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Linux/net/netfilter/nft_dynset.c

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  1 /*
  2  * Copyright (c) 2015 Patrick McHardy <kaber@trash.net>
  3  *
  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.
  7  *
  8  */
  9 
 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>
 18 
 19 struct nft_dynset {
 20         struct nft_set                  *set;
 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;
 25         bool                            invert;
 26         u64                             timeout;
 27         struct nft_expr                 *expr;
 28         struct nft_set_binding          binding;
 29 };
 30 
 31 static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
 32                             struct nft_regs *regs)
 33 {
 34         const struct nft_dynset *priv = nft_expr_priv(expr);
 35         struct nft_set_ext *ext;
 36         u64 timeout;
 37         void *elem;
 38 
 39         if (!atomic_add_unless(&set->nelems, 1, set->size))
 40                 return NULL;
 41 
 42         timeout = priv->timeout ? : set->timeout;
 43         elem = nft_set_elem_init(set, &priv->tmpl,
 44                                  &regs->data[priv->sreg_key],
 45                                  &regs->data[priv->sreg_data],
 46                                  timeout, GFP_ATOMIC);
 47         if (elem == NULL)
 48                 goto err1;
 49 
 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)
 53                 goto err2;
 54 
 55         return elem;
 56 
 57 err2:
 58         nft_set_elem_destroy(set, elem, false);
 59 err1:
 60         if (set->size)
 61                 atomic_dec(&set->nelems);
 62         return NULL;
 63 }
 64 
 65 void nft_dynset_eval(const struct nft_expr *expr,
 66                      struct nft_regs *regs, const struct nft_pktinfo *pkt)
 67 {
 68         const struct nft_dynset *priv = nft_expr_priv(expr);
 69         struct nft_set *set = priv->set;
 70         const struct nft_set_ext *ext;
 71         const struct nft_expr *sexpr;
 72         u64 timeout;
 73 
 74         if (set->ops->update(set, &regs->data[priv->sreg_key], nft_dynset_new,
 75                              expr, regs, &ext)) {
 76                 sexpr = NULL;
 77                 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
 78                         sexpr = nft_set_ext_expr(ext);
 79 
 80                 if (priv->op == NFT_DYNSET_OP_UPDATE &&
 81                     nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
 82                         timeout = priv->timeout ? : set->timeout;
 83                         *nft_set_ext_expiration(ext) = get_jiffies_64() + timeout;
 84                 }
 85 
 86                 if (sexpr != NULL)
 87                         sexpr->ops->eval(sexpr, regs, pkt);
 88 
 89                 if (priv->invert)
 90                         regs->verdict.code = NFT_BREAK;
 91                 return;
 92         }
 93 
 94         if (!priv->invert)
 95                 regs->verdict.code = NFT_BREAK;
 96 }
 97 
 98 static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
 99         [NFTA_DYNSET_SET_NAME]  = { .type = NLA_STRING,
100                                     .len = NFT_SET_MAXNAMELEN - 1 },
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 },
108 };
109 
110 static int nft_dynset_init(const struct nft_ctx *ctx,
111                            const struct nft_expr *expr,
112                            const struct nlattr * const tb[])
113 {
114         struct nft_dynset *priv = nft_expr_priv(expr);
115         u8 genmask = nft_genmask_next(ctx->net);
116         struct nft_set *set;
117         u64 timeout;
118         int err;
119 
120         lockdep_assert_held(&ctx->net->nft.commit_mutex);
121 
122         if (tb[NFTA_DYNSET_SET_NAME] == NULL ||
123             tb[NFTA_DYNSET_OP] == NULL ||
124             tb[NFTA_DYNSET_SREG_KEY] == NULL)
125                 return -EINVAL;
126 
127         if (tb[NFTA_DYNSET_FLAGS]) {
128                 u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
129 
130                 if (flags & ~NFT_DYNSET_F_INV)
131                         return -EINVAL;
132                 if (flags & NFT_DYNSET_F_INV)
133                         priv->invert = true;
134         }
135 
136         set = nft_set_lookup_global(ctx->net, ctx->table,
137                                     tb[NFTA_DYNSET_SET_NAME],
138                                     tb[NFTA_DYNSET_SET_ID], genmask);
139         if (IS_ERR(set))
140                 return PTR_ERR(set);
141 
142         if (set->ops->update == NULL)
143                 return -EOPNOTSUPP;
144 
145         if (set->flags & NFT_SET_CONSTANT)
146                 return -EBUSY;
147 
148         priv->op = ntohl(nla_get_be32(tb[NFTA_DYNSET_OP]));
149         switch (priv->op) {
150         case NFT_DYNSET_OP_ADD:
151                 break;
152         case NFT_DYNSET_OP_UPDATE:
153                 if (!(set->flags & NFT_SET_TIMEOUT))
154                         return -EOPNOTSUPP;
155                 break;
156         default:
157                 return -EOPNOTSUPP;
158         }
159 
160         timeout = 0;
161         if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
162                 if (!(set->flags & NFT_SET_TIMEOUT))
163                         return -EINVAL;
164                 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
165                                                 tb[NFTA_DYNSET_TIMEOUT])));
166         }
167 
168         priv->sreg_key = nft_parse_register(tb[NFTA_DYNSET_SREG_KEY]);
169         err = nft_validate_register_load(priv->sreg_key, set->klen);
170         if (err < 0)
171                 return err;
172 
173         if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
174                 if (!(set->flags & NFT_SET_MAP))
175                         return -EINVAL;
176                 if (set->dtype == NFT_DATA_VERDICT)
177                         return -EOPNOTSUPP;
178 
179                 priv->sreg_data = nft_parse_register(tb[NFTA_DYNSET_SREG_DATA]);
180                 err = nft_validate_register_load(priv->sreg_data, set->dlen);
181                 if (err < 0)
182                         return err;
183         } else if (set->flags & NFT_SET_MAP)
184                 return -EINVAL;
185 
186         if (tb[NFTA_DYNSET_EXPR] != NULL) {
187                 if (!(set->flags & NFT_SET_EVAL))
188                         return -EINVAL;
189 
190                 priv->expr = nft_expr_init(ctx, tb[NFTA_DYNSET_EXPR]);
191                 if (IS_ERR(priv->expr))
192                         return PTR_ERR(priv->expr);
193 
194                 err = -EOPNOTSUPP;
195                 if (!(priv->expr->ops->type->flags & NFT_EXPR_STATEFUL))
196                         goto err1;
197 
198                 if (priv->expr->ops->type->flags & NFT_EXPR_GC) {
199                         if (set->flags & NFT_SET_TIMEOUT)
200                                 goto err1;
201                         if (!set->ops->gc_init)
202                                 goto err1;
203                         set->ops->gc_init(set);
204                 }
205         }
206 
207         nft_set_ext_prepare(&priv->tmpl);
208         nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_KEY, set->klen);
209         if (set->flags & NFT_SET_MAP)
210                 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_DATA, set->dlen);
211         if (priv->expr != NULL)
212                 nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPR,
213                                        priv->expr->ops->size);
214         if (set->flags & NFT_SET_TIMEOUT) {
215                 if (timeout || set->timeout)
216                         nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
217         }
218 
219         priv->timeout = timeout;
220 
221         err = nf_tables_bind_set(ctx, set, &priv->binding);
222         if (err < 0)
223                 goto err1;
224 
225         if (set->size == 0)
226                 set->size = 0xffff;
227 
228         priv->set = set;
229         return 0;
230 
231 err1:
232         if (priv->expr != NULL)
233                 nft_expr_destroy(ctx, priv->expr);
234         return err;
235 }
236 
237 static void nft_dynset_deactivate(const struct nft_ctx *ctx,
238                                   const struct nft_expr *expr,
239                                   enum nft_trans_phase phase)
240 {
241         struct nft_dynset *priv = nft_expr_priv(expr);
242 
243         nf_tables_deactivate_set(ctx, priv->set, &priv->binding, phase);
244 }
245 
246 static void nft_dynset_activate(const struct nft_ctx *ctx,
247                                 const struct nft_expr *expr)
248 {
249         struct nft_dynset *priv = nft_expr_priv(expr);
250 
251         priv->set->use++;
252 }
253 
254 static void nft_dynset_destroy(const struct nft_ctx *ctx,
255                                const struct nft_expr *expr)
256 {
257         struct nft_dynset *priv = nft_expr_priv(expr);
258 
259         if (priv->expr != NULL)
260                 nft_expr_destroy(ctx, priv->expr);
261 
262         nf_tables_destroy_set(ctx, priv->set);
263 }
264 
265 static int nft_dynset_dump(struct sk_buff *skb, const struct nft_expr *expr)
266 {
267         const struct nft_dynset *priv = nft_expr_priv(expr);
268         u32 flags = priv->invert ? NFT_DYNSET_F_INV : 0;
269 
270         if (nft_dump_register(skb, NFTA_DYNSET_SREG_KEY, priv->sreg_key))
271                 goto nla_put_failure;
272         if (priv->set->flags & NFT_SET_MAP &&
273             nft_dump_register(skb, NFTA_DYNSET_SREG_DATA, priv->sreg_data))
274                 goto nla_put_failure;
275         if (nla_put_be32(skb, NFTA_DYNSET_OP, htonl(priv->op)))
276                 goto nla_put_failure;
277         if (nla_put_string(skb, NFTA_DYNSET_SET_NAME, priv->set->name))
278                 goto nla_put_failure;
279         if (nla_put_be64(skb, NFTA_DYNSET_TIMEOUT,
280                          cpu_to_be64(jiffies_to_msecs(priv->timeout)),
281                          NFTA_DYNSET_PAD))
282                 goto nla_put_failure;
283         if (priv->expr && nft_expr_dump(skb, NFTA_DYNSET_EXPR, priv->expr))
284                 goto nla_put_failure;
285         if (nla_put_be32(skb, NFTA_DYNSET_FLAGS, htonl(flags)))
286                 goto nla_put_failure;
287         return 0;
288 
289 nla_put_failure:
290         return -1;
291 }
292 
293 static const struct nft_expr_ops nft_dynset_ops = {
294         .type           = &nft_dynset_type,
295         .size           = NFT_EXPR_SIZE(sizeof(struct nft_dynset)),
296         .eval           = nft_dynset_eval,
297         .init           = nft_dynset_init,
298         .destroy        = nft_dynset_destroy,
299         .activate       = nft_dynset_activate,
300         .deactivate     = nft_dynset_deactivate,
301         .dump           = nft_dynset_dump,
302 };
303 
304 struct nft_expr_type nft_dynset_type __read_mostly = {
305         .name           = "dynset",
306         .ops            = &nft_dynset_ops,
307         .policy         = nft_dynset_policy,
308         .maxattr        = NFTA_DYNSET_MAX,
309         .owner          = THIS_MODULE,
310 };
311 

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