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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> |
1b2470e5 | 12 | #include <linux/rhashtable.h> |
3b49e2e9 | 13 | #include <net/netfilter/nf_flow_table.h> |
96518518 PM |
14 | #include <net/netlink.h> |
15 | ||
20a69341 PM |
16 | #define NFT_JUMP_STACK_SIZE 16 |
17 | ||
96518518 PM |
18 | struct nft_pktinfo { |
19 | struct sk_buff *skb; | |
beac5afa | 20 | bool tprot_set; |
4566bf27 | 21 | u8 tprot; |
0ca743a5 PNA |
22 | /* for x_tables compatibility */ |
23 | struct xt_action_param xt; | |
96518518 PM |
24 | }; |
25 | ||
0e5a1c7e PNA |
26 | static inline struct net *nft_net(const struct nft_pktinfo *pkt) |
27 | { | |
28 | return pkt->xt.state->net; | |
29 | } | |
30 | ||
31 | static inline unsigned int nft_hook(const struct nft_pktinfo *pkt) | |
32 | { | |
33 | return pkt->xt.state->hook; | |
34 | } | |
35 | ||
36 | static inline u8 nft_pf(const struct nft_pktinfo *pkt) | |
37 | { | |
38 | return pkt->xt.state->pf; | |
39 | } | |
40 | ||
41 | static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt) | |
42 | { | |
43 | return pkt->xt.state->in; | |
44 | } | |
45 | ||
46 | static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt) | |
47 | { | |
48 | return pkt->xt.state->out; | |
49 | } | |
50 | ||
0ca743a5 | 51 | static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, |
0ca743a5 | 52 | struct sk_buff *skb, |
073bfd56 | 53 | const struct nf_hook_state *state) |
0ca743a5 PNA |
54 | { |
55 | pkt->skb = skb; | |
613dbd95 | 56 | pkt->xt.state = state; |
0ca743a5 PNA |
57 | } |
58 | ||
7a4473a3 PNA |
59 | static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt, |
60 | struct sk_buff *skb) | |
beac5afa PNA |
61 | { |
62 | pkt->tprot_set = false; | |
63 | pkt->tprot = 0; | |
64 | pkt->xt.thoff = 0; | |
65 | pkt->xt.fragoff = 0; | |
66 | } | |
67 | ||
a55e22e9 PM |
68 | /** |
69 | * struct nft_verdict - nf_tables verdict | |
70 | * | |
71 | * @code: nf_tables/netfilter verdict code | |
72 | * @chain: destination chain for NFT_JUMP/NFT_GOTO | |
73 | */ | |
74 | struct nft_verdict { | |
75 | u32 code; | |
76 | struct nft_chain *chain; | |
77 | }; | |
78 | ||
96518518 PM |
79 | struct nft_data { |
80 | union { | |
1ca2e170 PM |
81 | u32 data[4]; |
82 | struct nft_verdict verdict; | |
96518518 PM |
83 | }; |
84 | } __attribute__((aligned(__alignof__(u64)))); | |
85 | ||
a55e22e9 PM |
86 | /** |
87 | * struct nft_regs - nf_tables register set | |
88 | * | |
89 | * @data: data registers | |
90 | * @verdict: verdict register | |
91 | * | |
92 | * The first four data registers alias to the verdict register. | |
93 | */ | |
94 | struct nft_regs { | |
95 | union { | |
49499c3e | 96 | u32 data[20]; |
a55e22e9 PM |
97 | struct nft_verdict verdict; |
98 | }; | |
99 | }; | |
100 | ||
10596608 LZ |
101 | /* Store/load an u16 or u8 integer to/from the u32 data register. |
102 | * | |
103 | * Note, when using concatenations, register allocation happens at 32-bit | |
104 | * level. So for store instruction, pad the rest part with zero to avoid | |
105 | * garbage values. | |
106 | */ | |
107 | ||
108 | static inline void nft_reg_store16(u32 *dreg, u16 val) | |
109 | { | |
110 | *dreg = 0; | |
111 | *(u16 *)dreg = val; | |
112 | } | |
113 | ||
114 | static inline void nft_reg_store8(u32 *dreg, u8 val) | |
115 | { | |
116 | *dreg = 0; | |
117 | *(u8 *)dreg = val; | |
118 | } | |
119 | ||
120 | static inline u16 nft_reg_load16(u32 *sreg) | |
121 | { | |
122 | return *(u16 *)sreg; | |
123 | } | |
124 | ||
125 | static inline u8 nft_reg_load8(u32 *sreg) | |
126 | { | |
127 | return *(u8 *)sreg; | |
128 | } | |
129 | ||
49499c3e PM |
130 | static inline void nft_data_copy(u32 *dst, const struct nft_data *src, |
131 | unsigned int len) | |
96518518 | 132 | { |
49499c3e | 133 | memcpy(dst, src, len); |
96518518 PM |
134 | } |
135 | ||
136 | static inline void nft_data_debug(const struct nft_data *data) | |
137 | { | |
138 | pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n", | |
139 | data->data[0], data->data[1], | |
140 | data->data[2], data->data[3]); | |
141 | } | |
142 | ||
143 | /** | |
20a69341 | 144 | * struct nft_ctx - nf_tables rule/set context |
96518518 | 145 | * |
99633ab2 | 146 | * @net: net namespace |
96518518 PM |
147 | * @table: the table the chain is contained in |
148 | * @chain: the chain the rule is contained in | |
0ca743a5 | 149 | * @nla: netlink attributes |
128ad332 PNA |
150 | * @portid: netlink portID of the original message |
151 | * @seq: netlink sequence number | |
36596dad | 152 | * @family: protocol family |
26b2f552 | 153 | * @level: depth of the chains |
128ad332 | 154 | * @report: notify via unicast netlink message |
96518518 PM |
155 | */ |
156 | struct nft_ctx { | |
99633ab2 | 157 | struct net *net; |
7c95f6d8 PNA |
158 | struct nft_table *table; |
159 | struct nft_chain *chain; | |
0ca743a5 | 160 | const struct nlattr * const *nla; |
128ad332 PNA |
161 | u32 portid; |
162 | u32 seq; | |
36596dad | 163 | u8 family; |
26b2f552 | 164 | u8 level; |
128ad332 | 165 | bool report; |
96518518 PM |
166 | }; |
167 | ||
96518518 PM |
168 | struct nft_data_desc { |
169 | enum nft_data_types type; | |
170 | unsigned int len; | |
171 | }; | |
172 | ||
d0a11fc3 PM |
173 | int nft_data_init(const struct nft_ctx *ctx, |
174 | struct nft_data *data, unsigned int size, | |
5eccdfaa | 175 | struct nft_data_desc *desc, const struct nlattr *nla); |
bb7b40ae | 176 | void nft_data_hold(const struct nft_data *data, enum nft_data_types type); |
59105446 | 177 | void nft_data_release(const struct nft_data *data, enum nft_data_types type); |
5eccdfaa JP |
178 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, |
179 | enum nft_data_types type, unsigned int len); | |
96518518 PM |
180 | |
181 | static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) | |
182 | { | |
183 | return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; | |
184 | } | |
185 | ||
20a69341 PM |
186 | static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) |
187 | { | |
bf798657 | 188 | return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; |
20a69341 PM |
189 | } |
190 | ||
f1d505bb | 191 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); |
b1c96ed3 PM |
192 | unsigned int nft_parse_register(const struct nlattr *attr); |
193 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); | |
194 | ||
d07db988 | 195 | int nft_validate_register_load(enum nft_registers reg, unsigned int len); |
1ec10212 PM |
196 | int nft_validate_register_store(const struct nft_ctx *ctx, |
197 | enum nft_registers reg, | |
198 | const struct nft_data *data, | |
199 | enum nft_data_types type, unsigned int len); | |
96518518 | 200 | |
86f1ec32 PM |
201 | /** |
202 | * struct nft_userdata - user defined data associated with an object | |
203 | * | |
204 | * @len: length of the data | |
205 | * @data: content | |
206 | * | |
207 | * The presence of user data is indicated in an object specific fashion, | |
208 | * so a length of zero can't occur and the value "len" indicates data | |
209 | * of length len + 1. | |
210 | */ | |
211 | struct nft_userdata { | |
212 | u8 len; | |
213 | unsigned char data[0]; | |
214 | }; | |
215 | ||
20a69341 PM |
216 | /** |
217 | * struct nft_set_elem - generic representation of set elements | |
218 | * | |
20a69341 | 219 | * @key: element key |
fe2811eb | 220 | * @priv: element private data and extensions |
20a69341 PM |
221 | */ |
222 | struct nft_set_elem { | |
7d740264 PM |
223 | union { |
224 | u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; | |
225 | struct nft_data val; | |
226 | } key; | |
fe2811eb | 227 | void *priv; |
20a69341 PM |
228 | }; |
229 | ||
230 | struct nft_set; | |
231 | struct nft_set_iter { | |
8588ac09 | 232 | u8 genmask; |
20a69341 PM |
233 | unsigned int count; |
234 | unsigned int skip; | |
235 | int err; | |
236 | int (*fn)(const struct nft_ctx *ctx, | |
de70185d | 237 | struct nft_set *set, |
20a69341 | 238 | const struct nft_set_iter *iter, |
de70185d | 239 | struct nft_set_elem *elem); |
20a69341 PM |
240 | }; |
241 | ||
c50b960c PM |
242 | /** |
243 | * struct nft_set_desc - description of set elements | |
244 | * | |
245 | * @klen: key length | |
246 | * @dlen: data length | |
247 | * @size: number of set elements | |
248 | */ | |
249 | struct nft_set_desc { | |
250 | unsigned int klen; | |
251 | unsigned int dlen; | |
252 | unsigned int size; | |
253 | }; | |
254 | ||
255 | /** | |
256 | * enum nft_set_class - performance class | |
257 | * | |
258 | * @NFT_LOOKUP_O_1: constant, O(1) | |
259 | * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) | |
260 | * @NFT_LOOKUP_O_N: linear, O(N) | |
261 | */ | |
262 | enum nft_set_class { | |
263 | NFT_SET_CLASS_O_1, | |
264 | NFT_SET_CLASS_O_LOG_N, | |
265 | NFT_SET_CLASS_O_N, | |
266 | }; | |
267 | ||
268 | /** | |
269 | * struct nft_set_estimate - estimation of memory and performance | |
270 | * characteristics | |
271 | * | |
272 | * @size: required memory | |
55af753c | 273 | * @lookup: lookup performance class |
0b5a7874 | 274 | * @space: memory class |
c50b960c PM |
275 | */ |
276 | struct nft_set_estimate { | |
4ef360dd | 277 | u64 size; |
55af753c | 278 | enum nft_set_class lookup; |
0b5a7874 | 279 | enum nft_set_class space; |
c50b960c PM |
280 | }; |
281 | ||
b2832dd6 | 282 | struct nft_set_ext; |
22fe54d5 | 283 | struct nft_expr; |
b2832dd6 | 284 | |
20a69341 PM |
285 | /** |
286 | * struct nft_set_ops - nf_tables set operations | |
287 | * | |
288 | * @lookup: look up an element within the set | |
289 | * @insert: insert new element into set | |
cc02e457 | 290 | * @activate: activate new element in the next generation |
8411b644 | 291 | * @deactivate: lookup for element and deactivate it in the next generation |
1ba1c414 | 292 | * @flush: deactivate element in the next generation |
20a69341 PM |
293 | * @remove: remove element from set |
294 | * @walk: iterate over all set elemeennts | |
ba0e4d99 | 295 | * @get: get set elements |
20a69341 PM |
296 | * @privsize: function to return size of set private data |
297 | * @init: initialize private data of new set instance | |
298 | * @destroy: destroy private data of set instance | |
fe2811eb | 299 | * @elemsize: element private size |
20a69341 PM |
300 | */ |
301 | struct nft_set_ops { | |
42a55769 PNA |
302 | bool (*lookup)(const struct net *net, |
303 | const struct nft_set *set, | |
8cd8937a | 304 | const u32 *key, |
b2832dd6 | 305 | const struct nft_set_ext **ext); |
22fe54d5 | 306 | bool (*update)(struct nft_set *set, |
8cd8937a | 307 | const u32 *key, |
22fe54d5 PM |
308 | void *(*new)(struct nft_set *, |
309 | const struct nft_expr *, | |
a55e22e9 | 310 | struct nft_regs *), |
22fe54d5 | 311 | const struct nft_expr *expr, |
a55e22e9 | 312 | struct nft_regs *regs, |
22fe54d5 PM |
313 | const struct nft_set_ext **ext); |
314 | ||
42a55769 PNA |
315 | int (*insert)(const struct net *net, |
316 | const struct nft_set *set, | |
c016c7e4 PNA |
317 | const struct nft_set_elem *elem, |
318 | struct nft_set_ext **ext); | |
42a55769 PNA |
319 | void (*activate)(const struct net *net, |
320 | const struct nft_set *set, | |
cc02e457 | 321 | const struct nft_set_elem *elem); |
42a55769 PNA |
322 | void * (*deactivate)(const struct net *net, |
323 | const struct nft_set *set, | |
cc02e457 | 324 | const struct nft_set_elem *elem); |
1ba1c414 PNA |
325 | bool (*flush)(const struct net *net, |
326 | const struct nft_set *set, | |
327 | void *priv); | |
5cb82a38 PNA |
328 | void (*remove)(const struct net *net, |
329 | const struct nft_set *set, | |
20a69341 PM |
330 | const struct nft_set_elem *elem); |
331 | void (*walk)(const struct nft_ctx *ctx, | |
de70185d | 332 | struct nft_set *set, |
20a69341 | 333 | struct nft_set_iter *iter); |
ba0e4d99 PNA |
334 | void * (*get)(const struct net *net, |
335 | const struct nft_set *set, | |
336 | const struct nft_set_elem *elem, | |
337 | unsigned int flags); | |
20a69341 | 338 | |
4ef360dd | 339 | u64 (*privsize)(const struct nlattr * const nla[], |
347b408d | 340 | const struct nft_set_desc *desc); |
c50b960c PM |
341 | bool (*estimate)(const struct nft_set_desc *desc, |
342 | u32 features, | |
343 | struct nft_set_estimate *est); | |
20a69341 | 344 | int (*init)(const struct nft_set *set, |
c50b960c | 345 | const struct nft_set_desc *desc, |
20a69341 PM |
346 | const struct nlattr * const nla[]); |
347 | void (*destroy)(const struct nft_set *set); | |
79b174ad | 348 | void (*gc_init)(const struct nft_set *set); |
20a69341 | 349 | |
fe2811eb | 350 | unsigned int elemsize; |
71cc0873 PS |
351 | }; |
352 | ||
353 | /** | |
354 | * struct nft_set_type - nf_tables set type | |
355 | * | |
356 | * @ops: set ops for this type | |
357 | * @list: used internally | |
358 | * @owner: module reference | |
359 | * @features: features supported by the implementation | |
360 | */ | |
361 | struct nft_set_type { | |
362 | const struct nft_set_ops ops; | |
363 | struct list_head list; | |
364 | struct module *owner; | |
20a69341 PM |
365 | u32 features; |
366 | }; | |
71cc0873 | 367 | #define to_set_type(o) container_of(o, struct nft_set_type, ops) |
20a69341 | 368 | |
2b664957 PNA |
369 | int nft_register_set(struct nft_set_type *type); |
370 | void nft_unregister_set(struct nft_set_type *type); | |
20a69341 PM |
371 | |
372 | /** | |
373 | * struct nft_set - nf_tables set instance | |
374 | * | |
375 | * @list: table set list node | |
376 | * @bindings: list of set bindings | |
3453c927 PNA |
377 | * @table: table this set belongs to |
378 | * @net: netnamespace this set belongs to | |
20a69341 | 379 | * @name: name of the set |
3ecbfd65 | 380 | * @handle: unique handle of the set |
20a69341 PM |
381 | * @ktype: key type (numeric type defined by userspace, not used in the kernel) |
382 | * @dtype: data type (verdict or numeric type defined by userspace) | |
8aeff920 | 383 | * @objtype: object type (see NFT_OBJECT_* definitions) |
c50b960c PM |
384 | * @size: maximum set size |
385 | * @nelems: number of elements | |
3dd0673a | 386 | * @ndeact: number of deactivated elements queued for removal |
d3e2a111 | 387 | * @timeout: default timeout value in jiffies |
761da293 | 388 | * @gc_int: garbage collection interval in msecs |
9363dc4b | 389 | * @policy: set parameterization (see enum nft_set_policies) |
e6d8ecac CFG |
390 | * @udlen: user data length |
391 | * @udata: user data | |
20a69341 PM |
392 | * @ops: set ops |
393 | * @flags: set flags | |
37a9cc52 | 394 | * @genmask: generation mask |
20a69341 PM |
395 | * @klen: key length |
396 | * @dlen: data length | |
397 | * @data: private set data | |
398 | */ | |
399 | struct nft_set { | |
400 | struct list_head list; | |
401 | struct list_head bindings; | |
3453c927 PNA |
402 | struct nft_table *table; |
403 | possible_net_t net; | |
38745490 | 404 | char *name; |
3ecbfd65 | 405 | u64 handle; |
20a69341 PM |
406 | u32 ktype; |
407 | u32 dtype; | |
8aeff920 | 408 | u32 objtype; |
c50b960c | 409 | u32 size; |
3dd0673a PM |
410 | atomic_t nelems; |
411 | u32 ndeact; | |
761da293 PM |
412 | u64 timeout; |
413 | u32 gc_int; | |
9363dc4b | 414 | u16 policy; |
e6d8ecac CFG |
415 | u16 udlen; |
416 | unsigned char *udata; | |
20a69341 PM |
417 | /* runtime data below here */ |
418 | const struct nft_set_ops *ops ____cacheline_aligned; | |
37a9cc52 PNA |
419 | u16 flags:14, |
420 | genmask:2; | |
20a69341 PM |
421 | u8 klen; |
422 | u8 dlen; | |
423 | unsigned char data[] | |
424 | __attribute__((aligned(__alignof__(u64)))); | |
425 | }; | |
426 | ||
408070d6 PNA |
427 | static inline bool nft_set_is_anonymous(const struct nft_set *set) |
428 | { | |
429 | return set->flags & NFT_SET_ANONYMOUS; | |
430 | } | |
431 | ||
20a69341 PM |
432 | static inline void *nft_set_priv(const struct nft_set *set) |
433 | { | |
434 | return (void *)set->data; | |
435 | } | |
436 | ||
9d098292 PM |
437 | static inline struct nft_set *nft_set_container_of(const void *priv) |
438 | { | |
439 | return (void *)priv - offsetof(struct nft_set, data); | |
440 | } | |
441 | ||
10659cba PNA |
442 | struct nft_set *nft_set_lookup_global(const struct net *net, |
443 | const struct nft_table *table, | |
444 | const struct nlattr *nla_set_name, | |
445 | const struct nlattr *nla_set_id, | |
446 | u8 genmask); | |
20a69341 | 447 | |
761da293 PM |
448 | static inline unsigned long nft_set_gc_interval(const struct nft_set *set) |
449 | { | |
450 | return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ; | |
451 | } | |
452 | ||
20a69341 PM |
453 | /** |
454 | * struct nft_set_binding - nf_tables set binding | |
455 | * | |
456 | * @list: set bindings list node | |
457 | * @chain: chain containing the rule bound to the set | |
11113e19 | 458 | * @flags: set action flags |
20a69341 PM |
459 | * |
460 | * A set binding contains all information necessary for validation | |
461 | * of new elements added to a bound set. | |
462 | */ | |
463 | struct nft_set_binding { | |
464 | struct list_head list; | |
465 | const struct nft_chain *chain; | |
11113e19 | 466 | u32 flags; |
20a69341 PM |
467 | }; |
468 | ||
5eccdfaa JP |
469 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, |
470 | struct nft_set_binding *binding); | |
471 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
472 | struct nft_set_binding *binding); | |
cd5125d8 FW |
473 | void nf_tables_rebind_set(const struct nft_ctx *ctx, struct nft_set *set, |
474 | struct nft_set_binding *binding); | |
475 | void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set); | |
20a69341 | 476 | |
3ac4c07a PM |
477 | /** |
478 | * enum nft_set_extensions - set extension type IDs | |
479 | * | |
480 | * @NFT_SET_EXT_KEY: element key | |
481 | * @NFT_SET_EXT_DATA: mapping data | |
482 | * @NFT_SET_EXT_FLAGS: element flags | |
c3e1b005 PM |
483 | * @NFT_SET_EXT_TIMEOUT: element timeout |
484 | * @NFT_SET_EXT_EXPIRATION: element expiration time | |
68e942e8 | 485 | * @NFT_SET_EXT_USERDATA: user data associated with the element |
f25ad2e9 | 486 | * @NFT_SET_EXT_EXPR: expression assiociated with the element |
8aeff920 | 487 | * @NFT_SET_EXT_OBJREF: stateful object reference associated with element |
3ac4c07a PM |
488 | * @NFT_SET_EXT_NUM: number of extension types |
489 | */ | |
490 | enum nft_set_extensions { | |
491 | NFT_SET_EXT_KEY, | |
492 | NFT_SET_EXT_DATA, | |
493 | NFT_SET_EXT_FLAGS, | |
c3e1b005 PM |
494 | NFT_SET_EXT_TIMEOUT, |
495 | NFT_SET_EXT_EXPIRATION, | |
68e942e8 | 496 | NFT_SET_EXT_USERDATA, |
f25ad2e9 | 497 | NFT_SET_EXT_EXPR, |
8aeff920 | 498 | NFT_SET_EXT_OBJREF, |
3ac4c07a PM |
499 | NFT_SET_EXT_NUM |
500 | }; | |
501 | ||
502 | /** | |
503 | * struct nft_set_ext_type - set extension type | |
504 | * | |
505 | * @len: fixed part length of the extension | |
506 | * @align: alignment requirements of the extension | |
507 | */ | |
508 | struct nft_set_ext_type { | |
509 | u8 len; | |
510 | u8 align; | |
511 | }; | |
512 | ||
513 | extern const struct nft_set_ext_type nft_set_ext_types[]; | |
514 | ||
515 | /** | |
516 | * struct nft_set_ext_tmpl - set extension template | |
517 | * | |
518 | * @len: length of extension area | |
519 | * @offset: offsets of individual extension types | |
520 | */ | |
521 | struct nft_set_ext_tmpl { | |
522 | u16 len; | |
523 | u8 offset[NFT_SET_EXT_NUM]; | |
524 | }; | |
525 | ||
526 | /** | |
527 | * struct nft_set_ext - set extensions | |
528 | * | |
cc02e457 | 529 | * @genmask: generation mask |
3ac4c07a PM |
530 | * @offset: offsets of individual extension types |
531 | * @data: beginning of extension data | |
532 | */ | |
533 | struct nft_set_ext { | |
cc02e457 | 534 | u8 genmask; |
3ac4c07a PM |
535 | u8 offset[NFT_SET_EXT_NUM]; |
536 | char data[0]; | |
537 | }; | |
538 | ||
539 | static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) | |
540 | { | |
541 | memset(tmpl, 0, sizeof(*tmpl)); | |
542 | tmpl->len = sizeof(struct nft_set_ext); | |
543 | } | |
544 | ||
545 | static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, | |
546 | unsigned int len) | |
547 | { | |
548 | tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); | |
549 | BUG_ON(tmpl->len > U8_MAX); | |
550 | tmpl->offset[id] = tmpl->len; | |
551 | tmpl->len += nft_set_ext_types[id].len + len; | |
552 | } | |
553 | ||
554 | static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) | |
555 | { | |
556 | nft_set_ext_add_length(tmpl, id, 0); | |
557 | } | |
558 | ||
559 | static inline void nft_set_ext_init(struct nft_set_ext *ext, | |
560 | const struct nft_set_ext_tmpl *tmpl) | |
561 | { | |
562 | memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); | |
563 | } | |
564 | ||
565 | static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) | |
566 | { | |
567 | return !!ext->offset[id]; | |
568 | } | |
569 | ||
570 | static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) | |
571 | { | |
572 | return ext && __nft_set_ext_exists(ext, id); | |
573 | } | |
574 | ||
575 | static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) | |
576 | { | |
577 | return (void *)ext + ext->offset[id]; | |
578 | } | |
579 | ||
580 | static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) | |
581 | { | |
582 | return nft_set_ext(ext, NFT_SET_EXT_KEY); | |
583 | } | |
584 | ||
585 | static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) | |
586 | { | |
587 | return nft_set_ext(ext, NFT_SET_EXT_DATA); | |
588 | } | |
589 | ||
590 | static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) | |
591 | { | |
592 | return nft_set_ext(ext, NFT_SET_EXT_FLAGS); | |
593 | } | |
ef1f7df9 | 594 | |
c3e1b005 PM |
595 | static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) |
596 | { | |
597 | return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); | |
598 | } | |
599 | ||
8e1102d5 | 600 | static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) |
c3e1b005 PM |
601 | { |
602 | return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); | |
603 | } | |
604 | ||
68e942e8 PM |
605 | static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) |
606 | { | |
607 | return nft_set_ext(ext, NFT_SET_EXT_USERDATA); | |
608 | } | |
609 | ||
f25ad2e9 PM |
610 | static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext) |
611 | { | |
612 | return nft_set_ext(ext, NFT_SET_EXT_EXPR); | |
613 | } | |
614 | ||
c3e1b005 PM |
615 | static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) |
616 | { | |
617 | return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && | |
8e1102d5 | 618 | time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext)); |
c3e1b005 PM |
619 | } |
620 | ||
fe2811eb PM |
621 | static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, |
622 | void *elem) | |
623 | { | |
624 | return elem + set->ops->elemsize; | |
625 | } | |
626 | ||
8aeff920 PNA |
627 | static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) |
628 | { | |
629 | return nft_set_ext(ext, NFT_SET_EXT_OBJREF); | |
630 | } | |
631 | ||
22fe54d5 PM |
632 | void *nft_set_elem_init(const struct nft_set *set, |
633 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 634 | const u32 *key, const u32 *data, |
22fe54d5 | 635 | u64 timeout, gfp_t gfp); |
61f9e292 LZ |
636 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
637 | bool destroy_expr); | |
61edafbb | 638 | |
cfed7e1b PM |
639 | /** |
640 | * struct nft_set_gc_batch_head - nf_tables set garbage collection batch | |
641 | * | |
642 | * @rcu: rcu head | |
643 | * @set: set the elements belong to | |
644 | * @cnt: count of elements | |
645 | */ | |
646 | struct nft_set_gc_batch_head { | |
647 | struct rcu_head rcu; | |
648 | const struct nft_set *set; | |
649 | unsigned int cnt; | |
650 | }; | |
651 | ||
652 | #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ | |
653 | sizeof(struct nft_set_gc_batch_head)) / \ | |
654 | sizeof(void *)) | |
655 | ||
656 | /** | |
657 | * struct nft_set_gc_batch - nf_tables set garbage collection batch | |
658 | * | |
659 | * @head: GC batch head | |
660 | * @elems: garbage collection elements | |
661 | */ | |
662 | struct nft_set_gc_batch { | |
663 | struct nft_set_gc_batch_head head; | |
664 | void *elems[NFT_SET_GC_BATCH_SIZE]; | |
665 | }; | |
666 | ||
667 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
668 | gfp_t gfp); | |
669 | void nft_set_gc_batch_release(struct rcu_head *rcu); | |
670 | ||
671 | static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) | |
672 | { | |
673 | if (gcb != NULL) | |
674 | call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); | |
675 | } | |
676 | ||
677 | static inline struct nft_set_gc_batch * | |
678 | nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, | |
679 | gfp_t gfp) | |
680 | { | |
681 | if (gcb != NULL) { | |
682 | if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) | |
683 | return gcb; | |
684 | nft_set_gc_batch_complete(gcb); | |
685 | } | |
686 | return nft_set_gc_batch_alloc(set, gfp); | |
687 | } | |
688 | ||
689 | static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, | |
690 | void *elem) | |
691 | { | |
692 | gcb->elems[gcb->head.cnt++] = elem; | |
693 | } | |
694 | ||
96518518 | 695 | /** |
ef1f7df9 | 696 | * struct nft_expr_type - nf_tables expression type |
96518518 | 697 | * |
ef1f7df9 PM |
698 | * @select_ops: function to select nft_expr_ops |
699 | * @ops: default ops, used when no select_ops functions is present | |
96518518 PM |
700 | * @list: used internally |
701 | * @name: Identifier | |
702 | * @owner: module reference | |
703 | * @policy: netlink attribute policy | |
704 | * @maxattr: highest netlink attribute number | |
64d46806 | 705 | * @family: address family for AF-specific types |
151d799a | 706 | * @flags: expression type flags |
ef1f7df9 PM |
707 | */ |
708 | struct nft_expr_type { | |
0ca743a5 PNA |
709 | const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, |
710 | const struct nlattr * const tb[]); | |
ef1f7df9 PM |
711 | const struct nft_expr_ops *ops; |
712 | struct list_head list; | |
713 | const char *name; | |
714 | struct module *owner; | |
715 | const struct nla_policy *policy; | |
716 | unsigned int maxattr; | |
64d46806 | 717 | u8 family; |
151d799a | 718 | u8 flags; |
ef1f7df9 PM |
719 | }; |
720 | ||
151d799a | 721 | #define NFT_EXPR_STATEFUL 0x1 |
79b174ad | 722 | #define NFT_EXPR_GC 0x2 |
151d799a | 723 | |
ef1f7df9 PM |
724 | /** |
725 | * struct nft_expr_ops - nf_tables expression operations | |
726 | * | |
727 | * @eval: Expression evaluation function | |
96518518 | 728 | * @size: full expression size, including private data size |
ef1f7df9 | 729 | * @init: initialization function |
cd5125d8 FW |
730 | * @activate: activate expression in the next generation |
731 | * @deactivate: deactivate expression in next generation | |
732 | * @destroy: destruction function, called after synchronize_rcu | |
ef1f7df9 PM |
733 | * @dump: function to dump parameters |
734 | * @type: expression type | |
0ca743a5 PNA |
735 | * @validate: validate expression, called during loop detection |
736 | * @data: extra data to attach to this expression operation | |
96518518 PM |
737 | */ |
738 | struct nft_expr; | |
739 | struct nft_expr_ops { | |
740 | void (*eval)(const struct nft_expr *expr, | |
a55e22e9 | 741 | struct nft_regs *regs, |
96518518 | 742 | const struct nft_pktinfo *pkt); |
086f3321 PNA |
743 | int (*clone)(struct nft_expr *dst, |
744 | const struct nft_expr *src); | |
ef1f7df9 PM |
745 | unsigned int size; |
746 | ||
96518518 PM |
747 | int (*init)(const struct nft_ctx *ctx, |
748 | const struct nft_expr *expr, | |
749 | const struct nlattr * const tb[]); | |
bb7b40ae PNA |
750 | void (*activate)(const struct nft_ctx *ctx, |
751 | const struct nft_expr *expr); | |
752 | void (*deactivate)(const struct nft_ctx *ctx, | |
753 | const struct nft_expr *expr); | |
62472bce PM |
754 | void (*destroy)(const struct nft_ctx *ctx, |
755 | const struct nft_expr *expr); | |
371ebcbb PNA |
756 | void (*destroy_clone)(const struct nft_ctx *ctx, |
757 | const struct nft_expr *expr); | |
96518518 PM |
758 | int (*dump)(struct sk_buff *skb, |
759 | const struct nft_expr *expr); | |
0ca743a5 PNA |
760 | int (*validate)(const struct nft_ctx *ctx, |
761 | const struct nft_expr *expr, | |
762 | const struct nft_data **data); | |
79b174ad PNA |
763 | bool (*gc)(struct net *net, |
764 | const struct nft_expr *expr); | |
ef1f7df9 | 765 | const struct nft_expr_type *type; |
0ca743a5 | 766 | void *data; |
96518518 PM |
767 | }; |
768 | ||
ef1f7df9 | 769 | #define NFT_EXPR_MAXATTR 16 |
96518518 PM |
770 | #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ |
771 | ALIGN(size, __alignof__(struct nft_expr))) | |
772 | ||
773 | /** | |
774 | * struct nft_expr - nf_tables expression | |
775 | * | |
776 | * @ops: expression ops | |
777 | * @data: expression private data | |
778 | */ | |
779 | struct nft_expr { | |
780 | const struct nft_expr_ops *ops; | |
781 | unsigned char data[]; | |
782 | }; | |
783 | ||
784 | static inline void *nft_expr_priv(const struct nft_expr *expr) | |
785 | { | |
786 | return (void *)expr->data; | |
787 | } | |
788 | ||
0b2d8a7b PM |
789 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
790 | const struct nlattr *nla); | |
791 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); | |
792 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, | |
793 | const struct nft_expr *expr); | |
794 | ||
086f3321 | 795 | static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) |
0b2d8a7b | 796 | { |
086f3321 PNA |
797 | int err; |
798 | ||
086f3321 PNA |
799 | if (src->ops->clone) { |
800 | dst->ops = src->ops; | |
801 | err = src->ops->clone(dst, src); | |
802 | if (err < 0) | |
803 | return err; | |
804 | } else { | |
805 | memcpy(dst, src, src->ops->size); | |
806 | } | |
61f9e292 LZ |
807 | |
808 | __module_get(src->ops->type->owner); | |
086f3321 | 809 | return 0; |
0b2d8a7b PM |
810 | } |
811 | ||
96518518 PM |
812 | /** |
813 | * struct nft_rule - nf_tables rule | |
814 | * | |
815 | * @list: used internally | |
96518518 | 816 | * @handle: rule handle |
0628b123 | 817 | * @genmask: generation mask |
96518518 | 818 | * @dlen: length of expression data |
86f1ec32 | 819 | * @udata: user data is appended to the rule |
96518518 PM |
820 | * @data: expression data |
821 | */ | |
822 | struct nft_rule { | |
823 | struct list_head list; | |
0768b3b3 | 824 | u64 handle:42, |
0628b123 | 825 | genmask:2, |
0768b3b3 | 826 | dlen:12, |
86f1ec32 | 827 | udata:1; |
96518518 PM |
828 | unsigned char data[] |
829 | __attribute__((aligned(__alignof__(struct nft_expr)))); | |
830 | }; | |
831 | ||
832 | static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) | |
833 | { | |
834 | return (struct nft_expr *)&rule->data[0]; | |
835 | } | |
836 | ||
837 | static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) | |
838 | { | |
839 | return ((void *)expr) + expr->ops->size; | |
840 | } | |
841 | ||
842 | static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) | |
843 | { | |
844 | return (struct nft_expr *)&rule->data[rule->dlen]; | |
845 | } | |
846 | ||
86f1ec32 | 847 | static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) |
0768b3b3 PNA |
848 | { |
849 | return (void *)&rule->data[rule->dlen]; | |
850 | } | |
851 | ||
96518518 PM |
852 | /* |
853 | * The last pointer isn't really necessary, but the compiler isn't able to | |
854 | * determine that the result of nft_expr_last() is always the same since it | |
855 | * can't assume that the dlen value wasn't changed within calls in the loop. | |
856 | */ | |
857 | #define nft_rule_for_each_expr(expr, last, rule) \ | |
858 | for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ | |
859 | (expr) != (last); \ | |
860 | (expr) = nft_expr_next(expr)) | |
861 | ||
862 | enum nft_chain_flags { | |
863 | NFT_BASE_CHAIN = 0x1, | |
96518518 PM |
864 | }; |
865 | ||
866 | /** | |
867 | * struct nft_chain - nf_tables chain | |
868 | * | |
869 | * @rules: list of rules in the chain | |
870 | * @list: used internally | |
1b2470e5 | 871 | * @rhlhead: used internally |
b5bc89bf | 872 | * @table: table that this chain belongs to |
96518518 | 873 | * @handle: chain handle |
96518518 | 874 | * @use: number of jump references to this chain |
a0a7379e | 875 | * @flags: bitmask of enum nft_chain_flags |
96518518 PM |
876 | * @name: name of the chain |
877 | */ | |
878 | struct nft_chain { | |
0cbc06b3 FW |
879 | struct nft_rule *__rcu *rules_gen_0; |
880 | struct nft_rule *__rcu *rules_gen_1; | |
96518518 PM |
881 | struct list_head rules; |
882 | struct list_head list; | |
1b2470e5 | 883 | struct rhlist_head rhlhead; |
b5bc89bf | 884 | struct nft_table *table; |
96518518 | 885 | u64 handle; |
a0a7379e | 886 | u32 use; |
664b0f8c PNA |
887 | u8 flags:6, |
888 | genmask:2; | |
b7263e07 | 889 | char *name; |
0cbc06b3 FW |
890 | |
891 | /* Only used during control plane commit phase: */ | |
892 | struct nft_rule **rules_next; | |
96518518 PM |
893 | }; |
894 | ||
a654de8f PNA |
895 | int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); |
896 | ||
32537e91 | 897 | enum nft_chain_types { |
9370761c PNA |
898 | NFT_CHAIN_T_DEFAULT = 0, |
899 | NFT_CHAIN_T_ROUTE, | |
900 | NFT_CHAIN_T_NAT, | |
901 | NFT_CHAIN_T_MAX | |
902 | }; | |
903 | ||
1a1e1a12 | 904 | /** |
32537e91 | 905 | * struct nft_chain_type - nf_tables chain type info |
1a1e1a12 PM |
906 | * |
907 | * @name: name of the type | |
908 | * @type: numeric identifier | |
909 | * @family: address family | |
910 | * @owner: module owner | |
911 | * @hook_mask: mask of valid hooks | |
c2f9eafe | 912 | * @hooks: array of hook functions |
4e25ceb8 FW |
913 | * @ops_register: base chain register function |
914 | * @ops_unregister: base chain unregister function | |
1a1e1a12 | 915 | */ |
32537e91 | 916 | struct nft_chain_type { |
1a1e1a12 | 917 | const char *name; |
32537e91 | 918 | enum nft_chain_types type; |
1a1e1a12 PM |
919 | int family; |
920 | struct module *owner; | |
921 | unsigned int hook_mask; | |
922 | nf_hookfn *hooks[NF_MAX_HOOKS]; | |
4e25ceb8 FW |
923 | int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); |
924 | void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); | |
1a1e1a12 PM |
925 | }; |
926 | ||
7210e4e3 | 927 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
32537e91 | 928 | enum nft_chain_types type); |
75e8d06d PNA |
929 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
930 | unsigned int hook_flags); | |
7210e4e3 | 931 | |
0ca743a5 | 932 | struct nft_stats { |
ce355e20 ED |
933 | u64 bytes; |
934 | u64 pkts; | |
935 | struct u64_stats_sync syncp; | |
0ca743a5 PNA |
936 | }; |
937 | ||
96518518 PM |
938 | /** |
939 | * struct nft_base_chain - nf_tables base chain | |
940 | * | |
941 | * @ops: netfilter hook ops | |
9370761c | 942 | * @type: chain type |
0ca743a5 PNA |
943 | * @policy: default policy |
944 | * @stats: per-cpu chain stats | |
96518518 | 945 | * @chain: the chain |
2cbce139 | 946 | * @dev_name: device name that this base chain is attached to (if any) |
96518518 PM |
947 | */ |
948 | struct nft_base_chain { | |
c974a3a3 | 949 | struct nf_hook_ops ops; |
32537e91 | 950 | const struct nft_chain_type *type; |
0ca743a5 | 951 | u8 policy; |
835b8033 | 952 | u8 flags; |
0ca743a5 | 953 | struct nft_stats __percpu *stats; |
96518518 | 954 | struct nft_chain chain; |
2cbce139 | 955 | char dev_name[IFNAMSIZ]; |
96518518 PM |
956 | }; |
957 | ||
958 | static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) | |
959 | { | |
960 | return container_of(chain, struct nft_base_chain, chain); | |
961 | } | |
962 | ||
f323d954 PNA |
963 | static inline bool nft_is_base_chain(const struct nft_chain *chain) |
964 | { | |
965 | return chain->flags & NFT_BASE_CHAIN; | |
966 | } | |
967 | ||
5ebe0b0e | 968 | int __nft_release_basechain(struct nft_ctx *ctx); |
835b8033 | 969 | |
06198b34 | 970 | unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); |
96518518 | 971 | |
96518518 PM |
972 | /** |
973 | * struct nft_table - nf_tables table | |
974 | * | |
975 | * @list: used internally | |
1b2470e5 FW |
976 | * @chains_ht: chains in the table |
977 | * @chains: same, for stable walks | |
96518518 | 978 | * @sets: sets in the table |
e5009240 | 979 | * @objects: stateful objects in the table |
3b49e2e9 | 980 | * @flowtables: flow tables in the table |
96518518 | 981 | * @hgenerator: handle generator state |
3ecbfd65 | 982 | * @handle: table handle |
96518518 PM |
983 | * @use: number of chain references to this table |
984 | * @flags: table flag (see enum nft_table_flags) | |
f2a6d766 | 985 | * @genmask: generation mask |
36596dad | 986 | * @afinfo: address family info |
96518518 PM |
987 | * @name: name of the table |
988 | */ | |
989 | struct nft_table { | |
990 | struct list_head list; | |
1b2470e5 | 991 | struct rhltable chains_ht; |
96518518 PM |
992 | struct list_head chains; |
993 | struct list_head sets; | |
e5009240 | 994 | struct list_head objects; |
3b49e2e9 | 995 | struct list_head flowtables; |
96518518 | 996 | u64 hgenerator; |
3ecbfd65 | 997 | u64 handle; |
96518518 | 998 | u32 use; |
98319cb9 PNA |
999 | u16 family:6, |
1000 | flags:8, | |
f2a6d766 | 1001 | genmask:2; |
e46abbcc | 1002 | char *name; |
ebddf1a8 PNA |
1003 | }; |
1004 | ||
cc07eeb0 | 1005 | void nft_register_chain_type(const struct nft_chain_type *); |
32537e91 | 1006 | void nft_unregister_chain_type(const struct nft_chain_type *); |
96518518 | 1007 | |
5eccdfaa JP |
1008 | int nft_register_expr(struct nft_expr_type *); |
1009 | void nft_unregister_expr(struct nft_expr_type *); | |
96518518 | 1010 | |
33d5a7b1 FW |
1011 | int nft_verdict_dump(struct sk_buff *skb, int type, |
1012 | const struct nft_verdict *v); | |
1013 | ||
e5009240 PNA |
1014 | /** |
1015 | * struct nft_object - nf_tables stateful object | |
1016 | * | |
1017 | * @list: table stateful object list node | |
18965317 | 1018 | * @table: table this object belongs to |
e5009240 PNA |
1019 | * @name: name of this stateful object |
1020 | * @genmask: generation mask | |
1021 | * @use: number of references to this stateful object | |
3ecbfd65 | 1022 | * @handle: unique object handle |
dfc46034 | 1023 | * @ops: object operations |
3ecbfd65 | 1024 | * @data: object data, layout depends on type |
e5009240 PNA |
1025 | */ |
1026 | struct nft_object { | |
1027 | struct list_head list; | |
61509575 | 1028 | char *name; |
18965317 | 1029 | struct nft_table *table; |
e5009240 PNA |
1030 | u32 genmask:2, |
1031 | use:30; | |
3ecbfd65 | 1032 | u64 handle; |
e5009240 | 1033 | /* runtime data below here */ |
dfc46034 | 1034 | const struct nft_object_ops *ops ____cacheline_aligned; |
e5009240 PNA |
1035 | unsigned char data[] |
1036 | __attribute__((aligned(__alignof__(u64)))); | |
1037 | }; | |
1038 | ||
1039 | static inline void *nft_obj_data(const struct nft_object *obj) | |
1040 | { | |
1041 | return (void *)obj->data; | |
1042 | } | |
1043 | ||
1044 | #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) | |
1045 | ||
cac20fcd PNA |
1046 | struct nft_object *nft_obj_lookup(const struct nft_table *table, |
1047 | const struct nlattr *nla, u32 objtype, | |
1048 | u8 genmask); | |
e5009240 | 1049 | |
25e94a99 PNA |
1050 | void nft_obj_notify(struct net *net, struct nft_table *table, |
1051 | struct nft_object *obj, u32 portid, u32 seq, | |
1052 | int event, int family, int report, gfp_t gfp); | |
2599e989 | 1053 | |
e5009240 PNA |
1054 | /** |
1055 | * struct nft_object_type - stateful object type | |
1056 | * | |
dfc46034 PBG |
1057 | * @select_ops: function to select nft_object_ops |
1058 | * @ops: default ops, used when no select_ops functions is present | |
e5009240 PNA |
1059 | * @list: list node in list of object types |
1060 | * @type: stateful object numeric type | |
e5009240 PNA |
1061 | * @owner: module owner |
1062 | * @maxattr: maximum netlink attribute | |
1063 | * @policy: netlink attribute policy | |
dfc46034 PBG |
1064 | */ |
1065 | struct nft_object_type { | |
1066 | const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, | |
1067 | const struct nlattr * const tb[]); | |
1068 | const struct nft_object_ops *ops; | |
1069 | struct list_head list; | |
1070 | u32 type; | |
1071 | unsigned int maxattr; | |
1072 | struct module *owner; | |
1073 | const struct nla_policy *policy; | |
1074 | }; | |
1075 | ||
1076 | /** | |
1077 | * struct nft_object_ops - stateful object operations | |
1078 | * | |
1079 | * @eval: stateful object evaluation function | |
1080 | * @size: stateful object size | |
e5009240 PNA |
1081 | * @init: initialize object from netlink attributes |
1082 | * @destroy: release existing stateful object | |
1083 | * @dump: netlink dump stateful object | |
1084 | */ | |
dfc46034 | 1085 | struct nft_object_ops { |
e5009240 PNA |
1086 | void (*eval)(struct nft_object *obj, |
1087 | struct nft_regs *regs, | |
1088 | const struct nft_pktinfo *pkt); | |
e5009240 | 1089 | unsigned int size; |
84fba055 FW |
1090 | int (*init)(const struct nft_ctx *ctx, |
1091 | const struct nlattr *const tb[], | |
e5009240 | 1092 | struct nft_object *obj); |
00bfb320 PNA |
1093 | void (*destroy)(const struct nft_ctx *ctx, |
1094 | struct nft_object *obj); | |
e5009240 | 1095 | int (*dump)(struct sk_buff *skb, |
43da04a5 PNA |
1096 | struct nft_object *obj, |
1097 | bool reset); | |
dfc46034 | 1098 | const struct nft_object_type *type; |
e5009240 PNA |
1099 | }; |
1100 | ||
1101 | int nft_register_obj(struct nft_object_type *obj_type); | |
1102 | void nft_unregister_obj(struct nft_object_type *obj_type); | |
1103 | ||
d92191aa PNA |
1104 | #define NFT_FLOWTABLE_DEVICE_MAX 8 |
1105 | ||
3b49e2e9 PNA |
1106 | /** |
1107 | * struct nft_flowtable - nf_tables flow table | |
1108 | * | |
1109 | * @list: flow table list node in table list | |
1110 | * @table: the table the flow table is contained in | |
1111 | * @name: name of this flow table | |
1112 | * @hooknum: hook number | |
1113 | * @priority: hook priority | |
1114 | * @ops_len: number of hooks in array | |
1115 | * @genmask: generation mask | |
1116 | * @use: number of references to this flow table | |
3ecbfd65 | 1117 | * @handle: unique object handle |
d92191aa | 1118 | * @dev_name: array of device names |
3b49e2e9 PNA |
1119 | * @data: rhashtable and garbage collector |
1120 | * @ops: array of hooks | |
1121 | */ | |
1122 | struct nft_flowtable { | |
1123 | struct list_head list; | |
1124 | struct nft_table *table; | |
1125 | char *name; | |
1126 | int hooknum; | |
1127 | int priority; | |
1128 | int ops_len; | |
1129 | u32 genmask:2, | |
1130 | use:30; | |
3ecbfd65 | 1131 | u64 handle; |
3b49e2e9 PNA |
1132 | /* runtime data below here */ |
1133 | struct nf_hook_ops *ops ____cacheline_aligned; | |
1134 | struct nf_flowtable data; | |
1135 | }; | |
1136 | ||
cac20fcd PNA |
1137 | struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, |
1138 | const struct nlattr *nla, | |
1139 | u8 genmask); | |
3b49e2e9 PNA |
1140 | |
1141 | void nft_register_flowtable_type(struct nf_flowtable_type *type); | |
1142 | void nft_unregister_flowtable_type(struct nf_flowtable_type *type); | |
1143 | ||
33d5a7b1 FW |
1144 | /** |
1145 | * struct nft_traceinfo - nft tracing information and state | |
1146 | * | |
1147 | * @pkt: pktinfo currently processed | |
1148 | * @basechain: base chain currently processed | |
1149 | * @chain: chain currently processed | |
1150 | * @rule: rule that was evaluated | |
1151 | * @verdict: verdict given by rule | |
1152 | * @type: event type (enum nft_trace_types) | |
1153 | * @packet_dumped: packet headers sent in a previous traceinfo message | |
1154 | * @trace: other struct members are initialised | |
1155 | */ | |
1156 | struct nft_traceinfo { | |
1157 | const struct nft_pktinfo *pkt; | |
1158 | const struct nft_base_chain *basechain; | |
1159 | const struct nft_chain *chain; | |
1160 | const struct nft_rule *rule; | |
1161 | const struct nft_verdict *verdict; | |
1162 | enum nft_trace_types type; | |
1163 | bool packet_dumped; | |
1164 | bool trace; | |
1165 | }; | |
1166 | ||
1167 | void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, | |
1168 | const struct nft_verdict *verdict, | |
1169 | const struct nft_chain *basechain); | |
1170 | ||
1171 | void nft_trace_notify(struct nft_traceinfo *info); | |
1172 | ||
9370761c PNA |
1173 | #define MODULE_ALIAS_NFT_CHAIN(family, name) \ |
1174 | MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) | |
96518518 | 1175 | |
64d46806 PM |
1176 | #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ |
1177 | MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) | |
1178 | ||
96518518 PM |
1179 | #define MODULE_ALIAS_NFT_EXPR(name) \ |
1180 | MODULE_ALIAS("nft-expr-" name) | |
1181 | ||
20a69341 PM |
1182 | #define MODULE_ALIAS_NFT_SET() \ |
1183 | MODULE_ALIAS("nft-set") | |
1184 | ||
e5009240 PNA |
1185 | #define MODULE_ALIAS_NFT_OBJ(type) \ |
1186 | MODULE_ALIAS("nft-obj-" __stringify(type)) | |
1187 | ||
ea4bd995 PM |
1188 | /* |
1189 | * The gencursor defines two generations, the currently active and the | |
1190 | * next one. Objects contain a bitmask of 2 bits specifying the generations | |
1191 | * they're active in. A set bit means they're inactive in the generation | |
1192 | * represented by that bit. | |
1193 | * | |
1194 | * New objects start out as inactive in the current and active in the | |
1195 | * next generation. When committing the ruleset the bitmask is cleared, | |
1196 | * meaning they're active in all generations. When removing an object, | |
1197 | * it is set inactive in the next generation. After committing the ruleset, | |
1198 | * the objects are removed. | |
1199 | */ | |
1200 | static inline unsigned int nft_gencursor_next(const struct net *net) | |
1201 | { | |
1202 | return net->nft.gencursor + 1 == 1 ? 1 : 0; | |
1203 | } | |
1204 | ||
1205 | static inline u8 nft_genmask_next(const struct net *net) | |
1206 | { | |
1207 | return 1 << nft_gencursor_next(net); | |
1208 | } | |
1209 | ||
1210 | static inline u8 nft_genmask_cur(const struct net *net) | |
1211 | { | |
14cd5d4a MR |
1212 | /* Use READ_ONCE() to prevent refetching the value for atomicity */ |
1213 | return 1 << READ_ONCE(net->nft.gencursor); | |
ea4bd995 PM |
1214 | } |
1215 | ||
22fe54d5 PM |
1216 | #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) |
1217 | ||
889f7ee7 PNA |
1218 | /* |
1219 | * Generic transaction helpers | |
1220 | */ | |
1221 | ||
1222 | /* Check if this object is currently active. */ | |
1223 | #define nft_is_active(__net, __obj) \ | |
1224 | (((__obj)->genmask & nft_genmask_cur(__net)) == 0) | |
1225 | ||
1226 | /* Check if this object is active in the next generation. */ | |
1227 | #define nft_is_active_next(__net, __obj) \ | |
1228 | (((__obj)->genmask & nft_genmask_next(__net)) == 0) | |
1229 | ||
1230 | /* This object becomes active in the next generation. */ | |
1231 | #define nft_activate_next(__net, __obj) \ | |
1232 | (__obj)->genmask = nft_genmask_cur(__net) | |
1233 | ||
1234 | /* This object becomes inactive in the next generation. */ | |
1235 | #define nft_deactivate_next(__net, __obj) \ | |
1236 | (__obj)->genmask = nft_genmask_next(__net) | |
1237 | ||
1238 | /* After committing the ruleset, clear the stale generation bit. */ | |
1239 | #define nft_clear(__net, __obj) \ | |
1240 | (__obj)->genmask &= ~nft_genmask_next(__net) | |
f2a6d766 PNA |
1241 | #define nft_active_genmask(__obj, __genmask) \ |
1242 | !((__obj)->genmask & __genmask) | |
889f7ee7 | 1243 | |
cc02e457 PM |
1244 | /* |
1245 | * Set element transaction helpers | |
1246 | */ | |
1247 | ||
1248 | static inline bool nft_set_elem_active(const struct nft_set_ext *ext, | |
1249 | u8 genmask) | |
1250 | { | |
1251 | return !(ext->genmask & genmask); | |
1252 | } | |
1253 | ||
42a55769 PNA |
1254 | static inline void nft_set_elem_change_active(const struct net *net, |
1255 | const struct nft_set *set, | |
cc02e457 PM |
1256 | struct nft_set_ext *ext) |
1257 | { | |
42a55769 | 1258 | ext->genmask ^= nft_genmask_next(net); |
cc02e457 PM |
1259 | } |
1260 | ||
69086658 PM |
1261 | /* |
1262 | * We use a free bit in the genmask field to indicate the element | |
1263 | * is busy, meaning it is currently being processed either by | |
1264 | * the netlink API or GC. | |
1265 | * | |
1266 | * Even though the genmask is only a single byte wide, this works | |
1267 | * because the extension structure if fully constant once initialized, | |
1268 | * so there are no non-atomic write accesses unless it is already | |
1269 | * marked busy. | |
1270 | */ | |
1271 | #define NFT_SET_ELEM_BUSY_MASK (1 << 2) | |
1272 | ||
1273 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
1274 | #define NFT_SET_ELEM_BUSY_BIT 2 | |
1275 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
1276 | #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) | |
1277 | #else | |
1278 | #error | |
1279 | #endif | |
1280 | ||
1281 | static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) | |
1282 | { | |
1283 | unsigned long *word = (unsigned long *)ext; | |
1284 | ||
1285 | BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); | |
1286 | return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); | |
1287 | } | |
1288 | ||
1289 | static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) | |
1290 | { | |
1291 | unsigned long *word = (unsigned long *)ext; | |
1292 | ||
1293 | clear_bit(NFT_SET_ELEM_BUSY_BIT, word); | |
1294 | } | |
1295 | ||
1a1e1a12 PM |
1296 | /** |
1297 | * struct nft_trans - nf_tables object update in transaction | |
1298 | * | |
1299 | * @list: used internally | |
1300 | * @msg_type: message type | |
0935d558 | 1301 | * @put_net: ctx->net needs to be put |
1a1e1a12 PM |
1302 | * @ctx: transaction context |
1303 | * @data: internal information related to the transaction | |
1304 | */ | |
1305 | struct nft_trans { | |
1306 | struct list_head list; | |
1307 | int msg_type; | |
0935d558 | 1308 | bool put_net; |
1a1e1a12 PM |
1309 | struct nft_ctx ctx; |
1310 | char data[0]; | |
1311 | }; | |
1312 | ||
1313 | struct nft_trans_rule { | |
1314 | struct nft_rule *rule; | |
1a94e38d | 1315 | u32 rule_id; |
1a1e1a12 PM |
1316 | }; |
1317 | ||
1318 | #define nft_trans_rule(trans) \ | |
1319 | (((struct nft_trans_rule *)trans->data)->rule) | |
1a94e38d PNA |
1320 | #define nft_trans_rule_id(trans) \ |
1321 | (((struct nft_trans_rule *)trans->data)->rule_id) | |
1a1e1a12 PM |
1322 | |
1323 | struct nft_trans_set { | |
1324 | struct nft_set *set; | |
1325 | u32 set_id; | |
1326 | }; | |
1327 | ||
1328 | #define nft_trans_set(trans) \ | |
1329 | (((struct nft_trans_set *)trans->data)->set) | |
1330 | #define nft_trans_set_id(trans) \ | |
1331 | (((struct nft_trans_set *)trans->data)->set_id) | |
1332 | ||
1333 | struct nft_trans_chain { | |
1334 | bool update; | |
b7263e07 | 1335 | char *name; |
1a1e1a12 PM |
1336 | struct nft_stats __percpu *stats; |
1337 | u8 policy; | |
1338 | }; | |
1339 | ||
1340 | #define nft_trans_chain_update(trans) \ | |
1341 | (((struct nft_trans_chain *)trans->data)->update) | |
1342 | #define nft_trans_chain_name(trans) \ | |
1343 | (((struct nft_trans_chain *)trans->data)->name) | |
1344 | #define nft_trans_chain_stats(trans) \ | |
1345 | (((struct nft_trans_chain *)trans->data)->stats) | |
1346 | #define nft_trans_chain_policy(trans) \ | |
1347 | (((struct nft_trans_chain *)trans->data)->policy) | |
1348 | ||
1349 | struct nft_trans_table { | |
1350 | bool update; | |
1351 | bool enable; | |
1352 | }; | |
1353 | ||
1354 | #define nft_trans_table_update(trans) \ | |
1355 | (((struct nft_trans_table *)trans->data)->update) | |
1356 | #define nft_trans_table_enable(trans) \ | |
1357 | (((struct nft_trans_table *)trans->data)->enable) | |
1358 | ||
1359 | struct nft_trans_elem { | |
1360 | struct nft_set *set; | |
1361 | struct nft_set_elem elem; | |
1362 | }; | |
1363 | ||
1364 | #define nft_trans_elem_set(trans) \ | |
1365 | (((struct nft_trans_elem *)trans->data)->set) | |
1366 | #define nft_trans_elem(trans) \ | |
1367 | (((struct nft_trans_elem *)trans->data)->elem) | |
1368 | ||
e5009240 PNA |
1369 | struct nft_trans_obj { |
1370 | struct nft_object *obj; | |
1371 | }; | |
1372 | ||
1373 | #define nft_trans_obj(trans) \ | |
1374 | (((struct nft_trans_obj *)trans->data)->obj) | |
1375 | ||
3b49e2e9 PNA |
1376 | struct nft_trans_flowtable { |
1377 | struct nft_flowtable *flowtable; | |
1378 | }; | |
1379 | ||
1380 | #define nft_trans_flowtable(trans) \ | |
1381 | (((struct nft_trans_flowtable *)trans->data)->flowtable) | |
1382 | ||
02c7b25e | 1383 | int __init nft_chain_filter_init(void); |
d209df3e | 1384 | void nft_chain_filter_fini(void); |
02c7b25e | 1385 | |
96518518 | 1386 | #endif /* _NET_NF_TABLES_H */ |