2 * Copyright (c) 2015 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/netlink.h>
14 #include <linux/netfilter.h>
15 #include <linux/netfilter/nf_tables.h>
16 #include <net/netfilter/nf_tables.h>
17 #include <net/netfilter/nf_tables_core.h>
21 struct nft_set_ext_tmpl tmpl;
22 enum nft_dynset_ops op:8;
23 enum nft_registers sreg_key:8;
24 enum nft_registers sreg_data:8;
27 struct nft_expr *expr;
28 struct nft_set_binding binding;
31 static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
32 struct nft_regs *regs)
34 const struct nft_dynset *priv = nft_expr_priv(expr);
35 struct nft_set_ext *ext;
39 if (set->size && !atomic_add_unless(&set->nelems, 1, set->size))
42 timeout = priv->timeout ? : set->timeout;
43 elem = nft_set_elem_init(set, &priv->tmpl,
44 ®s->data[priv->sreg_key],
45 ®s->data[priv->sreg_data],
50 ext = nft_set_elem_ext(set, elem);
51 if (priv->expr != NULL &&
52 nft_expr_clone(nft_set_ext_expr(ext), priv->expr) < 0)
58 nft_set_elem_destroy(set, elem, false);
61 atomic_dec(&set->nelems);
65 static void nft_dynset_eval(const struct nft_expr *expr,
66 struct nft_regs *regs,
67 const struct nft_pktinfo *pkt)
69 const struct nft_dynset *priv = nft_expr_priv(expr);
70 struct nft_set *set = priv->set;
71 const struct nft_set_ext *ext;
72 const struct nft_expr *sexpr;
75 if (set->ops->update(set, ®s->data[priv->sreg_key], nft_dynset_new,
78 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
79 sexpr = nft_set_ext_expr(ext);
81 if (priv->op == NFT_DYNSET_OP_UPDATE &&
82 nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
83 timeout = priv->timeout ? : set->timeout;
84 *nft_set_ext_expiration(ext) = jiffies + timeout;
88 sexpr->ops->eval(sexpr, regs, pkt);
91 regs->verdict.code = NFT_BREAK;
96 regs->verdict.code = NFT_BREAK;
99 static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
100 [NFTA_DYNSET_SET_NAME] = { .type = NLA_STRING },
101 [NFTA_DYNSET_SET_ID] = { .type = NLA_U32 },
102 [NFTA_DYNSET_OP] = { .type = NLA_U32 },
103 [NFTA_DYNSET_SREG_KEY] = { .type = NLA_U32 },
104 [NFTA_DYNSET_SREG_DATA] = { .type = NLA_U32 },
105 [NFTA_DYNSET_TIMEOUT] = { .type = NLA_U64 },
106 [NFTA_DYNSET_EXPR] = { .type = NLA_NESTED },
107 [NFTA_DYNSET_FLAGS] = { .type = NLA_U32 },
110 static int nft_dynset_init(const struct nft_ctx *ctx,
111 const struct nft_expr *expr,
112 const struct nlattr * const tb[])
114 struct nft_dynset *priv = nft_expr_priv(expr);
115 u8 genmask = nft_genmask_next(ctx->net);
120 if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
121 tb[NFTA_DYNSET_OP] == NULL ||
122 tb[NFTA_DYNSET_SREG_KEY] == NULL)
125 if (tb[NFTA_DYNSET_FLAGS]) {
126 u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
128 if (flags & ~NFT_DYNSET_F_INV)
130 if (flags & NFT_DYNSET_F_INV)
134 set = nf_tables_set_lookup(ctx->table, tb[NFTA_DYNSET_SET_NAME],
137 if (tb[NFTA_DYNSET_SET_ID])
138 set = nf_tables_set_lookup_byid(ctx->net,
139 tb[NFTA_DYNSET_SET_ID],
145 if (set->ops->update == NULL)
148 if (set->flags & NFT_SET_CONSTANT)
151 priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
153 case NFT_DYNSET_OP_ADD:
155 case NFT_DYNSET_OP_UPDATE:
156 if (!(set->flags & NFT_SET_TIMEOUT))
164 if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
165 if (!(set->flags & NFT_SET_TIMEOUT))
167 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
168 tb[NFTA_DYNSET_TIMEOUT])));
171 priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]);
172 err = nft_validate_register_load(priv->sreg_key, set->klen);;
176 if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
177 if (!(set->flags & NFT_SET_MAP))
179 if (set->dtype == NFT_DATA_VERDICT)
182 priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]);
183 err = nft_validate_register_load(priv->sreg_data, set->dlen);
186 } else if (set->flags & NFT_SET_MAP)
189 if (tb[NFTA_DYNSET_EXPR] != NULL) {
190 if (!(set->flags & NFT_SET_EVAL))
192 if (!(set->flags & NFT_SET_ANONYMOUS))
195 priv->expr = nft_expr_init(ctx, tb[NFTA_DYNSET_EXPR]);
196 if (IS_ERR(priv->expr))
197 return PTR_ERR(priv->expr);
199 } else if (set->flags & NFT_SET_EVAL)
202 nft_set_ext_prepare(&priv->tmpl);
203 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
204 if (set->flags & NFT_SET_MAP)
205 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
206 if (priv->expr != NULL)
207 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPR,
208 priv->expr->ops->size);
209 if (set->flags & NFT_SET_TIMEOUT) {
210 if (timeout || set->timeout) {
211 nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT);
212 nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
216 priv->timeout = timeout;
218 err = nf_tables_bind_set(ctx, set, &priv->binding);
226 if (priv->expr != NULL)
227 nft_expr_destroy(ctx, priv->expr);
231 static void nft_dynset_destroy(const struct nft_ctx *ctx,
232 const struct nft_expr *expr)
234 struct nft_dynset *priv = nft_expr_priv(expr);
236 nf_tables_unbind_set(ctx, priv->set, &priv->binding);
237 if (priv->expr != NULL)
238 nft_expr_destroy(ctx, priv->expr);
241 static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
243 const struct nft_dynset *priv = nft_expr_priv(expr);
244 u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
246 if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
247 goto nla_put_failure;
248 if (priv->set->flags & NFT_SET_MAP &&
249 nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
250 goto nla_put_failure;
251 if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
252 goto nla_put_failure;
253 if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
254 goto nla_put_failure;
255 if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
256 cpu_to_be64(jiffies_to_msecs(priv->timeout)),
258 goto nla_put_failure;
259 if (priv->expr && nft_expr_dump(skb, NFTA_DYNSET_EXPR, priv->expr))
260 goto nla_put_failure;
261 if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
262 goto nla_put_failure;
269 static struct nft_expr_type nft_dynset_type;
270 static const struct nft_expr_ops nft_dynset_ops = {
271 .type = &nft_dynset_type,
272 .size = NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
273 .eval = nft_dynset_eval,
274 .init = nft_dynset_init,
275 .destroy = nft_dynset_destroy,
276 .dump = nft_dynset_dump,
279 static struct nft_expr_type nft_dynset_type __read_mostly = {
281 .ops = &nft_dynset_ops,
282 .policy = nft_dynset_policy,
283 .maxattr = NFTA_DYNSET_MAX,
284 .owner = THIS_MODULE,
287 int __init nft_dynset_module_init(void)
289 return nft_register_expr(&nft_dynset_type);
292 void nft_dynset_module_exit(void)
294 nft_unregister_expr(&nft_dynset_type);