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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
96518518 PM |
2 | #ifndef _NET_NF_TABLES_H |
3 | #define _NET_NF_TABLES_H | |
4 | ||
0b2d8a7b | 5 | #include <linux/module.h> |
96518518 PM |
6 | #include <linux/list.h> |
7 | #include <linux/netfilter.h> | |
67a8fc27 | 8 | #include <linux/netfilter/nfnetlink.h> |
0ca743a5 | 9 | #include <linux/netfilter/x_tables.h> |
96518518 | 10 | #include <linux/netfilter/nf_tables.h> |
ce355e20 | 11 | #include <linux/u64_stats_sync.h> |
3b49e2e9 | 12 | #include <net/netfilter/nf_flow_table.h> |
96518518 PM |
13 | #include <net/netlink.h> |
14 | ||
20a69341 PM |
15 | #define NFT_JUMP_STACK_SIZE 16 |
16 | ||
96518518 PM |
17 | struct nft_pktinfo { |
18 | struct sk_buff *skb; | |
beac5afa | 19 | bool tprot_set; |
4566bf27 | 20 | u8 tprot; |
0ca743a5 PNA |
21 | /* for x_tables compatibility */ |
22 | struct xt_action_param xt; | |
96518518 PM |
23 | }; |
24 | ||
0e5a1c7e PNA |
25 | static inline struct net *nft_net(const struct nft_pktinfo *pkt) |
26 | { | |
27 | return pkt->xt.state->net; | |
28 | } | |
29 | ||
30 | static inline unsigned int nft_hook(const struct nft_pktinfo *pkt) | |
31 | { | |
32 | return pkt->xt.state->hook; | |
33 | } | |
34 | ||
35 | static inline u8 nft_pf(const struct nft_pktinfo *pkt) | |
36 | { | |
37 | return pkt->xt.state->pf; | |
38 | } | |
39 | ||
40 | static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt) | |
41 | { | |
42 | return pkt->xt.state->in; | |
43 | } | |
44 | ||
45 | static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt) | |
46 | { | |
47 | return pkt->xt.state->out; | |
48 | } | |
49 | ||
0ca743a5 | 50 | static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, |
0ca743a5 | 51 | struct sk_buff *skb, |
073bfd56 | 52 | const struct nf_hook_state *state) |
0ca743a5 PNA |
53 | { |
54 | pkt->skb = skb; | |
613dbd95 | 55 | pkt->xt.state = state; |
0ca743a5 PNA |
56 | } |
57 | ||
7a4473a3 PNA |
58 | static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt, |
59 | struct sk_buff *skb) | |
beac5afa PNA |
60 | { |
61 | pkt->tprot_set = false; | |
62 | pkt->tprot = 0; | |
63 | pkt->xt.thoff = 0; | |
64 | pkt->xt.fragoff = 0; | |
65 | } | |
66 | ||
a55e22e9 PM |
67 | /** |
68 | * struct nft_verdict - nf_tables verdict | |
69 | * | |
70 | * @code: nf_tables/netfilter verdict code | |
71 | * @chain: destination chain for NFT_JUMP/NFT_GOTO | |
72 | */ | |
73 | struct nft_verdict { | |
74 | u32 code; | |
75 | struct nft_chain *chain; | |
76 | }; | |
77 | ||
96518518 PM |
78 | struct nft_data { |
79 | union { | |
1ca2e170 PM |
80 | u32 data[4]; |
81 | struct nft_verdict verdict; | |
96518518 PM |
82 | }; |
83 | } __attribute__((aligned(__alignof__(u64)))); | |
84 | ||
a55e22e9 PM |
85 | /** |
86 | * struct nft_regs - nf_tables register set | |
87 | * | |
88 | * @data: data registers | |
89 | * @verdict: verdict register | |
90 | * | |
91 | * The first four data registers alias to the verdict register. | |
92 | */ | |
93 | struct nft_regs { | |
94 | union { | |
49499c3e | 95 | u32 data[20]; |
a55e22e9 PM |
96 | struct nft_verdict verdict; |
97 | }; | |
98 | }; | |
99 | ||
10596608 LZ |
100 | /* Store/load an u16 or u8 integer to/from the u32 data register. |
101 | * | |
102 | * Note, when using concatenations, register allocation happens at 32-bit | |
103 | * level. So for store instruction, pad the rest part with zero to avoid | |
104 | * garbage values. | |
105 | */ | |
106 | ||
107 | static inline void nft_reg_store16(u32 *dreg, u16 val) | |
108 | { | |
109 | *dreg = 0; | |
110 | *(u16 *)dreg = val; | |
111 | } | |
112 | ||
113 | static inline void nft_reg_store8(u32 *dreg, u8 val) | |
114 | { | |
115 | *dreg = 0; | |
116 | *(u8 *)dreg = val; | |
117 | } | |
118 | ||
119 | static inline u16 nft_reg_load16(u32 *sreg) | |
120 | { | |
121 | return *(u16 *)sreg; | |
122 | } | |
123 | ||
124 | static inline u8 nft_reg_load8(u32 *sreg) | |
125 | { | |
126 | return *(u8 *)sreg; | |
127 | } | |
128 | ||
49499c3e PM |
129 | static inline void nft_data_copy(u32 *dst, const struct nft_data *src, |
130 | unsigned int len) | |
96518518 | 131 | { |
49499c3e | 132 | memcpy(dst, src, len); |
96518518 PM |
133 | } |
134 | ||
135 | static inline void nft_data_debug(const struct nft_data *data) | |
136 | { | |
137 | pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n", | |
138 | data->data[0], data->data[1], | |
139 | data->data[2], data->data[3]); | |
140 | } | |
141 | ||
142 | /** | |
20a69341 | 143 | * struct nft_ctx - nf_tables rule/set context |
96518518 | 144 | * |
99633ab2 | 145 | * @net: net namespace |
96518518 PM |
146 | * @table: the table the chain is contained in |
147 | * @chain: the chain the rule is contained in | |
0ca743a5 | 148 | * @nla: netlink attributes |
128ad332 PNA |
149 | * @portid: netlink portID of the original message |
150 | * @seq: netlink sequence number | |
36596dad | 151 | * @family: protocol family |
128ad332 | 152 | * @report: notify via unicast netlink message |
96518518 PM |
153 | */ |
154 | struct nft_ctx { | |
99633ab2 | 155 | struct net *net; |
7c95f6d8 PNA |
156 | struct nft_table *table; |
157 | struct nft_chain *chain; | |
0ca743a5 | 158 | const struct nlattr * const *nla; |
128ad332 PNA |
159 | u32 portid; |
160 | u32 seq; | |
36596dad | 161 | u8 family; |
128ad332 | 162 | bool report; |
96518518 PM |
163 | }; |
164 | ||
96518518 PM |
165 | struct nft_data_desc { |
166 | enum nft_data_types type; | |
167 | unsigned int len; | |
168 | }; | |
169 | ||
d0a11fc3 PM |
170 | int nft_data_init(const struct nft_ctx *ctx, |
171 | struct nft_data *data, unsigned int size, | |
5eccdfaa | 172 | struct nft_data_desc *desc, const struct nlattr *nla); |
bb7b40ae | 173 | void nft_data_hold(const struct nft_data *data, enum nft_data_types type); |
59105446 | 174 | void nft_data_release(const struct nft_data *data, enum nft_data_types type); |
5eccdfaa JP |
175 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, |
176 | enum nft_data_types type, unsigned int len); | |
96518518 PM |
177 | |
178 | static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) | |
179 | { | |
180 | return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; | |
181 | } | |
182 | ||
20a69341 PM |
183 | static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) |
184 | { | |
bf798657 | 185 | return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; |
20a69341 PM |
186 | } |
187 | ||
f1d505bb | 188 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); |
b1c96ed3 PM |
189 | unsigned int nft_parse_register(const struct nlattr *attr); |
190 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); | |
191 | ||
d07db988 | 192 | int nft_validate_register_load(enum nft_registers reg, unsigned int len); |
1ec10212 PM |
193 | int nft_validate_register_store(const struct nft_ctx *ctx, |
194 | enum nft_registers reg, | |
195 | const struct nft_data *data, | |
196 | enum nft_data_types type, unsigned int len); | |
96518518 | 197 | |
86f1ec32 PM |
198 | /** |
199 | * struct nft_userdata - user defined data associated with an object | |
200 | * | |
201 | * @len: length of the data | |
202 | * @data: content | |
203 | * | |
204 | * The presence of user data is indicated in an object specific fashion, | |
205 | * so a length of zero can't occur and the value "len" indicates data | |
206 | * of length len + 1. | |
207 | */ | |
208 | struct nft_userdata { | |
209 | u8 len; | |
210 | unsigned char data[0]; | |
211 | }; | |
212 | ||
20a69341 PM |
213 | /** |
214 | * struct nft_set_elem - generic representation of set elements | |
215 | * | |
20a69341 | 216 | * @key: element key |
fe2811eb | 217 | * @priv: element private data and extensions |
20a69341 PM |
218 | */ |
219 | struct nft_set_elem { | |
7d740264 PM |
220 | union { |
221 | u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; | |
222 | struct nft_data val; | |
223 | } key; | |
fe2811eb | 224 | void *priv; |
20a69341 PM |
225 | }; |
226 | ||
227 | struct nft_set; | |
228 | struct nft_set_iter { | |
8588ac09 | 229 | u8 genmask; |
20a69341 PM |
230 | unsigned int count; |
231 | unsigned int skip; | |
232 | int err; | |
233 | int (*fn)(const struct nft_ctx *ctx, | |
de70185d | 234 | struct nft_set *set, |
20a69341 | 235 | const struct nft_set_iter *iter, |
de70185d | 236 | struct nft_set_elem *elem); |
20a69341 PM |
237 | }; |
238 | ||
c50b960c PM |
239 | /** |
240 | * struct nft_set_desc - description of set elements | |
241 | * | |
242 | * @klen: key length | |
243 | * @dlen: data length | |
244 | * @size: number of set elements | |
245 | */ | |
246 | struct nft_set_desc { | |
247 | unsigned int klen; | |
248 | unsigned int dlen; | |
249 | unsigned int size; | |
250 | }; | |
251 | ||
252 | /** | |
253 | * enum nft_set_class - performance class | |
254 | * | |
255 | * @NFT_LOOKUP_O_1: constant, O(1) | |
256 | * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) | |
257 | * @NFT_LOOKUP_O_N: linear, O(N) | |
258 | */ | |
259 | enum nft_set_class { | |
260 | NFT_SET_CLASS_O_1, | |
261 | NFT_SET_CLASS_O_LOG_N, | |
262 | NFT_SET_CLASS_O_N, | |
263 | }; | |
264 | ||
265 | /** | |
266 | * struct nft_set_estimate - estimation of memory and performance | |
267 | * characteristics | |
268 | * | |
269 | * @size: required memory | |
55af753c | 270 | * @lookup: lookup performance class |
0b5a7874 | 271 | * @space: memory class |
c50b960c PM |
272 | */ |
273 | struct nft_set_estimate { | |
274 | unsigned int size; | |
55af753c | 275 | enum nft_set_class lookup; |
0b5a7874 | 276 | enum nft_set_class space; |
c50b960c PM |
277 | }; |
278 | ||
b2832dd6 | 279 | struct nft_set_ext; |
22fe54d5 | 280 | struct nft_expr; |
b2832dd6 | 281 | |
20a69341 PM |
282 | /** |
283 | * struct nft_set_ops - nf_tables set operations | |
284 | * | |
285 | * @lookup: look up an element within the set | |
286 | * @insert: insert new element into set | |
cc02e457 | 287 | * @activate: activate new element in the next generation |
8411b644 | 288 | * @deactivate: lookup for element and deactivate it in the next generation |
1ba1c414 | 289 | * @flush: deactivate element in the next generation |
20a69341 PM |
290 | * @remove: remove element from set |
291 | * @walk: iterate over all set elemeennts | |
ba0e4d99 | 292 | * @get: get set elements |
20a69341 PM |
293 | * @privsize: function to return size of set private data |
294 | * @init: initialize private data of new set instance | |
295 | * @destroy: destroy private data of set instance | |
fe2811eb | 296 | * @elemsize: element private size |
20a69341 PM |
297 | */ |
298 | struct nft_set_ops { | |
42a55769 PNA |
299 | bool (*lookup)(const struct net *net, |
300 | const struct nft_set *set, | |
8cd8937a | 301 | const u32 *key, |
b2832dd6 | 302 | const struct nft_set_ext **ext); |
22fe54d5 | 303 | bool (*update)(struct nft_set *set, |
8cd8937a | 304 | const u32 *key, |
22fe54d5 PM |
305 | void *(*new)(struct nft_set *, |
306 | const struct nft_expr *, | |
a55e22e9 | 307 | struct nft_regs *), |
22fe54d5 | 308 | const struct nft_expr *expr, |
a55e22e9 | 309 | struct nft_regs *regs, |
22fe54d5 PM |
310 | const struct nft_set_ext **ext); |
311 | ||
42a55769 PNA |
312 | int (*insert)(const struct net *net, |
313 | const struct nft_set *set, | |
c016c7e4 PNA |
314 | const struct nft_set_elem *elem, |
315 | struct nft_set_ext **ext); | |
42a55769 PNA |
316 | void (*activate)(const struct net *net, |
317 | const struct nft_set *set, | |
cc02e457 | 318 | const struct nft_set_elem *elem); |
42a55769 PNA |
319 | void * (*deactivate)(const struct net *net, |
320 | const struct nft_set *set, | |
cc02e457 | 321 | const struct nft_set_elem *elem); |
1ba1c414 PNA |
322 | bool (*flush)(const struct net *net, |
323 | const struct nft_set *set, | |
324 | void *priv); | |
5cb82a38 PNA |
325 | void (*remove)(const struct net *net, |
326 | const struct nft_set *set, | |
20a69341 PM |
327 | const struct nft_set_elem *elem); |
328 | void (*walk)(const struct nft_ctx *ctx, | |
de70185d | 329 | struct nft_set *set, |
20a69341 | 330 | struct nft_set_iter *iter); |
ba0e4d99 PNA |
331 | void * (*get)(const struct net *net, |
332 | const struct nft_set *set, | |
333 | const struct nft_set_elem *elem, | |
334 | unsigned int flags); | |
20a69341 | 335 | |
347b408d PNA |
336 | unsigned int (*privsize)(const struct nlattr * const nla[], |
337 | const struct nft_set_desc *desc); | |
c50b960c PM |
338 | bool (*estimate)(const struct nft_set_desc *desc, |
339 | u32 features, | |
340 | struct nft_set_estimate *est); | |
20a69341 | 341 | int (*init)(const struct nft_set *set, |
c50b960c | 342 | const struct nft_set_desc *desc, |
20a69341 PM |
343 | const struct nlattr * const nla[]); |
344 | void (*destroy)(const struct nft_set *set); | |
345 | ||
fe2811eb | 346 | unsigned int elemsize; |
71cc0873 PS |
347 | }; |
348 | ||
349 | /** | |
350 | * struct nft_set_type - nf_tables set type | |
351 | * | |
352 | * @ops: set ops for this type | |
353 | * @list: used internally | |
354 | * @owner: module reference | |
355 | * @features: features supported by the implementation | |
356 | */ | |
357 | struct nft_set_type { | |
358 | const struct nft_set_ops ops; | |
359 | struct list_head list; | |
360 | struct module *owner; | |
20a69341 PM |
361 | u32 features; |
362 | }; | |
71cc0873 | 363 | #define to_set_type(o) container_of(o, struct nft_set_type, ops) |
20a69341 | 364 | |
2b664957 PNA |
365 | int nft_register_set(struct nft_set_type *type); |
366 | void nft_unregister_set(struct nft_set_type *type); | |
20a69341 PM |
367 | |
368 | /** | |
369 | * struct nft_set - nf_tables set instance | |
370 | * | |
371 | * @list: table set list node | |
372 | * @bindings: list of set bindings | |
373 | * @name: name of the set | |
3ecbfd65 | 374 | * @handle: unique handle of the set |
20a69341 PM |
375 | * @ktype: key type (numeric type defined by userspace, not used in the kernel) |
376 | * @dtype: data type (verdict or numeric type defined by userspace) | |
8aeff920 | 377 | * @objtype: object type (see NFT_OBJECT_* definitions) |
c50b960c PM |
378 | * @size: maximum set size |
379 | * @nelems: number of elements | |
3dd0673a | 380 | * @ndeact: number of deactivated elements queued for removal |
d3e2a111 | 381 | * @timeout: default timeout value in jiffies |
761da293 | 382 | * @gc_int: garbage collection interval in msecs |
9363dc4b | 383 | * @policy: set parameterization (see enum nft_set_policies) |
e6d8ecac CFG |
384 | * @udlen: user data length |
385 | * @udata: user data | |
20a69341 PM |
386 | * @ops: set ops |
387 | * @flags: set flags | |
37a9cc52 | 388 | * @genmask: generation mask |
20a69341 PM |
389 | * @klen: key length |
390 | * @dlen: data length | |
391 | * @data: private set data | |
392 | */ | |
393 | struct nft_set { | |
394 | struct list_head list; | |
395 | struct list_head bindings; | |
38745490 | 396 | char *name; |
3ecbfd65 | 397 | u64 handle; |
20a69341 PM |
398 | u32 ktype; |
399 | u32 dtype; | |
8aeff920 | 400 | u32 objtype; |
c50b960c | 401 | u32 size; |
3dd0673a PM |
402 | atomic_t nelems; |
403 | u32 ndeact; | |
761da293 PM |
404 | u64 timeout; |
405 | u32 gc_int; | |
9363dc4b | 406 | u16 policy; |
e6d8ecac CFG |
407 | u16 udlen; |
408 | unsigned char *udata; | |
20a69341 PM |
409 | /* runtime data below here */ |
410 | const struct nft_set_ops *ops ____cacheline_aligned; | |
37a9cc52 PNA |
411 | u16 flags:14, |
412 | genmask:2; | |
20a69341 PM |
413 | u8 klen; |
414 | u8 dlen; | |
415 | unsigned char data[] | |
416 | __attribute__((aligned(__alignof__(u64)))); | |
417 | }; | |
418 | ||
408070d6 PNA |
419 | static inline bool nft_set_is_anonymous(const struct nft_set *set) |
420 | { | |
421 | return set->flags & NFT_SET_ANONYMOUS; | |
422 | } | |
423 | ||
20a69341 PM |
424 | static inline void *nft_set_priv(const struct nft_set *set) |
425 | { | |
426 | return (void *)set->data; | |
427 | } | |
428 | ||
9d098292 PM |
429 | static inline struct nft_set *nft_set_container_of(const void *priv) |
430 | { | |
431 | return (void *)priv - offsetof(struct nft_set, data); | |
432 | } | |
433 | ||
10659cba PNA |
434 | struct nft_set *nft_set_lookup_global(const struct net *net, |
435 | const struct nft_table *table, | |
436 | const struct nlattr *nla_set_name, | |
437 | const struct nlattr *nla_set_id, | |
438 | u8 genmask); | |
20a69341 | 439 | |
761da293 PM |
440 | static inline unsigned long nft_set_gc_interval(const struct nft_set *set) |
441 | { | |
442 | return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ; | |
443 | } | |
444 | ||
20a69341 PM |
445 | /** |
446 | * struct nft_set_binding - nf_tables set binding | |
447 | * | |
448 | * @list: set bindings list node | |
449 | * @chain: chain containing the rule bound to the set | |
11113e19 | 450 | * @flags: set action flags |
20a69341 PM |
451 | * |
452 | * A set binding contains all information necessary for validation | |
453 | * of new elements added to a bound set. | |
454 | */ | |
455 | struct nft_set_binding { | |
456 | struct list_head list; | |
457 | const struct nft_chain *chain; | |
11113e19 | 458 | u32 flags; |
20a69341 PM |
459 | }; |
460 | ||
5eccdfaa JP |
461 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, |
462 | struct nft_set_binding *binding); | |
463 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
464 | struct nft_set_binding *binding); | |
20a69341 | 465 | |
3ac4c07a PM |
466 | /** |
467 | * enum nft_set_extensions - set extension type IDs | |
468 | * | |
469 | * @NFT_SET_EXT_KEY: element key | |
470 | * @NFT_SET_EXT_DATA: mapping data | |
471 | * @NFT_SET_EXT_FLAGS: element flags | |
c3e1b005 PM |
472 | * @NFT_SET_EXT_TIMEOUT: element timeout |
473 | * @NFT_SET_EXT_EXPIRATION: element expiration time | |
68e942e8 | 474 | * @NFT_SET_EXT_USERDATA: user data associated with the element |
f25ad2e9 | 475 | * @NFT_SET_EXT_EXPR: expression assiociated with the element |
8aeff920 | 476 | * @NFT_SET_EXT_OBJREF: stateful object reference associated with element |
3ac4c07a PM |
477 | * @NFT_SET_EXT_NUM: number of extension types |
478 | */ | |
479 | enum nft_set_extensions { | |
480 | NFT_SET_EXT_KEY, | |
481 | NFT_SET_EXT_DATA, | |
482 | NFT_SET_EXT_FLAGS, | |
c3e1b005 PM |
483 | NFT_SET_EXT_TIMEOUT, |
484 | NFT_SET_EXT_EXPIRATION, | |
68e942e8 | 485 | NFT_SET_EXT_USERDATA, |
f25ad2e9 | 486 | NFT_SET_EXT_EXPR, |
8aeff920 | 487 | NFT_SET_EXT_OBJREF, |
3ac4c07a PM |
488 | NFT_SET_EXT_NUM |
489 | }; | |
490 | ||
491 | /** | |
492 | * struct nft_set_ext_type - set extension type | |
493 | * | |
494 | * @len: fixed part length of the extension | |
495 | * @align: alignment requirements of the extension | |
496 | */ | |
497 | struct nft_set_ext_type { | |
498 | u8 len; | |
499 | u8 align; | |
500 | }; | |
501 | ||
502 | extern const struct nft_set_ext_type nft_set_ext_types[]; | |
503 | ||
504 | /** | |
505 | * struct nft_set_ext_tmpl - set extension template | |
506 | * | |
507 | * @len: length of extension area | |
508 | * @offset: offsets of individual extension types | |
509 | */ | |
510 | struct nft_set_ext_tmpl { | |
511 | u16 len; | |
512 | u8 offset[NFT_SET_EXT_NUM]; | |
513 | }; | |
514 | ||
515 | /** | |
516 | * struct nft_set_ext - set extensions | |
517 | * | |
cc02e457 | 518 | * @genmask: generation mask |
3ac4c07a PM |
519 | * @offset: offsets of individual extension types |
520 | * @data: beginning of extension data | |
521 | */ | |
522 | struct nft_set_ext { | |
cc02e457 | 523 | u8 genmask; |
3ac4c07a PM |
524 | u8 offset[NFT_SET_EXT_NUM]; |
525 | char data[0]; | |
526 | }; | |
527 | ||
528 | static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) | |
529 | { | |
530 | memset(tmpl, 0, sizeof(*tmpl)); | |
531 | tmpl->len = sizeof(struct nft_set_ext); | |
532 | } | |
533 | ||
534 | static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, | |
535 | unsigned int len) | |
536 | { | |
537 | tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); | |
538 | BUG_ON(tmpl->len > U8_MAX); | |
539 | tmpl->offset[id] = tmpl->len; | |
540 | tmpl->len += nft_set_ext_types[id].len + len; | |
541 | } | |
542 | ||
543 | static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) | |
544 | { | |
545 | nft_set_ext_add_length(tmpl, id, 0); | |
546 | } | |
547 | ||
548 | static inline void nft_set_ext_init(struct nft_set_ext *ext, | |
549 | const struct nft_set_ext_tmpl *tmpl) | |
550 | { | |
551 | memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); | |
552 | } | |
553 | ||
554 | static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) | |
555 | { | |
556 | return !!ext->offset[id]; | |
557 | } | |
558 | ||
559 | static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) | |
560 | { | |
561 | return ext && __nft_set_ext_exists(ext, id); | |
562 | } | |
563 | ||
564 | static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) | |
565 | { | |
566 | return (void *)ext + ext->offset[id]; | |
567 | } | |
568 | ||
569 | static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) | |
570 | { | |
571 | return nft_set_ext(ext, NFT_SET_EXT_KEY); | |
572 | } | |
573 | ||
574 | static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) | |
575 | { | |
576 | return nft_set_ext(ext, NFT_SET_EXT_DATA); | |
577 | } | |
578 | ||
579 | static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) | |
580 | { | |
581 | return nft_set_ext(ext, NFT_SET_EXT_FLAGS); | |
582 | } | |
ef1f7df9 | 583 | |
c3e1b005 PM |
584 | static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) |
585 | { | |
586 | return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); | |
587 | } | |
588 | ||
8e1102d5 | 589 | static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) |
c3e1b005 PM |
590 | { |
591 | return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); | |
592 | } | |
593 | ||
68e942e8 PM |
594 | static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) |
595 | { | |
596 | return nft_set_ext(ext, NFT_SET_EXT_USERDATA); | |
597 | } | |
598 | ||
f25ad2e9 PM |
599 | static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext) |
600 | { | |
601 | return nft_set_ext(ext, NFT_SET_EXT_EXPR); | |
602 | } | |
603 | ||
c3e1b005 PM |
604 | static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) |
605 | { | |
606 | return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && | |
8e1102d5 | 607 | time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext)); |
c3e1b005 PM |
608 | } |
609 | ||
fe2811eb PM |
610 | static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, |
611 | void *elem) | |
612 | { | |
613 | return elem + set->ops->elemsize; | |
614 | } | |
615 | ||
8aeff920 PNA |
616 | static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) |
617 | { | |
618 | return nft_set_ext(ext, NFT_SET_EXT_OBJREF); | |
619 | } | |
620 | ||
22fe54d5 PM |
621 | void *nft_set_elem_init(const struct nft_set *set, |
622 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 623 | const u32 *key, const u32 *data, |
22fe54d5 | 624 | u64 timeout, gfp_t gfp); |
61f9e292 LZ |
625 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
626 | bool destroy_expr); | |
61edafbb | 627 | |
cfed7e1b PM |
628 | /** |
629 | * struct nft_set_gc_batch_head - nf_tables set garbage collection batch | |
630 | * | |
631 | * @rcu: rcu head | |
632 | * @set: set the elements belong to | |
633 | * @cnt: count of elements | |
634 | */ | |
635 | struct nft_set_gc_batch_head { | |
636 | struct rcu_head rcu; | |
637 | const struct nft_set *set; | |
638 | unsigned int cnt; | |
639 | }; | |
640 | ||
641 | #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ | |
642 | sizeof(struct nft_set_gc_batch_head)) / \ | |
643 | sizeof(void *)) | |
644 | ||
645 | /** | |
646 | * struct nft_set_gc_batch - nf_tables set garbage collection batch | |
647 | * | |
648 | * @head: GC batch head | |
649 | * @elems: garbage collection elements | |
650 | */ | |
651 | struct nft_set_gc_batch { | |
652 | struct nft_set_gc_batch_head head; | |
653 | void *elems[NFT_SET_GC_BATCH_SIZE]; | |
654 | }; | |
655 | ||
656 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
657 | gfp_t gfp); | |
658 | void nft_set_gc_batch_release(struct rcu_head *rcu); | |
659 | ||
660 | static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) | |
661 | { | |
662 | if (gcb != NULL) | |
663 | call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); | |
664 | } | |
665 | ||
666 | static inline struct nft_set_gc_batch * | |
667 | nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, | |
668 | gfp_t gfp) | |
669 | { | |
670 | if (gcb != NULL) { | |
671 | if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) | |
672 | return gcb; | |
673 | nft_set_gc_batch_complete(gcb); | |
674 | } | |
675 | return nft_set_gc_batch_alloc(set, gfp); | |
676 | } | |
677 | ||
678 | static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, | |
679 | void *elem) | |
680 | { | |
681 | gcb->elems[gcb->head.cnt++] = elem; | |
682 | } | |
683 | ||
96518518 | 684 | /** |
ef1f7df9 | 685 | * struct nft_expr_type - nf_tables expression type |
96518518 | 686 | * |
ef1f7df9 PM |
687 | * @select_ops: function to select nft_expr_ops |
688 | * @ops: default ops, used when no select_ops functions is present | |
96518518 PM |
689 | * @list: used internally |
690 | * @name: Identifier | |
691 | * @owner: module reference | |
692 | * @policy: netlink attribute policy | |
693 | * @maxattr: highest netlink attribute number | |
64d46806 | 694 | * @family: address family for AF-specific types |
151d799a | 695 | * @flags: expression type flags |
ef1f7df9 PM |
696 | */ |
697 | struct nft_expr_type { | |
0ca743a5 PNA |
698 | const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, |
699 | const struct nlattr * const tb[]); | |
ef1f7df9 PM |
700 | const struct nft_expr_ops *ops; |
701 | struct list_head list; | |
702 | const char *name; | |
703 | struct module *owner; | |
704 | const struct nla_policy *policy; | |
705 | unsigned int maxattr; | |
64d46806 | 706 | u8 family; |
151d799a | 707 | u8 flags; |
ef1f7df9 PM |
708 | }; |
709 | ||
151d799a PM |
710 | #define NFT_EXPR_STATEFUL 0x1 |
711 | ||
ef1f7df9 PM |
712 | /** |
713 | * struct nft_expr_ops - nf_tables expression operations | |
714 | * | |
715 | * @eval: Expression evaluation function | |
96518518 | 716 | * @size: full expression size, including private data size |
ef1f7df9 PM |
717 | * @init: initialization function |
718 | * @destroy: destruction function | |
719 | * @dump: function to dump parameters | |
720 | * @type: expression type | |
0ca743a5 PNA |
721 | * @validate: validate expression, called during loop detection |
722 | * @data: extra data to attach to this expression operation | |
96518518 PM |
723 | */ |
724 | struct nft_expr; | |
725 | struct nft_expr_ops { | |
726 | void (*eval)(const struct nft_expr *expr, | |
a55e22e9 | 727 | struct nft_regs *regs, |
96518518 | 728 | const struct nft_pktinfo *pkt); |
086f3321 PNA |
729 | int (*clone)(struct nft_expr *dst, |
730 | const struct nft_expr *src); | |
ef1f7df9 PM |
731 | unsigned int size; |
732 | ||
96518518 PM |
733 | int (*init)(const struct nft_ctx *ctx, |
734 | const struct nft_expr *expr, | |
735 | const struct nlattr * const tb[]); | |
bb7b40ae PNA |
736 | void (*activate)(const struct nft_ctx *ctx, |
737 | const struct nft_expr *expr); | |
738 | void (*deactivate)(const struct nft_ctx *ctx, | |
739 | const struct nft_expr *expr); | |
62472bce PM |
740 | void (*destroy)(const struct nft_ctx *ctx, |
741 | const struct nft_expr *expr); | |
96518518 PM |
742 | int (*dump)(struct sk_buff *skb, |
743 | const struct nft_expr *expr); | |
0ca743a5 PNA |
744 | int (*validate)(const struct nft_ctx *ctx, |
745 | const struct nft_expr *expr, | |
746 | const struct nft_data **data); | |
ef1f7df9 | 747 | const struct nft_expr_type *type; |
0ca743a5 | 748 | void *data; |
96518518 PM |
749 | }; |
750 | ||
ef1f7df9 | 751 | #define NFT_EXPR_MAXATTR 16 |
96518518 PM |
752 | #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ |
753 | ALIGN(size, __alignof__(struct nft_expr))) | |
754 | ||
755 | /** | |
756 | * struct nft_expr - nf_tables expression | |
757 | * | |
758 | * @ops: expression ops | |
759 | * @data: expression private data | |
760 | */ | |
761 | struct nft_expr { | |
762 | const struct nft_expr_ops *ops; | |
763 | unsigned char data[]; | |
764 | }; | |
765 | ||
766 | static inline void *nft_expr_priv(const struct nft_expr *expr) | |
767 | { | |
768 | return (void *)expr->data; | |
769 | } | |
770 | ||
0b2d8a7b PM |
771 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
772 | const struct nlattr *nla); | |
773 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); | |
774 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, | |
775 | const struct nft_expr *expr); | |
776 | ||
086f3321 | 777 | static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) |
0b2d8a7b | 778 | { |
086f3321 PNA |
779 | int err; |
780 | ||
086f3321 PNA |
781 | if (src->ops->clone) { |
782 | dst->ops = src->ops; | |
783 | err = src->ops->clone(dst, src); | |
784 | if (err < 0) | |
785 | return err; | |
786 | } else { | |
787 | memcpy(dst, src, src->ops->size); | |
788 | } | |
61f9e292 LZ |
789 | |
790 | __module_get(src->ops->type->owner); | |
086f3321 | 791 | return 0; |
0b2d8a7b PM |
792 | } |
793 | ||
96518518 PM |
794 | /** |
795 | * struct nft_rule - nf_tables rule | |
796 | * | |
797 | * @list: used internally | |
96518518 | 798 | * @handle: rule handle |
0628b123 | 799 | * @genmask: generation mask |
96518518 | 800 | * @dlen: length of expression data |
86f1ec32 | 801 | * @udata: user data is appended to the rule |
96518518 PM |
802 | * @data: expression data |
803 | */ | |
804 | struct nft_rule { | |
805 | struct list_head list; | |
0768b3b3 | 806 | u64 handle:42, |
0628b123 | 807 | genmask:2, |
0768b3b3 | 808 | dlen:12, |
86f1ec32 | 809 | udata:1; |
96518518 PM |
810 | unsigned char data[] |
811 | __attribute__((aligned(__alignof__(struct nft_expr)))); | |
812 | }; | |
813 | ||
814 | static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) | |
815 | { | |
816 | return (struct nft_expr *)&rule->data[0]; | |
817 | } | |
818 | ||
819 | static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) | |
820 | { | |
821 | return ((void *)expr) + expr->ops->size; | |
822 | } | |
823 | ||
824 | static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) | |
825 | { | |
826 | return (struct nft_expr *)&rule->data[rule->dlen]; | |
827 | } | |
828 | ||
86f1ec32 | 829 | static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) |
0768b3b3 PNA |
830 | { |
831 | return (void *)&rule->data[rule->dlen]; | |
832 | } | |
833 | ||
96518518 PM |
834 | /* |
835 | * The last pointer isn't really necessary, but the compiler isn't able to | |
836 | * determine that the result of nft_expr_last() is always the same since it | |
837 | * can't assume that the dlen value wasn't changed within calls in the loop. | |
838 | */ | |
839 | #define nft_rule_for_each_expr(expr, last, rule) \ | |
840 | for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ | |
841 | (expr) != (last); \ | |
842 | (expr) = nft_expr_next(expr)) | |
843 | ||
844 | enum nft_chain_flags { | |
845 | NFT_BASE_CHAIN = 0x1, | |
96518518 PM |
846 | }; |
847 | ||
848 | /** | |
849 | * struct nft_chain - nf_tables chain | |
850 | * | |
851 | * @rules: list of rules in the chain | |
852 | * @list: used internally | |
b5bc89bf | 853 | * @table: table that this chain belongs to |
96518518 | 854 | * @handle: chain handle |
96518518 PM |
855 | * @use: number of jump references to this chain |
856 | * @level: length of longest path to this chain | |
a0a7379e | 857 | * @flags: bitmask of enum nft_chain_flags |
96518518 PM |
858 | * @name: name of the chain |
859 | */ | |
860 | struct nft_chain { | |
0cbc06b3 FW |
861 | struct nft_rule *__rcu *rules_gen_0; |
862 | struct nft_rule *__rcu *rules_gen_1; | |
96518518 PM |
863 | struct list_head rules; |
864 | struct list_head list; | |
b5bc89bf | 865 | struct nft_table *table; |
96518518 | 866 | u64 handle; |
a0a7379e | 867 | u32 use; |
96518518 | 868 | u16 level; |
664b0f8c PNA |
869 | u8 flags:6, |
870 | genmask:2; | |
b7263e07 | 871 | char *name; |
0cbc06b3 FW |
872 | |
873 | /* Only used during control plane commit phase: */ | |
874 | struct nft_rule **rules_next; | |
96518518 PM |
875 | }; |
876 | ||
a654de8f PNA |
877 | int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); |
878 | ||
32537e91 | 879 | enum nft_chain_types { |
9370761c PNA |
880 | NFT_CHAIN_T_DEFAULT = 0, |
881 | NFT_CHAIN_T_ROUTE, | |
882 | NFT_CHAIN_T_NAT, | |
883 | NFT_CHAIN_T_MAX | |
884 | }; | |
885 | ||
1a1e1a12 | 886 | /** |
32537e91 | 887 | * struct nft_chain_type - nf_tables chain type info |
1a1e1a12 PM |
888 | * |
889 | * @name: name of the type | |
890 | * @type: numeric identifier | |
891 | * @family: address family | |
892 | * @owner: module owner | |
893 | * @hook_mask: mask of valid hooks | |
c2f9eafe | 894 | * @hooks: array of hook functions |
4e25ceb8 FW |
895 | * @ops_register: base chain register function |
896 | * @ops_unregister: base chain unregister function | |
1a1e1a12 | 897 | */ |
32537e91 | 898 | struct nft_chain_type { |
1a1e1a12 | 899 | const char *name; |
32537e91 | 900 | enum nft_chain_types type; |
1a1e1a12 PM |
901 | int family; |
902 | struct module *owner; | |
903 | unsigned int hook_mask; | |
904 | nf_hookfn *hooks[NF_MAX_HOOKS]; | |
4e25ceb8 FW |
905 | int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); |
906 | void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); | |
1a1e1a12 PM |
907 | }; |
908 | ||
7210e4e3 | 909 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
32537e91 | 910 | enum nft_chain_types type); |
75e8d06d PNA |
911 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
912 | unsigned int hook_flags); | |
7210e4e3 | 913 | |
0ca743a5 | 914 | struct nft_stats { |
ce355e20 ED |
915 | u64 bytes; |
916 | u64 pkts; | |
917 | struct u64_stats_sync syncp; | |
0ca743a5 PNA |
918 | }; |
919 | ||
96518518 PM |
920 | /** |
921 | * struct nft_base_chain - nf_tables base chain | |
922 | * | |
923 | * @ops: netfilter hook ops | |
9370761c | 924 | * @type: chain type |
0ca743a5 PNA |
925 | * @policy: default policy |
926 | * @stats: per-cpu chain stats | |
96518518 | 927 | * @chain: the chain |
2cbce139 | 928 | * @dev_name: device name that this base chain is attached to (if any) |
96518518 PM |
929 | */ |
930 | struct nft_base_chain { | |
c974a3a3 | 931 | struct nf_hook_ops ops; |
32537e91 | 932 | const struct nft_chain_type *type; |
0ca743a5 | 933 | u8 policy; |
835b8033 | 934 | u8 flags; |
0ca743a5 | 935 | struct nft_stats __percpu *stats; |
96518518 | 936 | struct nft_chain chain; |
2cbce139 | 937 | char dev_name[IFNAMSIZ]; |
96518518 PM |
938 | }; |
939 | ||
940 | static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) | |
941 | { | |
942 | return container_of(chain, struct nft_base_chain, chain); | |
943 | } | |
944 | ||
f323d954 PNA |
945 | static inline bool nft_is_base_chain(const struct nft_chain *chain) |
946 | { | |
947 | return chain->flags & NFT_BASE_CHAIN; | |
948 | } | |
949 | ||
5ebe0b0e | 950 | int __nft_release_basechain(struct nft_ctx *ctx); |
835b8033 | 951 | |
06198b34 | 952 | unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); |
96518518 | 953 | |
96518518 PM |
954 | /** |
955 | * struct nft_table - nf_tables table | |
956 | * | |
957 | * @list: used internally | |
958 | * @chains: chains in the table | |
959 | * @sets: sets in the table | |
e5009240 | 960 | * @objects: stateful objects in the table |
3b49e2e9 | 961 | * @flowtables: flow tables in the table |
96518518 | 962 | * @hgenerator: handle generator state |
3ecbfd65 | 963 | * @handle: table handle |
96518518 PM |
964 | * @use: number of chain references to this table |
965 | * @flags: table flag (see enum nft_table_flags) | |
f2a6d766 | 966 | * @genmask: generation mask |
36596dad | 967 | * @afinfo: address family info |
96518518 PM |
968 | * @name: name of the table |
969 | */ | |
970 | struct nft_table { | |
971 | struct list_head list; | |
972 | struct list_head chains; | |
973 | struct list_head sets; | |
e5009240 | 974 | struct list_head objects; |
3b49e2e9 | 975 | struct list_head flowtables; |
96518518 | 976 | u64 hgenerator; |
3ecbfd65 | 977 | u64 handle; |
96518518 | 978 | u32 use; |
98319cb9 PNA |
979 | u16 family:6, |
980 | flags:8, | |
f2a6d766 | 981 | genmask:2; |
e46abbcc | 982 | char *name; |
ebddf1a8 PNA |
983 | }; |
984 | ||
cc07eeb0 | 985 | void nft_register_chain_type(const struct nft_chain_type *); |
32537e91 | 986 | void nft_unregister_chain_type(const struct nft_chain_type *); |
96518518 | 987 | |
5eccdfaa JP |
988 | int nft_register_expr(struct nft_expr_type *); |
989 | void nft_unregister_expr(struct nft_expr_type *); | |
96518518 | 990 | |
33d5a7b1 FW |
991 | int nft_verdict_dump(struct sk_buff *skb, int type, |
992 | const struct nft_verdict *v); | |
993 | ||
e5009240 PNA |
994 | /** |
995 | * struct nft_object - nf_tables stateful object | |
996 | * | |
997 | * @list: table stateful object list node | |
18965317 | 998 | * @table: table this object belongs to |
e5009240 PNA |
999 | * @name: name of this stateful object |
1000 | * @genmask: generation mask | |
1001 | * @use: number of references to this stateful object | |
3ecbfd65 | 1002 | * @handle: unique object handle |
dfc46034 | 1003 | * @ops: object operations |
3ecbfd65 | 1004 | * @data: object data, layout depends on type |
e5009240 PNA |
1005 | */ |
1006 | struct nft_object { | |
1007 | struct list_head list; | |
61509575 | 1008 | char *name; |
18965317 | 1009 | struct nft_table *table; |
e5009240 PNA |
1010 | u32 genmask:2, |
1011 | use:30; | |
3ecbfd65 | 1012 | u64 handle; |
e5009240 | 1013 | /* runtime data below here */ |
dfc46034 | 1014 | const struct nft_object_ops *ops ____cacheline_aligned; |
e5009240 PNA |
1015 | unsigned char data[] |
1016 | __attribute__((aligned(__alignof__(u64)))); | |
1017 | }; | |
1018 | ||
1019 | static inline void *nft_obj_data(const struct nft_object *obj) | |
1020 | { | |
1021 | return (void *)obj->data; | |
1022 | } | |
1023 | ||
1024 | #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) | |
1025 | ||
cac20fcd PNA |
1026 | struct nft_object *nft_obj_lookup(const struct nft_table *table, |
1027 | const struct nlattr *nla, u32 objtype, | |
1028 | u8 genmask); | |
e5009240 | 1029 | |
25e94a99 PNA |
1030 | void nft_obj_notify(struct net *net, struct nft_table *table, |
1031 | struct nft_object *obj, u32 portid, u32 seq, | |
1032 | int event, int family, int report, gfp_t gfp); | |
2599e989 | 1033 | |
e5009240 PNA |
1034 | /** |
1035 | * struct nft_object_type - stateful object type | |
1036 | * | |
dfc46034 PBG |
1037 | * @select_ops: function to select nft_object_ops |
1038 | * @ops: default ops, used when no select_ops functions is present | |
e5009240 PNA |
1039 | * @list: list node in list of object types |
1040 | * @type: stateful object numeric type | |
e5009240 PNA |
1041 | * @owner: module owner |
1042 | * @maxattr: maximum netlink attribute | |
1043 | * @policy: netlink attribute policy | |
dfc46034 PBG |
1044 | */ |
1045 | struct nft_object_type { | |
1046 | const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, | |
1047 | const struct nlattr * const tb[]); | |
1048 | const struct nft_object_ops *ops; | |
1049 | struct list_head list; | |
1050 | u32 type; | |
1051 | unsigned int maxattr; | |
1052 | struct module *owner; | |
1053 | const struct nla_policy *policy; | |
1054 | }; | |
1055 | ||
1056 | /** | |
1057 | * struct nft_object_ops - stateful object operations | |
1058 | * | |
1059 | * @eval: stateful object evaluation function | |
1060 | * @size: stateful object size | |
e5009240 PNA |
1061 | * @init: initialize object from netlink attributes |
1062 | * @destroy: release existing stateful object | |
1063 | * @dump: netlink dump stateful object | |
1064 | */ | |
dfc46034 | 1065 | struct nft_object_ops { |
e5009240 PNA |
1066 | void (*eval)(struct nft_object *obj, |
1067 | struct nft_regs *regs, | |
1068 | const struct nft_pktinfo *pkt); | |
e5009240 | 1069 | unsigned int size; |
84fba055 FW |
1070 | int (*init)(const struct nft_ctx *ctx, |
1071 | const struct nlattr *const tb[], | |
e5009240 | 1072 | struct nft_object *obj); |
00bfb320 PNA |
1073 | void (*destroy)(const struct nft_ctx *ctx, |
1074 | struct nft_object *obj); | |
e5009240 | 1075 | int (*dump)(struct sk_buff *skb, |
43da04a5 PNA |
1076 | struct nft_object *obj, |
1077 | bool reset); | |
dfc46034 | 1078 | const struct nft_object_type *type; |
e5009240 PNA |
1079 | }; |
1080 | ||
1081 | int nft_register_obj(struct nft_object_type *obj_type); | |
1082 | void nft_unregister_obj(struct nft_object_type *obj_type); | |
1083 | ||
d92191aa PNA |
1084 | #define NFT_FLOWTABLE_DEVICE_MAX 8 |
1085 | ||
3b49e2e9 PNA |
1086 | /** |
1087 | * struct nft_flowtable - nf_tables flow table | |
1088 | * | |
1089 | * @list: flow table list node in table list | |
1090 | * @table: the table the flow table is contained in | |
1091 | * @name: name of this flow table | |
1092 | * @hooknum: hook number | |
1093 | * @priority: hook priority | |
1094 | * @ops_len: number of hooks in array | |
1095 | * @genmask: generation mask | |
1096 | * @use: number of references to this flow table | |
3ecbfd65 | 1097 | * @handle: unique object handle |
d92191aa | 1098 | * @dev_name: array of device names |
3b49e2e9 PNA |
1099 | * @data: rhashtable and garbage collector |
1100 | * @ops: array of hooks | |
1101 | */ | |
1102 | struct nft_flowtable { | |
1103 | struct list_head list; | |
1104 | struct nft_table *table; | |
1105 | char *name; | |
1106 | int hooknum; | |
1107 | int priority; | |
1108 | int ops_len; | |
1109 | u32 genmask:2, | |
1110 | use:30; | |
3ecbfd65 | 1111 | u64 handle; |
d92191aa | 1112 | char *dev_name[NFT_FLOWTABLE_DEVICE_MAX]; |
3b49e2e9 PNA |
1113 | /* runtime data below here */ |
1114 | struct nf_hook_ops *ops ____cacheline_aligned; | |
1115 | struct nf_flowtable data; | |
1116 | }; | |
1117 | ||
cac20fcd PNA |
1118 | struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, |
1119 | const struct nlattr *nla, | |
1120 | u8 genmask); | |
3b49e2e9 PNA |
1121 | |
1122 | void nft_register_flowtable_type(struct nf_flowtable_type *type); | |
1123 | void nft_unregister_flowtable_type(struct nf_flowtable_type *type); | |
1124 | ||
33d5a7b1 FW |
1125 | /** |
1126 | * struct nft_traceinfo - nft tracing information and state | |
1127 | * | |
1128 | * @pkt: pktinfo currently processed | |
1129 | * @basechain: base chain currently processed | |
1130 | * @chain: chain currently processed | |
1131 | * @rule: rule that was evaluated | |
1132 | * @verdict: verdict given by rule | |
1133 | * @type: event type (enum nft_trace_types) | |
1134 | * @packet_dumped: packet headers sent in a previous traceinfo message | |
1135 | * @trace: other struct members are initialised | |
1136 | */ | |
1137 | struct nft_traceinfo { | |
1138 | const struct nft_pktinfo *pkt; | |
1139 | const struct nft_base_chain *basechain; | |
1140 | const struct nft_chain *chain; | |
1141 | const struct nft_rule *rule; | |
1142 | const struct nft_verdict *verdict; | |
1143 | enum nft_trace_types type; | |
1144 | bool packet_dumped; | |
1145 | bool trace; | |
1146 | }; | |
1147 | ||
1148 | void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, | |
1149 | const struct nft_verdict *verdict, | |
1150 | const struct nft_chain *basechain); | |
1151 | ||
1152 | void nft_trace_notify(struct nft_traceinfo *info); | |
1153 | ||
9370761c PNA |
1154 | #define MODULE_ALIAS_NFT_CHAIN(family, name) \ |
1155 | MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) | |
96518518 | 1156 | |
64d46806 PM |
1157 | #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ |
1158 | MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) | |
1159 | ||
96518518 PM |
1160 | #define MODULE_ALIAS_NFT_EXPR(name) \ |
1161 | MODULE_ALIAS("nft-expr-" name) | |
1162 | ||
20a69341 PM |
1163 | #define MODULE_ALIAS_NFT_SET() \ |
1164 | MODULE_ALIAS("nft-set") | |
1165 | ||
e5009240 PNA |
1166 | #define MODULE_ALIAS_NFT_OBJ(type) \ |
1167 | MODULE_ALIAS("nft-obj-" __stringify(type)) | |
1168 | ||
ea4bd995 PM |
1169 | /* |
1170 | * The gencursor defines two generations, the currently active and the | |
1171 | * next one. Objects contain a bitmask of 2 bits specifying the generations | |
1172 | * they're active in. A set bit means they're inactive in the generation | |
1173 | * represented by that bit. | |
1174 | * | |
1175 | * New objects start out as inactive in the current and active in the | |
1176 | * next generation. When committing the ruleset the bitmask is cleared, | |
1177 | * meaning they're active in all generations. When removing an object, | |
1178 | * it is set inactive in the next generation. After committing the ruleset, | |
1179 | * the objects are removed. | |
1180 | */ | |
1181 | static inline unsigned int nft_gencursor_next(const struct net *net) | |
1182 | { | |
1183 | return net->nft.gencursor + 1 == 1 ? 1 : 0; | |
1184 | } | |
1185 | ||
1186 | static inline u8 nft_genmask_next(const struct net *net) | |
1187 | { | |
1188 | return 1 << nft_gencursor_next(net); | |
1189 | } | |
1190 | ||
1191 | static inline u8 nft_genmask_cur(const struct net *net) | |
1192 | { | |
14cd5d4a MR |
1193 | /* Use READ_ONCE() to prevent refetching the value for atomicity */ |
1194 | return 1 << READ_ONCE(net->nft.gencursor); | |
ea4bd995 PM |
1195 | } |
1196 | ||
22fe54d5 PM |
1197 | #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) |
1198 | ||
889f7ee7 PNA |
1199 | /* |
1200 | * Generic transaction helpers | |
1201 | */ | |
1202 | ||
1203 | /* Check if this object is currently active. */ | |
1204 | #define nft_is_active(__net, __obj) \ | |
1205 | (((__obj)->genmask & nft_genmask_cur(__net)) == 0) | |
1206 | ||
1207 | /* Check if this object is active in the next generation. */ | |
1208 | #define nft_is_active_next(__net, __obj) \ | |
1209 | (((__obj)->genmask & nft_genmask_next(__net)) == 0) | |
1210 | ||
1211 | /* This object becomes active in the next generation. */ | |
1212 | #define nft_activate_next(__net, __obj) \ | |
1213 | (__obj)->genmask = nft_genmask_cur(__net) | |
1214 | ||
1215 | /* This object becomes inactive in the next generation. */ | |
1216 | #define nft_deactivate_next(__net, __obj) \ | |
1217 | (__obj)->genmask = nft_genmask_next(__net) | |
1218 | ||
1219 | /* After committing the ruleset, clear the stale generation bit. */ | |
1220 | #define nft_clear(__net, __obj) \ | |
1221 | (__obj)->genmask &= ~nft_genmask_next(__net) | |
f2a6d766 PNA |
1222 | #define nft_active_genmask(__obj, __genmask) \ |
1223 | !((__obj)->genmask & __genmask) | |
889f7ee7 | 1224 | |
cc02e457 PM |
1225 | /* |
1226 | * Set element transaction helpers | |
1227 | */ | |
1228 | ||
1229 | static inline bool nft_set_elem_active(const struct nft_set_ext *ext, | |
1230 | u8 genmask) | |
1231 | { | |
1232 | return !(ext->genmask & genmask); | |
1233 | } | |
1234 | ||
42a55769 PNA |
1235 | static inline void nft_set_elem_change_active(const struct net *net, |
1236 | const struct nft_set *set, | |
cc02e457 PM |
1237 | struct nft_set_ext *ext) |
1238 | { | |
42a55769 | 1239 | ext->genmask ^= nft_genmask_next(net); |
cc02e457 PM |
1240 | } |
1241 | ||
69086658 PM |
1242 | /* |
1243 | * We use a free bit in the genmask field to indicate the element | |
1244 | * is busy, meaning it is currently being processed either by | |
1245 | * the netlink API or GC. | |
1246 | * | |
1247 | * Even though the genmask is only a single byte wide, this works | |
1248 | * because the extension structure if fully constant once initialized, | |
1249 | * so there are no non-atomic write accesses unless it is already | |
1250 | * marked busy. | |
1251 | */ | |
1252 | #define NFT_SET_ELEM_BUSY_MASK (1 << 2) | |
1253 | ||
1254 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
1255 | #define NFT_SET_ELEM_BUSY_BIT 2 | |
1256 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
1257 | #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) | |
1258 | #else | |
1259 | #error | |
1260 | #endif | |
1261 | ||
1262 | static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) | |
1263 | { | |
1264 | unsigned long *word = (unsigned long *)ext; | |
1265 | ||
1266 | BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); | |
1267 | return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); | |
1268 | } | |
1269 | ||
1270 | static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) | |
1271 | { | |
1272 | unsigned long *word = (unsigned long *)ext; | |
1273 | ||
1274 | clear_bit(NFT_SET_ELEM_BUSY_BIT, word); | |
1275 | } | |
1276 | ||
1a1e1a12 PM |
1277 | /** |
1278 | * struct nft_trans - nf_tables object update in transaction | |
1279 | * | |
1280 | * @list: used internally | |
1281 | * @msg_type: message type | |
1282 | * @ctx: transaction context | |
1283 | * @data: internal information related to the transaction | |
1284 | */ | |
1285 | struct nft_trans { | |
1286 | struct list_head list; | |
1287 | int msg_type; | |
1288 | struct nft_ctx ctx; | |
1289 | char data[0]; | |
1290 | }; | |
1291 | ||
1292 | struct nft_trans_rule { | |
1293 | struct nft_rule *rule; | |
1a94e38d | 1294 | u32 rule_id; |
1a1e1a12 PM |
1295 | }; |
1296 | ||
1297 | #define nft_trans_rule(trans) \ | |
1298 | (((struct nft_trans_rule *)trans->data)->rule) | |
1a94e38d PNA |
1299 | #define nft_trans_rule_id(trans) \ |
1300 | (((struct nft_trans_rule *)trans->data)->rule_id) | |
1a1e1a12 PM |
1301 | |
1302 | struct nft_trans_set { | |
1303 | struct nft_set *set; | |
1304 | u32 set_id; | |
1305 | }; | |
1306 | ||
1307 | #define nft_trans_set(trans) \ | |
1308 | (((struct nft_trans_set *)trans->data)->set) | |
1309 | #define nft_trans_set_id(trans) \ | |
1310 | (((struct nft_trans_set *)trans->data)->set_id) | |
1311 | ||
1312 | struct nft_trans_chain { | |
1313 | bool update; | |
b7263e07 | 1314 | char *name; |
1a1e1a12 PM |
1315 | struct nft_stats __percpu *stats; |
1316 | u8 policy; | |
1317 | }; | |
1318 | ||
1319 | #define nft_trans_chain_update(trans) \ | |
1320 | (((struct nft_trans_chain *)trans->data)->update) | |
1321 | #define nft_trans_chain_name(trans) \ | |
1322 | (((struct nft_trans_chain *)trans->data)->name) | |
1323 | #define nft_trans_chain_stats(trans) \ | |
1324 | (((struct nft_trans_chain *)trans->data)->stats) | |
1325 | #define nft_trans_chain_policy(trans) \ | |
1326 | (((struct nft_trans_chain *)trans->data)->policy) | |
1327 | ||
1328 | struct nft_trans_table { | |
1329 | bool update; | |
1330 | bool enable; | |
1331 | }; | |
1332 | ||
1333 | #define nft_trans_table_update(trans) \ | |
1334 | (((struct nft_trans_table *)trans->data)->update) | |
1335 | #define nft_trans_table_enable(trans) \ | |
1336 | (((struct nft_trans_table *)trans->data)->enable) | |
1337 | ||
1338 | struct nft_trans_elem { | |
1339 | struct nft_set *set; | |
1340 | struct nft_set_elem elem; | |
1341 | }; | |
1342 | ||
1343 | #define nft_trans_elem_set(trans) \ | |
1344 | (((struct nft_trans_elem *)trans->data)->set) | |
1345 | #define nft_trans_elem(trans) \ | |
1346 | (((struct nft_trans_elem *)trans->data)->elem) | |
1347 | ||
e5009240 PNA |
1348 | struct nft_trans_obj { |
1349 | struct nft_object *obj; | |
1350 | }; | |
1351 | ||
1352 | #define nft_trans_obj(trans) \ | |
1353 | (((struct nft_trans_obj *)trans->data)->obj) | |
1354 | ||
3b49e2e9 PNA |
1355 | struct nft_trans_flowtable { |
1356 | struct nft_flowtable *flowtable; | |
1357 | }; | |
1358 | ||
1359 | #define nft_trans_flowtable(trans) \ | |
1360 | (((struct nft_trans_flowtable *)trans->data)->flowtable) | |
1361 | ||
02c7b25e PNA |
1362 | int __init nft_chain_filter_init(void); |
1363 | void __exit nft_chain_filter_fini(void); | |
1364 | ||
96518518 | 1365 | #endif /* _NET_NF_TABLES_H */ |