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96518518 PM |
1 | #ifndef _NET_NF_TABLES_H |
2 | #define _NET_NF_TABLES_H | |
3 | ||
4 | #include <linux/list.h> | |
5 | #include <linux/netfilter.h> | |
0ca743a5 | 6 | #include <linux/netfilter/x_tables.h> |
96518518 PM |
7 | #include <linux/netfilter/nf_tables.h> |
8 | #include <net/netlink.h> | |
9 | ||
20a69341 PM |
10 | #define NFT_JUMP_STACK_SIZE 16 |
11 | ||
96518518 PM |
12 | struct nft_pktinfo { |
13 | struct sk_buff *skb; | |
14 | const struct net_device *in; | |
15 | const struct net_device *out; | |
16 | u8 hooknum; | |
17 | u8 nhoff; | |
18 | u8 thoff; | |
0ca743a5 PNA |
19 | /* for x_tables compatibility */ |
20 | struct xt_action_param xt; | |
96518518 PM |
21 | }; |
22 | ||
0ca743a5 PNA |
23 | static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, |
24 | const struct nf_hook_ops *ops, | |
25 | struct sk_buff *skb, | |
26 | const struct net_device *in, | |
27 | const struct net_device *out) | |
28 | { | |
29 | pkt->skb = skb; | |
30 | pkt->in = pkt->xt.in = in; | |
31 | pkt->out = pkt->xt.out = out; | |
32 | pkt->hooknum = pkt->xt.hooknum = ops->hooknum; | |
33 | pkt->xt.family = ops->pf; | |
34 | } | |
35 | ||
96518518 PM |
36 | struct nft_data { |
37 | union { | |
38 | u32 data[4]; | |
39 | struct { | |
40 | u32 verdict; | |
41 | struct nft_chain *chain; | |
42 | }; | |
43 | }; | |
44 | } __attribute__((aligned(__alignof__(u64)))); | |
45 | ||
46 | static inline int nft_data_cmp(const struct nft_data *d1, | |
47 | const struct nft_data *d2, | |
48 | unsigned int len) | |
49 | { | |
50 | return memcmp(d1->data, d2->data, len); | |
51 | } | |
52 | ||
53 | static inline void nft_data_copy(struct nft_data *dst, | |
54 | const struct nft_data *src) | |
55 | { | |
56 | BUILD_BUG_ON(__alignof__(*dst) != __alignof__(u64)); | |
57 | *(u64 *)&dst->data[0] = *(u64 *)&src->data[0]; | |
58 | *(u64 *)&dst->data[2] = *(u64 *)&src->data[2]; | |
59 | } | |
60 | ||
61 | static inline void nft_data_debug(const struct nft_data *data) | |
62 | { | |
63 | pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n", | |
64 | data->data[0], data->data[1], | |
65 | data->data[2], data->data[3]); | |
66 | } | |
67 | ||
68 | /** | |
20a69341 | 69 | * struct nft_ctx - nf_tables rule/set context |
96518518 | 70 | * |
20a69341 PM |
71 | * @skb: netlink skb |
72 | * @nlh: netlink message header | |
96518518 PM |
73 | * @afi: address family info |
74 | * @table: the table the chain is contained in | |
75 | * @chain: the chain the rule is contained in | |
0ca743a5 | 76 | * @nla: netlink attributes |
96518518 PM |
77 | */ |
78 | struct nft_ctx { | |
20a69341 PM |
79 | const struct sk_buff *skb; |
80 | const struct nlmsghdr *nlh; | |
96518518 PM |
81 | const struct nft_af_info *afi; |
82 | const struct nft_table *table; | |
83 | const struct nft_chain *chain; | |
0ca743a5 | 84 | const struct nlattr * const *nla; |
96518518 PM |
85 | }; |
86 | ||
96518518 PM |
87 | struct nft_data_desc { |
88 | enum nft_data_types type; | |
89 | unsigned int len; | |
90 | }; | |
91 | ||
92 | extern int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, | |
93 | struct nft_data_desc *desc, const struct nlattr *nla); | |
94 | extern void nft_data_uninit(const struct nft_data *data, | |
95 | enum nft_data_types type); | |
96 | extern int nft_data_dump(struct sk_buff *skb, int attr, | |
97 | const struct nft_data *data, | |
98 | enum nft_data_types type, unsigned int len); | |
99 | ||
100 | static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) | |
101 | { | |
102 | return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; | |
103 | } | |
104 | ||
20a69341 PM |
105 | static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) |
106 | { | |
107 | return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1; | |
108 | } | |
109 | ||
96518518 PM |
110 | extern int nft_validate_input_register(enum nft_registers reg); |
111 | extern int nft_validate_output_register(enum nft_registers reg); | |
112 | extern int nft_validate_data_load(const struct nft_ctx *ctx, | |
113 | enum nft_registers reg, | |
114 | const struct nft_data *data, | |
115 | enum nft_data_types type); | |
116 | ||
20a69341 PM |
117 | /** |
118 | * struct nft_set_elem - generic representation of set elements | |
119 | * | |
120 | * @cookie: implementation specific element cookie | |
121 | * @key: element key | |
122 | * @data: element data (maps only) | |
123 | * @flags: element flags (end of interval) | |
124 | * | |
125 | * The cookie can be used to store a handle to the element for subsequent | |
126 | * removal. | |
127 | */ | |
128 | struct nft_set_elem { | |
129 | void *cookie; | |
130 | struct nft_data key; | |
131 | struct nft_data data; | |
132 | u32 flags; | |
133 | }; | |
134 | ||
135 | struct nft_set; | |
136 | struct nft_set_iter { | |
137 | unsigned int count; | |
138 | unsigned int skip; | |
139 | int err; | |
140 | int (*fn)(const struct nft_ctx *ctx, | |
141 | const struct nft_set *set, | |
142 | const struct nft_set_iter *iter, | |
143 | const struct nft_set_elem *elem); | |
144 | }; | |
145 | ||
146 | /** | |
147 | * struct nft_set_ops - nf_tables set operations | |
148 | * | |
149 | * @lookup: look up an element within the set | |
150 | * @insert: insert new element into set | |
151 | * @remove: remove element from set | |
152 | * @walk: iterate over all set elemeennts | |
153 | * @privsize: function to return size of set private data | |
154 | * @init: initialize private data of new set instance | |
155 | * @destroy: destroy private data of set instance | |
156 | * @list: nf_tables_set_ops list node | |
157 | * @owner: module reference | |
158 | * @features: features supported by the implementation | |
159 | */ | |
160 | struct nft_set_ops { | |
161 | bool (*lookup)(const struct nft_set *set, | |
162 | const struct nft_data *key, | |
163 | struct nft_data *data); | |
164 | int (*get)(const struct nft_set *set, | |
165 | struct nft_set_elem *elem); | |
166 | int (*insert)(const struct nft_set *set, | |
167 | const struct nft_set_elem *elem); | |
168 | void (*remove)(const struct nft_set *set, | |
169 | const struct nft_set_elem *elem); | |
170 | void (*walk)(const struct nft_ctx *ctx, | |
171 | const struct nft_set *set, | |
172 | struct nft_set_iter *iter); | |
173 | ||
174 | unsigned int (*privsize)(const struct nlattr * const nla[]); | |
175 | int (*init)(const struct nft_set *set, | |
176 | const struct nlattr * const nla[]); | |
177 | void (*destroy)(const struct nft_set *set); | |
178 | ||
179 | struct list_head list; | |
180 | struct module *owner; | |
181 | u32 features; | |
182 | }; | |
183 | ||
184 | extern int nft_register_set(struct nft_set_ops *ops); | |
185 | extern void nft_unregister_set(struct nft_set_ops *ops); | |
186 | ||
187 | /** | |
188 | * struct nft_set - nf_tables set instance | |
189 | * | |
190 | * @list: table set list node | |
191 | * @bindings: list of set bindings | |
192 | * @name: name of the set | |
193 | * @ktype: key type (numeric type defined by userspace, not used in the kernel) | |
194 | * @dtype: data type (verdict or numeric type defined by userspace) | |
195 | * @ops: set ops | |
196 | * @flags: set flags | |
197 | * @klen: key length | |
198 | * @dlen: data length | |
199 | * @data: private set data | |
200 | */ | |
201 | struct nft_set { | |
202 | struct list_head list; | |
203 | struct list_head bindings; | |
204 | char name[IFNAMSIZ]; | |
205 | u32 ktype; | |
206 | u32 dtype; | |
207 | /* runtime data below here */ | |
208 | const struct nft_set_ops *ops ____cacheline_aligned; | |
209 | u16 flags; | |
210 | u8 klen; | |
211 | u8 dlen; | |
212 | unsigned char data[] | |
213 | __attribute__((aligned(__alignof__(u64)))); | |
214 | }; | |
215 | ||
216 | static inline void *nft_set_priv(const struct nft_set *set) | |
217 | { | |
218 | return (void *)set->data; | |
219 | } | |
220 | ||
221 | extern struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
222 | const struct nlattr *nla); | |
223 | ||
224 | /** | |
225 | * struct nft_set_binding - nf_tables set binding | |
226 | * | |
227 | * @list: set bindings list node | |
228 | * @chain: chain containing the rule bound to the set | |
229 | * | |
230 | * A set binding contains all information necessary for validation | |
231 | * of new elements added to a bound set. | |
232 | */ | |
233 | struct nft_set_binding { | |
234 | struct list_head list; | |
235 | const struct nft_chain *chain; | |
236 | }; | |
237 | ||
238 | extern int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
239 | struct nft_set_binding *binding); | |
240 | extern void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
241 | struct nft_set_binding *binding); | |
242 | ||
ef1f7df9 | 243 | |
96518518 | 244 | /** |
ef1f7df9 | 245 | * struct nft_expr_type - nf_tables expression type |
96518518 | 246 | * |
ef1f7df9 PM |
247 | * @select_ops: function to select nft_expr_ops |
248 | * @ops: default ops, used when no select_ops functions is present | |
96518518 PM |
249 | * @list: used internally |
250 | * @name: Identifier | |
251 | * @owner: module reference | |
252 | * @policy: netlink attribute policy | |
253 | * @maxattr: highest netlink attribute number | |
ef1f7df9 PM |
254 | */ |
255 | struct nft_expr_type { | |
0ca743a5 PNA |
256 | const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, |
257 | const struct nlattr * const tb[]); | |
ef1f7df9 PM |
258 | const struct nft_expr_ops *ops; |
259 | struct list_head list; | |
260 | const char *name; | |
261 | struct module *owner; | |
262 | const struct nla_policy *policy; | |
263 | unsigned int maxattr; | |
264 | }; | |
265 | ||
266 | /** | |
267 | * struct nft_expr_ops - nf_tables expression operations | |
268 | * | |
269 | * @eval: Expression evaluation function | |
96518518 | 270 | * @size: full expression size, including private data size |
ef1f7df9 PM |
271 | * @init: initialization function |
272 | * @destroy: destruction function | |
273 | * @dump: function to dump parameters | |
274 | * @type: expression type | |
0ca743a5 PNA |
275 | * @validate: validate expression, called during loop detection |
276 | * @data: extra data to attach to this expression operation | |
96518518 PM |
277 | */ |
278 | struct nft_expr; | |
279 | struct nft_expr_ops { | |
280 | void (*eval)(const struct nft_expr *expr, | |
281 | struct nft_data data[NFT_REG_MAX + 1], | |
282 | const struct nft_pktinfo *pkt); | |
ef1f7df9 PM |
283 | unsigned int size; |
284 | ||
96518518 PM |
285 | int (*init)(const struct nft_ctx *ctx, |
286 | const struct nft_expr *expr, | |
287 | const struct nlattr * const tb[]); | |
288 | void (*destroy)(const struct nft_expr *expr); | |
289 | int (*dump)(struct sk_buff *skb, | |
290 | const struct nft_expr *expr); | |
0ca743a5 PNA |
291 | int (*validate)(const struct nft_ctx *ctx, |
292 | const struct nft_expr *expr, | |
293 | const struct nft_data **data); | |
ef1f7df9 | 294 | const struct nft_expr_type *type; |
0ca743a5 | 295 | void *data; |
96518518 PM |
296 | }; |
297 | ||
ef1f7df9 | 298 | #define NFT_EXPR_MAXATTR 16 |
96518518 PM |
299 | #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ |
300 | ALIGN(size, __alignof__(struct nft_expr))) | |
301 | ||
302 | /** | |
303 | * struct nft_expr - nf_tables expression | |
304 | * | |
305 | * @ops: expression ops | |
306 | * @data: expression private data | |
307 | */ | |
308 | struct nft_expr { | |
309 | const struct nft_expr_ops *ops; | |
310 | unsigned char data[]; | |
311 | }; | |
312 | ||
313 | static inline void *nft_expr_priv(const struct nft_expr *expr) | |
314 | { | |
315 | return (void *)expr->data; | |
316 | } | |
317 | ||
318 | /** | |
319 | * struct nft_rule - nf_tables rule | |
320 | * | |
321 | * @list: used internally | |
322 | * @rcu_head: used internally for rcu | |
323 | * @handle: rule handle | |
324 | * @dlen: length of expression data | |
325 | * @data: expression data | |
326 | */ | |
327 | struct nft_rule { | |
328 | struct list_head list; | |
329 | struct rcu_head rcu_head; | |
330 | u64 handle:48, | |
331 | dlen:16; | |
332 | unsigned char data[] | |
333 | __attribute__((aligned(__alignof__(struct nft_expr)))); | |
334 | }; | |
335 | ||
336 | static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) | |
337 | { | |
338 | return (struct nft_expr *)&rule->data[0]; | |
339 | } | |
340 | ||
341 | static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) | |
342 | { | |
343 | return ((void *)expr) + expr->ops->size; | |
344 | } | |
345 | ||
346 | static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) | |
347 | { | |
348 | return (struct nft_expr *)&rule->data[rule->dlen]; | |
349 | } | |
350 | ||
351 | /* | |
352 | * The last pointer isn't really necessary, but the compiler isn't able to | |
353 | * determine that the result of nft_expr_last() is always the same since it | |
354 | * can't assume that the dlen value wasn't changed within calls in the loop. | |
355 | */ | |
356 | #define nft_rule_for_each_expr(expr, last, rule) \ | |
357 | for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ | |
358 | (expr) != (last); \ | |
359 | (expr) = nft_expr_next(expr)) | |
360 | ||
361 | enum nft_chain_flags { | |
362 | NFT_BASE_CHAIN = 0x1, | |
96518518 PM |
363 | }; |
364 | ||
365 | /** | |
366 | * struct nft_chain - nf_tables chain | |
367 | * | |
368 | * @rules: list of rules in the chain | |
369 | * @list: used internally | |
370 | * @rcu_head: used internally | |
371 | * @handle: chain handle | |
372 | * @flags: bitmask of enum nft_chain_flags | |
373 | * @use: number of jump references to this chain | |
374 | * @level: length of longest path to this chain | |
375 | * @name: name of the chain | |
376 | */ | |
377 | struct nft_chain { | |
378 | struct list_head rules; | |
379 | struct list_head list; | |
380 | struct rcu_head rcu_head; | |
381 | u64 handle; | |
382 | u8 flags; | |
383 | u16 use; | |
384 | u16 level; | |
385 | char name[NFT_CHAIN_MAXNAMELEN]; | |
386 | }; | |
387 | ||
9370761c PNA |
388 | enum nft_chain_type { |
389 | NFT_CHAIN_T_DEFAULT = 0, | |
390 | NFT_CHAIN_T_ROUTE, | |
391 | NFT_CHAIN_T_NAT, | |
392 | NFT_CHAIN_T_MAX | |
393 | }; | |
394 | ||
0ca743a5 PNA |
395 | struct nft_stats { |
396 | u64 bytes; | |
397 | u64 pkts; | |
398 | }; | |
399 | ||
96518518 PM |
400 | /** |
401 | * struct nft_base_chain - nf_tables base chain | |
402 | * | |
403 | * @ops: netfilter hook ops | |
9370761c | 404 | * @type: chain type |
0ca743a5 PNA |
405 | * @policy: default policy |
406 | * @stats: per-cpu chain stats | |
96518518 PM |
407 | * @chain: the chain |
408 | */ | |
409 | struct nft_base_chain { | |
410 | struct nf_hook_ops ops; | |
9370761c | 411 | enum nft_chain_type type; |
0ca743a5 PNA |
412 | u8 policy; |
413 | struct nft_stats __percpu *stats; | |
96518518 PM |
414 | struct nft_chain chain; |
415 | }; | |
416 | ||
417 | static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) | |
418 | { | |
419 | return container_of(chain, struct nft_base_chain, chain); | |
420 | } | |
421 | ||
0ca743a5 PNA |
422 | extern unsigned int nft_do_chain_pktinfo(struct nft_pktinfo *pkt, |
423 | const struct nf_hook_ops *ops); | |
96518518 | 424 | |
96518518 PM |
425 | /** |
426 | * struct nft_table - nf_tables table | |
427 | * | |
428 | * @list: used internally | |
429 | * @chains: chains in the table | |
430 | * @sets: sets in the table | |
431 | * @hgenerator: handle generator state | |
432 | * @use: number of chain references to this table | |
433 | * @flags: table flag (see enum nft_table_flags) | |
434 | * @name: name of the table | |
435 | */ | |
436 | struct nft_table { | |
437 | struct list_head list; | |
438 | struct list_head chains; | |
439 | struct list_head sets; | |
440 | u64 hgenerator; | |
441 | u32 use; | |
442 | u16 flags; | |
443 | char name[]; | |
444 | }; | |
445 | ||
446 | /** | |
447 | * struct nft_af_info - nf_tables address family info | |
448 | * | |
449 | * @list: used internally | |
450 | * @family: address family | |
451 | * @nhooks: number of hooks in this family | |
452 | * @owner: module owner | |
453 | * @tables: used internally | |
454 | * @hooks: hookfn overrides for packet validation | |
455 | */ | |
456 | struct nft_af_info { | |
457 | struct list_head list; | |
458 | int family; | |
459 | unsigned int nhooks; | |
460 | struct module *owner; | |
461 | struct list_head tables; | |
462 | nf_hookfn *hooks[NF_MAX_HOOKS]; | |
463 | }; | |
464 | ||
465 | extern int nft_register_afinfo(struct nft_af_info *); | |
466 | extern void nft_unregister_afinfo(struct nft_af_info *); | |
467 | ||
9370761c PNA |
468 | struct nf_chain_type { |
469 | unsigned int hook_mask; | |
470 | const char *name; | |
471 | enum nft_chain_type type; | |
472 | nf_hookfn *fn[NF_MAX_HOOKS]; | |
473 | struct module *me; | |
474 | int family; | |
475 | }; | |
476 | ||
477 | extern int nft_register_chain_type(struct nf_chain_type *); | |
478 | extern void nft_unregister_chain_type(struct nf_chain_type *); | |
96518518 | 479 | |
ef1f7df9 PM |
480 | extern int nft_register_expr(struct nft_expr_type *); |
481 | extern void nft_unregister_expr(struct nft_expr_type *); | |
96518518 PM |
482 | |
483 | #define MODULE_ALIAS_NFT_FAMILY(family) \ | |
484 | MODULE_ALIAS("nft-afinfo-" __stringify(family)) | |
485 | ||
9370761c PNA |
486 | #define MODULE_ALIAS_NFT_CHAIN(family, name) \ |
487 | MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) | |
96518518 PM |
488 | |
489 | #define MODULE_ALIAS_NFT_EXPR(name) \ | |
490 | MODULE_ALIAS("nft-expr-" name) | |
491 | ||
20a69341 PM |
492 | #define MODULE_ALIAS_NFT_SET() \ |
493 | MODULE_ALIAS("nft-set") | |
494 | ||
96518518 | 495 | #endif /* _NET_NF_TABLES_H */ |