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96518518 PM |
1 | #ifndef _NET_NF_TABLES_H |
2 | #define _NET_NF_TABLES_H | |
3 | ||
0b2d8a7b | 4 | #include <linux/module.h> |
96518518 PM |
5 | #include <linux/list.h> |
6 | #include <linux/netfilter.h> | |
67a8fc27 | 7 | #include <linux/netfilter/nfnetlink.h> |
0ca743a5 | 8 | #include <linux/netfilter/x_tables.h> |
96518518 | 9 | #include <linux/netfilter/nf_tables.h> |
ce355e20 | 10 | #include <linux/u64_stats_sync.h> |
96518518 PM |
11 | #include <net/netlink.h> |
12 | ||
20a69341 PM |
13 | #define NFT_JUMP_STACK_SIZE 16 |
14 | ||
96518518 PM |
15 | struct nft_pktinfo { |
16 | struct sk_buff *skb; | |
17 | const struct net_device *in; | |
18 | const struct net_device *out; | |
c9484874 | 19 | const struct nf_hook_ops *ops; |
96518518 PM |
20 | u8 nhoff; |
21 | u8 thoff; | |
4566bf27 | 22 | u8 tprot; |
0ca743a5 PNA |
23 | /* for x_tables compatibility */ |
24 | struct xt_action_param xt; | |
96518518 PM |
25 | }; |
26 | ||
0ca743a5 PNA |
27 | static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, |
28 | const struct nf_hook_ops *ops, | |
29 | struct sk_buff *skb, | |
073bfd56 | 30 | const struct nf_hook_state *state) |
0ca743a5 PNA |
31 | { |
32 | pkt->skb = skb; | |
073bfd56 DM |
33 | pkt->in = pkt->xt.in = state->in; |
34 | pkt->out = pkt->xt.out = state->out; | |
c9484874 PM |
35 | pkt->ops = ops; |
36 | pkt->xt.hooknum = ops->hooknum; | |
0ca743a5 PNA |
37 | pkt->xt.family = ops->pf; |
38 | } | |
39 | ||
a55e22e9 PM |
40 | /** |
41 | * struct nft_verdict - nf_tables verdict | |
42 | * | |
43 | * @code: nf_tables/netfilter verdict code | |
44 | * @chain: destination chain for NFT_JUMP/NFT_GOTO | |
45 | */ | |
46 | struct nft_verdict { | |
47 | u32 code; | |
48 | struct nft_chain *chain; | |
49 | }; | |
50 | ||
96518518 PM |
51 | struct nft_data { |
52 | union { | |
1ca2e170 PM |
53 | u32 data[4]; |
54 | struct nft_verdict verdict; | |
96518518 PM |
55 | }; |
56 | } __attribute__((aligned(__alignof__(u64)))); | |
57 | ||
a55e22e9 PM |
58 | /** |
59 | * struct nft_regs - nf_tables register set | |
60 | * | |
61 | * @data: data registers | |
62 | * @verdict: verdict register | |
63 | * | |
64 | * The first four data registers alias to the verdict register. | |
65 | */ | |
66 | struct nft_regs { | |
67 | union { | |
49499c3e | 68 | u32 data[20]; |
a55e22e9 PM |
69 | struct nft_verdict verdict; |
70 | }; | |
71 | }; | |
72 | ||
49499c3e PM |
73 | static inline void nft_data_copy(u32 *dst, const struct nft_data *src, |
74 | unsigned int len) | |
96518518 | 75 | { |
49499c3e | 76 | memcpy(dst, src, len); |
96518518 PM |
77 | } |
78 | ||
79 | static inline void nft_data_debug(const struct nft_data *data) | |
80 | { | |
81 | pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n", | |
82 | data->data[0], data->data[1], | |
83 | data->data[2], data->data[3]); | |
84 | } | |
85 | ||
86 | /** | |
20a69341 | 87 | * struct nft_ctx - nf_tables rule/set context |
96518518 | 88 | * |
99633ab2 | 89 | * @net: net namespace |
96518518 PM |
90 | * @afi: address family info |
91 | * @table: the table the chain is contained in | |
92 | * @chain: the chain the rule is contained in | |
0ca743a5 | 93 | * @nla: netlink attributes |
128ad332 PNA |
94 | * @portid: netlink portID of the original message |
95 | * @seq: netlink sequence number | |
96 | * @report: notify via unicast netlink message | |
96518518 PM |
97 | */ |
98 | struct nft_ctx { | |
99633ab2 | 99 | struct net *net; |
7c95f6d8 PNA |
100 | struct nft_af_info *afi; |
101 | struct nft_table *table; | |
102 | struct nft_chain *chain; | |
0ca743a5 | 103 | const struct nlattr * const *nla; |
128ad332 PNA |
104 | u32 portid; |
105 | u32 seq; | |
106 | bool report; | |
96518518 PM |
107 | }; |
108 | ||
96518518 PM |
109 | struct nft_data_desc { |
110 | enum nft_data_types type; | |
111 | unsigned int len; | |
112 | }; | |
113 | ||
d0a11fc3 PM |
114 | int nft_data_init(const struct nft_ctx *ctx, |
115 | struct nft_data *data, unsigned int size, | |
5eccdfaa JP |
116 | struct nft_data_desc *desc, const struct nlattr *nla); |
117 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type); | |
118 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
119 | enum nft_data_types type, unsigned int len); | |
96518518 PM |
120 | |
121 | static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) | |
122 | { | |
123 | return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; | |
124 | } | |
125 | ||
20a69341 PM |
126 | static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) |
127 | { | |
128 | return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1; | |
129 | } | |
130 | ||
b1c96ed3 PM |
131 | unsigned int nft_parse_register(const struct nlattr *attr); |
132 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); | |
133 | ||
d07db988 | 134 | int nft_validate_register_load(enum nft_registers reg, unsigned int len); |
1ec10212 PM |
135 | int nft_validate_register_store(const struct nft_ctx *ctx, |
136 | enum nft_registers reg, | |
137 | const struct nft_data *data, | |
138 | enum nft_data_types type, unsigned int len); | |
96518518 | 139 | |
86f1ec32 PM |
140 | /** |
141 | * struct nft_userdata - user defined data associated with an object | |
142 | * | |
143 | * @len: length of the data | |
144 | * @data: content | |
145 | * | |
146 | * The presence of user data is indicated in an object specific fashion, | |
147 | * so a length of zero can't occur and the value "len" indicates data | |
148 | * of length len + 1. | |
149 | */ | |
150 | struct nft_userdata { | |
151 | u8 len; | |
152 | unsigned char data[0]; | |
153 | }; | |
154 | ||
20a69341 PM |
155 | /** |
156 | * struct nft_set_elem - generic representation of set elements | |
157 | * | |
20a69341 | 158 | * @key: element key |
fe2811eb | 159 | * @priv: element private data and extensions |
20a69341 PM |
160 | */ |
161 | struct nft_set_elem { | |
7d740264 PM |
162 | union { |
163 | u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; | |
164 | struct nft_data val; | |
165 | } key; | |
fe2811eb | 166 | void *priv; |
20a69341 PM |
167 | }; |
168 | ||
169 | struct nft_set; | |
170 | struct nft_set_iter { | |
171 | unsigned int count; | |
172 | unsigned int skip; | |
173 | int err; | |
174 | int (*fn)(const struct nft_ctx *ctx, | |
175 | const struct nft_set *set, | |
176 | const struct nft_set_iter *iter, | |
177 | const struct nft_set_elem *elem); | |
178 | }; | |
179 | ||
c50b960c PM |
180 | /** |
181 | * struct nft_set_desc - description of set elements | |
182 | * | |
183 | * @klen: key length | |
184 | * @dlen: data length | |
185 | * @size: number of set elements | |
186 | */ | |
187 | struct nft_set_desc { | |
188 | unsigned int klen; | |
189 | unsigned int dlen; | |
190 | unsigned int size; | |
191 | }; | |
192 | ||
193 | /** | |
194 | * enum nft_set_class - performance class | |
195 | * | |
196 | * @NFT_LOOKUP_O_1: constant, O(1) | |
197 | * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) | |
198 | * @NFT_LOOKUP_O_N: linear, O(N) | |
199 | */ | |
200 | enum nft_set_class { | |
201 | NFT_SET_CLASS_O_1, | |
202 | NFT_SET_CLASS_O_LOG_N, | |
203 | NFT_SET_CLASS_O_N, | |
204 | }; | |
205 | ||
206 | /** | |
207 | * struct nft_set_estimate - estimation of memory and performance | |
208 | * characteristics | |
209 | * | |
210 | * @size: required memory | |
211 | * @class: lookup performance class | |
212 | */ | |
213 | struct nft_set_estimate { | |
214 | unsigned int size; | |
215 | enum nft_set_class class; | |
216 | }; | |
217 | ||
b2832dd6 | 218 | struct nft_set_ext; |
22fe54d5 | 219 | struct nft_expr; |
b2832dd6 | 220 | |
20a69341 PM |
221 | /** |
222 | * struct nft_set_ops - nf_tables set operations | |
223 | * | |
224 | * @lookup: look up an element within the set | |
225 | * @insert: insert new element into set | |
cc02e457 PM |
226 | * @activate: activate new element in the next generation |
227 | * @deactivate: deactivate element in the next generation | |
20a69341 PM |
228 | * @remove: remove element from set |
229 | * @walk: iterate over all set elemeennts | |
230 | * @privsize: function to return size of set private data | |
231 | * @init: initialize private data of new set instance | |
232 | * @destroy: destroy private data of set instance | |
233 | * @list: nf_tables_set_ops list node | |
234 | * @owner: module reference | |
fe2811eb | 235 | * @elemsize: element private size |
20a69341 PM |
236 | * @features: features supported by the implementation |
237 | */ | |
238 | struct nft_set_ops { | |
239 | bool (*lookup)(const struct nft_set *set, | |
8cd8937a | 240 | const u32 *key, |
b2832dd6 | 241 | const struct nft_set_ext **ext); |
22fe54d5 | 242 | bool (*update)(struct nft_set *set, |
8cd8937a | 243 | const u32 *key, |
22fe54d5 PM |
244 | void *(*new)(struct nft_set *, |
245 | const struct nft_expr *, | |
a55e22e9 | 246 | struct nft_regs *), |
22fe54d5 | 247 | const struct nft_expr *expr, |
a55e22e9 | 248 | struct nft_regs *regs, |
22fe54d5 PM |
249 | const struct nft_set_ext **ext); |
250 | ||
20a69341 PM |
251 | int (*insert)(const struct nft_set *set, |
252 | const struct nft_set_elem *elem); | |
cc02e457 PM |
253 | void (*activate)(const struct nft_set *set, |
254 | const struct nft_set_elem *elem); | |
255 | void * (*deactivate)(const struct nft_set *set, | |
256 | const struct nft_set_elem *elem); | |
20a69341 PM |
257 | void (*remove)(const struct nft_set *set, |
258 | const struct nft_set_elem *elem); | |
259 | void (*walk)(const struct nft_ctx *ctx, | |
260 | const struct nft_set *set, | |
261 | struct nft_set_iter *iter); | |
262 | ||
263 | unsigned int (*privsize)(const struct nlattr * const nla[]); | |
c50b960c PM |
264 | bool (*estimate)(const struct nft_set_desc *desc, |
265 | u32 features, | |
266 | struct nft_set_estimate *est); | |
20a69341 | 267 | int (*init)(const struct nft_set *set, |
c50b960c | 268 | const struct nft_set_desc *desc, |
20a69341 PM |
269 | const struct nlattr * const nla[]); |
270 | void (*destroy)(const struct nft_set *set); | |
271 | ||
272 | struct list_head list; | |
273 | struct module *owner; | |
fe2811eb | 274 | unsigned int elemsize; |
20a69341 PM |
275 | u32 features; |
276 | }; | |
277 | ||
5eccdfaa JP |
278 | int nft_register_set(struct nft_set_ops *ops); |
279 | void nft_unregister_set(struct nft_set_ops *ops); | |
20a69341 PM |
280 | |
281 | /** | |
282 | * struct nft_set - nf_tables set instance | |
283 | * | |
284 | * @list: table set list node | |
285 | * @bindings: list of set bindings | |
286 | * @name: name of the set | |
287 | * @ktype: key type (numeric type defined by userspace, not used in the kernel) | |
288 | * @dtype: data type (verdict or numeric type defined by userspace) | |
c50b960c PM |
289 | * @size: maximum set size |
290 | * @nelems: number of elements | |
3dd0673a | 291 | * @ndeact: number of deactivated elements queued for removal |
761da293 PM |
292 | * @timeout: default timeout value in msecs |
293 | * @gc_int: garbage collection interval in msecs | |
9363dc4b | 294 | * @policy: set parameterization (see enum nft_set_policies) |
20a69341 | 295 | * @ops: set ops |
cc02e457 | 296 | * @pnet: network namespace |
20a69341 PM |
297 | * @flags: set flags |
298 | * @klen: key length | |
299 | * @dlen: data length | |
300 | * @data: private set data | |
301 | */ | |
302 | struct nft_set { | |
303 | struct list_head list; | |
304 | struct list_head bindings; | |
305 | char name[IFNAMSIZ]; | |
306 | u32 ktype; | |
307 | u32 dtype; | |
c50b960c | 308 | u32 size; |
3dd0673a PM |
309 | atomic_t nelems; |
310 | u32 ndeact; | |
761da293 PM |
311 | u64 timeout; |
312 | u32 gc_int; | |
9363dc4b | 313 | u16 policy; |
20a69341 PM |
314 | /* runtime data below here */ |
315 | const struct nft_set_ops *ops ____cacheline_aligned; | |
cc02e457 | 316 | possible_net_t pnet; |
20a69341 PM |
317 | u16 flags; |
318 | u8 klen; | |
319 | u8 dlen; | |
320 | unsigned char data[] | |
321 | __attribute__((aligned(__alignof__(u64)))); | |
322 | }; | |
323 | ||
324 | static inline void *nft_set_priv(const struct nft_set *set) | |
325 | { | |
326 | return (void *)set->data; | |
327 | } | |
328 | ||
9d098292 PM |
329 | static inline struct nft_set *nft_set_container_of(const void *priv) |
330 | { | |
331 | return (void *)priv - offsetof(struct nft_set, data); | |
332 | } | |
333 | ||
5eccdfaa JP |
334 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
335 | const struct nlattr *nla); | |
958bee14 PNA |
336 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
337 | const struct nlattr *nla); | |
20a69341 | 338 | |
761da293 PM |
339 | static inline unsigned long nft_set_gc_interval(const struct nft_set *set) |
340 | { | |
341 | return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ; | |
342 | } | |
343 | ||
20a69341 PM |
344 | /** |
345 | * struct nft_set_binding - nf_tables set binding | |
346 | * | |
347 | * @list: set bindings list node | |
348 | * @chain: chain containing the rule bound to the set | |
11113e19 | 349 | * @flags: set action flags |
20a69341 PM |
350 | * |
351 | * A set binding contains all information necessary for validation | |
352 | * of new elements added to a bound set. | |
353 | */ | |
354 | struct nft_set_binding { | |
355 | struct list_head list; | |
356 | const struct nft_chain *chain; | |
11113e19 | 357 | u32 flags; |
20a69341 PM |
358 | }; |
359 | ||
5eccdfaa JP |
360 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, |
361 | struct nft_set_binding *binding); | |
362 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
363 | struct nft_set_binding *binding); | |
20a69341 | 364 | |
3ac4c07a PM |
365 | /** |
366 | * enum nft_set_extensions - set extension type IDs | |
367 | * | |
368 | * @NFT_SET_EXT_KEY: element key | |
369 | * @NFT_SET_EXT_DATA: mapping data | |
370 | * @NFT_SET_EXT_FLAGS: element flags | |
c3e1b005 PM |
371 | * @NFT_SET_EXT_TIMEOUT: element timeout |
372 | * @NFT_SET_EXT_EXPIRATION: element expiration time | |
68e942e8 | 373 | * @NFT_SET_EXT_USERDATA: user data associated with the element |
f25ad2e9 | 374 | * @NFT_SET_EXT_EXPR: expression assiociated with the element |
3ac4c07a PM |
375 | * @NFT_SET_EXT_NUM: number of extension types |
376 | */ | |
377 | enum nft_set_extensions { | |
378 | NFT_SET_EXT_KEY, | |
379 | NFT_SET_EXT_DATA, | |
380 | NFT_SET_EXT_FLAGS, | |
c3e1b005 PM |
381 | NFT_SET_EXT_TIMEOUT, |
382 | NFT_SET_EXT_EXPIRATION, | |
68e942e8 | 383 | NFT_SET_EXT_USERDATA, |
f25ad2e9 | 384 | NFT_SET_EXT_EXPR, |
3ac4c07a PM |
385 | NFT_SET_EXT_NUM |
386 | }; | |
387 | ||
388 | /** | |
389 | * struct nft_set_ext_type - set extension type | |
390 | * | |
391 | * @len: fixed part length of the extension | |
392 | * @align: alignment requirements of the extension | |
393 | */ | |
394 | struct nft_set_ext_type { | |
395 | u8 len; | |
396 | u8 align; | |
397 | }; | |
398 | ||
399 | extern const struct nft_set_ext_type nft_set_ext_types[]; | |
400 | ||
401 | /** | |
402 | * struct nft_set_ext_tmpl - set extension template | |
403 | * | |
404 | * @len: length of extension area | |
405 | * @offset: offsets of individual extension types | |
406 | */ | |
407 | struct nft_set_ext_tmpl { | |
408 | u16 len; | |
409 | u8 offset[NFT_SET_EXT_NUM]; | |
410 | }; | |
411 | ||
412 | /** | |
413 | * struct nft_set_ext - set extensions | |
414 | * | |
cc02e457 | 415 | * @genmask: generation mask |
3ac4c07a PM |
416 | * @offset: offsets of individual extension types |
417 | * @data: beginning of extension data | |
418 | */ | |
419 | struct nft_set_ext { | |
cc02e457 | 420 | u8 genmask; |
3ac4c07a PM |
421 | u8 offset[NFT_SET_EXT_NUM]; |
422 | char data[0]; | |
423 | }; | |
424 | ||
425 | static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) | |
426 | { | |
427 | memset(tmpl, 0, sizeof(*tmpl)); | |
428 | tmpl->len = sizeof(struct nft_set_ext); | |
429 | } | |
430 | ||
431 | static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, | |
432 | unsigned int len) | |
433 | { | |
434 | tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); | |
435 | BUG_ON(tmpl->len > U8_MAX); | |
436 | tmpl->offset[id] = tmpl->len; | |
437 | tmpl->len += nft_set_ext_types[id].len + len; | |
438 | } | |
439 | ||
440 | static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) | |
441 | { | |
442 | nft_set_ext_add_length(tmpl, id, 0); | |
443 | } | |
444 | ||
445 | static inline void nft_set_ext_init(struct nft_set_ext *ext, | |
446 | const struct nft_set_ext_tmpl *tmpl) | |
447 | { | |
448 | memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); | |
449 | } | |
450 | ||
451 | static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) | |
452 | { | |
453 | return !!ext->offset[id]; | |
454 | } | |
455 | ||
456 | static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) | |
457 | { | |
458 | return ext && __nft_set_ext_exists(ext, id); | |
459 | } | |
460 | ||
461 | static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) | |
462 | { | |
463 | return (void *)ext + ext->offset[id]; | |
464 | } | |
465 | ||
466 | static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) | |
467 | { | |
468 | return nft_set_ext(ext, NFT_SET_EXT_KEY); | |
469 | } | |
470 | ||
471 | static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) | |
472 | { | |
473 | return nft_set_ext(ext, NFT_SET_EXT_DATA); | |
474 | } | |
475 | ||
476 | static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) | |
477 | { | |
478 | return nft_set_ext(ext, NFT_SET_EXT_FLAGS); | |
479 | } | |
ef1f7df9 | 480 | |
c3e1b005 PM |
481 | static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) |
482 | { | |
483 | return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); | |
484 | } | |
485 | ||
486 | static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext) | |
487 | { | |
488 | return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); | |
489 | } | |
490 | ||
68e942e8 PM |
491 | static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) |
492 | { | |
493 | return nft_set_ext(ext, NFT_SET_EXT_USERDATA); | |
494 | } | |
495 | ||
f25ad2e9 PM |
496 | static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext) |
497 | { | |
498 | return nft_set_ext(ext, NFT_SET_EXT_EXPR); | |
499 | } | |
500 | ||
c3e1b005 PM |
501 | static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) |
502 | { | |
503 | return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && | |
504 | time_is_before_eq_jiffies(*nft_set_ext_expiration(ext)); | |
505 | } | |
506 | ||
fe2811eb PM |
507 | static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, |
508 | void *elem) | |
509 | { | |
510 | return elem + set->ops->elemsize; | |
511 | } | |
512 | ||
22fe54d5 PM |
513 | void *nft_set_elem_init(const struct nft_set *set, |
514 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 515 | const u32 *key, const u32 *data, |
22fe54d5 | 516 | u64 timeout, gfp_t gfp); |
61edafbb PM |
517 | void nft_set_elem_destroy(const struct nft_set *set, void *elem); |
518 | ||
cfed7e1b PM |
519 | /** |
520 | * struct nft_set_gc_batch_head - nf_tables set garbage collection batch | |
521 | * | |
522 | * @rcu: rcu head | |
523 | * @set: set the elements belong to | |
524 | * @cnt: count of elements | |
525 | */ | |
526 | struct nft_set_gc_batch_head { | |
527 | struct rcu_head rcu; | |
528 | const struct nft_set *set; | |
529 | unsigned int cnt; | |
530 | }; | |
531 | ||
532 | #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ | |
533 | sizeof(struct nft_set_gc_batch_head)) / \ | |
534 | sizeof(void *)) | |
535 | ||
536 | /** | |
537 | * struct nft_set_gc_batch - nf_tables set garbage collection batch | |
538 | * | |
539 | * @head: GC batch head | |
540 | * @elems: garbage collection elements | |
541 | */ | |
542 | struct nft_set_gc_batch { | |
543 | struct nft_set_gc_batch_head head; | |
544 | void *elems[NFT_SET_GC_BATCH_SIZE]; | |
545 | }; | |
546 | ||
547 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
548 | gfp_t gfp); | |
549 | void nft_set_gc_batch_release(struct rcu_head *rcu); | |
550 | ||
551 | static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) | |
552 | { | |
553 | if (gcb != NULL) | |
554 | call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); | |
555 | } | |
556 | ||
557 | static inline struct nft_set_gc_batch * | |
558 | nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, | |
559 | gfp_t gfp) | |
560 | { | |
561 | if (gcb != NULL) { | |
562 | if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) | |
563 | return gcb; | |
564 | nft_set_gc_batch_complete(gcb); | |
565 | } | |
566 | return nft_set_gc_batch_alloc(set, gfp); | |
567 | } | |
568 | ||
569 | static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, | |
570 | void *elem) | |
571 | { | |
572 | gcb->elems[gcb->head.cnt++] = elem; | |
573 | } | |
574 | ||
96518518 | 575 | /** |
ef1f7df9 | 576 | * struct nft_expr_type - nf_tables expression type |
96518518 | 577 | * |
ef1f7df9 PM |
578 | * @select_ops: function to select nft_expr_ops |
579 | * @ops: default ops, used when no select_ops functions is present | |
96518518 PM |
580 | * @list: used internally |
581 | * @name: Identifier | |
582 | * @owner: module reference | |
583 | * @policy: netlink attribute policy | |
584 | * @maxattr: highest netlink attribute number | |
64d46806 | 585 | * @family: address family for AF-specific types |
151d799a | 586 | * @flags: expression type flags |
ef1f7df9 PM |
587 | */ |
588 | struct nft_expr_type { | |
0ca743a5 PNA |
589 | const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, |
590 | const struct nlattr * const tb[]); | |
ef1f7df9 PM |
591 | const struct nft_expr_ops *ops; |
592 | struct list_head list; | |
593 | const char *name; | |
594 | struct module *owner; | |
595 | const struct nla_policy *policy; | |
596 | unsigned int maxattr; | |
64d46806 | 597 | u8 family; |
151d799a | 598 | u8 flags; |
ef1f7df9 PM |
599 | }; |
600 | ||
151d799a PM |
601 | #define NFT_EXPR_STATEFUL 0x1 |
602 | ||
ef1f7df9 PM |
603 | /** |
604 | * struct nft_expr_ops - nf_tables expression operations | |
605 | * | |
606 | * @eval: Expression evaluation function | |
96518518 | 607 | * @size: full expression size, including private data size |
ef1f7df9 PM |
608 | * @init: initialization function |
609 | * @destroy: destruction function | |
610 | * @dump: function to dump parameters | |
611 | * @type: expression type | |
0ca743a5 PNA |
612 | * @validate: validate expression, called during loop detection |
613 | * @data: extra data to attach to this expression operation | |
96518518 PM |
614 | */ |
615 | struct nft_expr; | |
616 | struct nft_expr_ops { | |
617 | void (*eval)(const struct nft_expr *expr, | |
a55e22e9 | 618 | struct nft_regs *regs, |
96518518 | 619 | const struct nft_pktinfo *pkt); |
ef1f7df9 PM |
620 | unsigned int size; |
621 | ||
96518518 PM |
622 | int (*init)(const struct nft_ctx *ctx, |
623 | const struct nft_expr *expr, | |
624 | const struct nlattr * const tb[]); | |
62472bce PM |
625 | void (*destroy)(const struct nft_ctx *ctx, |
626 | const struct nft_expr *expr); | |
96518518 PM |
627 | int (*dump)(struct sk_buff *skb, |
628 | const struct nft_expr *expr); | |
0ca743a5 PNA |
629 | int (*validate)(const struct nft_ctx *ctx, |
630 | const struct nft_expr *expr, | |
631 | const struct nft_data **data); | |
ef1f7df9 | 632 | const struct nft_expr_type *type; |
0ca743a5 | 633 | void *data; |
96518518 PM |
634 | }; |
635 | ||
ef1f7df9 | 636 | #define NFT_EXPR_MAXATTR 16 |
96518518 PM |
637 | #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ |
638 | ALIGN(size, __alignof__(struct nft_expr))) | |
639 | ||
640 | /** | |
641 | * struct nft_expr - nf_tables expression | |
642 | * | |
643 | * @ops: expression ops | |
644 | * @data: expression private data | |
645 | */ | |
646 | struct nft_expr { | |
647 | const struct nft_expr_ops *ops; | |
648 | unsigned char data[]; | |
649 | }; | |
650 | ||
651 | static inline void *nft_expr_priv(const struct nft_expr *expr) | |
652 | { | |
653 | return (void *)expr->data; | |
654 | } | |
655 | ||
0b2d8a7b PM |
656 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
657 | const struct nlattr *nla); | |
658 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); | |
659 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, | |
660 | const struct nft_expr *expr); | |
661 | ||
662 | static inline void nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) | |
663 | { | |
664 | __module_get(src->ops->type->owner); | |
665 | memcpy(dst, src, src->ops->size); | |
666 | } | |
667 | ||
96518518 PM |
668 | /** |
669 | * struct nft_rule - nf_tables rule | |
670 | * | |
671 | * @list: used internally | |
96518518 | 672 | * @handle: rule handle |
0628b123 | 673 | * @genmask: generation mask |
96518518 | 674 | * @dlen: length of expression data |
86f1ec32 | 675 | * @udata: user data is appended to the rule |
96518518 PM |
676 | * @data: expression data |
677 | */ | |
678 | struct nft_rule { | |
679 | struct list_head list; | |
0768b3b3 | 680 | u64 handle:42, |
0628b123 | 681 | genmask:2, |
0768b3b3 | 682 | dlen:12, |
86f1ec32 | 683 | udata:1; |
96518518 PM |
684 | unsigned char data[] |
685 | __attribute__((aligned(__alignof__(struct nft_expr)))); | |
686 | }; | |
687 | ||
688 | static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) | |
689 | { | |
690 | return (struct nft_expr *)&rule->data[0]; | |
691 | } | |
692 | ||
693 | static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) | |
694 | { | |
695 | return ((void *)expr) + expr->ops->size; | |
696 | } | |
697 | ||
698 | static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) | |
699 | { | |
700 | return (struct nft_expr *)&rule->data[rule->dlen]; | |
701 | } | |
702 | ||
86f1ec32 | 703 | static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) |
0768b3b3 PNA |
704 | { |
705 | return (void *)&rule->data[rule->dlen]; | |
706 | } | |
707 | ||
96518518 PM |
708 | /* |
709 | * The last pointer isn't really necessary, but the compiler isn't able to | |
710 | * determine that the result of nft_expr_last() is always the same since it | |
711 | * can't assume that the dlen value wasn't changed within calls in the loop. | |
712 | */ | |
713 | #define nft_rule_for_each_expr(expr, last, rule) \ | |
714 | for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ | |
715 | (expr) != (last); \ | |
716 | (expr) = nft_expr_next(expr)) | |
717 | ||
718 | enum nft_chain_flags { | |
719 | NFT_BASE_CHAIN = 0x1, | |
91c7b38d | 720 | NFT_CHAIN_INACTIVE = 0x2, |
96518518 PM |
721 | }; |
722 | ||
723 | /** | |
724 | * struct nft_chain - nf_tables chain | |
725 | * | |
726 | * @rules: list of rules in the chain | |
727 | * @list: used internally | |
b5bc89bf | 728 | * @table: table that this chain belongs to |
96518518 | 729 | * @handle: chain handle |
96518518 PM |
730 | * @use: number of jump references to this chain |
731 | * @level: length of longest path to this chain | |
a0a7379e | 732 | * @flags: bitmask of enum nft_chain_flags |
96518518 PM |
733 | * @name: name of the chain |
734 | */ | |
735 | struct nft_chain { | |
736 | struct list_head rules; | |
737 | struct list_head list; | |
b5bc89bf | 738 | struct nft_table *table; |
96518518 | 739 | u64 handle; |
a0a7379e | 740 | u32 use; |
96518518 | 741 | u16 level; |
a0a7379e | 742 | u8 flags; |
96518518 PM |
743 | char name[NFT_CHAIN_MAXNAMELEN]; |
744 | }; | |
745 | ||
9370761c PNA |
746 | enum nft_chain_type { |
747 | NFT_CHAIN_T_DEFAULT = 0, | |
748 | NFT_CHAIN_T_ROUTE, | |
749 | NFT_CHAIN_T_NAT, | |
750 | NFT_CHAIN_T_MAX | |
751 | }; | |
752 | ||
1a1e1a12 PM |
753 | /** |
754 | * struct nf_chain_type - nf_tables chain type info | |
755 | * | |
756 | * @name: name of the type | |
757 | * @type: numeric identifier | |
758 | * @family: address family | |
759 | * @owner: module owner | |
760 | * @hook_mask: mask of valid hooks | |
761 | * @hooks: hookfn overrides | |
762 | */ | |
763 | struct nf_chain_type { | |
764 | const char *name; | |
765 | enum nft_chain_type type; | |
766 | int family; | |
767 | struct module *owner; | |
768 | unsigned int hook_mask; | |
769 | nf_hookfn *hooks[NF_MAX_HOOKS]; | |
770 | }; | |
771 | ||
7210e4e3 PNA |
772 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
773 | enum nft_chain_type type); | |
75e8d06d PNA |
774 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
775 | unsigned int hook_flags); | |
7210e4e3 | 776 | |
0ca743a5 | 777 | struct nft_stats { |
ce355e20 ED |
778 | u64 bytes; |
779 | u64 pkts; | |
780 | struct u64_stats_sync syncp; | |
0ca743a5 PNA |
781 | }; |
782 | ||
115a60b1 | 783 | #define NFT_HOOK_OPS_MAX 2 |
835b8033 | 784 | #define NFT_BASECHAIN_DISABLED (1 << 0) |
115a60b1 | 785 | |
96518518 PM |
786 | /** |
787 | * struct nft_base_chain - nf_tables base chain | |
788 | * | |
789 | * @ops: netfilter hook ops | |
5ebb335d | 790 | * @pnet: net namespace that this chain belongs to |
9370761c | 791 | * @type: chain type |
0ca743a5 PNA |
792 | * @policy: default policy |
793 | * @stats: per-cpu chain stats | |
96518518 | 794 | * @chain: the chain |
2cbce139 | 795 | * @dev_name: device name that this base chain is attached to (if any) |
96518518 PM |
796 | */ |
797 | struct nft_base_chain { | |
115a60b1 | 798 | struct nf_hook_ops ops[NFT_HOOK_OPS_MAX]; |
5ebb335d | 799 | possible_net_t pnet; |
2a37d755 | 800 | const struct nf_chain_type *type; |
0ca743a5 | 801 | u8 policy; |
835b8033 | 802 | u8 flags; |
0ca743a5 | 803 | struct nft_stats __percpu *stats; |
96518518 | 804 | struct nft_chain chain; |
2cbce139 | 805 | char dev_name[IFNAMSIZ]; |
96518518 PM |
806 | }; |
807 | ||
808 | static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) | |
809 | { | |
810 | return container_of(chain, struct nft_base_chain, chain); | |
811 | } | |
812 | ||
835b8033 PNA |
813 | int nft_register_basechain(struct nft_base_chain *basechain, |
814 | unsigned int hook_nops); | |
815 | void nft_unregister_basechain(struct nft_base_chain *basechain, | |
816 | unsigned int hook_nops); | |
817 | ||
3876d22d PM |
818 | unsigned int nft_do_chain(struct nft_pktinfo *pkt, |
819 | const struct nf_hook_ops *ops); | |
96518518 | 820 | |
96518518 PM |
821 | /** |
822 | * struct nft_table - nf_tables table | |
823 | * | |
824 | * @list: used internally | |
825 | * @chains: chains in the table | |
826 | * @sets: sets in the table | |
827 | * @hgenerator: handle generator state | |
828 | * @use: number of chain references to this table | |
829 | * @flags: table flag (see enum nft_table_flags) | |
830 | * @name: name of the table | |
831 | */ | |
832 | struct nft_table { | |
833 | struct list_head list; | |
834 | struct list_head chains; | |
835 | struct list_head sets; | |
836 | u64 hgenerator; | |
837 | u32 use; | |
838 | u16 flags; | |
1cae565e | 839 | char name[NFT_TABLE_MAXNAMELEN]; |
ebddf1a8 PNA |
840 | }; |
841 | ||
842 | enum nft_af_flags { | |
843 | NFT_AF_NEEDS_DEV = (1 << 0), | |
96518518 PM |
844 | }; |
845 | ||
846 | /** | |
847 | * struct nft_af_info - nf_tables address family info | |
848 | * | |
849 | * @list: used internally | |
850 | * @family: address family | |
851 | * @nhooks: number of hooks in this family | |
852 | * @owner: module owner | |
853 | * @tables: used internally | |
ebddf1a8 | 854 | * @flags: family flags |
115a60b1 PM |
855 | * @nops: number of hook ops in this family |
856 | * @hook_ops_init: initialization function for chain hook ops | |
96518518 PM |
857 | * @hooks: hookfn overrides for packet validation |
858 | */ | |
859 | struct nft_af_info { | |
860 | struct list_head list; | |
861 | int family; | |
862 | unsigned int nhooks; | |
863 | struct module *owner; | |
864 | struct list_head tables; | |
ebddf1a8 | 865 | u32 flags; |
115a60b1 PM |
866 | unsigned int nops; |
867 | void (*hook_ops_init)(struct nf_hook_ops *, | |
868 | unsigned int); | |
96518518 PM |
869 | nf_hookfn *hooks[NF_MAX_HOOKS]; |
870 | }; | |
871 | ||
5eccdfaa JP |
872 | int nft_register_afinfo(struct net *, struct nft_af_info *); |
873 | void nft_unregister_afinfo(struct nft_af_info *); | |
96518518 | 874 | |
2a37d755 PM |
875 | int nft_register_chain_type(const struct nf_chain_type *); |
876 | void nft_unregister_chain_type(const struct nf_chain_type *); | |
96518518 | 877 | |
5eccdfaa JP |
878 | int nft_register_expr(struct nft_expr_type *); |
879 | void nft_unregister_expr(struct nft_expr_type *); | |
96518518 | 880 | |
67a8fc27 PM |
881 | #define nft_dereference(p) \ |
882 | nfnl_dereference(p, NFNL_SUBSYS_NFTABLES) | |
883 | ||
96518518 PM |
884 | #define MODULE_ALIAS_NFT_FAMILY(family) \ |
885 | MODULE_ALIAS("nft-afinfo-" __stringify(family)) | |
886 | ||
9370761c PNA |
887 | #define MODULE_ALIAS_NFT_CHAIN(family, name) \ |
888 | MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) | |
96518518 | 889 | |
64d46806 PM |
890 | #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ |
891 | MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) | |
892 | ||
96518518 PM |
893 | #define MODULE_ALIAS_NFT_EXPR(name) \ |
894 | MODULE_ALIAS("nft-expr-" name) | |
895 | ||
20a69341 PM |
896 | #define MODULE_ALIAS_NFT_SET() \ |
897 | MODULE_ALIAS("nft-set") | |
898 | ||
ea4bd995 PM |
899 | /* |
900 | * The gencursor defines two generations, the currently active and the | |
901 | * next one. Objects contain a bitmask of 2 bits specifying the generations | |
902 | * they're active in. A set bit means they're inactive in the generation | |
903 | * represented by that bit. | |
904 | * | |
905 | * New objects start out as inactive in the current and active in the | |
906 | * next generation. When committing the ruleset the bitmask is cleared, | |
907 | * meaning they're active in all generations. When removing an object, | |
908 | * it is set inactive in the next generation. After committing the ruleset, | |
909 | * the objects are removed. | |
910 | */ | |
911 | static inline unsigned int nft_gencursor_next(const struct net *net) | |
912 | { | |
913 | return net->nft.gencursor + 1 == 1 ? 1 : 0; | |
914 | } | |
915 | ||
916 | static inline u8 nft_genmask_next(const struct net *net) | |
917 | { | |
918 | return 1 << nft_gencursor_next(net); | |
919 | } | |
920 | ||
921 | static inline u8 nft_genmask_cur(const struct net *net) | |
922 | { | |
923 | /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */ | |
924 | return 1 << ACCESS_ONCE(net->nft.gencursor); | |
925 | } | |
926 | ||
22fe54d5 PM |
927 | #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) |
928 | ||
cc02e457 PM |
929 | /* |
930 | * Set element transaction helpers | |
931 | */ | |
932 | ||
933 | static inline bool nft_set_elem_active(const struct nft_set_ext *ext, | |
934 | u8 genmask) | |
935 | { | |
936 | return !(ext->genmask & genmask); | |
937 | } | |
938 | ||
939 | static inline void nft_set_elem_change_active(const struct nft_set *set, | |
940 | struct nft_set_ext *ext) | |
941 | { | |
942 | ext->genmask ^= nft_genmask_next(read_pnet(&set->pnet)); | |
943 | } | |
944 | ||
69086658 PM |
945 | /* |
946 | * We use a free bit in the genmask field to indicate the element | |
947 | * is busy, meaning it is currently being processed either by | |
948 | * the netlink API or GC. | |
949 | * | |
950 | * Even though the genmask is only a single byte wide, this works | |
951 | * because the extension structure if fully constant once initialized, | |
952 | * so there are no non-atomic write accesses unless it is already | |
953 | * marked busy. | |
954 | */ | |
955 | #define NFT_SET_ELEM_BUSY_MASK (1 << 2) | |
956 | ||
957 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
958 | #define NFT_SET_ELEM_BUSY_BIT 2 | |
959 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
960 | #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) | |
961 | #else | |
962 | #error | |
963 | #endif | |
964 | ||
965 | static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) | |
966 | { | |
967 | unsigned long *word = (unsigned long *)ext; | |
968 | ||
969 | BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); | |
970 | return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); | |
971 | } | |
972 | ||
973 | static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) | |
974 | { | |
975 | unsigned long *word = (unsigned long *)ext; | |
976 | ||
977 | clear_bit(NFT_SET_ELEM_BUSY_BIT, word); | |
978 | } | |
979 | ||
1a1e1a12 PM |
980 | /** |
981 | * struct nft_trans - nf_tables object update in transaction | |
982 | * | |
983 | * @list: used internally | |
984 | * @msg_type: message type | |
985 | * @ctx: transaction context | |
986 | * @data: internal information related to the transaction | |
987 | */ | |
988 | struct nft_trans { | |
989 | struct list_head list; | |
990 | int msg_type; | |
991 | struct nft_ctx ctx; | |
992 | char data[0]; | |
993 | }; | |
994 | ||
995 | struct nft_trans_rule { | |
996 | struct nft_rule *rule; | |
997 | }; | |
998 | ||
999 | #define nft_trans_rule(trans) \ | |
1000 | (((struct nft_trans_rule *)trans->data)->rule) | |
1001 | ||
1002 | struct nft_trans_set { | |
1003 | struct nft_set *set; | |
1004 | u32 set_id; | |
1005 | }; | |
1006 | ||
1007 | #define nft_trans_set(trans) \ | |
1008 | (((struct nft_trans_set *)trans->data)->set) | |
1009 | #define nft_trans_set_id(trans) \ | |
1010 | (((struct nft_trans_set *)trans->data)->set_id) | |
1011 | ||
1012 | struct nft_trans_chain { | |
1013 | bool update; | |
1014 | char name[NFT_CHAIN_MAXNAMELEN]; | |
1015 | struct nft_stats __percpu *stats; | |
1016 | u8 policy; | |
1017 | }; | |
1018 | ||
1019 | #define nft_trans_chain_update(trans) \ | |
1020 | (((struct nft_trans_chain *)trans->data)->update) | |
1021 | #define nft_trans_chain_name(trans) \ | |
1022 | (((struct nft_trans_chain *)trans->data)->name) | |
1023 | #define nft_trans_chain_stats(trans) \ | |
1024 | (((struct nft_trans_chain *)trans->data)->stats) | |
1025 | #define nft_trans_chain_policy(trans) \ | |
1026 | (((struct nft_trans_chain *)trans->data)->policy) | |
1027 | ||
1028 | struct nft_trans_table { | |
1029 | bool update; | |
1030 | bool enable; | |
1031 | }; | |
1032 | ||
1033 | #define nft_trans_table_update(trans) \ | |
1034 | (((struct nft_trans_table *)trans->data)->update) | |
1035 | #define nft_trans_table_enable(trans) \ | |
1036 | (((struct nft_trans_table *)trans->data)->enable) | |
1037 | ||
1038 | struct nft_trans_elem { | |
1039 | struct nft_set *set; | |
1040 | struct nft_set_elem elem; | |
1041 | }; | |
1042 | ||
1043 | #define nft_trans_elem_set(trans) \ | |
1044 | (((struct nft_trans_elem *)trans->data)->set) | |
1045 | #define nft_trans_elem(trans) \ | |
1046 | (((struct nft_trans_elem *)trans->data)->elem) | |
1047 | ||
96518518 | 1048 | #endif /* _NET_NF_TABLES_H */ |