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;
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 nftables_pernet *nft_net = nft_pernet(ctx->net);
165 struct nft_dynset *priv = nft_expr_priv(expr);
166 u8 genmask = nft_genmask_next(ctx->net);
171 lockdep_assert_held(&nft_net->commit_mutex);
173 if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
174 tb[NFTA_DYNSET_OP] == NULL ||
175 tb[NFTA_DYNSET_SREG_KEY] == NULL)
178 if (tb[NFTA_DYNSET_FLAGS]) {
179 u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
180 if (flags & ~(NFT_DYNSET_F_INV | NFT_DYNSET_F_EXPR))
182 if (flags & NFT_DYNSET_F_INV)
184 if (flags & NFT_DYNSET_F_EXPR)
188 set = nft_set_lookup_global(ctx->net, ctx->table,
189 tb[NFTA_DYNSET_SET_NAME],
190 tb[NFTA_DYNSET_SET_ID], genmask);
194 if (set->ops->update == NULL)
197 if (set->flags & NFT_SET_CONSTANT)
200 priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
202 case NFT_DYNSET_OP_ADD:
203 case NFT_DYNSET_OP_DELETE:
205 case NFT_DYNSET_OP_UPDATE:
206 if (!(set->flags & NFT_SET_TIMEOUT))
214 if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
215 if (!(set->flags & NFT_SET_TIMEOUT))
218 err = nf_msecs_to_jiffies64(tb[NFTA_DYNSET_TIMEOUT], &timeout);
223 err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_KEY], &priv->sreg_key,
228 if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
229 if (!(set->flags & NFT_SET_MAP))
231 if (set->dtype == NFT_DATA_VERDICT)
234 err = nft_parse_register_load(tb[NFTA_DYNSET_SREG_DATA],
235 &priv->sreg_data, set->dlen);
238 } else if (set->flags & NFT_SET_MAP)
241 if ((tb[NFTA_DYNSET_EXPR] || tb[NFTA_DYNSET_EXPRESSIONS]) &&
242 !(set->flags & NFT_SET_EVAL))
245 if (tb[NFTA_DYNSET_EXPR]) {
246 struct nft_expr *dynset_expr;
248 dynset_expr = nft_dynset_expr_alloc(ctx, set,
249 tb[NFTA_DYNSET_EXPR], 0);
250 if (IS_ERR(dynset_expr))
251 return PTR_ERR(dynset_expr);
254 priv->expr_array[0] = dynset_expr;
256 if (set->num_exprs > 1 ||
257 (set->num_exprs == 1 &&
258 dynset_expr->ops != set->exprs[0]->ops)) {
262 } else if (tb[NFTA_DYNSET_EXPRESSIONS]) {
263 struct nft_expr *dynset_expr;
271 nla_for_each_nested(tmp, tb[NFTA_DYNSET_EXPRESSIONS], left) {
272 if (i == NFT_SET_EXPR_MAX) {
276 if (nla_type(tmp) != NFTA_LIST_ELEM) {
280 dynset_expr = nft_dynset_expr_alloc(ctx, set, tmp, i);
281 if (IS_ERR(dynset_expr)) {
282 err = PTR_ERR(dynset_expr);
285 priv->expr_array[i] = dynset_expr;
288 if (set->num_exprs &&
289 dynset_expr->ops != set->exprs[i]->ops) {
295 if (set->num_exprs && set->num_exprs != i) {
299 } else if (set->num_exprs > 0) {
300 err = nft_set_elem_expr_clone(ctx, set, priv->expr_array);
304 priv->num_exprs = set->num_exprs;
307 nft_set_ext_prepare(&priv->tmpl);
308 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
309 if (set->flags & NFT_SET_MAP)
310 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
313 nft_dynset_ext_add_expr(priv);
315 if (set->flags & NFT_SET_TIMEOUT) {
316 if (timeout || set->timeout) {
317 nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT);
318 nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
322 priv->timeout = timeout;
324 err = nf_tables_bind_set(ctx, set, &priv->binding);
335 for (i = 0; i < priv->num_exprs; i++)
336 nft_expr_destroy(ctx, priv->expr_array[i]);
340 static void nft_dynset_deactivate(const struct nft_ctx *ctx,
341 const struct nft_expr *expr,
342 enum nft_trans_phase phase)
344 struct nft_dynset *priv = nft_expr_priv(expr);
346 nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
349 static void nft_dynset_activate(const struct nft_ctx *ctx,
350 const struct nft_expr *expr)
352 struct nft_dynset *priv = nft_expr_priv(expr);
357 static void nft_dynset_destroy(const struct nft_ctx *ctx,
358 const struct nft_expr *expr)
360 struct nft_dynset *priv = nft_expr_priv(expr);
363 for (i = 0; i < priv->num_exprs; i++)
364 nft_expr_destroy(ctx, priv->expr_array[i]);
366 nf_tables_destroy_set(ctx, priv->set);
369 static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
371 const struct nft_dynset *priv = nft_expr_priv(expr);
372 u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
375 if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
376 goto nla_put_failure;
377 if (priv->set->flags & NFT_SET_MAP &&
378 nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
379 goto nla_put_failure;
380 if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
381 goto nla_put_failure;
382 if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
383 goto nla_put_failure;
384 if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
385 nf_jiffies64_to_msecs(priv->timeout),
387 goto nla_put_failure;
388 if (priv->set->num_exprs == 0) {
389 if (priv->num_exprs == 1) {
390 if (nft_expr_dump(skb, NFTA_DYNSET_EXPR,
391 priv->expr_array[0]))
392 goto nla_put_failure;
393 } else if (priv->num_exprs > 1) {
396 nest = nla_nest_start_noflag(skb, NFTA_DYNSET_EXPRESSIONS);
398 goto nla_put_failure;
400 for (i = 0; i < priv->num_exprs; i++) {
401 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
402 priv->expr_array[i]))
403 goto nla_put_failure;
405 nla_nest_end(skb, nest);
408 if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
409 goto nla_put_failure;
416 static const struct nft_expr_ops nft_dynset_ops = {
417 .type = &nft_dynset_type,
418 .size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
419 .eval = nft_dynset_eval,
420 .init = nft_dynset_init,
421 .destroy = nft_dynset_destroy,
422 .activate = nft_dynset_activate,
423 .deactivate = nft_dynset_deactivate,
424 .dump = nft_dynset_dump,
427 struct nft_expr_type nft_dynset_type __read_mostly = {
429 .ops = &nft_dynset_ops,
430 .policy = nft_dynset_policy,
431 .maxattr = NFTA_DYNSET_MAX,
432 .owner = THIS_MODULE,