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;
24 struct nft_expr *expr_array[NFT_SET_EXPR_MAX];
25 struct nft_set_binding binding;
28 static int nft_dynset_expr_setup(const struct nft_dynset *priv,
29 const struct nft_set_ext *ext)
31 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
32 struct nft_expr *expr;
35 for (i = 0; i < priv->num_exprs; i++) {
36 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
37 if (nft_expr_clone(expr, priv->expr_array[i]) < 0)
40 elem_expr->size += priv->expr_array[i]->ops->size;
46 static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
47 struct nft_regs *regs)
49 const struct nft_dynset *priv = nft_expr_priv(expr);
50 struct nft_set_ext *ext;
54 if (!atomic_add_unless(&set->nelems, 1, set->size))
57 timeout = priv->timeout ? : set->timeout;
58 elem = nft_set_elem_init(set, &priv->tmpl,
59 ®s->data[priv->sreg_key], NULL,
60 ®s->data[priv->sreg_data],
61 timeout, 0, GFP_ATOMIC);
65 ext = nft_set_elem_ext(set, elem);
66 if (priv->num_exprs && nft_dynset_expr_setup(priv, ext) < 0)
72 nft_set_elem_destroy(set, elem, false);
75 atomic_dec(&set->nelems);
79 void nft_dynset_eval(const struct nft_expr *expr,
80 struct nft_regs *regs, const struct nft_pktinfo *pkt)
82 const struct nft_dynset *priv = nft_expr_priv(expr);
83 struct nft_set *set = priv->set;
84 const struct nft_set_ext *ext;
87 if (priv->op == NFT_DYNSET_OP_DELETE) {
88 set->ops->delete(set, ®s->data[priv->sreg_key]);
92 if (set->ops->update(set, ®s->data[priv->sreg_key], nft_dynset_new,
94 if (priv->op == NFT_DYNSET_OP_UPDATE &&
95 nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
96 timeout = priv->timeout ? : set->timeout;
97 *nft_set_ext_expiration(ext) = get_jiffies_64() + timeout;
100 nft_set_elem_update_expr(ext, regs, pkt);
103 regs->verdict.code = NFT_BREAK;
108 regs->verdict.code = NFT_BREAK;
111 static void nft_dynset_ext_add_expr(struct nft_dynset *priv)
116 for (i = 0; i < priv->num_exprs; i++)
117 size += priv->expr_array[i]->ops->size;
119 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPRESSIONS,
120 sizeof(struct nft_set_elem_expr) + size);
123 static struct nft_expr *
124 nft_dynset_expr_alloc(const struct nft_ctx *ctx, const struct nft_set *set,
125 const struct nlattr *attr, int pos)
127 struct nft_expr *expr;
130 expr = nft_set_elem_expr_alloc(ctx, set, attr);
134 if (set->exprs[pos] && set->exprs[pos]->ops != expr->ops) {
136 goto err_dynset_expr;
142 nft_expr_destroy(ctx, expr);
146 static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
147 [NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING,
148 .len = NFT_SET_MAXNAMELEN - 1 },
149 [NFTA_DYNSET_SET_ID] = { .type = NLA_U32 },
150 [NFTA_DYNSET_OP] = { .type = NLA_U32 },
151 [NFTA_DYNSET_SREG_KEY] = { .type = NLA_U32 },
152 [NFTA_DYNSET_SREG_DATA] = { .type = NLA_U32 },
153 [NFTA_DYNSET_TIMEOUT] = { .type = NLA_U64 },
154 [NFTA_DYNSET_EXPR] = { .type = NLA_NESTED },
155 [NFTA_DYNSET_FLAGS] = { .type = NLA_U32 },
158 static int nft_dynset_init(const struct nft_ctx *ctx,
159 const struct nft_expr *expr,
160 const struct nlattr * const tb[])
162 struct nft_dynset *priv = nft_expr_priv(expr);
163 u8 genmask = nft_genmask_next(ctx->net);
168 lockdep_assert_held(&ctx->net->nft.commit_mutex);
170 if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
171 tb[NFTA_DYNSET_OP] == NULL ||
172 tb[NFTA_DYNSET_SREG_KEY] == NULL)
175 if (tb[NFTA_DYNSET_FLAGS]) {
176 u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
178 if (flags & ~NFT_DYNSET_F_INV)
180 if (flags & NFT_DYNSET_F_INV)
184 set = nft_set_lookup_global(ctx->net, ctx->table,
185 tb[NFTA_DYNSET_SET_NAME],
186 tb[NFTA_DYNSET_SET_ID], genmask);
190 if (set->ops->update == NULL)
193 if (set->flags & NFT_SET_CONSTANT)
196 priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
198 case NFT_DYNSET_OP_ADD:
199 case NFT_DYNSET_OP_DELETE:
201 case NFT_DYNSET_OP_UPDATE:
202 if (!(set->flags & NFT_SET_TIMEOUT))
210 if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
211 if (!(set->flags & NFT_SET_TIMEOUT))
213 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
214 tb[NFTA_DYNSET_TIMEOUT])));
217 priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]);
218 err = nft_validate_register_load(priv->sreg_key, set->klen);
222 if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
223 if (!(set->flags & NFT_SET_MAP))
225 if (set->dtype == NFT_DATA_VERDICT)
228 priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]);
229 err = nft_validate_register_load(priv->sreg_data, set->dlen);
232 } else if (set->flags & NFT_SET_MAP)
235 if (tb[NFTA_DYNSET_EXPR]) {
236 struct nft_expr *dynset_expr;
238 if (!(set->flags & NFT_SET_EVAL))
241 dynset_expr = nft_dynset_expr_alloc(ctx, set,
242 tb[NFTA_DYNSET_EXPR], 0);
243 if (IS_ERR(dynset_expr))
244 return PTR_ERR(dynset_expr);
247 priv->expr_array[0] = dynset_expr;
249 if (set->num_exprs > 1 ||
250 (set->num_exprs == 1 &&
251 dynset_expr->ops != set->exprs[0]->ops)) {
257 nft_set_ext_prepare(&priv->tmpl);
258 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
259 if (set->flags & NFT_SET_MAP)
260 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
263 nft_dynset_ext_add_expr(priv);
265 if (set->flags & NFT_SET_TIMEOUT) {
266 if (timeout || set->timeout)
267 nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
270 priv->timeout = timeout;
272 err = nf_tables_bind_set(ctx, set, &priv->binding);
283 for (i = 0; i < priv->num_exprs; i++)
284 nft_expr_destroy(ctx, priv->expr_array[i]);
288 static void nft_dynset_deactivate(const struct nft_ctx *ctx,
289 const struct nft_expr *expr,
290 enum nft_trans_phase phase)
292 struct nft_dynset *priv = nft_expr_priv(expr);
294 nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
297 static void nft_dynset_activate(const struct nft_ctx *ctx,
298 const struct nft_expr *expr)
300 struct nft_dynset *priv = nft_expr_priv(expr);
305 static void nft_dynset_destroy(const struct nft_ctx *ctx,
306 const struct nft_expr *expr)
308 struct nft_dynset *priv = nft_expr_priv(expr);
311 for (i = 0; i < priv->num_exprs; i++)
312 nft_expr_destroy(ctx, priv->expr_array[i]);
314 nf_tables_destroy_set(ctx, priv->set);
317 static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
319 const struct nft_dynset *priv = nft_expr_priv(expr);
320 u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
322 if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
323 goto nla_put_failure;
324 if (priv->set->flags & NFT_SET_MAP &&
325 nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
326 goto nla_put_failure;
327 if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
328 goto nla_put_failure;
329 if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
330 goto nla_put_failure;
331 if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
332 cpu_to_be64(jiffies_to_msecs(priv->timeout)),
334 goto nla_put_failure;
335 if (priv->num_exprs == 1) {
336 if (nft_expr_dump(skb, NFTA_DYNSET_EXPR, priv->expr_array[0]))
337 goto nla_put_failure;
339 if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
340 goto nla_put_failure;
347 static const struct nft_expr_ops nft_dynset_ops = {
348 .type = &nft_dynset_type,
349 .size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
350 .eval = nft_dynset_eval,
351 .init = nft_dynset_init,
352 .destroy = nft_dynset_destroy,
353 .activate = nft_dynset_activate,
354 .deactivate = nft_dynset_deactivate,
355 .dump = nft_dynset_dump,
358 struct nft_expr_type nft_dynset_type __read_mostly = {
360 .ops = &nft_dynset_ops,
361 .policy = nft_dynset_policy,
362 .maxattr = NFTA_DYNSET_MAX,
363 .owner = THIS_MODULE,