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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; | |
beac5afa | 17 | bool tprot_set; |
4566bf27 | 18 | u8 tprot; |
0ca743a5 PNA |
19 | /* for x_tables compatibility */ |
20 | struct xt_action_param xt; | |
96518518 PM |
21 | }; |
22 | ||
0e5a1c7e PNA |
23 | static inline struct net *nft_net(const struct nft_pktinfo *pkt) |
24 | { | |
25 | return pkt->xt.state->net; | |
26 | } | |
27 | ||
28 | static inline unsigned int nft_hook(const struct nft_pktinfo *pkt) | |
29 | { | |
30 | return pkt->xt.state->hook; | |
31 | } | |
32 | ||
33 | static inline u8 nft_pf(const struct nft_pktinfo *pkt) | |
34 | { | |
35 | return pkt->xt.state->pf; | |
36 | } | |
37 | ||
38 | static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt) | |
39 | { | |
40 | return pkt->xt.state->in; | |
41 | } | |
42 | ||
43 | static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt) | |
44 | { | |
45 | return pkt->xt.state->out; | |
46 | } | |
47 | ||
0ca743a5 | 48 | static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, |
0ca743a5 | 49 | struct sk_buff *skb, |
073bfd56 | 50 | const struct nf_hook_state *state) |
0ca743a5 PNA |
51 | { |
52 | pkt->skb = skb; | |
613dbd95 | 53 | pkt->xt.state = state; |
0ca743a5 PNA |
54 | } |
55 | ||
beac5afa PNA |
56 | static inline void nft_set_pktinfo_proto_unspec(struct nft_pktinfo *pkt, |
57 | struct sk_buff *skb) | |
58 | { | |
59 | pkt->tprot_set = false; | |
60 | pkt->tprot = 0; | |
61 | pkt->xt.thoff = 0; | |
62 | pkt->xt.fragoff = 0; | |
63 | } | |
64 | ||
65 | static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt, | |
66 | struct sk_buff *skb, | |
67 | const struct nf_hook_state *state) | |
68 | { | |
69 | nft_set_pktinfo(pkt, skb, state); | |
70 | nft_set_pktinfo_proto_unspec(pkt, skb); | |
71 | } | |
72 | ||
a55e22e9 PM |
73 | /** |
74 | * struct nft_verdict - nf_tables verdict | |
75 | * | |
76 | * @code: nf_tables/netfilter verdict code | |
77 | * @chain: destination chain for NFT_JUMP/NFT_GOTO | |
78 | */ | |
79 | struct nft_verdict { | |
80 | u32 code; | |
81 | struct nft_chain *chain; | |
82 | }; | |
83 | ||
96518518 PM |
84 | struct nft_data { |
85 | union { | |
1ca2e170 PM |
86 | u32 data[4]; |
87 | struct nft_verdict verdict; | |
96518518 PM |
88 | }; |
89 | } __attribute__((aligned(__alignof__(u64)))); | |
90 | ||
a55e22e9 PM |
91 | /** |
92 | * struct nft_regs - nf_tables register set | |
93 | * | |
94 | * @data: data registers | |
95 | * @verdict: verdict register | |
96 | * | |
97 | * The first four data registers alias to the verdict register. | |
98 | */ | |
99 | struct nft_regs { | |
100 | union { | |
49499c3e | 101 | u32 data[20]; |
a55e22e9 PM |
102 | struct nft_verdict verdict; |
103 | }; | |
104 | }; | |
105 | ||
49499c3e PM |
106 | static inline void nft_data_copy(u32 *dst, const struct nft_data *src, |
107 | unsigned int len) | |
96518518 | 108 | { |
49499c3e | 109 | memcpy(dst, src, len); |
96518518 PM |
110 | } |
111 | ||
112 | static inline void nft_data_debug(const struct nft_data *data) | |
113 | { | |
114 | pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n", | |
115 | data->data[0], data->data[1], | |
116 | data->data[2], data->data[3]); | |
117 | } | |
118 | ||
119 | /** | |
20a69341 | 120 | * struct nft_ctx - nf_tables rule/set context |
96518518 | 121 | * |
99633ab2 | 122 | * @net: net namespace |
96518518 PM |
123 | * @afi: address family info |
124 | * @table: the table the chain is contained in | |
125 | * @chain: the chain the rule is contained in | |
0ca743a5 | 126 | * @nla: netlink attributes |
128ad332 PNA |
127 | * @portid: netlink portID of the original message |
128 | * @seq: netlink sequence number | |
129 | * @report: notify via unicast netlink message | |
96518518 PM |
130 | */ |
131 | struct nft_ctx { | |
99633ab2 | 132 | struct net *net; |
7c95f6d8 PNA |
133 | struct nft_af_info *afi; |
134 | struct nft_table *table; | |
135 | struct nft_chain *chain; | |
0ca743a5 | 136 | const struct nlattr * const *nla; |
128ad332 PNA |
137 | u32 portid; |
138 | u32 seq; | |
139 | bool report; | |
96518518 PM |
140 | }; |
141 | ||
96518518 PM |
142 | struct nft_data_desc { |
143 | enum nft_data_types type; | |
144 | unsigned int len; | |
145 | }; | |
146 | ||
d0a11fc3 PM |
147 | int nft_data_init(const struct nft_ctx *ctx, |
148 | struct nft_data *data, unsigned int size, | |
5eccdfaa JP |
149 | struct nft_data_desc *desc, const struct nlattr *nla); |
150 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type); | |
151 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
152 | enum nft_data_types type, unsigned int len); | |
96518518 PM |
153 | |
154 | static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) | |
155 | { | |
156 | return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; | |
157 | } | |
158 | ||
20a69341 PM |
159 | static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) |
160 | { | |
bf798657 | 161 | return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; |
20a69341 PM |
162 | } |
163 | ||
f1d505bb | 164 | int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); |
b1c96ed3 PM |
165 | unsigned int nft_parse_register(const struct nlattr *attr); |
166 | int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); | |
167 | ||
d07db988 | 168 | int nft_validate_register_load(enum nft_registers reg, unsigned int len); |
1ec10212 PM |
169 | int nft_validate_register_store(const struct nft_ctx *ctx, |
170 | enum nft_registers reg, | |
171 | const struct nft_data *data, | |
172 | enum nft_data_types type, unsigned int len); | |
96518518 | 173 | |
86f1ec32 PM |
174 | /** |
175 | * struct nft_userdata - user defined data associated with an object | |
176 | * | |
177 | * @len: length of the data | |
178 | * @data: content | |
179 | * | |
180 | * The presence of user data is indicated in an object specific fashion, | |
181 | * so a length of zero can't occur and the value "len" indicates data | |
182 | * of length len + 1. | |
183 | */ | |
184 | struct nft_userdata { | |
185 | u8 len; | |
186 | unsigned char data[0]; | |
187 | }; | |
188 | ||
20a69341 PM |
189 | /** |
190 | * struct nft_set_elem - generic representation of set elements | |
191 | * | |
20a69341 | 192 | * @key: element key |
fe2811eb | 193 | * @priv: element private data and extensions |
20a69341 PM |
194 | */ |
195 | struct nft_set_elem { | |
7d740264 PM |
196 | union { |
197 | u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; | |
198 | struct nft_data val; | |
199 | } key; | |
fe2811eb | 200 | void *priv; |
20a69341 PM |
201 | }; |
202 | ||
203 | struct nft_set; | |
204 | struct nft_set_iter { | |
8588ac09 | 205 | u8 genmask; |
1f48ff6c | 206 | bool flush; |
20a69341 PM |
207 | unsigned int count; |
208 | unsigned int skip; | |
209 | int err; | |
210 | int (*fn)(const struct nft_ctx *ctx, | |
de70185d | 211 | struct nft_set *set, |
20a69341 | 212 | const struct nft_set_iter *iter, |
de70185d | 213 | struct nft_set_elem *elem); |
20a69341 PM |
214 | }; |
215 | ||
c50b960c PM |
216 | /** |
217 | * struct nft_set_desc - description of set elements | |
218 | * | |
219 | * @klen: key length | |
220 | * @dlen: data length | |
221 | * @size: number of set elements | |
222 | */ | |
223 | struct nft_set_desc { | |
224 | unsigned int klen; | |
225 | unsigned int dlen; | |
226 | unsigned int size; | |
227 | }; | |
228 | ||
229 | /** | |
230 | * enum nft_set_class - performance class | |
231 | * | |
232 | * @NFT_LOOKUP_O_1: constant, O(1) | |
233 | * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) | |
234 | * @NFT_LOOKUP_O_N: linear, O(N) | |
235 | */ | |
236 | enum nft_set_class { | |
237 | NFT_SET_CLASS_O_1, | |
238 | NFT_SET_CLASS_O_LOG_N, | |
239 | NFT_SET_CLASS_O_N, | |
240 | }; | |
241 | ||
242 | /** | |
243 | * struct nft_set_estimate - estimation of memory and performance | |
244 | * characteristics | |
245 | * | |
246 | * @size: required memory | |
247 | * @class: lookup performance class | |
248 | */ | |
249 | struct nft_set_estimate { | |
250 | unsigned int size; | |
251 | enum nft_set_class class; | |
252 | }; | |
253 | ||
b2832dd6 | 254 | struct nft_set_ext; |
22fe54d5 | 255 | struct nft_expr; |
b2832dd6 | 256 | |
20a69341 PM |
257 | /** |
258 | * struct nft_set_ops - nf_tables set operations | |
259 | * | |
260 | * @lookup: look up an element within the set | |
261 | * @insert: insert new element into set | |
cc02e457 | 262 | * @activate: activate new element in the next generation |
8411b644 | 263 | * @deactivate: lookup for element and deactivate it in the next generation |
1ba1c414 | 264 | * @flush: deactivate element in the next generation |
20a69341 PM |
265 | * @remove: remove element from set |
266 | * @walk: iterate over all set elemeennts | |
267 | * @privsize: function to return size of set private data | |
268 | * @init: initialize private data of new set instance | |
269 | * @destroy: destroy private data of set instance | |
270 | * @list: nf_tables_set_ops list node | |
271 | * @owner: module reference | |
fe2811eb | 272 | * @elemsize: element private size |
20a69341 PM |
273 | * @features: features supported by the implementation |
274 | */ | |
275 | struct nft_set_ops { | |
42a55769 PNA |
276 | bool (*lookup)(const struct net *net, |
277 | const struct nft_set *set, | |
8cd8937a | 278 | const u32 *key, |
b2832dd6 | 279 | const struct nft_set_ext **ext); |
22fe54d5 | 280 | bool (*update)(struct nft_set *set, |
8cd8937a | 281 | const u32 *key, |
22fe54d5 PM |
282 | void *(*new)(struct nft_set *, |
283 | const struct nft_expr *, | |
a55e22e9 | 284 | struct nft_regs *), |
22fe54d5 | 285 | const struct nft_expr *expr, |
a55e22e9 | 286 | struct nft_regs *regs, |
22fe54d5 PM |
287 | const struct nft_set_ext **ext); |
288 | ||
42a55769 PNA |
289 | int (*insert)(const struct net *net, |
290 | const struct nft_set *set, | |
c016c7e4 PNA |
291 | const struct nft_set_elem *elem, |
292 | struct nft_set_ext **ext); | |
42a55769 PNA |
293 | void (*activate)(const struct net *net, |
294 | const struct nft_set *set, | |
cc02e457 | 295 | const struct nft_set_elem *elem); |
42a55769 PNA |
296 | void * (*deactivate)(const struct net *net, |
297 | const struct nft_set *set, | |
cc02e457 | 298 | const struct nft_set_elem *elem); |
1ba1c414 PNA |
299 | bool (*flush)(const struct net *net, |
300 | const struct nft_set *set, | |
301 | void *priv); | |
5cb82a38 PNA |
302 | void (*remove)(const struct net *net, |
303 | const struct nft_set *set, | |
20a69341 PM |
304 | const struct nft_set_elem *elem); |
305 | void (*walk)(const struct nft_ctx *ctx, | |
de70185d | 306 | struct nft_set *set, |
20a69341 PM |
307 | struct nft_set_iter *iter); |
308 | ||
309 | unsigned int (*privsize)(const struct nlattr * const nla[]); | |
c50b960c PM |
310 | bool (*estimate)(const struct nft_set_desc *desc, |
311 | u32 features, | |
312 | struct nft_set_estimate *est); | |
20a69341 | 313 | int (*init)(const struct nft_set *set, |
c50b960c | 314 | const struct nft_set_desc *desc, |
20a69341 PM |
315 | const struct nlattr * const nla[]); |
316 | void (*destroy)(const struct nft_set *set); | |
317 | ||
318 | struct list_head list; | |
319 | struct module *owner; | |
fe2811eb | 320 | unsigned int elemsize; |
20a69341 PM |
321 | u32 features; |
322 | }; | |
323 | ||
5eccdfaa JP |
324 | int nft_register_set(struct nft_set_ops *ops); |
325 | void nft_unregister_set(struct nft_set_ops *ops); | |
20a69341 PM |
326 | |
327 | /** | |
328 | * struct nft_set - nf_tables set instance | |
329 | * | |
330 | * @list: table set list node | |
331 | * @bindings: list of set bindings | |
332 | * @name: name of the set | |
333 | * @ktype: key type (numeric type defined by userspace, not used in the kernel) | |
334 | * @dtype: data type (verdict or numeric type defined by userspace) | |
8aeff920 | 335 | * @objtype: object type (see NFT_OBJECT_* definitions) |
c50b960c PM |
336 | * @size: maximum set size |
337 | * @nelems: number of elements | |
3dd0673a | 338 | * @ndeact: number of deactivated elements queued for removal |
d3e2a111 | 339 | * @timeout: default timeout value in jiffies |
761da293 | 340 | * @gc_int: garbage collection interval in msecs |
9363dc4b | 341 | * @policy: set parameterization (see enum nft_set_policies) |
e6d8ecac CFG |
342 | * @udlen: user data length |
343 | * @udata: user data | |
20a69341 PM |
344 | * @ops: set ops |
345 | * @flags: set flags | |
37a9cc52 | 346 | * @genmask: generation mask |
20a69341 PM |
347 | * @klen: key length |
348 | * @dlen: data length | |
349 | * @data: private set data | |
350 | */ | |
351 | struct nft_set { | |
352 | struct list_head list; | |
353 | struct list_head bindings; | |
cb39ad8b | 354 | char name[NFT_SET_MAXNAMELEN]; |
20a69341 PM |
355 | u32 ktype; |
356 | u32 dtype; | |
8aeff920 | 357 | u32 objtype; |
c50b960c | 358 | u32 size; |
3dd0673a PM |
359 | atomic_t nelems; |
360 | u32 ndeact; | |
761da293 PM |
361 | u64 timeout; |
362 | u32 gc_int; | |
9363dc4b | 363 | u16 policy; |
e6d8ecac CFG |
364 | u16 udlen; |
365 | unsigned char *udata; | |
20a69341 PM |
366 | /* runtime data below here */ |
367 | const struct nft_set_ops *ops ____cacheline_aligned; | |
37a9cc52 PNA |
368 | u16 flags:14, |
369 | genmask:2; | |
20a69341 PM |
370 | u8 klen; |
371 | u8 dlen; | |
372 | unsigned char data[] | |
373 | __attribute__((aligned(__alignof__(u64)))); | |
374 | }; | |
375 | ||
376 | static inline void *nft_set_priv(const struct nft_set *set) | |
377 | { | |
378 | return (void *)set->data; | |
379 | } | |
380 | ||
9d098292 PM |
381 | static inline struct nft_set *nft_set_container_of(const void *priv) |
382 | { | |
383 | return (void *)priv - offsetof(struct nft_set, data); | |
384 | } | |
385 | ||
5eccdfaa | 386 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, |
37a9cc52 | 387 | const struct nlattr *nla, u8 genmask); |
958bee14 | 388 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
37a9cc52 | 389 | const struct nlattr *nla, u8 genmask); |
20a69341 | 390 | |
761da293 PM |
391 | static inline unsigned long nft_set_gc_interval(const struct nft_set *set) |
392 | { | |
393 | return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ; | |
394 | } | |
395 | ||
20a69341 PM |
396 | /** |
397 | * struct nft_set_binding - nf_tables set binding | |
398 | * | |
399 | * @list: set bindings list node | |
400 | * @chain: chain containing the rule bound to the set | |
11113e19 | 401 | * @flags: set action flags |
20a69341 PM |
402 | * |
403 | * A set binding contains all information necessary for validation | |
404 | * of new elements added to a bound set. | |
405 | */ | |
406 | struct nft_set_binding { | |
407 | struct list_head list; | |
408 | const struct nft_chain *chain; | |
11113e19 | 409 | u32 flags; |
20a69341 PM |
410 | }; |
411 | ||
5eccdfaa JP |
412 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, |
413 | struct nft_set_binding *binding); | |
414 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
415 | struct nft_set_binding *binding); | |
20a69341 | 416 | |
3ac4c07a PM |
417 | /** |
418 | * enum nft_set_extensions - set extension type IDs | |
419 | * | |
420 | * @NFT_SET_EXT_KEY: element key | |
421 | * @NFT_SET_EXT_DATA: mapping data | |
422 | * @NFT_SET_EXT_FLAGS: element flags | |
c3e1b005 PM |
423 | * @NFT_SET_EXT_TIMEOUT: element timeout |
424 | * @NFT_SET_EXT_EXPIRATION: element expiration time | |
68e942e8 | 425 | * @NFT_SET_EXT_USERDATA: user data associated with the element |
f25ad2e9 | 426 | * @NFT_SET_EXT_EXPR: expression assiociated with the element |
8aeff920 | 427 | * @NFT_SET_EXT_OBJREF: stateful object reference associated with element |
3ac4c07a PM |
428 | * @NFT_SET_EXT_NUM: number of extension types |
429 | */ | |
430 | enum nft_set_extensions { | |
431 | NFT_SET_EXT_KEY, | |
432 | NFT_SET_EXT_DATA, | |
433 | NFT_SET_EXT_FLAGS, | |
c3e1b005 PM |
434 | NFT_SET_EXT_TIMEOUT, |
435 | NFT_SET_EXT_EXPIRATION, | |
68e942e8 | 436 | NFT_SET_EXT_USERDATA, |
f25ad2e9 | 437 | NFT_SET_EXT_EXPR, |
8aeff920 | 438 | NFT_SET_EXT_OBJREF, |
3ac4c07a PM |
439 | NFT_SET_EXT_NUM |
440 | }; | |
441 | ||
442 | /** | |
443 | * struct nft_set_ext_type - set extension type | |
444 | * | |
445 | * @len: fixed part length of the extension | |
446 | * @align: alignment requirements of the extension | |
447 | */ | |
448 | struct nft_set_ext_type { | |
449 | u8 len; | |
450 | u8 align; | |
451 | }; | |
452 | ||
453 | extern const struct nft_set_ext_type nft_set_ext_types[]; | |
454 | ||
455 | /** | |
456 | * struct nft_set_ext_tmpl - set extension template | |
457 | * | |
458 | * @len: length of extension area | |
459 | * @offset: offsets of individual extension types | |
460 | */ | |
461 | struct nft_set_ext_tmpl { | |
462 | u16 len; | |
463 | u8 offset[NFT_SET_EXT_NUM]; | |
464 | }; | |
465 | ||
466 | /** | |
467 | * struct nft_set_ext - set extensions | |
468 | * | |
cc02e457 | 469 | * @genmask: generation mask |
3ac4c07a PM |
470 | * @offset: offsets of individual extension types |
471 | * @data: beginning of extension data | |
472 | */ | |
473 | struct nft_set_ext { | |
cc02e457 | 474 | u8 genmask; |
3ac4c07a PM |
475 | u8 offset[NFT_SET_EXT_NUM]; |
476 | char data[0]; | |
477 | }; | |
478 | ||
479 | static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) | |
480 | { | |
481 | memset(tmpl, 0, sizeof(*tmpl)); | |
482 | tmpl->len = sizeof(struct nft_set_ext); | |
483 | } | |
484 | ||
485 | static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, | |
486 | unsigned int len) | |
487 | { | |
488 | tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); | |
489 | BUG_ON(tmpl->len > U8_MAX); | |
490 | tmpl->offset[id] = tmpl->len; | |
491 | tmpl->len += nft_set_ext_types[id].len + len; | |
492 | } | |
493 | ||
494 | static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) | |
495 | { | |
496 | nft_set_ext_add_length(tmpl, id, 0); | |
497 | } | |
498 | ||
499 | static inline void nft_set_ext_init(struct nft_set_ext *ext, | |
500 | const struct nft_set_ext_tmpl *tmpl) | |
501 | { | |
502 | memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); | |
503 | } | |
504 | ||
505 | static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) | |
506 | { | |
507 | return !!ext->offset[id]; | |
508 | } | |
509 | ||
510 | static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) | |
511 | { | |
512 | return ext && __nft_set_ext_exists(ext, id); | |
513 | } | |
514 | ||
515 | static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) | |
516 | { | |
517 | return (void *)ext + ext->offset[id]; | |
518 | } | |
519 | ||
520 | static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) | |
521 | { | |
522 | return nft_set_ext(ext, NFT_SET_EXT_KEY); | |
523 | } | |
524 | ||
525 | static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) | |
526 | { | |
527 | return nft_set_ext(ext, NFT_SET_EXT_DATA); | |
528 | } | |
529 | ||
530 | static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) | |
531 | { | |
532 | return nft_set_ext(ext, NFT_SET_EXT_FLAGS); | |
533 | } | |
ef1f7df9 | 534 | |
c3e1b005 PM |
535 | static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) |
536 | { | |
537 | return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); | |
538 | } | |
539 | ||
540 | static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext) | |
541 | { | |
542 | return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); | |
543 | } | |
544 | ||
68e942e8 PM |
545 | static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) |
546 | { | |
547 | return nft_set_ext(ext, NFT_SET_EXT_USERDATA); | |
548 | } | |
549 | ||
f25ad2e9 PM |
550 | static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext) |
551 | { | |
552 | return nft_set_ext(ext, NFT_SET_EXT_EXPR); | |
553 | } | |
554 | ||
c3e1b005 PM |
555 | static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) |
556 | { | |
557 | return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && | |
558 | time_is_before_eq_jiffies(*nft_set_ext_expiration(ext)); | |
559 | } | |
560 | ||
fe2811eb PM |
561 | static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, |
562 | void *elem) | |
563 | { | |
564 | return elem + set->ops->elemsize; | |
565 | } | |
566 | ||
8aeff920 PNA |
567 | static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) |
568 | { | |
569 | return nft_set_ext(ext, NFT_SET_EXT_OBJREF); | |
570 | } | |
571 | ||
22fe54d5 PM |
572 | void *nft_set_elem_init(const struct nft_set *set, |
573 | const struct nft_set_ext_tmpl *tmpl, | |
49499c3e | 574 | const u32 *key, const u32 *data, |
22fe54d5 | 575 | u64 timeout, gfp_t gfp); |
61f9e292 LZ |
576 | void nft_set_elem_destroy(const struct nft_set *set, void *elem, |
577 | bool destroy_expr); | |
61edafbb | 578 | |
cfed7e1b PM |
579 | /** |
580 | * struct nft_set_gc_batch_head - nf_tables set garbage collection batch | |
581 | * | |
582 | * @rcu: rcu head | |
583 | * @set: set the elements belong to | |
584 | * @cnt: count of elements | |
585 | */ | |
586 | struct nft_set_gc_batch_head { | |
587 | struct rcu_head rcu; | |
588 | const struct nft_set *set; | |
589 | unsigned int cnt; | |
590 | }; | |
591 | ||
592 | #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ | |
593 | sizeof(struct nft_set_gc_batch_head)) / \ | |
594 | sizeof(void *)) | |
595 | ||
596 | /** | |
597 | * struct nft_set_gc_batch - nf_tables set garbage collection batch | |
598 | * | |
599 | * @head: GC batch head | |
600 | * @elems: garbage collection elements | |
601 | */ | |
602 | struct nft_set_gc_batch { | |
603 | struct nft_set_gc_batch_head head; | |
604 | void *elems[NFT_SET_GC_BATCH_SIZE]; | |
605 | }; | |
606 | ||
607 | struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, | |
608 | gfp_t gfp); | |
609 | void nft_set_gc_batch_release(struct rcu_head *rcu); | |
610 | ||
611 | static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) | |
612 | { | |
613 | if (gcb != NULL) | |
614 | call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); | |
615 | } | |
616 | ||
617 | static inline struct nft_set_gc_batch * | |
618 | nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, | |
619 | gfp_t gfp) | |
620 | { | |
621 | if (gcb != NULL) { | |
622 | if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) | |
623 | return gcb; | |
624 | nft_set_gc_batch_complete(gcb); | |
625 | } | |
626 | return nft_set_gc_batch_alloc(set, gfp); | |
627 | } | |
628 | ||
629 | static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, | |
630 | void *elem) | |
631 | { | |
632 | gcb->elems[gcb->head.cnt++] = elem; | |
633 | } | |
634 | ||
96518518 | 635 | /** |
ef1f7df9 | 636 | * struct nft_expr_type - nf_tables expression type |
96518518 | 637 | * |
ef1f7df9 PM |
638 | * @select_ops: function to select nft_expr_ops |
639 | * @ops: default ops, used when no select_ops functions is present | |
96518518 PM |
640 | * @list: used internally |
641 | * @name: Identifier | |
642 | * @owner: module reference | |
643 | * @policy: netlink attribute policy | |
644 | * @maxattr: highest netlink attribute number | |
64d46806 | 645 | * @family: address family for AF-specific types |
151d799a | 646 | * @flags: expression type flags |
ef1f7df9 PM |
647 | */ |
648 | struct nft_expr_type { | |
0ca743a5 PNA |
649 | const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, |
650 | const struct nlattr * const tb[]); | |
ef1f7df9 PM |
651 | const struct nft_expr_ops *ops; |
652 | struct list_head list; | |
653 | const char *name; | |
654 | struct module *owner; | |
655 | const struct nla_policy *policy; | |
656 | unsigned int maxattr; | |
64d46806 | 657 | u8 family; |
151d799a | 658 | u8 flags; |
ef1f7df9 PM |
659 | }; |
660 | ||
151d799a PM |
661 | #define NFT_EXPR_STATEFUL 0x1 |
662 | ||
ef1f7df9 PM |
663 | /** |
664 | * struct nft_expr_ops - nf_tables expression operations | |
665 | * | |
666 | * @eval: Expression evaluation function | |
96518518 | 667 | * @size: full expression size, including private data size |
ef1f7df9 PM |
668 | * @init: initialization function |
669 | * @destroy: destruction function | |
670 | * @dump: function to dump parameters | |
671 | * @type: expression type | |
0ca743a5 PNA |
672 | * @validate: validate expression, called during loop detection |
673 | * @data: extra data to attach to this expression operation | |
96518518 PM |
674 | */ |
675 | struct nft_expr; | |
676 | struct nft_expr_ops { | |
677 | void (*eval)(const struct nft_expr *expr, | |
a55e22e9 | 678 | struct nft_regs *regs, |
96518518 | 679 | const struct nft_pktinfo *pkt); |
086f3321 PNA |
680 | int (*clone)(struct nft_expr *dst, |
681 | const struct nft_expr *src); | |
ef1f7df9 PM |
682 | unsigned int size; |
683 | ||
96518518 PM |
684 | int (*init)(const struct nft_ctx *ctx, |
685 | const struct nft_expr *expr, | |
686 | const struct nlattr * const tb[]); | |
62472bce PM |
687 | void (*destroy)(const struct nft_ctx *ctx, |
688 | const struct nft_expr *expr); | |
96518518 PM |
689 | int (*dump)(struct sk_buff *skb, |
690 | const struct nft_expr *expr); | |
0ca743a5 PNA |
691 | int (*validate)(const struct nft_ctx *ctx, |
692 | const struct nft_expr *expr, | |
693 | const struct nft_data **data); | |
ef1f7df9 | 694 | const struct nft_expr_type *type; |
0ca743a5 | 695 | void *data; |
96518518 PM |
696 | }; |
697 | ||
ef1f7df9 | 698 | #define NFT_EXPR_MAXATTR 16 |
96518518 PM |
699 | #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ |
700 | ALIGN(size, __alignof__(struct nft_expr))) | |
701 | ||
702 | /** | |
703 | * struct nft_expr - nf_tables expression | |
704 | * | |
705 | * @ops: expression ops | |
706 | * @data: expression private data | |
707 | */ | |
708 | struct nft_expr { | |
709 | const struct nft_expr_ops *ops; | |
710 | unsigned char data[]; | |
711 | }; | |
712 | ||
713 | static inline void *nft_expr_priv(const struct nft_expr *expr) | |
714 | { | |
715 | return (void *)expr->data; | |
716 | } | |
717 | ||
0b2d8a7b PM |
718 | struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, |
719 | const struct nlattr *nla); | |
720 | void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); | |
721 | int nft_expr_dump(struct sk_buff *skb, unsigned int attr, | |
722 | const struct nft_expr *expr); | |
723 | ||
086f3321 | 724 | static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) |
0b2d8a7b | 725 | { |
086f3321 PNA |
726 | int err; |
727 | ||
086f3321 PNA |
728 | if (src->ops->clone) { |
729 | dst->ops = src->ops; | |
730 | err = src->ops->clone(dst, src); | |
731 | if (err < 0) | |
732 | return err; | |
733 | } else { | |
734 | memcpy(dst, src, src->ops->size); | |
735 | } | |
61f9e292 LZ |
736 | |
737 | __module_get(src->ops->type->owner); | |
086f3321 | 738 | return 0; |
0b2d8a7b PM |
739 | } |
740 | ||
96518518 PM |
741 | /** |
742 | * struct nft_rule - nf_tables rule | |
743 | * | |
744 | * @list: used internally | |
96518518 | 745 | * @handle: rule handle |
0628b123 | 746 | * @genmask: generation mask |
96518518 | 747 | * @dlen: length of expression data |
86f1ec32 | 748 | * @udata: user data is appended to the rule |
96518518 PM |
749 | * @data: expression data |
750 | */ | |
751 | struct nft_rule { | |
752 | struct list_head list; | |
0768b3b3 | 753 | u64 handle:42, |
0628b123 | 754 | genmask:2, |
0768b3b3 | 755 | dlen:12, |
86f1ec32 | 756 | udata:1; |
96518518 PM |
757 | unsigned char data[] |
758 | __attribute__((aligned(__alignof__(struct nft_expr)))); | |
759 | }; | |
760 | ||
761 | static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) | |
762 | { | |
763 | return (struct nft_expr *)&rule->data[0]; | |
764 | } | |
765 | ||
766 | static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) | |
767 | { | |
768 | return ((void *)expr) + expr->ops->size; | |
769 | } | |
770 | ||
771 | static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) | |
772 | { | |
773 | return (struct nft_expr *)&rule->data[rule->dlen]; | |
774 | } | |
775 | ||
86f1ec32 | 776 | static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) |
0768b3b3 PNA |
777 | { |
778 | return (void *)&rule->data[rule->dlen]; | |
779 | } | |
780 | ||
96518518 PM |
781 | /* |
782 | * The last pointer isn't really necessary, but the compiler isn't able to | |
783 | * determine that the result of nft_expr_last() is always the same since it | |
784 | * can't assume that the dlen value wasn't changed within calls in the loop. | |
785 | */ | |
786 | #define nft_rule_for_each_expr(expr, last, rule) \ | |
787 | for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ | |
788 | (expr) != (last); \ | |
789 | (expr) = nft_expr_next(expr)) | |
790 | ||
791 | enum nft_chain_flags { | |
792 | NFT_BASE_CHAIN = 0x1, | |
96518518 PM |
793 | }; |
794 | ||
795 | /** | |
796 | * struct nft_chain - nf_tables chain | |
797 | * | |
798 | * @rules: list of rules in the chain | |
799 | * @list: used internally | |
b5bc89bf | 800 | * @table: table that this chain belongs to |
96518518 | 801 | * @handle: chain handle |
96518518 PM |
802 | * @use: number of jump references to this chain |
803 | * @level: length of longest path to this chain | |
a0a7379e | 804 | * @flags: bitmask of enum nft_chain_flags |
96518518 PM |
805 | * @name: name of the chain |
806 | */ | |
807 | struct nft_chain { | |
808 | struct list_head rules; | |
809 | struct list_head list; | |
b5bc89bf | 810 | struct nft_table *table; |
96518518 | 811 | u64 handle; |
a0a7379e | 812 | u32 use; |
96518518 | 813 | u16 level; |
664b0f8c PNA |
814 | u8 flags:6, |
815 | genmask:2; | |
96518518 PM |
816 | char name[NFT_CHAIN_MAXNAMELEN]; |
817 | }; | |
818 | ||
9370761c PNA |
819 | enum nft_chain_type { |
820 | NFT_CHAIN_T_DEFAULT = 0, | |
821 | NFT_CHAIN_T_ROUTE, | |
822 | NFT_CHAIN_T_NAT, | |
823 | NFT_CHAIN_T_MAX | |
824 | }; | |
825 | ||
1a1e1a12 PM |
826 | /** |
827 | * struct nf_chain_type - nf_tables chain type info | |
828 | * | |
829 | * @name: name of the type | |
830 | * @type: numeric identifier | |
831 | * @family: address family | |
832 | * @owner: module owner | |
833 | * @hook_mask: mask of valid hooks | |
834 | * @hooks: hookfn overrides | |
835 | */ | |
836 | struct nf_chain_type { | |
837 | const char *name; | |
838 | enum nft_chain_type type; | |
839 | int family; | |
840 | struct module *owner; | |
841 | unsigned int hook_mask; | |
842 | nf_hookfn *hooks[NF_MAX_HOOKS]; | |
843 | }; | |
844 | ||
7210e4e3 PNA |
845 | int nft_chain_validate_dependency(const struct nft_chain *chain, |
846 | enum nft_chain_type type); | |
75e8d06d PNA |
847 | int nft_chain_validate_hooks(const struct nft_chain *chain, |
848 | unsigned int hook_flags); | |
7210e4e3 | 849 | |
0ca743a5 | 850 | struct nft_stats { |
ce355e20 ED |
851 | u64 bytes; |
852 | u64 pkts; | |
853 | struct u64_stats_sync syncp; | |
0ca743a5 PNA |
854 | }; |
855 | ||
115a60b1 PM |
856 | #define NFT_HOOK_OPS_MAX 2 |
857 | ||
96518518 PM |
858 | /** |
859 | * struct nft_base_chain - nf_tables base chain | |
860 | * | |
861 | * @ops: netfilter hook ops | |
9370761c | 862 | * @type: chain type |
0ca743a5 PNA |
863 | * @policy: default policy |
864 | * @stats: per-cpu chain stats | |
96518518 | 865 | * @chain: the chain |
2cbce139 | 866 | * @dev_name: device name that this base chain is attached to (if any) |
96518518 PM |
867 | */ |
868 | struct nft_base_chain { | |
115a60b1 | 869 | struct nf_hook_ops ops[NFT_HOOK_OPS_MAX]; |
2a37d755 | 870 | const struct nf_chain_type *type; |
0ca743a5 | 871 | u8 policy; |
835b8033 | 872 | u8 flags; |
0ca743a5 | 873 | struct nft_stats __percpu *stats; |
96518518 | 874 | struct nft_chain chain; |
2cbce139 | 875 | char dev_name[IFNAMSIZ]; |
96518518 PM |
876 | }; |
877 | ||
878 | static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) | |
879 | { | |
880 | return container_of(chain, struct nft_base_chain, chain); | |
881 | } | |
882 | ||
5ebe0b0e | 883 | int __nft_release_basechain(struct nft_ctx *ctx); |
835b8033 | 884 | |
06198b34 | 885 | unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); |
96518518 | 886 | |
96518518 PM |
887 | /** |
888 | * struct nft_table - nf_tables table | |
889 | * | |
890 | * @list: used internally | |
891 | * @chains: chains in the table | |
892 | * @sets: sets in the table | |
e5009240 | 893 | * @objects: stateful objects in the table |
96518518 PM |
894 | * @hgenerator: handle generator state |
895 | * @use: number of chain references to this table | |
896 | * @flags: table flag (see enum nft_table_flags) | |
f2a6d766 | 897 | * @genmask: generation mask |
96518518 PM |
898 | * @name: name of the table |
899 | */ | |
900 | struct nft_table { | |
901 | struct list_head list; | |
902 | struct list_head chains; | |
903 | struct list_head sets; | |
e5009240 | 904 | struct list_head objects; |
96518518 PM |
905 | u64 hgenerator; |
906 | u32 use; | |
f2a6d766 PNA |
907 | u16 flags:14, |
908 | genmask:2; | |
1cae565e | 909 | char name[NFT_TABLE_MAXNAMELEN]; |
ebddf1a8 PNA |
910 | }; |
911 | ||
912 | enum nft_af_flags { | |
913 | NFT_AF_NEEDS_DEV = (1 << 0), | |
96518518 PM |
914 | }; |
915 | ||
916 | /** | |
917 | * struct nft_af_info - nf_tables address family info | |
918 | * | |
919 | * @list: used internally | |
920 | * @family: address family | |
921 | * @nhooks: number of hooks in this family | |
922 | * @owner: module owner | |
923 | * @tables: used internally | |
ebddf1a8 | 924 | * @flags: family flags |
115a60b1 PM |
925 | * @nops: number of hook ops in this family |
926 | * @hook_ops_init: initialization function for chain hook ops | |
96518518 PM |
927 | * @hooks: hookfn overrides for packet validation |
928 | */ | |
929 | struct nft_af_info { | |
930 | struct list_head list; | |
931 | int family; | |
932 | unsigned int nhooks; | |
933 | struct module *owner; | |
934 | struct list_head tables; | |
ebddf1a8 | 935 | u32 flags; |
115a60b1 PM |
936 | unsigned int nops; |
937 | void (*hook_ops_init)(struct nf_hook_ops *, | |
938 | unsigned int); | |
96518518 PM |
939 | nf_hookfn *hooks[NF_MAX_HOOKS]; |
940 | }; | |
941 | ||
5eccdfaa | 942 | int nft_register_afinfo(struct net *, struct nft_af_info *); |
df05ef87 | 943 | void nft_unregister_afinfo(struct net *, struct nft_af_info *); |
96518518 | 944 | |
2a37d755 PM |
945 | int nft_register_chain_type(const struct nf_chain_type *); |
946 | void nft_unregister_chain_type(const struct nf_chain_type *); | |
96518518 | 947 | |
5eccdfaa JP |
948 | int nft_register_expr(struct nft_expr_type *); |
949 | void nft_unregister_expr(struct nft_expr_type *); | |
96518518 | 950 | |
33d5a7b1 FW |
951 | int nft_verdict_dump(struct sk_buff *skb, int type, |
952 | const struct nft_verdict *v); | |
953 | ||
e5009240 PNA |
954 | /** |
955 | * struct nft_object - nf_tables stateful object | |
956 | * | |
957 | * @list: table stateful object list node | |
18965317 | 958 | * @table: table this object belongs to |
e5009240 PNA |
959 | * @type: pointer to object type |
960 | * @data: pointer to object data | |
961 | * @name: name of this stateful object | |
962 | * @genmask: generation mask | |
963 | * @use: number of references to this stateful object | |
964 | * @data: object data, layout depends on type | |
965 | */ | |
966 | struct nft_object { | |
967 | struct list_head list; | |
968 | char name[NFT_OBJ_MAXNAMELEN]; | |
18965317 | 969 | struct nft_table *table; |
e5009240 PNA |
970 | u32 genmask:2, |
971 | use:30; | |
972 | /* runtime data below here */ | |
973 | const struct nft_object_type *type ____cacheline_aligned; | |
974 | unsigned char data[] | |
975 | __attribute__((aligned(__alignof__(u64)))); | |
976 | }; | |
977 | ||
978 | static inline void *nft_obj_data(const struct nft_object *obj) | |
979 | { | |
980 | return (void *)obj->data; | |
981 | } | |
982 | ||
983 | #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) | |
984 | ||
985 | struct nft_object *nf_tables_obj_lookup(const struct nft_table *table, | |
986 | const struct nlattr *nla, u32 objtype, | |
987 | u8 genmask); | |
988 | ||
2599e989 PNA |
989 | int nft_obj_notify(struct net *net, struct nft_table *table, |
990 | struct nft_object *obj, u32 portid, u32 seq, | |
991 | int event, int family, int report, gfp_t gfp); | |
992 | ||
e5009240 PNA |
993 | /** |
994 | * struct nft_object_type - stateful object type | |
995 | * | |
996 | * @eval: stateful object evaluation function | |
997 | * @list: list node in list of object types | |
998 | * @type: stateful object numeric type | |
999 | * @size: stateful object size | |
1000 | * @owner: module owner | |
1001 | * @maxattr: maximum netlink attribute | |
1002 | * @policy: netlink attribute policy | |
1003 | * @init: initialize object from netlink attributes | |
1004 | * @destroy: release existing stateful object | |
1005 | * @dump: netlink dump stateful object | |
1006 | */ | |
1007 | struct nft_object_type { | |
1008 | void (*eval)(struct nft_object *obj, | |
1009 | struct nft_regs *regs, | |
1010 | const struct nft_pktinfo *pkt); | |
1011 | struct list_head list; | |
1012 | u32 type; | |
1013 | unsigned int size; | |
1014 | unsigned int maxattr; | |
1015 | struct module *owner; | |
1016 | const struct nla_policy *policy; | |
1017 | int (*init)(const struct nlattr * const tb[], | |
1018 | struct nft_object *obj); | |
1019 | void (*destroy)(struct nft_object *obj); | |
1020 | int (*dump)(struct sk_buff *skb, | |
43da04a5 PNA |
1021 | struct nft_object *obj, |
1022 | bool reset); | |
e5009240 PNA |
1023 | }; |
1024 | ||
1025 | int nft_register_obj(struct nft_object_type *obj_type); | |
1026 | void nft_unregister_obj(struct nft_object_type *obj_type); | |
1027 | ||
33d5a7b1 FW |
1028 | /** |
1029 | * struct nft_traceinfo - nft tracing information and state | |
1030 | * | |
1031 | * @pkt: pktinfo currently processed | |
1032 | * @basechain: base chain currently processed | |
1033 | * @chain: chain currently processed | |
1034 | * @rule: rule that was evaluated | |
1035 | * @verdict: verdict given by rule | |
1036 | * @type: event type (enum nft_trace_types) | |
1037 | * @packet_dumped: packet headers sent in a previous traceinfo message | |
1038 | * @trace: other struct members are initialised | |
1039 | */ | |
1040 | struct nft_traceinfo { | |
1041 | const struct nft_pktinfo *pkt; | |
1042 | const struct nft_base_chain *basechain; | |
1043 | const struct nft_chain *chain; | |
1044 | const struct nft_rule *rule; | |
1045 | const struct nft_verdict *verdict; | |
1046 | enum nft_trace_types type; | |
1047 | bool packet_dumped; | |
1048 | bool trace; | |
1049 | }; | |
1050 | ||
1051 | void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, | |
1052 | const struct nft_verdict *verdict, | |
1053 | const struct nft_chain *basechain); | |
1054 | ||
1055 | void nft_trace_notify(struct nft_traceinfo *info); | |
1056 | ||
67a8fc27 PM |
1057 | #define nft_dereference(p) \ |
1058 | nfnl_dereference(p, NFNL_SUBSYS_NFTABLES) | |
1059 | ||
96518518 PM |
1060 | #define MODULE_ALIAS_NFT_FAMILY(family) \ |
1061 | MODULE_ALIAS("nft-afinfo-" __stringify(family)) | |
1062 | ||
9370761c PNA |
1063 | #define MODULE_ALIAS_NFT_CHAIN(family, name) \ |
1064 | MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) | |
96518518 | 1065 | |
64d46806 PM |
1066 | #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ |
1067 | MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) | |
1068 | ||
96518518 PM |
1069 | #define MODULE_ALIAS_NFT_EXPR(name) \ |
1070 | MODULE_ALIAS("nft-expr-" name) | |
1071 | ||
20a69341 PM |
1072 | #define MODULE_ALIAS_NFT_SET() \ |
1073 | MODULE_ALIAS("nft-set") | |
1074 | ||
e5009240 PNA |
1075 | #define MODULE_ALIAS_NFT_OBJ(type) \ |
1076 | MODULE_ALIAS("nft-obj-" __stringify(type)) | |
1077 | ||
ea4bd995 PM |
1078 | /* |
1079 | * The gencursor defines two generations, the currently active and the | |
1080 | * next one. Objects contain a bitmask of 2 bits specifying the generations | |
1081 | * they're active in. A set bit means they're inactive in the generation | |
1082 | * represented by that bit. | |
1083 | * | |
1084 | * New objects start out as inactive in the current and active in the | |
1085 | * next generation. When committing the ruleset the bitmask is cleared, | |
1086 | * meaning they're active in all generations. When removing an object, | |
1087 | * it is set inactive in the next generation. After committing the ruleset, | |
1088 | * the objects are removed. | |
1089 | */ | |
1090 | static inline unsigned int nft_gencursor_next(const struct net *net) | |
1091 | { | |
1092 | return net->nft.gencursor + 1 == 1 ? 1 : 0; | |
1093 | } | |
1094 | ||
1095 | static inline u8 nft_genmask_next(const struct net *net) | |
1096 | { | |
1097 | return 1 << nft_gencursor_next(net); | |
1098 | } | |
1099 | ||
1100 | static inline u8 nft_genmask_cur(const struct net *net) | |
1101 | { | |
1102 | /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */ | |
1103 | return 1 << ACCESS_ONCE(net->nft.gencursor); | |
1104 | } | |
1105 | ||
22fe54d5 PM |
1106 | #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) |
1107 | ||
889f7ee7 PNA |
1108 | /* |
1109 | * Generic transaction helpers | |
1110 | */ | |
1111 | ||
1112 | /* Check if this object is currently active. */ | |
1113 | #define nft_is_active(__net, __obj) \ | |
1114 | (((__obj)->genmask & nft_genmask_cur(__net)) == 0) | |
1115 | ||
1116 | /* Check if this object is active in the next generation. */ | |
1117 | #define nft_is_active_next(__net, __obj) \ | |
1118 | (((__obj)->genmask & nft_genmask_next(__net)) == 0) | |
1119 | ||
1120 | /* This object becomes active in the next generation. */ | |
1121 | #define nft_activate_next(__net, __obj) \ | |
1122 | (__obj)->genmask = nft_genmask_cur(__net) | |
1123 | ||
1124 | /* This object becomes inactive in the next generation. */ | |
1125 | #define nft_deactivate_next(__net, __obj) \ | |
1126 | (__obj)->genmask = nft_genmask_next(__net) | |
1127 | ||
1128 | /* After committing the ruleset, clear the stale generation bit. */ | |
1129 | #define nft_clear(__net, __obj) \ | |
1130 | (__obj)->genmask &= ~nft_genmask_next(__net) | |
f2a6d766 PNA |
1131 | #define nft_active_genmask(__obj, __genmask) \ |
1132 | !((__obj)->genmask & __genmask) | |
889f7ee7 | 1133 | |
cc02e457 PM |
1134 | /* |
1135 | * Set element transaction helpers | |
1136 | */ | |
1137 | ||
1138 | static inline bool nft_set_elem_active(const struct nft_set_ext *ext, | |
1139 | u8 genmask) | |
1140 | { | |
1141 | return !(ext->genmask & genmask); | |
1142 | } | |
1143 | ||
42a55769 PNA |
1144 | static inline void nft_set_elem_change_active(const struct net *net, |
1145 | const struct nft_set *set, | |
cc02e457 PM |
1146 | struct nft_set_ext *ext) |
1147 | { | |
42a55769 | 1148 | ext->genmask ^= nft_genmask_next(net); |
cc02e457 PM |
1149 | } |
1150 | ||
69086658 PM |
1151 | /* |
1152 | * We use a free bit in the genmask field to indicate the element | |
1153 | * is busy, meaning it is currently being processed either by | |
1154 | * the netlink API or GC. | |
1155 | * | |
1156 | * Even though the genmask is only a single byte wide, this works | |
1157 | * because the extension structure if fully constant once initialized, | |
1158 | * so there are no non-atomic write accesses unless it is already | |
1159 | * marked busy. | |
1160 | */ | |
1161 | #define NFT_SET_ELEM_BUSY_MASK (1 << 2) | |
1162 | ||
1163 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
1164 | #define NFT_SET_ELEM_BUSY_BIT 2 | |
1165 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
1166 | #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) | |
1167 | #else | |
1168 | #error | |
1169 | #endif | |
1170 | ||
1171 | static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) | |
1172 | { | |
1173 | unsigned long *word = (unsigned long *)ext; | |
1174 | ||
1175 | BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); | |
1176 | return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); | |
1177 | } | |
1178 | ||
1179 | static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) | |
1180 | { | |
1181 | unsigned long *word = (unsigned long *)ext; | |
1182 | ||
1183 | clear_bit(NFT_SET_ELEM_BUSY_BIT, word); | |
1184 | } | |
1185 | ||
1a1e1a12 PM |
1186 | /** |
1187 | * struct nft_trans - nf_tables object update in transaction | |
1188 | * | |
1189 | * @list: used internally | |
1190 | * @msg_type: message type | |
1191 | * @ctx: transaction context | |
1192 | * @data: internal information related to the transaction | |
1193 | */ | |
1194 | struct nft_trans { | |
1195 | struct list_head list; | |
1196 | int msg_type; | |
1197 | struct nft_ctx ctx; | |
1198 | char data[0]; | |
1199 | }; | |
1200 | ||
1201 | struct nft_trans_rule { | |
1202 | struct nft_rule *rule; | |
1203 | }; | |
1204 | ||
1205 | #define nft_trans_rule(trans) \ | |
1206 | (((struct nft_trans_rule *)trans->data)->rule) | |
1207 | ||
1208 | struct nft_trans_set { | |
1209 | struct nft_set *set; | |
1210 | u32 set_id; | |
1211 | }; | |
1212 | ||
1213 | #define nft_trans_set(trans) \ | |
1214 | (((struct nft_trans_set *)trans->data)->set) | |
1215 | #define nft_trans_set_id(trans) \ | |
1216 | (((struct nft_trans_set *)trans->data)->set_id) | |
1217 | ||
1218 | struct nft_trans_chain { | |
1219 | bool update; | |
1220 | char name[NFT_CHAIN_MAXNAMELEN]; | |
1221 | struct nft_stats __percpu *stats; | |
1222 | u8 policy; | |
1223 | }; | |
1224 | ||
1225 | #define nft_trans_chain_update(trans) \ | |
1226 | (((struct nft_trans_chain *)trans->data)->update) | |
1227 | #define nft_trans_chain_name(trans) \ | |
1228 | (((struct nft_trans_chain *)trans->data)->name) | |
1229 | #define nft_trans_chain_stats(trans) \ | |
1230 | (((struct nft_trans_chain *)trans->data)->stats) | |
1231 | #define nft_trans_chain_policy(trans) \ | |
1232 | (((struct nft_trans_chain *)trans->data)->policy) | |
1233 | ||
1234 | struct nft_trans_table { | |
1235 | bool update; | |
1236 | bool enable; | |
1237 | }; | |
1238 | ||
1239 | #define nft_trans_table_update(trans) \ | |
1240 | (((struct nft_trans_table *)trans->data)->update) | |
1241 | #define nft_trans_table_enable(trans) \ | |
1242 | (((struct nft_trans_table *)trans->data)->enable) | |
1243 | ||
1244 | struct nft_trans_elem { | |
1245 | struct nft_set *set; | |
1246 | struct nft_set_elem elem; | |
1247 | }; | |
1248 | ||
1249 | #define nft_trans_elem_set(trans) \ | |
1250 | (((struct nft_trans_elem *)trans->data)->set) | |
1251 | #define nft_trans_elem(trans) \ | |
1252 | (((struct nft_trans_elem *)trans->data)->elem) | |
1253 | ||
e5009240 PNA |
1254 | struct nft_trans_obj { |
1255 | struct nft_object *obj; | |
1256 | }; | |
1257 | ||
1258 | #define nft_trans_obj(trans) \ | |
1259 | (((struct nft_trans_obj *)trans->data)->obj) | |
1260 | ||
96518518 | 1261 | #endif /* _NET_NF_TABLES_H */ |