1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_NF_TABLES_H
3 #define _NET_NF_TABLES_H
4
5 #include <linux/unaligned.h>
6 #include <linux/list.h>
7 #include <linux/netfilter.h>
8 #include <linux/netfilter/nfnetlink.h>
9 #include <linux/netfilter/nf_tables.h>
10 #include <linux/u64_stats_sync.h>
11 #include <linux/rhashtable.h>
12 #include <net/netfilter/nf_flow_table.h>
13 #include <net/netlink.h>
14 #include <net/flow_offload.h>
15 #include <net/netns/generic.h>
16
17 #define NFT_MAX_HOOKS (NF_INET_INGRESS + 1)
18
19 struct module;
20
21 #define NFT_JUMP_STACK_SIZE 16
22
23 enum {
24 NFT_PKTINFO_L4PROTO = (1 << 0),
25 NFT_PKTINFO_INNER = (1 << 1),
26 NFT_PKTINFO_INNER_FULL = (1 << 2),
27 };
28
29 struct nft_pktinfo {
30 struct sk_buff *skb;
31 const struct nf_hook_state *state;
32 u8 flags;
33 u8 tprot;
34 __be16 ethertype;
35 u16 fragoff;
36 u16 nhoff;
37 u16 thoff;
38 u16 inneroff;
39 };
40
nft_sk(const struct nft_pktinfo * pkt)41 static inline struct sock *nft_sk(const struct nft_pktinfo *pkt)
42 {
43 return pkt->state->sk;
44 }
45
nft_thoff(const struct nft_pktinfo * pkt)46 static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt)
47 {
48 return pkt->thoff;
49 }
50
nft_net(const struct nft_pktinfo * pkt)51 static inline struct net *nft_net(const struct nft_pktinfo *pkt)
52 {
53 return pkt->state->net;
54 }
55
nft_hook(const struct nft_pktinfo * pkt)56 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt)
57 {
58 return pkt->state->hook;
59 }
60
nft_pf(const struct nft_pktinfo * pkt)61 static inline u8 nft_pf(const struct nft_pktinfo *pkt)
62 {
63 return pkt->state->pf;
64 }
65
nft_in(const struct nft_pktinfo * pkt)66 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt)
67 {
68 return pkt->state->in;
69 }
70
nft_out(const struct nft_pktinfo * pkt)71 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt)
72 {
73 return pkt->state->out;
74 }
75
nft_set_pktinfo(struct nft_pktinfo * pkt,struct sk_buff * skb,const struct nf_hook_state * state)76 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
77 struct sk_buff *skb,
78 const struct nf_hook_state *state)
79 {
80 pkt->skb = skb;
81 pkt->state = state;
82 }
83
nft_set_pktinfo_unspec(struct nft_pktinfo * pkt)84 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt)
85 {
86 pkt->flags = 0;
87 pkt->tprot = 0;
88 pkt->ethertype = pkt->skb->protocol;
89 pkt->nhoff = 0;
90 pkt->thoff = 0;
91 pkt->fragoff = 0;
92 }
93
94 /**
95 * struct nft_verdict - nf_tables verdict
96 *
97 * @code: nf_tables/netfilter verdict code
98 * @chain: destination chain for NFT_JUMP/NFT_GOTO
99 */
100 struct nft_verdict {
101 u32 code;
102 struct nft_chain *chain;
103 };
104
105 struct nft_data {
106 union {
107 u32 data[4];
108 struct nft_verdict verdict;
109 };
110 } __attribute__((aligned(__alignof__(u64))));
111
112 #define NFT_REG32_NUM 20
113
114 /**
115 * struct nft_regs - nf_tables register set
116 *
117 * @data: data registers
118 * @verdict: verdict register
119 *
120 * The first four data registers alias to the verdict register.
121 */
122 struct nft_regs {
123 union {
124 u32 data[NFT_REG32_NUM];
125 struct nft_verdict verdict;
126 };
127 };
128
129 /* Store/load an u8, u16 or u64 integer to/from the u32 data register.
130 *
131 * Note, when using concatenations, register allocation happens at 32-bit
132 * level. So for store instruction, pad the rest part with zero to avoid
133 * garbage values.
134 */
135
nft_reg_store8(u32 * dreg,u8 val)136 static inline void nft_reg_store8(u32 *dreg, u8 val)
137 {
138 *dreg = 0;
139 *(u8 *)dreg = val;
140 }
141
nft_reg_load8(const u32 * sreg)142 static inline u8 nft_reg_load8(const u32 *sreg)
143 {
144 return *(u8 *)sreg;
145 }
146
nft_reg_store16(u32 * dreg,u16 val)147 static inline void nft_reg_store16(u32 *dreg, u16 val)
148 {
149 *dreg = 0;
150 *(u16 *)dreg = val;
151 }
152
nft_reg_store_be16(u32 * dreg,__be16 val)153 static inline void nft_reg_store_be16(u32 *dreg, __be16 val)
154 {
155 nft_reg_store16(dreg, (__force __u16)val);
156 }
157
nft_reg_load16(const u32 * sreg)158 static inline u16 nft_reg_load16(const u32 *sreg)
159 {
160 return *(u16 *)sreg;
161 }
162
nft_reg_load_be16(const u32 * sreg)163 static inline __be16 nft_reg_load_be16(const u32 *sreg)
164 {
165 return (__force __be16)nft_reg_load16(sreg);
166 }
167
nft_reg_load_be32(const u32 * sreg)168 static inline __be32 nft_reg_load_be32(const u32 *sreg)
169 {
170 return *(__force __be32 *)sreg;
171 }
172
nft_reg_store64(u64 * dreg,u64 val)173 static inline void nft_reg_store64(u64 *dreg, u64 val)
174 {
175 put_unaligned(val, dreg);
176 }
177
nft_reg_load64(const u32 * sreg)178 static inline u64 nft_reg_load64(const u32 *sreg)
179 {
180 return get_unaligned((u64 *)sreg);
181 }
182
nft_data_copy(u32 * dst,const struct nft_data * src,unsigned int len)183 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
184 unsigned int len)
185 {
186 if (len % NFT_REG32_SIZE)
187 dst[len / NFT_REG32_SIZE] = 0;
188 memcpy(dst, src, len);
189 }
190
191 /**
192 * struct nft_ctx - nf_tables rule/set context
193 *
194 * @net: net namespace
195 * @table: the table the chain is contained in
196 * @chain: the chain the rule is contained in
197 * @nla: netlink attributes
198 * @portid: netlink portID of the original message
199 * @seq: netlink sequence number
200 * @flags: modifiers to new request
201 * @family: protocol family
202 * @level: depth of the chains
203 * @report: notify via unicast netlink message
204 * @reg_inited: bitmap of initialised registers
205 */
206 struct nft_ctx {
207 struct net *net;
208 struct nft_table *table;
209 struct nft_chain *chain;
210 const struct nlattr * const *nla;
211 u32 portid;
212 u32 seq;
213 u16 flags;
214 u8 family;
215 u8 level;
216 bool report;
217 DECLARE_BITMAP(reg_inited, NFT_REG32_NUM);
218 };
219
220 enum nft_data_desc_flags {
221 NFT_DATA_DESC_SETELEM = (1 << 0),
222 };
223
224 struct nft_data_desc {
225 enum nft_data_types type;
226 unsigned int size;
227 unsigned int len;
228 unsigned int flags;
229 };
230
231 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
232 struct nft_data_desc *desc, const struct nlattr *nla);
233 void nft_data_hold(const struct nft_data *data, enum nft_data_types type);
234 void nft_data_release(const struct nft_data *data, enum nft_data_types type);
235 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
236 enum nft_data_types type, unsigned int len);
237
nft_dreg_to_type(enum nft_registers reg)238 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
239 {
240 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
241 }
242
nft_type_to_reg(enum nft_data_types type)243 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
244 {
245 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
246 }
247
248 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
249 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
250
251 int nft_parse_register_load(const struct nft_ctx *ctx,
252 const struct nlattr *attr, u8 *sreg, u32 len);
253 int nft_parse_register_store(const struct nft_ctx *ctx,
254 const struct nlattr *attr, u8 *dreg,
255 const struct nft_data *data,
256 enum nft_data_types type, unsigned int len);
257
258 /**
259 * struct nft_userdata - user defined data associated with an object
260 *
261 * @len: length of the data
262 * @data: content
263 *
264 * The presence of user data is indicated in an object specific fashion,
265 * so a length of zero can't occur and the value "len" indicates data
266 * of length len + 1.
267 */
268 struct nft_userdata {
269 u8 len;
270 unsigned char data[];
271 };
272
273 /* placeholder structure for opaque set element backend representation. */
274 struct nft_elem_priv { };
275
276 /**
277 * struct nft_set_elem - generic representation of set elements
278 *
279 * @key: element key
280 * @key_end: closing element key
281 * @data: element data
282 * @priv: element private data and extensions
283 */
284 struct nft_set_elem {
285 union {
286 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
287 struct nft_data val;
288 } key;
289 union {
290 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
291 struct nft_data val;
292 } key_end;
293 union {
294 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
295 struct nft_data val;
296 } data;
297 struct nft_elem_priv *priv;
298 };
299
nft_elem_priv_cast(const struct nft_elem_priv * priv)300 static inline void *nft_elem_priv_cast(const struct nft_elem_priv *priv)
301 {
302 return (void *)priv;
303 }
304
305
306 /**
307 * enum nft_iter_type - nftables set iterator type
308 *
309 * @NFT_ITER_UNSPEC: unspecified, to catch errors
310 * @NFT_ITER_READ: read-only iteration over set elements
311 * @NFT_ITER_UPDATE: iteration under mutex to update set element state
312 * @NFT_ITER_UPDATE_CLONE: clone set before iteration under mutex to update element
313 */
314 enum nft_iter_type {
315 NFT_ITER_UNSPEC,
316 NFT_ITER_READ,
317 NFT_ITER_UPDATE,
318 NFT_ITER_UPDATE_CLONE,
319 };
320
321 struct nft_set;
322 struct nft_set_iter {
323 u8 genmask;
324 enum nft_iter_type type:8;
325 unsigned int count;
326 unsigned int skip;
327 int err;
328 int (*fn)(const struct nft_ctx *ctx,
329 struct nft_set *set,
330 const struct nft_set_iter *iter,
331 struct nft_elem_priv *elem_priv);
332 };
333
334 /**
335 * struct nft_set_desc - description of set elements
336 *
337 * @ktype: key type
338 * @klen: key length
339 * @dtype: data type
340 * @dlen: data length
341 * @objtype: object type
342 * @size: number of set elements
343 * @policy: set policy
344 * @gc_int: garbage collector interval
345 * @timeout: element timeout
346 * @field_len: length of each field in concatenation, bytes
347 * @field_count: number of concatenated fields in element
348 * @expr: set must support for expressions
349 */
350 struct nft_set_desc {
351 u32 ktype;
352 unsigned int klen;
353 u32 dtype;
354 unsigned int dlen;
355 u32 objtype;
356 unsigned int size;
357 u32 policy;
358 u32 gc_int;
359 u64 timeout;
360 u8 field_len[NFT_REG32_COUNT];
361 u8 field_count;
362 bool expr;
363 };
364
365 /**
366 * enum nft_set_class - performance class
367 *
368 * @NFT_SET_CLASS_O_1: constant, O(1)
369 * @NFT_SET_CLASS_O_LOG_N: logarithmic, O(log N)
370 * @NFT_SET_CLASS_O_N: linear, O(N)
371 */
372 enum nft_set_class {
373 NFT_SET_CLASS_O_1,
374 NFT_SET_CLASS_O_LOG_N,
375 NFT_SET_CLASS_O_N,
376 };
377
378 /**
379 * struct nft_set_estimate - estimation of memory and performance
380 * characteristics
381 *
382 * @size: required memory
383 * @lookup: lookup performance class
384 * @space: memory class
385 */
386 struct nft_set_estimate {
387 u64 size;
388 enum nft_set_class lookup;
389 enum nft_set_class space;
390 };
391
392 #define NFT_EXPR_MAXATTR 16
393 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
394 ALIGN(size, __alignof__(struct nft_expr)))
395
396 /**
397 * struct nft_expr - nf_tables expression
398 *
399 * @ops: expression ops
400 * @data: expression private data
401 */
402 struct nft_expr {
403 const struct nft_expr_ops *ops;
404 unsigned char data[]
405 __attribute__((aligned(__alignof__(u64))));
406 };
407
nft_expr_priv(const struct nft_expr * expr)408 static inline void *nft_expr_priv(const struct nft_expr *expr)
409 {
410 return (void *)expr->data;
411 }
412
413 struct nft_expr_info;
414
415 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
416 struct nft_expr_info *info);
417 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp);
418 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
419 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
420 const struct nft_expr *expr, bool reset);
421
422 struct nft_set_ext;
423
424 /**
425 * struct nft_set_ops - nf_tables set operations
426 *
427 * @lookup: look up an element within the set
428 * @update: update an element if exists, add it if doesn't exist
429 * @delete: delete an element
430 * @insert: insert new element into set
431 * @activate: activate new element in the next generation
432 * @deactivate: lookup for element and deactivate it in the next generation
433 * @flush: deactivate element in the next generation
434 * @remove: remove element from set
435 * @walk: iterate over all set elements
436 * @get: get set elements
437 * @ksize: kernel set size
438 * @usize: userspace set size
439 * @adjust_maxsize: delta to adjust maximum set size
440 * @commit: commit set elements
441 * @abort: abort set elements
442 * @privsize: function to return size of set private data
443 * @estimate: estimate the required memory size and the lookup complexity class
444 * @init: initialize private data of new set instance
445 * @destroy: destroy private data of set instance
446 * @gc_init: initialize garbage collection
447 * @abort_skip_removal: skip removal of elements from abort path
448 * @elemsize: element private size
449 *
450 * Operations lookup, update and delete have simpler interfaces, are faster
451 * and currently only used in the packet path. All the rest are slower,
452 * control plane functions.
453 */
454 struct nft_set_ops {
455 const struct nft_set_ext * (*lookup)(const struct net *net,
456 const struct nft_set *set,
457 const u32 *key);
458 const struct nft_set_ext * (*update)(struct nft_set *set,
459 const u32 *key,
460 const struct nft_expr *expr,
461 struct nft_regs *regs);
462 bool (*delete)(const struct nft_set *set,
463 const u32 *key);
464
465 int (*insert)(const struct net *net,
466 const struct nft_set *set,
467 const struct nft_set_elem *elem,
468 struct nft_elem_priv **priv);
469 void (*activate)(const struct net *net,
470 const struct nft_set *set,
471 struct nft_elem_priv *elem_priv);
472 struct nft_elem_priv * (*deactivate)(const struct net *net,
473 const struct nft_set *set,
474 const struct nft_set_elem *elem);
475 void (*flush)(const struct net *net,
476 const struct nft_set *set,
477 struct nft_elem_priv *priv);
478 void (*remove)(const struct net *net,
479 const struct nft_set *set,
480 struct nft_elem_priv *elem_priv);
481 void (*walk)(const struct nft_ctx *ctx,
482 struct nft_set *set,
483 struct nft_set_iter *iter);
484 struct nft_elem_priv * (*get)(const struct net *net,
485 const struct nft_set *set,
486 const struct nft_set_elem *elem,
487 unsigned int flags);
488 u32 (*ksize)(u32 size);
489 u32 (*usize)(u32 size);
490 u32 (*adjust_maxsize)(const struct nft_set *set);
491 void (*commit)(struct nft_set *set);
492 void (*abort)(const struct nft_set *set);
493 u64 (*privsize)(const struct nlattr * const nla[],
494 const struct nft_set_desc *desc);
495 bool (*estimate)(const struct nft_set_desc *desc,
496 u32 features,
497 struct nft_set_estimate *est);
498 int (*init)(const struct nft_set *set,
499 const struct nft_set_desc *desc,
500 const struct nlattr * const nla[]);
501 void (*destroy)(const struct nft_ctx *ctx,
502 const struct nft_set *set);
503 void (*gc_init)(const struct nft_set *set);
504
505 bool abort_skip_removal;
506 unsigned int elemsize;
507 };
508
509 /**
510 * struct nft_set_type - nf_tables set type
511 *
512 * @ops: set ops for this type
513 * @features: features supported by the implementation
514 */
515 struct nft_set_type {
516 const struct nft_set_ops ops;
517 u32 features;
518 };
519 #define to_set_type(o) container_of(o, struct nft_set_type, ops)
520
521 struct nft_set_elem_expr {
522 u8 size;
523 unsigned char data[]
524 __attribute__((aligned(__alignof__(struct nft_expr))));
525 };
526
527 #define nft_setelem_expr_at(__elem_expr, __offset) \
528 ((struct nft_expr *)&__elem_expr->data[__offset])
529
530 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \
531 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \
532 __size < (__elem_expr)->size; \
533 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size)
534
535 #define NFT_SET_EXPR_MAX 2
536
537 /**
538 * struct nft_set - nf_tables set instance
539 *
540 * @list: table set list node
541 * @bindings: list of set bindings
542 * @refs: internal refcounting for async set destruction
543 * @table: table this set belongs to
544 * @net: netnamespace this set belongs to
545 * @name: name of the set
546 * @handle: unique handle of the set
547 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
548 * @dtype: data type (verdict or numeric type defined by userspace)
549 * @objtype: object type (see NFT_OBJECT_* definitions)
550 * @size: maximum set size
551 * @field_len: length of each field in concatenation, bytes
552 * @field_count: number of concatenated fields in element
553 * @in_update_walk: true during ->walk() in transaction phase
554 * @use: number of rules references to this set
555 * @nelems: number of elements
556 * @ndeact: number of deactivated elements queued for removal
557 * @timeout: default timeout value in jiffies
558 * @gc_int: garbage collection interval in msecs
559 * @policy: set parameterization (see enum nft_set_policies)
560 * @udlen: user data length
561 * @udata: user data
562 * @pending_update: list of pending update set element
563 * @ops: set ops
564 * @flags: set flags
565 * @dead: set will be freed, never cleared
566 * @genmask: generation mask
567 * @klen: key length
568 * @dlen: data length
569 * @num_exprs: numbers of exprs
570 * @exprs: stateful expression
571 * @catchall_list: list of catch-all set element
572 * @data: private set data
573 */
574 struct nft_set {
575 struct list_head list;
576 struct list_head bindings;
577 refcount_t refs;
578 struct nft_table *table;
579 possible_net_t net;
580 char *name;
581 u64 handle;
582 u32 ktype;
583 u32 dtype;
584 u32 objtype;
585 u32 size;
586 u8 field_len[NFT_REG32_COUNT];
587 u8 field_count;
588 bool in_update_walk;
589 u32 use;
590 atomic_t nelems;
591 u32 ndeact;
592 u64 timeout;
593 u32 gc_int;
594 u16 policy;
595 u16 udlen;
596 unsigned char *udata;
597 struct list_head pending_update;
598 /* runtime data below here */
599 const struct nft_set_ops *ops ____cacheline_aligned;
600 u16 flags:13,
601 dead:1,
602 genmask:2;
603 u8 klen;
604 u8 dlen;
605 u8 num_exprs;
606 struct nft_expr *exprs[NFT_SET_EXPR_MAX];
607 struct list_head catchall_list;
608 unsigned char data[]
609 __attribute__((aligned(__alignof__(u64))));
610 };
611
nft_set_is_anonymous(const struct nft_set * set)612 static inline bool nft_set_is_anonymous(const struct nft_set *set)
613 {
614 return set->flags & NFT_SET_ANONYMOUS;
615 }
616
nft_set_priv(const struct nft_set * set)617 static inline void *nft_set_priv(const struct nft_set *set)
618 {
619 return (void *)set->data;
620 }
621
nft_set_datatype(const struct nft_set * set)622 static inline enum nft_data_types nft_set_datatype(const struct nft_set *set)
623 {
624 return set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
625 }
626
nft_set_gc_is_pending(const struct nft_set * s)627 static inline bool nft_set_gc_is_pending(const struct nft_set *s)
628 {
629 return refcount_read(&s->refs) != 1;
630 }
631
nft_set_container_of(const void * priv)632 static inline struct nft_set *nft_set_container_of(const void *priv)
633 {
634 return (void *)priv - offsetof(struct nft_set, data);
635 }
636
637 struct nft_set *nft_set_lookup_global(const struct net *net,
638 const struct nft_table *table,
639 const struct nlattr *nla_set_name,
640 const struct nlattr *nla_set_id,
641 u8 genmask);
642
643 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
644 const struct nft_set *set);
645
nft_set_gc_interval(const struct nft_set * set)646 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
647 {
648 u32 gc_int = READ_ONCE(set->gc_int);
649
650 return gc_int ? msecs_to_jiffies(gc_int) : HZ;
651 }
652
653 /**
654 * struct nft_set_binding - nf_tables set binding
655 *
656 * @list: set bindings list node
657 * @chain: chain containing the rule bound to the set
658 * @flags: set action flags
659 *
660 * A set binding contains all information necessary for validation
661 * of new elements added to a bound set.
662 */
663 struct nft_set_binding {
664 struct list_head list;
665 const struct nft_chain *chain;
666 u32 flags;
667 };
668
669 enum nft_trans_phase;
670 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set);
671 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
672 struct nft_set_binding *binding,
673 enum nft_trans_phase phase);
674 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
675 struct nft_set_binding *binding);
676 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
677
678 /**
679 * enum nft_set_extensions - set extension type IDs
680 *
681 * @NFT_SET_EXT_KEY: element key
682 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges
683 * @NFT_SET_EXT_DATA: mapping data
684 * @NFT_SET_EXT_FLAGS: element flags
685 * @NFT_SET_EXT_TIMEOUT: element timeout
686 * @NFT_SET_EXT_USERDATA: user data associated with the element
687 * @NFT_SET_EXT_EXPRESSIONS: expressions associated with the element
688 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element
689 * @NFT_SET_EXT_NUM: number of extension types
690 */
691 enum nft_set_extensions {
692 NFT_SET_EXT_KEY,
693 NFT_SET_EXT_KEY_END,
694 NFT_SET_EXT_DATA,
695 NFT_SET_EXT_FLAGS,
696 NFT_SET_EXT_TIMEOUT,
697 NFT_SET_EXT_USERDATA,
698 NFT_SET_EXT_EXPRESSIONS,
699 NFT_SET_EXT_OBJREF,
700 NFT_SET_EXT_NUM
701 };
702
703 /**
704 * struct nft_set_ext_type - set extension type
705 *
706 * @len: fixed part length of the extension
707 * @align: alignment requirements of the extension
708 */
709 struct nft_set_ext_type {
710 u8 len;
711 u8 align;
712 };
713
714 extern const struct nft_set_ext_type nft_set_ext_types[];
715
716 /**
717 * struct nft_set_ext_tmpl - set extension template
718 *
719 * @len: length of extension area
720 * @offset: offsets of individual extension types
721 * @ext_len: length of the expected extension(used to sanity check)
722 */
723 struct nft_set_ext_tmpl {
724 u16 len;
725 u8 offset[NFT_SET_EXT_NUM];
726 u8 ext_len[NFT_SET_EXT_NUM];
727 };
728
729 /**
730 * struct nft_set_ext - set extensions
731 *
732 * @genmask: generation mask, but also flags (see NFT_SET_ELEM_DEAD_BIT)
733 * @offset: offsets of individual extension types
734 * @data: beginning of extension data
735 *
736 * This structure must be aligned to word size, otherwise atomic bitops
737 * on genmask field can cause alignment failure on some archs.
738 */
739 struct nft_set_ext {
740 u8 genmask;
741 u8 offset[NFT_SET_EXT_NUM];
742 char data[];
743 } __aligned(BITS_PER_LONG / 8);
744
nft_set_ext_prepare(struct nft_set_ext_tmpl * tmpl)745 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
746 {
747 memset(tmpl, 0, sizeof(*tmpl));
748 tmpl->len = sizeof(struct nft_set_ext);
749 }
750
nft_set_ext_add_length(struct nft_set_ext_tmpl * tmpl,u8 id,unsigned int len)751 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
752 unsigned int len)
753 {
754 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
755 if (tmpl->len > U8_MAX)
756 return -EINVAL;
757
758 tmpl->offset[id] = tmpl->len;
759 tmpl->ext_len[id] = nft_set_ext_types[id].len + len;
760 tmpl->len += tmpl->ext_len[id];
761
762 return 0;
763 }
764
nft_set_ext_add(struct nft_set_ext_tmpl * tmpl,u8 id)765 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
766 {
767 return nft_set_ext_add_length(tmpl, id, 0);
768 }
769
nft_set_ext_init(struct nft_set_ext * ext,const struct nft_set_ext_tmpl * tmpl)770 static inline void nft_set_ext_init(struct nft_set_ext *ext,
771 const struct nft_set_ext_tmpl *tmpl)
772 {
773 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
774 }
775
__nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)776 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
777 {
778 return !!ext->offset[id];
779 }
780
nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)781 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
782 {
783 return ext && __nft_set_ext_exists(ext, id);
784 }
785
nft_set_ext(const struct nft_set_ext * ext,u8 id)786 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
787 {
788 return (void *)ext + ext->offset[id];
789 }
790
nft_set_ext_key(const struct nft_set_ext * ext)791 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
792 {
793 return nft_set_ext(ext, NFT_SET_EXT_KEY);
794 }
795
nft_set_ext_key_end(const struct nft_set_ext * ext)796 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
797 {
798 return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
799 }
800
nft_set_ext_data(const struct nft_set_ext * ext)801 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
802 {
803 return nft_set_ext(ext, NFT_SET_EXT_DATA);
804 }
805
nft_set_ext_flags(const struct nft_set_ext * ext)806 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
807 {
808 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
809 }
810
811 struct nft_timeout {
812 u64 timeout;
813 u64 expiration;
814 };
815
nft_set_ext_timeout(const struct nft_set_ext * ext)816 static inline struct nft_timeout *nft_set_ext_timeout(const struct nft_set_ext *ext)
817 {
818 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
819 }
820
nft_set_ext_userdata(const struct nft_set_ext * ext)821 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
822 {
823 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
824 }
825
nft_set_ext_expr(const struct nft_set_ext * ext)826 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
827 {
828 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS);
829 }
830
__nft_set_elem_expired(const struct nft_set_ext * ext,u64 tstamp)831 static inline bool __nft_set_elem_expired(const struct nft_set_ext *ext,
832 u64 tstamp)
833 {
834 if (!nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) ||
835 READ_ONCE(nft_set_ext_timeout(ext)->timeout) == 0)
836 return false;
837
838 return time_after_eq64(tstamp, READ_ONCE(nft_set_ext_timeout(ext)->expiration));
839 }
840
nft_set_elem_expired(const struct nft_set_ext * ext)841 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
842 {
843 return __nft_set_elem_expired(ext, get_jiffies_64());
844 }
845
nft_set_elem_ext(const struct nft_set * set,const struct nft_elem_priv * elem_priv)846 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
847 const struct nft_elem_priv *elem_priv)
848 {
849 return (void *)elem_priv + set->ops->elemsize;
850 }
851
nft_set_ext_obj(const struct nft_set_ext * ext)852 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
853 {
854 return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
855 }
856
857 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
858 const struct nft_set *set,
859 const struct nlattr *attr);
860
861 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
862 const struct nft_set_ext_tmpl *tmpl,
863 const u32 *key, const u32 *key_end,
864 const u32 *data,
865 u64 timeout, u64 expiration, gfp_t gfp);
866 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
867 struct nft_expr *expr_array[]);
868 void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
869 struct nft_set_elem_expr *elem_expr);
870 void nft_set_elem_destroy(const struct nft_set *set,
871 const struct nft_elem_priv *elem_priv,
872 bool destroy_expr);
873 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
874 const struct nft_set *set,
875 const struct nft_elem_priv *elem_priv);
876
877 struct nft_expr_ops;
878 /**
879 * struct nft_expr_type - nf_tables expression type
880 *
881 * @select_ops: function to select nft_expr_ops
882 * @release_ops: release nft_expr_ops
883 * @ops: default ops, used when no select_ops functions is present
884 * @inner_ops: inner ops, used for inner packet operation
885 * @list: used internally
886 * @name: Identifier
887 * @owner: module reference
888 * @policy: netlink attribute policy
889 * @maxattr: highest netlink attribute number
890 * @family: address family for AF-specific types
891 * @flags: expression type flags
892 */
893 struct nft_expr_type {
894 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
895 const struct nlattr * const tb[]);
896 void (*release_ops)(const struct nft_expr_ops *ops);
897 const struct nft_expr_ops *ops;
898 const struct nft_expr_ops *inner_ops;
899 struct list_head list;
900 const char *name;
901 struct module *owner;
902 const struct nla_policy *policy;
903 unsigned int maxattr;
904 u8 family;
905 u8 flags;
906 };
907
908 #define NFT_EXPR_STATEFUL 0x1
909 #define NFT_EXPR_GC 0x2
910
911 enum nft_trans_phase {
912 NFT_TRANS_PREPARE,
913 NFT_TRANS_PREPARE_ERROR,
914 NFT_TRANS_ABORT,
915 NFT_TRANS_COMMIT,
916 NFT_TRANS_RELEASE
917 };
918
919 struct nft_flow_rule;
920 struct nft_offload_ctx;
921
922 /**
923 * struct nft_expr_ops - nf_tables expression operations
924 *
925 * @eval: Expression evaluation function
926 * @clone: Expression clone function
927 * @size: full expression size, including private data size
928 * @init: initialization function
929 * @activate: activate expression in the next generation
930 * @deactivate: deactivate expression in next generation
931 * @destroy: destruction function, called after synchronize_rcu
932 * @destroy_clone: destruction clone function
933 * @dump: function to dump parameters
934 * @validate: validate expression, called during loop detection
935 * @gc: garbage collection expression
936 * @offload: hardware offload expression
937 * @offload_action: function to report true/false to allocate one slot or not in the flow
938 * offload array
939 * @offload_stats: function to synchronize hardware stats via updating the counter expression
940 * @type: expression type
941 * @data: extra data to attach to this expression operation
942 */
943 struct nft_expr_ops {
944 void (*eval)(const struct nft_expr *expr,
945 struct nft_regs *regs,
946 const struct nft_pktinfo *pkt);
947 int (*clone)(struct nft_expr *dst,
948 const struct nft_expr *src, gfp_t gfp);
949 unsigned int size;
950
951 int (*init)(const struct nft_ctx *ctx,
952 const struct nft_expr *expr,
953 const struct nlattr * const tb[]);
954 void (*activate)(const struct nft_ctx *ctx,
955 const struct nft_expr *expr);
956 void (*deactivate)(const struct nft_ctx *ctx,
957 const struct nft_expr *expr,
958 enum nft_trans_phase phase);
959 void (*destroy)(const struct nft_ctx *ctx,
960 const struct nft_expr *expr);
961 void (*destroy_clone)(const struct nft_ctx *ctx,
962 const struct nft_expr *expr);
963 int (*dump)(struct sk_buff *skb,
964 const struct nft_expr *expr,
965 bool reset);
966 int (*validate)(const struct nft_ctx *ctx,
967 const struct nft_expr *expr);
968 bool (*gc)(struct net *net,
969 const struct nft_expr *expr);
970 int (*offload)(struct nft_offload_ctx *ctx,
971 struct nft_flow_rule *flow,
972 const struct nft_expr *expr);
973 bool (*offload_action)(const struct nft_expr *expr);
974 void (*offload_stats)(struct nft_expr *expr,
975 const struct flow_stats *stats);
976 const struct nft_expr_type *type;
977 void *data;
978 };
979
980 /**
981 * struct nft_rule - nf_tables rule
982 *
983 * @list: used internally
984 * @handle: rule handle
985 * @genmask: generation mask
986 * @dlen: length of expression data
987 * @udata: user data is appended to the rule
988 * @data: expression data
989 */
990 struct nft_rule {
991 struct list_head list;
992 u64 handle:42,
993 genmask:2,
994 dlen:12,
995 udata:1;
996 unsigned char data[]
997 __attribute__((aligned(__alignof__(struct nft_expr))));
998 };
999
nft_expr_first(const struct nft_rule * rule)1000 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
1001 {
1002 return (struct nft_expr *)&rule->data[0];
1003 }
1004
nft_expr_next(const struct nft_expr * expr)1005 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
1006 {
1007 return ((void *)expr) + expr->ops->size;
1008 }
1009
nft_expr_last(const struct nft_rule * rule)1010 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
1011 {
1012 return (struct nft_expr *)&rule->data[rule->dlen];
1013 }
1014
nft_expr_more(const struct nft_rule * rule,const struct nft_expr * expr)1015 static inline bool nft_expr_more(const struct nft_rule *rule,
1016 const struct nft_expr *expr)
1017 {
1018 return expr != nft_expr_last(rule) && expr->ops;
1019 }
1020
nft_userdata(const struct nft_rule * rule)1021 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
1022 {
1023 return (void *)&rule->data[rule->dlen];
1024 }
1025
1026 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule);
1027 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
1028 enum nft_trans_phase phase);
1029 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule);
1030
nft_set_elem_update_expr(const struct nft_set_ext * ext,struct nft_regs * regs,const struct nft_pktinfo * pkt)1031 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
1032 struct nft_regs *regs,
1033 const struct nft_pktinfo *pkt)
1034 {
1035 struct nft_set_elem_expr *elem_expr;
1036 struct nft_expr *expr;
1037 u32 size;
1038
1039 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) {
1040 elem_expr = nft_set_ext_expr(ext);
1041 nft_setelem_expr_foreach(expr, elem_expr, size) {
1042 expr->ops->eval(expr, regs, pkt);
1043 if (regs->verdict.code == NFT_BREAK)
1044 return;
1045 }
1046 }
1047 }
1048
1049 /*
1050 * The last pointer isn't really necessary, but the compiler isn't able to
1051 * determine that the result of nft_expr_last() is always the same since it
1052 * can't assume that the dlen value wasn't changed within calls in the loop.
1053 */
1054 #define nft_rule_for_each_expr(expr, last, rule) \
1055 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
1056 (expr) != (last); \
1057 (expr) = nft_expr_next(expr))
1058
1059 #define NFT_CHAIN_POLICY_UNSET U8_MAX
1060
1061 struct nft_rule_dp {
1062 u64 is_last:1,
1063 dlen:12,
1064 handle:42; /* for tracing */
1065 unsigned char data[]
1066 __attribute__((aligned(__alignof__(struct nft_expr))));
1067 };
1068
1069 struct nft_rule_dp_last {
1070 struct nft_rule_dp end; /* end of nft_rule_blob marker */
1071 struct rcu_head h; /* call_rcu head */
1072 struct nft_rule_blob *blob; /* ptr to free via call_rcu */
1073 const struct nft_chain *chain; /* for nftables tracing */
1074 };
1075
nft_rule_next(const struct nft_rule_dp * rule)1076 static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule)
1077 {
1078 return (void *)rule + sizeof(*rule) + rule->dlen;
1079 }
1080
1081 struct nft_rule_blob {
1082 unsigned long size;
1083 unsigned char data[]
1084 __attribute__((aligned(__alignof__(struct nft_rule_dp))));
1085 };
1086
1087 enum nft_chain_types {
1088 NFT_CHAIN_T_DEFAULT = 0,
1089 NFT_CHAIN_T_ROUTE,
1090 NFT_CHAIN_T_NAT,
1091 NFT_CHAIN_T_MAX
1092 };
1093
1094 /**
1095 * struct nft_chain_validate_state - validation state
1096 *
1097 * If a chain is encountered again during table validation it is
1098 * possible to avoid revalidation provided the calling context is
1099 * compatible. This structure stores relevant calling context of
1100 * previous validations.
1101 *
1102 * @hook_mask: the hook numbers and locations the chain is linked to
1103 * @depth: the deepest call chain level the chain is linked to
1104 */
1105 struct nft_chain_validate_state {
1106 u8 hook_mask[NFT_CHAIN_T_MAX];
1107 u8 depth;
1108 };
1109
1110 /**
1111 * struct nft_chain - nf_tables chain
1112 *
1113 * @blob_gen_0: rule blob pointer to the current generation
1114 * @blob_gen_1: rule blob pointer to the future generation
1115 * @rules: list of rules in the chain
1116 * @list: used internally
1117 * @rhlhead: used internally
1118 * @table: table that this chain belongs to
1119 * @handle: chain handle
1120 * @use: number of jump references to this chain
1121 * @flags: bitmask of enum NFTA_CHAIN_FLAGS
1122 * @bound: bind or not
1123 * @genmask: generation mask
1124 * @name: name of the chain
1125 * @udlen: user data length
1126 * @udata: user data in the chain
1127 * @blob_next: rule blob pointer to the next in the chain
1128 * @vstate: validation state
1129 */
1130 struct nft_chain {
1131 struct nft_rule_blob __rcu *blob_gen_0;
1132 struct nft_rule_blob __rcu *blob_gen_1;
1133 struct list_head rules;
1134 struct list_head list;
1135 struct rhlist_head rhlhead;
1136 struct nft_table *table;
1137 u64 handle;
1138 u32 use;
1139 u8 flags:5,
1140 bound:1,
1141 genmask:2;
1142 char *name;
1143 u16 udlen;
1144 u8 *udata;
1145
1146 /* Only used during control plane commit phase: */
1147 struct nft_rule_blob *blob_next;
1148 struct nft_chain_validate_state vstate;
1149 };
1150
1151 int nft_chain_validate(const struct nft_ctx *ctx, struct nft_chain *chain);
1152 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
1153 const struct nft_set_iter *iter,
1154 struct nft_elem_priv *elem_priv);
1155 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set);
1156 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1157 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1158
1159 /**
1160 * struct nft_chain_type - nf_tables chain type info
1161 *
1162 * @name: name of the type
1163 * @type: numeric identifier
1164 * @family: address family
1165 * @owner: module owner
1166 * @hook_mask: mask of valid hooks
1167 * @hooks: array of hook functions
1168 * @ops_register: base chain register function
1169 * @ops_unregister: base chain unregister function
1170 */
1171 struct nft_chain_type {
1172 const char *name;
1173 enum nft_chain_types type;
1174 int family;
1175 struct module *owner;
1176 unsigned int hook_mask;
1177 nf_hookfn *hooks[NFT_MAX_HOOKS];
1178 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
1179 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
1180 };
1181
1182 int nft_chain_validate_dependency(const struct nft_chain *chain,
1183 enum nft_chain_types type);
1184 int nft_chain_validate_hooks(const struct nft_chain *chain,
1185 unsigned int hook_flags);
1186
nft_chain_binding(const struct nft_chain * chain)1187 static inline bool nft_chain_binding(const struct nft_chain *chain)
1188 {
1189 return chain->flags & NFT_CHAIN_BINDING;
1190 }
1191
nft_chain_is_bound(struct nft_chain * chain)1192 static inline bool nft_chain_is_bound(struct nft_chain *chain)
1193 {
1194 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
1195 }
1196
1197 int nft_chain_add(struct nft_table *table, struct nft_chain *chain);
1198 void nft_chain_del(struct nft_chain *chain);
1199 void nf_tables_chain_destroy(struct nft_chain *chain);
1200
1201 struct nft_stats {
1202 u64 bytes;
1203 u64 pkts;
1204 struct u64_stats_sync syncp;
1205 };
1206
1207 struct nft_hook {
1208 struct list_head list;
1209 struct list_head ops_list;
1210 struct rcu_head rcu;
1211 char ifname[IFNAMSIZ];
1212 u8 ifnamelen;
1213 };
1214
1215 struct nf_hook_ops *nft_hook_find_ops(const struct nft_hook *hook,
1216 const struct net_device *dev);
1217 struct nf_hook_ops *nft_hook_find_ops_rcu(const struct nft_hook *hook,
1218 const struct net_device *dev);
1219
1220 /**
1221 * struct nft_base_chain - nf_tables base chain
1222 *
1223 * @ops: netfilter hook ops
1224 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
1225 * @type: chain type
1226 * @policy: default policy
1227 * @flags: indicate the base chain disabled or not
1228 * @stats: per-cpu chain stats
1229 * @chain: the chain
1230 * @flow_block: flow block (for hardware offload)
1231 */
1232 struct nft_base_chain {
1233 struct nf_hook_ops ops;
1234 struct list_head hook_list;
1235 const struct nft_chain_type *type;
1236 u8 policy;
1237 u8 flags;
1238 struct nft_stats __percpu *stats;
1239 struct nft_chain chain;
1240 struct flow_block flow_block;
1241 };
1242
nft_base_chain(const struct nft_chain * chain)1243 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
1244 {
1245 return container_of(chain, struct nft_base_chain, chain);
1246 }
1247
nft_is_base_chain(const struct nft_chain * chain)1248 static inline bool nft_is_base_chain(const struct nft_chain *chain)
1249 {
1250 return chain->flags & NFT_CHAIN_BASE;
1251 }
1252
1253 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
1254
nft_use_inc(u32 * use)1255 static inline bool nft_use_inc(u32 *use)
1256 {
1257 if (*use == UINT_MAX)
1258 return false;
1259
1260 (*use)++;
1261
1262 return true;
1263 }
1264
nft_use_dec(u32 * use)1265 static inline void nft_use_dec(u32 *use)
1266 {
1267 WARN_ON_ONCE((*use)-- == 0);
1268 }
1269
1270 /* For error and abort path: restore use counter to previous state. */
nft_use_inc_restore(u32 * use)1271 static inline void nft_use_inc_restore(u32 *use)
1272 {
1273 WARN_ON_ONCE(!nft_use_inc(use));
1274 }
1275
1276 #define nft_use_dec_restore nft_use_dec
1277
1278 /**
1279 * struct nft_table - nf_tables table
1280 *
1281 * @list: used internally
1282 * @chains_ht: chains in the table
1283 * @chains: same, for stable walks
1284 * @sets: sets in the table
1285 * @objects: stateful objects in the table
1286 * @flowtables: flow tables in the table
1287 * @hgenerator: handle generator state
1288 * @handle: table handle
1289 * @use: number of chain references to this table
1290 * @family:address family
1291 * @flags: table flag (see enum nft_table_flags)
1292 * @genmask: generation mask
1293 * @nlpid: netlink port ID
1294 * @name: name of the table
1295 * @udlen: length of the user data
1296 * @udata: user data
1297 * @validate_state: internal, set when transaction adds jumps
1298 */
1299 struct nft_table {
1300 struct list_head list;
1301 struct rhltable chains_ht;
1302 struct list_head chains;
1303 struct list_head sets;
1304 struct list_head objects;
1305 struct list_head flowtables;
1306 u64 hgenerator;
1307 u64 handle;
1308 u32 use;
1309 u16 family:6,
1310 flags:8,
1311 genmask:2;
1312 u32 nlpid;
1313 char *name;
1314 u16 udlen;
1315 u8 *udata;
1316 u8 validate_state;
1317 };
1318
nft_table_has_owner(const struct nft_table * table)1319 static inline bool nft_table_has_owner(const struct nft_table *table)
1320 {
1321 return table->flags & NFT_TABLE_F_OWNER;
1322 }
1323
nft_table_is_orphan(const struct nft_table * table)1324 static inline bool nft_table_is_orphan(const struct nft_table *table)
1325 {
1326 return (table->flags & (NFT_TABLE_F_OWNER | NFT_TABLE_F_PERSIST)) ==
1327 NFT_TABLE_F_PERSIST;
1328 }
1329
nft_base_chain_netdev(int family,u32 hooknum)1330 static inline bool nft_base_chain_netdev(int family, u32 hooknum)
1331 {
1332 return family == NFPROTO_NETDEV ||
1333 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
1334 }
1335
1336 void nft_register_chain_type(const struct nft_chain_type *);
1337 void nft_unregister_chain_type(const struct nft_chain_type *);
1338
1339 int nft_register_expr(struct nft_expr_type *);
1340 void nft_unregister_expr(struct nft_expr_type *);
1341
1342 int nft_verdict_dump(struct sk_buff *skb, int type,
1343 const struct nft_verdict *v);
1344
1345 /**
1346 * struct nft_object_hash_key - key to lookup nft_object
1347 *
1348 * @name: name of the stateful object to look up
1349 * @table: table the object belongs to
1350 */
1351 struct nft_object_hash_key {
1352 const char *name;
1353 const struct nft_table *table;
1354 };
1355
1356 /**
1357 * struct nft_object - nf_tables stateful object
1358 *
1359 * @list: table stateful object list node
1360 * @rhlhead: nft_objname_ht node
1361 * @key: keys that identify this object
1362 * @genmask: generation mask
1363 * @use: number of references to this stateful object
1364 * @handle: unique object handle
1365 * @udlen: length of user data
1366 * @udata: user data
1367 * @ops: object operations
1368 * @data: object data, layout depends on type
1369 */
1370 struct nft_object {
1371 struct list_head list;
1372 struct rhlist_head rhlhead;
1373 struct nft_object_hash_key key;
1374 u32 genmask:2;
1375 u32 use;
1376 u64 handle;
1377 u16 udlen;
1378 u8 *udata;
1379 /* runtime data below here */
1380 const struct nft_object_ops *ops ____cacheline_aligned;
1381 unsigned char data[]
1382 __attribute__((aligned(__alignof__(u64))));
1383 };
1384
nft_obj_data(const struct nft_object * obj)1385 static inline void *nft_obj_data(const struct nft_object *obj)
1386 {
1387 return (void *)obj->data;
1388 }
1389
1390 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
1391
1392 struct nft_object *nft_obj_lookup(const struct net *net,
1393 const struct nft_table *table,
1394 const struct nlattr *nla, u32 objtype,
1395 u8 genmask);
1396
1397 void nft_obj_notify(struct net *net, const struct nft_table *table,
1398 struct nft_object *obj, u32 portid, u32 seq,
1399 int event, u16 flags, int family, int report, gfp_t gfp);
1400
1401 /**
1402 * struct nft_object_type - stateful object type
1403 *
1404 * @select_ops: function to select nft_object_ops
1405 * @ops: default ops, used when no select_ops functions is present
1406 * @list: list node in list of object types
1407 * @type: stateful object numeric type
1408 * @owner: module owner
1409 * @maxattr: maximum netlink attribute
1410 * @family: address family for AF-specific object types
1411 * @policy: netlink attribute policy
1412 */
1413 struct nft_object_type {
1414 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
1415 const struct nlattr * const tb[]);
1416 const struct nft_object_ops *ops;
1417 struct list_head list;
1418 u32 type;
1419 unsigned int maxattr;
1420 u8 family;
1421 struct module *owner;
1422 const struct nla_policy *policy;
1423 };
1424
1425 /**
1426 * struct nft_object_ops - stateful object operations
1427 *
1428 * @eval: stateful object evaluation function
1429 * @size: stateful object size
1430 * @init: initialize object from netlink attributes
1431 * @destroy: release existing stateful object
1432 * @dump: netlink dump stateful object
1433 * @update: update stateful object
1434 * @type: pointer to object type
1435 */
1436 struct nft_object_ops {
1437 void (*eval)(struct nft_object *obj,
1438 struct nft_regs *regs,
1439 const struct nft_pktinfo *pkt);
1440 unsigned int size;
1441 int (*init)(const struct nft_ctx *ctx,
1442 const struct nlattr *const tb[],
1443 struct nft_object *obj);
1444 void (*destroy)(const struct nft_ctx *ctx,
1445 struct nft_object *obj);
1446 int (*dump)(struct sk_buff *skb,
1447 struct nft_object *obj,
1448 bool reset);
1449 void (*update)(struct nft_object *obj,
1450 struct nft_object *newobj);
1451 const struct nft_object_type *type;
1452 };
1453
1454 int nft_register_obj(struct nft_object_type *obj_type);
1455 void nft_unregister_obj(struct nft_object_type *obj_type);
1456
1457 #define NFT_NETDEVICE_MAX 256
1458
1459 /**
1460 * struct nft_flowtable - nf_tables flow table
1461 *
1462 * @list: flow table list node in table list
1463 * @table: the table the flow table is contained in
1464 * @name: name of this flow table
1465 * @hooknum: hook number
1466 * @ops_len: number of hooks in array
1467 * @genmask: generation mask
1468 * @use: number of references to this flow table
1469 * @handle: unique object handle
1470 * @hook_list: hook list for hooks per net_device in flowtables
1471 * @data: rhashtable and garbage collector
1472 */
1473 struct nft_flowtable {
1474 struct list_head list;
1475 struct nft_table *table;
1476 char *name;
1477 int hooknum;
1478 int ops_len;
1479 u32 genmask:2;
1480 u32 use;
1481 u64 handle;
1482 /* runtime data below here */
1483 struct list_head hook_list ____cacheline_aligned;
1484 struct nf_flowtable data;
1485 };
1486
1487 struct nft_flowtable *nft_flowtable_lookup(const struct net *net,
1488 const struct nft_table *table,
1489 const struct nlattr *nla,
1490 u8 genmask);
1491
1492 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
1493 struct nft_flowtable *flowtable,
1494 enum nft_trans_phase phase);
1495
1496 void nft_register_flowtable_type(struct nf_flowtable_type *type);
1497 void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
1498
1499 /**
1500 * struct nft_traceinfo - nft tracing information and state
1501 *
1502 * @trace: other struct members are initialised
1503 * @nf_trace: copy of skb->nf_trace before rule evaluation
1504 * @type: event type (enum nft_trace_types)
1505 * @skbid: hash of skb to be used as trace id
1506 * @packet_dumped: packet headers sent in a previous traceinfo message
1507 * @basechain: base chain currently processed
1508 */
1509 struct nft_traceinfo {
1510 bool trace;
1511 bool nf_trace;
1512 bool packet_dumped;
1513 enum nft_trace_types type:8;
1514 u32 skbid;
1515 const struct nft_base_chain *basechain;
1516 };
1517
1518 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
1519 const struct nft_chain *basechain);
1520
1521 void nft_trace_notify(const struct nft_pktinfo *pkt,
1522 const struct nft_verdict *verdict,
1523 const struct nft_rule_dp *rule,
1524 struct nft_traceinfo *info);
1525
1526 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1527 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1528
1529 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1530 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1531
1532 #define MODULE_ALIAS_NFT_EXPR(name) \
1533 MODULE_ALIAS("nft-expr-" name)
1534
1535 #define MODULE_ALIAS_NFT_OBJ(type) \
1536 MODULE_ALIAS("nft-obj-" __stringify(type))
1537
1538 #if IS_ENABLED(CONFIG_NF_TABLES)
1539
1540 /*
1541 * The gencursor defines two generations, the currently active and the
1542 * next one. Objects contain a bitmask of 2 bits specifying the generations
1543 * they're active in. A set bit means they're inactive in the generation
1544 * represented by that bit.
1545 *
1546 * New objects start out as inactive in the current and active in the
1547 * next generation. When committing the ruleset the bitmask is cleared,
1548 * meaning they're active in all generations. When removing an object,
1549 * it is set inactive in the next generation. After committing the ruleset,
1550 * the objects are removed.
1551 */
nft_gencursor_next(const struct net * net)1552 static inline unsigned int nft_gencursor_next(const struct net *net)
1553 {
1554 return net->nft.gencursor + 1 == 1 ? 1 : 0;
1555 }
1556
nft_genmask_next(const struct net * net)1557 static inline u8 nft_genmask_next(const struct net *net)
1558 {
1559 return 1 << nft_gencursor_next(net);
1560 }
1561
nft_genmask_cur(const struct net * net)1562 static inline u8 nft_genmask_cur(const struct net *net)
1563 {
1564 /* Use READ_ONCE() to prevent refetching the value for atomicity */
1565 return 1 << READ_ONCE(net->nft.gencursor);
1566 }
1567
1568 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
1569
1570 /*
1571 * Generic transaction helpers
1572 */
1573
1574 /* Check if this object is currently active. */
1575 #define nft_is_active(__net, __obj) \
1576 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1577
1578 /* Check if this object is active in the next generation. */
1579 #define nft_is_active_next(__net, __obj) \
1580 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1581
1582 /* This object becomes active in the next generation. */
1583 #define nft_activate_next(__net, __obj) \
1584 (__obj)->genmask = nft_genmask_cur(__net)
1585
1586 /* This object becomes inactive in the next generation. */
1587 #define nft_deactivate_next(__net, __obj) \
1588 (__obj)->genmask = nft_genmask_next(__net)
1589
1590 /* After committing the ruleset, clear the stale generation bit. */
1591 #define nft_clear(__net, __obj) \
1592 (__obj)->genmask &= ~nft_genmask_next(__net)
1593 #define nft_active_genmask(__obj, __genmask) \
1594 !((__obj)->genmask & __genmask)
1595
1596 /*
1597 * Set element transaction helpers
1598 */
1599
nft_set_elem_active(const struct nft_set_ext * ext,u8 genmask)1600 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1601 u8 genmask)
1602 {
1603 return !(ext->genmask & genmask);
1604 }
1605
nft_set_elem_change_active(const struct net * net,const struct nft_set * set,struct nft_set_ext * ext)1606 static inline void nft_set_elem_change_active(const struct net *net,
1607 const struct nft_set *set,
1608 struct nft_set_ext *ext)
1609 {
1610 ext->genmask ^= nft_genmask_next(net);
1611 }
1612
1613 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */
1614
1615 #define NFT_SET_ELEM_DEAD_MASK (1 << 2)
1616
1617 #if defined(__LITTLE_ENDIAN_BITFIELD)
1618 #define NFT_SET_ELEM_DEAD_BIT 2
1619 #elif defined(__BIG_ENDIAN_BITFIELD)
1620 #define NFT_SET_ELEM_DEAD_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1621 #else
1622 #error
1623 #endif
1624
nft_set_elem_dead(struct nft_set_ext * ext)1625 static inline void nft_set_elem_dead(struct nft_set_ext *ext)
1626 {
1627 unsigned long *word = (unsigned long *)ext;
1628
1629 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1630 set_bit(NFT_SET_ELEM_DEAD_BIT, word);
1631 }
1632
nft_set_elem_is_dead(const struct nft_set_ext * ext)1633 static inline int nft_set_elem_is_dead(const struct nft_set_ext *ext)
1634 {
1635 unsigned long *word = (unsigned long *)ext;
1636
1637 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1638 return test_bit(NFT_SET_ELEM_DEAD_BIT, word);
1639 }
1640
1641 /**
1642 * struct nft_trans - nf_tables object update in transaction
1643 *
1644 * @list: used internally
1645 * @net: struct net
1646 * @table: struct nft_table the object resides in
1647 * @msg_type: message type
1648 * @seq: netlink sequence number
1649 * @flags: modifiers to new request
1650 * @report: notify via unicast netlink message
1651 * @put_net: net needs to be put
1652 *
1653 * This is the information common to all objects in the transaction,
1654 * this must always be the first member of derived sub-types.
1655 */
1656 struct nft_trans {
1657 struct list_head list;
1658 struct net *net;
1659 struct nft_table *table;
1660 int msg_type;
1661 u32 seq;
1662 u16 flags;
1663 u8 report:1;
1664 u8 put_net:1;
1665 };
1666
1667 /**
1668 * struct nft_trans_binding - nf_tables object with binding support in transaction
1669 * @nft_trans: base structure, MUST be first member
1670 * @binding_list: list of objects with possible bindings
1671 *
1672 * This is the base type used by objects that can be bound to a chain.
1673 */
1674 struct nft_trans_binding {
1675 struct nft_trans nft_trans;
1676 struct list_head binding_list;
1677 };
1678
1679 struct nft_trans_rule {
1680 struct nft_trans nft_trans;
1681 struct nft_rule *rule;
1682 struct nft_chain *chain;
1683 struct nft_flow_rule *flow;
1684 u32 rule_id;
1685 bool bound;
1686 };
1687
1688 #define nft_trans_container_rule(trans) \
1689 container_of(trans, struct nft_trans_rule, nft_trans)
1690 #define nft_trans_rule(trans) \
1691 nft_trans_container_rule(trans)->rule
1692 #define nft_trans_flow_rule(trans) \
1693 nft_trans_container_rule(trans)->flow
1694 #define nft_trans_rule_id(trans) \
1695 nft_trans_container_rule(trans)->rule_id
1696 #define nft_trans_rule_bound(trans) \
1697 nft_trans_container_rule(trans)->bound
1698 #define nft_trans_rule_chain(trans) \
1699 nft_trans_container_rule(trans)->chain
1700
1701 struct nft_trans_set {
1702 struct nft_trans_binding nft_trans_binding;
1703 struct list_head list_trans_newset;
1704 struct nft_set *set;
1705 u32 set_id;
1706 u32 gc_int;
1707 u64 timeout;
1708 bool update;
1709 bool bound;
1710 u32 size;
1711 };
1712
1713 #define nft_trans_container_set(t) \
1714 container_of(t, struct nft_trans_set, nft_trans_binding.nft_trans)
1715 #define nft_trans_set(trans) \
1716 nft_trans_container_set(trans)->set
1717 #define nft_trans_set_id(trans) \
1718 nft_trans_container_set(trans)->set_id
1719 #define nft_trans_set_bound(trans) \
1720 nft_trans_container_set(trans)->bound
1721 #define nft_trans_set_update(trans) \
1722 nft_trans_container_set(trans)->update
1723 #define nft_trans_set_timeout(trans) \
1724 nft_trans_container_set(trans)->timeout
1725 #define nft_trans_set_gc_int(trans) \
1726 nft_trans_container_set(trans)->gc_int
1727 #define nft_trans_set_size(trans) \
1728 nft_trans_container_set(trans)->size
1729
1730 struct nft_trans_chain {
1731 struct nft_trans_binding nft_trans_binding;
1732 struct nft_chain *chain;
1733 char *name;
1734 struct nft_stats __percpu *stats;
1735 u8 policy;
1736 bool update;
1737 bool bound;
1738 u32 chain_id;
1739 struct nft_base_chain *basechain;
1740 struct list_head hook_list;
1741 };
1742
1743 #define nft_trans_container_chain(t) \
1744 container_of(t, struct nft_trans_chain, nft_trans_binding.nft_trans)
1745 #define nft_trans_chain(trans) \
1746 nft_trans_container_chain(trans)->chain
1747 #define nft_trans_chain_update(trans) \
1748 nft_trans_container_chain(trans)->update
1749 #define nft_trans_chain_name(trans) \
1750 nft_trans_container_chain(trans)->name
1751 #define nft_trans_chain_stats(trans) \
1752 nft_trans_container_chain(trans)->stats
1753 #define nft_trans_chain_policy(trans) \
1754 nft_trans_container_chain(trans)->policy
1755 #define nft_trans_chain_bound(trans) \
1756 nft_trans_container_chain(trans)->bound
1757 #define nft_trans_chain_id(trans) \
1758 nft_trans_container_chain(trans)->chain_id
1759 #define nft_trans_basechain(trans) \
1760 nft_trans_container_chain(trans)->basechain
1761 #define nft_trans_chain_hooks(trans) \
1762 nft_trans_container_chain(trans)->hook_list
1763
1764 struct nft_trans_table {
1765 struct nft_trans nft_trans;
1766 bool update;
1767 };
1768
1769 #define nft_trans_container_table(trans) \
1770 container_of(trans, struct nft_trans_table, nft_trans)
1771 #define nft_trans_table_update(trans) \
1772 nft_trans_container_table(trans)->update
1773
1774 enum nft_trans_elem_flags {
1775 NFT_TRANS_UPD_TIMEOUT = (1 << 0),
1776 NFT_TRANS_UPD_EXPIRATION = (1 << 1),
1777 };
1778
1779 struct nft_elem_update {
1780 u64 timeout;
1781 u64 expiration;
1782 u8 flags;
1783 };
1784
1785 struct nft_trans_one_elem {
1786 struct nft_elem_priv *priv;
1787 struct nft_elem_update *update;
1788 };
1789
1790 struct nft_trans_elem {
1791 struct nft_trans nft_trans;
1792 struct nft_set *set;
1793 bool bound;
1794 unsigned int nelems;
1795 struct nft_trans_one_elem elems[] __counted_by(nelems);
1796 };
1797
1798 #define nft_trans_container_elem(t) \
1799 container_of(t, struct nft_trans_elem, nft_trans)
1800 #define nft_trans_elem_set(trans) \
1801 nft_trans_container_elem(trans)->set
1802 #define nft_trans_elem_set_bound(trans) \
1803 nft_trans_container_elem(trans)->bound
1804
1805 struct nft_trans_obj {
1806 struct nft_trans nft_trans;
1807 struct nft_object *obj;
1808 struct nft_object *newobj;
1809 bool update;
1810 };
1811
1812 #define nft_trans_container_obj(t) \
1813 container_of(t, struct nft_trans_obj, nft_trans)
1814 #define nft_trans_obj(trans) \
1815 nft_trans_container_obj(trans)->obj
1816 #define nft_trans_obj_newobj(trans) \
1817 nft_trans_container_obj(trans)->newobj
1818 #define nft_trans_obj_update(trans) \
1819 nft_trans_container_obj(trans)->update
1820
1821 struct nft_trans_flowtable {
1822 struct nft_trans nft_trans;
1823 struct nft_flowtable *flowtable;
1824 struct list_head hook_list;
1825 u32 flags;
1826 bool update;
1827 };
1828
1829 #define nft_trans_container_flowtable(t) \
1830 container_of(t, struct nft_trans_flowtable, nft_trans)
1831 #define nft_trans_flowtable(trans) \
1832 nft_trans_container_flowtable(trans)->flowtable
1833 #define nft_trans_flowtable_update(trans) \
1834 nft_trans_container_flowtable(trans)->update
1835 #define nft_trans_flowtable_hooks(trans) \
1836 nft_trans_container_flowtable(trans)->hook_list
1837 #define nft_trans_flowtable_flags(trans) \
1838 nft_trans_container_flowtable(trans)->flags
1839
1840 #define NFT_TRANS_GC_BATCHCOUNT 256
1841
1842 struct nft_trans_gc {
1843 struct list_head list;
1844 struct net *net;
1845 struct nft_set *set;
1846 u32 seq;
1847 u16 count;
1848 struct nft_elem_priv *priv[NFT_TRANS_GC_BATCHCOUNT];
1849 struct rcu_head rcu;
1850 };
1851
nft_trans_gc_space(const struct nft_trans_gc * trans)1852 static inline int nft_trans_gc_space(const struct nft_trans_gc *trans)
1853 {
1854 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
1855 }
1856
nft_ctx_update(struct nft_ctx * ctx,const struct nft_trans * trans)1857 static inline void nft_ctx_update(struct nft_ctx *ctx,
1858 const struct nft_trans *trans)
1859 {
1860 switch (trans->msg_type) {
1861 case NFT_MSG_NEWRULE:
1862 case NFT_MSG_DELRULE:
1863 case NFT_MSG_DESTROYRULE:
1864 ctx->chain = nft_trans_rule_chain(trans);
1865 break;
1866 case NFT_MSG_NEWCHAIN:
1867 case NFT_MSG_DELCHAIN:
1868 case NFT_MSG_DESTROYCHAIN:
1869 ctx->chain = nft_trans_chain(trans);
1870 break;
1871 default:
1872 ctx->chain = NULL;
1873 break;
1874 }
1875
1876 ctx->net = trans->net;
1877 ctx->table = trans->table;
1878 ctx->family = trans->table->family;
1879 ctx->report = trans->report;
1880 ctx->flags = trans->flags;
1881 ctx->seq = trans->seq;
1882 }
1883
1884 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
1885 unsigned int gc_seq, gfp_t gfp);
1886 void nft_trans_gc_destroy(struct nft_trans_gc *trans);
1887
1888 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
1889 unsigned int gc_seq, gfp_t gfp);
1890 void nft_trans_gc_queue_async_done(struct nft_trans_gc *gc);
1891
1892 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp);
1893 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans);
1894
1895 void nft_trans_gc_elem_add(struct nft_trans_gc *gc, void *priv);
1896
1897 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
1898 unsigned int gc_seq);
1899 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc);
1900
1901 void nft_setelem_data_deactivate(const struct net *net,
1902 const struct nft_set *set,
1903 struct nft_elem_priv *elem_priv);
1904
1905 int __init nft_chain_filter_init(void);
1906 void nft_chain_filter_fini(void);
1907
1908 void __init nft_chain_route_init(void);
1909 void nft_chain_route_fini(void);
1910
1911 void nf_tables_trans_destroy_flush_work(struct net *net);
1912
1913 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
1914 __be64 nf_jiffies64_to_msecs(u64 input);
1915
1916 #ifdef CONFIG_MODULES
1917 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
1918 #else
nft_request_module(struct net * net,const char * fmt,...)1919 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
1920 #endif
1921
1922 struct nftables_pernet {
1923 struct list_head tables;
1924 struct list_head commit_list;
1925 struct list_head destroy_list;
1926 struct list_head commit_set_list;
1927 struct list_head binding_list;
1928 struct list_head module_list;
1929 struct list_head notify_list;
1930 struct mutex commit_mutex;
1931 u64 table_handle;
1932 u64 tstamp;
1933 unsigned int gc_seq;
1934 u8 validate_state;
1935 struct work_struct destroy_work;
1936 };
1937
1938 extern unsigned int nf_tables_net_id;
1939
nft_pernet(const struct net * net)1940 static inline struct nftables_pernet *nft_pernet(const struct net *net)
1941 {
1942 return net_generic(net, nf_tables_net_id);
1943 }
1944
nft_net_tstamp(const struct net * net)1945 static inline u64 nft_net_tstamp(const struct net *net)
1946 {
1947 return nft_pernet(net)->tstamp;
1948 }
1949
1950 #endif /* _NET_NF_TABLES_H */
1951