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