struct nft_expr *expr,
162 const struct nlattr * const tb[])
164 struct nft_dynset *priv = nft_expr_priv(expr);
165 u8 genmask = nft_genmask_next(ctx->net);
170 lockdep_assert_held(&ctx->net->nft.commit_mutex);
172 if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
173 tb[NFTA_DYNSET_OP] == NULL ||
174 tb[NFTA_DYNSET_SREG_KEY] == NULL)
177 if (tb[NFTA_DYNSET_FLAGS]) {
178 u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
179 if (flags & ~(NFT_DYNSET_F_INV | NFT_DYNSET_F_EXPR))
181 if (flags & NFT_DYNSET_F_INV)
183 if (flags & NFT_DYNSET_F_EXPR)
187 set = nft_set_lookup_global(ctx->net, ctx->table,
188 tb[NFTA_DYNSET_SET_NAME],
189 tb[NFTA_DYNSET_SET_ID], genmask);
193 if (set->ops->update == NULL)
196 if (set->flags & NFT_SET_CONSTANT)
199 priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
201 case NFT_DYNSET_OP_ADD:
202 case NFT_DYNSET_OP_DELETE:
204 case NFT_DYNSET_OP_UPDATE:
205 if (!(set->flags & NFT_SET_TIMEOUT))
213 if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
214 if (!(set->flags & NFT_SET_TIMEOUT))
217 err = nf_msecs_to_jiffies64(tb[NFTA_DYNSET_TIMEOUT], &timeout);
222 priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]);
223 err = nft_validate_register_load(priv->sreg_key, set->klen);
227 if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
228 if (!(set->flags & NFT_SET_MAP))
230 if (set->dtype == NFT_DATA_VERDICT)
233 priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]);
234 err = nft_validate_register_load(priv->sreg_data, set->dlen);
237 } else if (set->flags & NFT_SET_MAP)
240 if ((tb[NFTA_DYNSET_EXPR] || tb[NFTA_DYNSET_EXPRESSIONS]) &&
241 !(set->flags & NFT_SET_EVAL))
244 if (tb[NFTA_DYNSET_EXPR]) {
245 struct nft_expr *dynset_expr;
247 dynset_expr = nft_dynset_expr_alloc(ctx, set,
248 tb[NFTA_DYNSET_EXPR], 0);
249 if (IS_ERR(dynset_expr))
250 return PTR_ERR(dynset_expr);
253 priv->expr_array[0] = dynset_expr;
255 if (set->num_exprs > 1 ||
256 (set->num_exprs == 1 &&
257 dynset_expr->ops != set->exprs[0]->ops)) {
261 } else if (tb[NFTA_DYNSET_EXPRESSIONS]) {
262 struct nft_expr *dynset_expr;
270 nla_for_each_nested(tmp, tb[NFTA_DYNSET_EXPRESSIONS], left) {
271 if (i == NFT_SET_EXPR_MAX) {
275 if (nla_type(tmp) != NFTA_LIST_ELEM) {
279 dynset_expr = nft_dynset_expr_alloc(ctx, set, tmp, i);
280 if (IS_ERR(dynset_expr)) {
281 err = PTR_ERR(dynset_expr);
284 priv->expr_array[i] = dynset_expr;
287 if (set->num_exprs &&
288 dynset_expr->ops != set->exprs[i]->ops) {
294 if (set->num_exprs && set->num_exprs != i) {
298 } else if (set->num_exprs > 0) {
299 err = nft_set_elem_expr_clone(ctx, set, priv->expr_array);
303 priv->num_exprs = set->num_exprs;
306 nft_set_ext_prepare(&priv->tmpl);
307 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
308 if (set->flags & NFT_SET_MAP)
309 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
312 nft_dynset_ext_add_expr(priv);
314 if (set->flags & NFT_SET_TIMEOUT) {
315 if (timeout || set->timeout) {
316 nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT);
317 nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
321 priv->timeout = timeout;
323 err = nf_tables_bind_set(ctx, set, &priv->binding);
334 for (i = 0; i < priv->num_exprs; i++)
335 nft_expr_destroy(ctx, priv->expr_array[i]);
339 static void nft_dynset_deactivate(const struct nft_ctx *ctx,
340 const struct nft_expr *expr,
341 enum nft_trans_phase phase)
343 struct nft_dynset *priv = nft_expr_priv(expr);
345 nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
348 static void nft_dynset_activate(const struct nft_ctx *ctx,
349 const struct nft_expr *expr)
351 struct nft_dynset *priv = nft_expr_priv(expr);
356 static void nft_dynset_destroy(const struct nft_ctx *ctx,
357 const struct nft_expr *expr)
359 struct nft_dynset *priv = nft_expr_priv(expr);
362 for (i = 0; i < priv->num_exprs; i++)
363 nft_expr_destroy(ctx, priv->expr_array[i]);
365 nf_tables_destroy_set(ctx, priv->set);
368 static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
370 const struct nft_dynset *priv = nft_expr_priv(expr);
371 u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
374 if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
375 goto nla_put_failure;
376 if (priv->set->flags & NFT_SET_MAP &&
377 nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
378 goto nla_put_failure;
379 if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
380 goto nla_put_failure;
381 if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
382 goto nla_put_failure;
383 if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
384 nf_jiffies64_to_msecs(priv->timeout),
386 goto nla_put_failure;
387 if (priv->set->num_exprs == 0) {
388 if (priv->num_exprs == 1) {
389 if (nft_expr_dump(skb, NFTA_DYNSET_EXPR,
390 priv->expr_array[0]))
391 goto nla_put_failure;
392 } else if (priv->num_exprs > 1) {
395 nest = nla_nest_start_noflag(skb, NFTA_DYNSET_EXPRESSIONS);
397 goto nla_put_failure;
399 for (i = 0; i < priv->num_exprs; i++) {
400 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
401 priv->expr_array[i]))
402 goto nla_put_failure;
404 nla_nest_end(skb, nest);
407 if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
408 goto nla_put_failure;
415 static const struct nft_expr_ops nft_dynset_ops = {
416 .type = &nft_dynset_type,
417 .size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
418 .eval = nft_dynset_eval,
419 .init = nft_dynset_init,
420 .destroy = nft_dynset_destroy,
421 .activate = nft_dynset_activate,
422 .deactivate = nft_dynset_deactivate,
423 .dump = nft_dynset_dump,
426 struct nft_expr_type nft_dynset_type __read_mostly = {
428 .ops = &nft_dynset_ops,
429 .policy = nft_dynset_policy,
430 .maxattr = NFTA_DYNSET_MAX,
431 .owner = THIS_MODULE,