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_reg_overlap(u8 src,u8 dst,u32 len)183 static inline bool nft_reg_overlap(u8 src, u8 dst, u32 len)
184 {
185 unsigned int n = DIV_ROUND_UP(len, sizeof(u32));
186
187 return src != dst && src < dst + n && dst < src + n;
188 }
189
nft_data_copy(u32 * dst,const struct nft_data * src,unsigned int len)190 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
191 unsigned int len)
192 {
193 if (len % NFT_REG32_SIZE)
194 dst[len / NFT_REG32_SIZE] = 0;
195 memcpy(dst, src, len);
196 }
197
198 /**
199 * struct nft_ctx - nf_tables rule/set context
200 *
201 * @net: net namespace
202 * @table: the table the chain is contained in
203 * @chain: the chain the rule is contained in
204 * @nla: netlink attributes
205 * @portid: netlink portID of the original message
206 * @seq: netlink sequence number
207 * @flags: modifiers to new request
208 * @family: protocol family
209 * @level: depth of the chains
210 * @report: notify via unicast netlink message
211 * @reg_inited: bitmap of initialised registers
212 */
213 struct nft_ctx {
214 struct net *net;
215 struct nft_table *table;
216 struct nft_chain *chain;
217 const struct nlattr * const *nla;
218 u32 portid;
219 u32 seq;
220 u16 flags;
221 u8 family;
222 u8 level;
223 bool report;
224 DECLARE_BITMAP(reg_inited, NFT_REG32_NUM);
225 };
226
227 enum nft_data_desc_flags {
228 NFT_DATA_DESC_SETELEM = (1 << 0),
229 };
230
231 struct nft_data_desc {
232 enum nft_data_types type;
233 unsigned int size;
234 unsigned int len;
235 unsigned int flags;
236 };
237
238 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
239 struct nft_data_desc *desc, const struct nlattr *nla);
240 void nft_data_hold(const struct nft_data *data, enum nft_data_types type);
241 void nft_data_release(const struct nft_data *data, enum nft_data_types type);
242 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
243 enum nft_data_types type, unsigned int len);
244
nft_dreg_to_type(enum nft_registers reg)245 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
246 {
247 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
248 }
249
nft_type_to_reg(enum nft_data_types type)250 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
251 {
252 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
253 }
254
255 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
256 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
257
258 int nft_parse_register_load(const struct nft_ctx *ctx,
259 const struct nlattr *attr, u8 *sreg, u32 len);
260 int nft_parse_register_store(const struct nft_ctx *ctx,
261 const struct nlattr *attr, u8 *dreg,
262 const struct nft_data *data,
263 enum nft_data_types type, unsigned int len);
264
265 /**
266 * struct nft_userdata - user defined data associated with an object
267 *
268 * @len: length of the data
269 * @data: content
270 *
271 * The presence of user data is indicated in an object specific fashion,
272 * so a length of zero can't occur and the value "len" indicates data
273 * of length len + 1.
274 */
275 struct nft_userdata {
276 u8 len;
277 unsigned char data[];
278 };
279
280 /* placeholder structure for opaque set element backend representation. */
281 struct nft_elem_priv { };
282
283 /**
284 * struct nft_set_elem - generic representation of set elements
285 *
286 * @key: element key
287 * @key_end: closing element key
288 * @data: element data
289 * @priv: element private data and extensions
290 */
291 struct nft_set_elem {
292 union {
293 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
294 struct nft_data val;
295 } key;
296 union {
297 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
298 struct nft_data val;
299 } key_end;
300 union {
301 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
302 struct nft_data val;
303 } data;
304 struct nft_elem_priv *priv;
305 };
306
nft_elem_priv_cast(const struct nft_elem_priv * priv)307 static inline void *nft_elem_priv_cast(const struct nft_elem_priv *priv)
308 {
309 return (void *)priv;
310 }
311
312
313 /**
314 * enum nft_iter_type - nftables set iterator type
315 *
316 * @NFT_ITER_UNSPEC: unspecified, to catch errors
317 * @NFT_ITER_READ: read-only iteration over set elements
318 * @NFT_ITER_UPDATE: iteration under mutex to update set element state
319 * @NFT_ITER_UPDATE_CLONE: clone set before iteration under mutex to update element
320 */
321 enum nft_iter_type {
322 NFT_ITER_UNSPEC,
323 NFT_ITER_READ,
324 NFT_ITER_UPDATE,
325 NFT_ITER_UPDATE_CLONE,
326 };
327
328 struct nft_set;
329 struct nft_set_iter {
330 u8 genmask;
331 enum nft_iter_type type:8;
332 unsigned int count;
333 unsigned int skip;
334 int err;
335 int (*fn)(const struct nft_ctx *ctx,
336 struct nft_set *set,
337 const struct nft_set_iter *iter,
338 struct nft_elem_priv *elem_priv);
339 };
340
341 /**
342 * struct nft_set_desc - description of set elements
343 *
344 * @ktype: key type
345 * @klen: key length
346 * @dtype: data type
347 * @dlen: data length
348 * @objtype: object type
349 * @size: number of set elements
350 * @policy: set policy
351 * @gc_int: garbage collector interval
352 * @timeout: element timeout
353 * @field_len: length of each field in concatenation, bytes
354 * @field_count: number of concatenated fields in element
355 * @expr: set must support for expressions
356 */
357 struct nft_set_desc {
358 u32 ktype;
359 unsigned int klen;
360 u32 dtype;
361 unsigned int dlen;
362 u32 objtype;
363 unsigned int size;
364 u32 policy;
365 u32 gc_int;
366 u64 timeout;
367 u8 field_len[NFT_REG32_COUNT];
368 u8 field_count;
369 bool expr;
370 };
371
372 /**
373 * enum nft_set_class - performance class
374 *
375 * @NFT_SET_CLASS_O_1: constant, O(1)
376 * @NFT_SET_CLASS_O_LOG_N: logarithmic, O(log N)
377 * @NFT_SET_CLASS_O_N: linear, O(N)
378 */
379 enum nft_set_class {
380 NFT_SET_CLASS_O_1,
381 NFT_SET_CLASS_O_LOG_N,
382 NFT_SET_CLASS_O_N,
383 };
384
385 /**
386 * struct nft_set_estimate - estimation of memory and performance
387 * characteristics
388 *
389 * @size: required memory
390 * @lookup: lookup performance class
391 * @space: memory class
392 */
393 struct nft_set_estimate {
394 u64 size;
395 enum nft_set_class lookup;
396 enum nft_set_class space;
397 };
398
399 #define NFT_EXPR_MAXATTR 16
400 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
401 ALIGN(size, __alignof__(struct nft_expr)))
402
403 /**
404 * struct nft_expr - nf_tables expression
405 *
406 * @ops: expression ops
407 * @data: expression private data
408 */
409 struct nft_expr {
410 const struct nft_expr_ops *ops;
411 unsigned char data[]
412 __attribute__((aligned(__alignof__(u64))));
413 };
414
nft_expr_priv(const struct nft_expr * expr)415 static inline void *nft_expr_priv(const struct nft_expr *expr)
416 {
417 return (void *)expr->data;
418 }
419
420 struct nft_expr_info;
421
422 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
423 struct nft_expr_info *info);
424 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp);
425 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
426 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
427 const struct nft_expr *expr, bool reset);
428
429 struct nft_set_ext;
430
431 /**
432 * struct nft_set_ops - nf_tables set operations
433 *
434 * @lookup: look up an element within the set
435 * @update: update an element if exists, add it if doesn't exist
436 * @delete: delete an element
437 * @insert: insert new element into set
438 * @activate: activate new element in the next generation
439 * @deactivate: lookup for element and deactivate it in the next generation
440 * @flush: deactivate element in the next generation
441 * @remove: remove element from set
442 * @walk: iterate over all set elements
443 * @get: get set elements
444 * @ksize: kernel set size
445 * @usize: userspace set size
446 * @adjust_maxsize: delta to adjust maximum set size
447 * @commit: commit set elements
448 * @abort: abort set elements
449 * @privsize: function to return size of set private data
450 * @estimate: estimate the required memory size and the lookup complexity class
451 * @init: initialize private data of new set instance
452 * @destroy: destroy private data of set instance
453 * @gc_init: initialize garbage collection
454 * @abort_skip_removal: skip removal of elements from abort path
455 * @elemsize: element private size
456 *
457 * Operations lookup, update and delete have simpler interfaces, are faster
458 * and currently only used in the packet path. All the rest are slower,
459 * control plane functions.
460 */
461 struct nft_set_ops {
462 const struct nft_set_ext * (*lookup)(const struct net *net,
463 const struct nft_set *set,
464 const u32 *key);
465 const struct nft_set_ext * (*update)(struct nft_set *set,
466 const u32 *key,
467 const struct nft_expr *expr,
468 struct nft_regs *regs);
469 bool (*delete)(const struct nft_set *set,
470 const u32 *key);
471
472 int (*insert)(const struct net *net,
473 const struct nft_set *set,
474 const struct nft_set_elem *elem,
475 struct nft_elem_priv **priv);
476 void (*activate)(const struct net *net,
477 const struct nft_set *set,
478 struct nft_elem_priv *elem_priv);
479 struct nft_elem_priv * (*deactivate)(const struct net *net,
480 const struct nft_set *set,
481 const struct nft_set_elem *elem);
482 void (*flush)(const struct net *net,
483 const struct nft_set *set,
484 struct nft_elem_priv *priv);
485 void (*remove)(const struct net *net,
486 const struct nft_set *set,
487 struct nft_elem_priv *elem_priv);
488 void (*walk)(const struct nft_ctx *ctx,
489 struct nft_set *set,
490 struct nft_set_iter *iter);
491 struct nft_elem_priv * (*get)(const struct net *net,
492 const struct nft_set *set,
493 const struct nft_set_elem *elem,
494 unsigned int flags);
495 u32 (*ksize)(u32 size);
496 u32 (*usize)(u32 size);
497 u32 (*adjust_maxsize)(const struct nft_set *set);
498 void (*commit)(struct nft_set *set);
499 void (*abort)(const struct nft_set *set);
500 u64 (*privsize)(const struct nlattr * const nla[],
501 const struct nft_set_desc *desc);
502 bool (*estimate)(const struct nft_set_desc *desc,
503 u32 features,
504 struct nft_set_estimate *est);
505 int (*init)(const struct nft_set *set,
506 const struct nft_set_desc *desc,
507 const struct nlattr * const nla[]);
508 void (*destroy)(const struct nft_ctx *ctx,
509 const struct nft_set *set);
510 void (*gc_init)(const struct nft_set *set);
511
512 bool abort_skip_removal;
513 unsigned int elemsize;
514 };
515
516 /**
517 * struct nft_set_type - nf_tables set type
518 *
519 * @ops: set ops for this type
520 * @features: features supported by the implementation
521 */
522 struct nft_set_type {
523 const struct nft_set_ops ops;
524 u32 features;
525 };
526 #define to_set_type(o) container_of(o, struct nft_set_type, ops)
527
528 struct nft_set_elem_expr {
529 u8 size;
530 unsigned char data[]
531 __attribute__((aligned(__alignof__(struct nft_expr))));
532 };
533
534 #define nft_setelem_expr_at(__elem_expr, __offset) \
535 ((struct nft_expr *)&__elem_expr->data[__offset])
536
537 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \
538 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \
539 __size < (__elem_expr)->size; \
540 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size)
541
542 #define NFT_SET_EXPR_MAX 2
543
544 /**
545 * struct nft_set - nf_tables set instance
546 *
547 * @list: table set list node
548 * @bindings: list of set bindings
549 * @refs: internal refcounting for async set destruction
550 * @table: table this set belongs to
551 * @net: netnamespace this set belongs to
552 * @name: name of the set
553 * @handle: unique handle of the set
554 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
555 * @dtype: data type (verdict or numeric type defined by userspace)
556 * @objtype: object type (see NFT_OBJECT_* definitions)
557 * @size: maximum set size
558 * @field_len: length of each field in concatenation, bytes
559 * @field_count: number of concatenated fields in element
560 * @in_update_walk: true during ->walk() in transaction phase
561 * @use: number of rules references to this set
562 * @nelems: number of elements
563 * @ndeact: number of deactivated elements queued for removal
564 * @timeout: default timeout value in jiffies
565 * @gc_int: garbage collection interval in msecs
566 * @policy: set parameterization (see enum nft_set_policies)
567 * @udlen: user data length
568 * @udata: user data
569 * @pending_update: list of pending update set element
570 * @ops: set ops
571 * @flags: set flags
572 * @dead: set will be freed, never cleared
573 * @genmask: generation mask
574 * @klen: key length
575 * @dlen: data length
576 * @num_exprs: numbers of exprs
577 * @exprs: stateful expression
578 * @catchall_list: list of catch-all set element
579 * @data: private set data
580 */
581 struct nft_set {
582 struct list_head list;
583 struct list_head bindings;
584 refcount_t refs;
585 struct nft_table *table;
586 possible_net_t net;
587 char *name;
588 u64 handle;
589 u32 ktype;
590 u32 dtype;
591 u32 objtype;
592 u32 size;
593 u8 field_len[NFT_REG32_COUNT];
594 u8 field_count;
595 bool in_update_walk;
596 u32 use;
597 atomic_t nelems;
598 u32 ndeact;
599 u64 timeout;
600 u32 gc_int;
601 u16 policy;
602 u16 udlen;
603 unsigned char *udata;
604 struct list_head pending_update;
605 /* runtime data below here */
606 const struct nft_set_ops *ops ____cacheline_aligned;
607 u16 flags:13,
608 dead:1,
609 genmask:2;
610 u8 klen;
611 u8 dlen;
612 u8 num_exprs;
613 struct nft_expr *exprs[NFT_SET_EXPR_MAX];
614 struct list_head catchall_list;
615 unsigned char data[]
616 __attribute__((aligned(__alignof__(u64))));
617 };
618
nft_set_is_anonymous(const struct nft_set * set)619 static inline bool nft_set_is_anonymous(const struct nft_set *set)
620 {
621 return set->flags & NFT_SET_ANONYMOUS;
622 }
623
nft_set_priv(const struct nft_set * set)624 static inline void *nft_set_priv(const struct nft_set *set)
625 {
626 return (void *)set->data;
627 }
628
nft_set_datatype(const struct nft_set * set)629 static inline enum nft_data_types nft_set_datatype(const struct nft_set *set)
630 {
631 return set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
632 }
633
nft_set_gc_is_pending(const struct nft_set * s)634 static inline bool nft_set_gc_is_pending(const struct nft_set *s)
635 {
636 return refcount_read(&s->refs) != 1;
637 }
638
nft_set_container_of(const void * priv)639 static inline struct nft_set *nft_set_container_of(const void *priv)
640 {
641 return (void *)priv - offsetof(struct nft_set, data);
642 }
643
644 struct nft_set *nft_set_lookup_global(const struct net *net,
645 const struct nft_table *table,
646 const struct nlattr *nla_set_name,
647 const struct nlattr *nla_set_id,
648 u8 genmask);
649
650 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
651 const struct nft_set *set);
652
nft_set_gc_interval(const struct nft_set * set)653 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
654 {
655 u32 gc_int = READ_ONCE(set->gc_int);
656
657 return gc_int ? msecs_to_jiffies(gc_int) : HZ;
658 }
659
660 /**
661 * struct nft_set_binding - nf_tables set binding
662 *
663 * @list: set bindings list node
664 * @chain: chain containing the rule bound to the set
665 * @flags: set action flags
666 *
667 * A set binding contains all information necessary for validation
668 * of new elements added to a bound set.
669 */
670 struct nft_set_binding {
671 struct list_head list;
672 const struct nft_chain *chain;
673 u32 flags;
674 };
675
676 enum nft_trans_phase;
677 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set);
678 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
679 struct nft_set_binding *binding,
680 enum nft_trans_phase phase);
681 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
682 struct nft_set_binding *binding);
683 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
684
685 /**
686 * enum nft_set_extensions - set extension type IDs
687 *
688 * @NFT_SET_EXT_KEY: element key
689 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges
690 * @NFT_SET_EXT_DATA: mapping data
691 * @NFT_SET_EXT_FLAGS: element flags
692 * @NFT_SET_EXT_TIMEOUT: element timeout
693 * @NFT_SET_EXT_USERDATA: user data associated with the element
694 * @NFT_SET_EXT_EXPRESSIONS: expressions associated with the element
695 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element
696 * @NFT_SET_EXT_NUM: number of extension types
697 */
698 enum nft_set_extensions {
699 NFT_SET_EXT_KEY,
700 NFT_SET_EXT_KEY_END,
701 NFT_SET_EXT_DATA,
702 NFT_SET_EXT_FLAGS,
703 NFT_SET_EXT_TIMEOUT,
704 NFT_SET_EXT_USERDATA,
705 NFT_SET_EXT_EXPRESSIONS,
706 NFT_SET_EXT_OBJREF,
707 NFT_SET_EXT_NUM
708 };
709
710 /**
711 * struct nft_set_ext_type - set extension type
712 *
713 * @len: fixed part length of the extension
714 * @align: alignment requirements of the extension
715 */
716 struct nft_set_ext_type {
717 u8 len;
718 u8 align;
719 };
720
721 extern const struct nft_set_ext_type nft_set_ext_types[];
722
723 /**
724 * struct nft_set_ext_tmpl - set extension template
725 *
726 * @len: length of extension area
727 * @offset: offsets of individual extension types
728 * @ext_len: length of the expected extension(used to sanity check)
729 */
730 struct nft_set_ext_tmpl {
731 u16 len;
732 u8 offset[NFT_SET_EXT_NUM];
733 u8 ext_len[NFT_SET_EXT_NUM];
734 };
735
736 /**
737 * struct nft_set_ext - set extensions
738 *
739 * @genmask: generation mask, but also flags (see NFT_SET_ELEM_DEAD_BIT)
740 * @offset: offsets of individual extension types
741 * @data: beginning of extension data
742 *
743 * This structure must be aligned to word size, otherwise atomic bitops
744 * on genmask field can cause alignment failure on some archs.
745 */
746 struct nft_set_ext {
747 u8 genmask;
748 u8 offset[NFT_SET_EXT_NUM];
749 char data[];
750 } __aligned(BITS_PER_LONG / 8);
751
nft_set_ext_prepare(struct nft_set_ext_tmpl * tmpl)752 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
753 {
754 memset(tmpl, 0, sizeof(*tmpl));
755 tmpl->len = sizeof(struct nft_set_ext);
756 }
757
nft_set_ext_add_length(struct nft_set_ext_tmpl * tmpl,u8 id,unsigned int len)758 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
759 unsigned int len)
760 {
761 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
762 if (tmpl->len > U8_MAX)
763 return -EINVAL;
764
765 tmpl->offset[id] = tmpl->len;
766 tmpl->ext_len[id] = nft_set_ext_types[id].len + len;
767 tmpl->len += tmpl->ext_len[id];
768
769 return 0;
770 }
771
nft_set_ext_add(struct nft_set_ext_tmpl * tmpl,u8 id)772 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
773 {
774 return nft_set_ext_add_length(tmpl, id, 0);
775 }
776
nft_set_ext_init(struct nft_set_ext * ext,const struct nft_set_ext_tmpl * tmpl)777 static inline void nft_set_ext_init(struct nft_set_ext *ext,
778 const struct nft_set_ext_tmpl *tmpl)
779 {
780 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
781 }
782
__nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)783 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
784 {
785 return !!ext->offset[id];
786 }
787
nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)788 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
789 {
790 return ext && __nft_set_ext_exists(ext, id);
791 }
792
nft_set_ext(const struct nft_set_ext * ext,u8 id)793 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
794 {
795 return (void *)ext + ext->offset[id];
796 }
797
nft_set_ext_key(const struct nft_set_ext * ext)798 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
799 {
800 return nft_set_ext(ext, NFT_SET_EXT_KEY);
801 }
802
nft_set_ext_key_end(const struct nft_set_ext * ext)803 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
804 {
805 return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
806 }
807
nft_set_ext_data(const struct nft_set_ext * ext)808 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
809 {
810 return nft_set_ext(ext, NFT_SET_EXT_DATA);
811 }
812
nft_set_ext_flags(const struct nft_set_ext * ext)813 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
814 {
815 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
816 }
817
818 struct nft_timeout {
819 u64 timeout;
820 u64 expiration;
821 };
822
nft_set_ext_timeout(const struct nft_set_ext * ext)823 static inline struct nft_timeout *nft_set_ext_timeout(const struct nft_set_ext *ext)
824 {
825 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
826 }
827
nft_set_ext_userdata(const struct nft_set_ext * ext)828 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
829 {
830 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
831 }
832
nft_set_ext_expr(const struct nft_set_ext * ext)833 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
834 {
835 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS);
836 }
837
__nft_set_elem_expired(const struct nft_set_ext * ext,u64 tstamp)838 static inline bool __nft_set_elem_expired(const struct nft_set_ext *ext,
839 u64 tstamp)
840 {
841 if (!nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) ||
842 READ_ONCE(nft_set_ext_timeout(ext)->timeout) == 0)
843 return false;
844
845 return time_after_eq64(tstamp, READ_ONCE(nft_set_ext_timeout(ext)->expiration));
846 }
847
nft_set_elem_expired(const struct nft_set_ext * ext)848 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
849 {
850 return __nft_set_elem_expired(ext, get_jiffies_64());
851 }
852
nft_set_elem_ext(const struct nft_set * set,const struct nft_elem_priv * elem_priv)853 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
854 const struct nft_elem_priv *elem_priv)
855 {
856 return (void *)elem_priv + set->ops->elemsize;
857 }
858
nft_set_ext_obj(const struct nft_set_ext * ext)859 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
860 {
861 return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
862 }
863
864 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
865 const struct nft_set *set,
866 const struct nlattr *attr);
867
868 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
869 const struct nft_set_ext_tmpl *tmpl,
870 const u32 *key, const u32 *key_end,
871 const u32 *data,
872 u64 timeout, u64 expiration, gfp_t gfp);
873 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
874 struct nft_expr *expr_array[]);
875 void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
876 struct nft_set_elem_expr *elem_expr);
877 void nft_set_elem_destroy(const struct nft_set *set,
878 const struct nft_elem_priv *elem_priv,
879 bool destroy_expr);
880 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
881 const struct nft_set *set,
882 const struct nft_elem_priv *elem_priv);
883
884 struct nft_expr_ops;
885 /**
886 * struct nft_expr_type - nf_tables expression type
887 *
888 * @select_ops: function to select nft_expr_ops
889 * @release_ops: release nft_expr_ops
890 * @ops: default ops, used when no select_ops functions is present
891 * @inner_ops: inner ops, used for inner packet operation
892 * @list: used internally
893 * @name: Identifier
894 * @owner: module reference
895 * @policy: netlink attribute policy
896 * @maxattr: highest netlink attribute number
897 * @family: address family for AF-specific types
898 * @flags: expression type flags
899 */
900 struct nft_expr_type {
901 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
902 const struct nlattr * const tb[]);
903 void (*release_ops)(const struct nft_expr_ops *ops);
904 const struct nft_expr_ops *ops;
905 const struct nft_expr_ops *inner_ops;
906 struct list_head list;
907 const char *name;
908 struct module *owner;
909 const struct nla_policy *policy;
910 unsigned int maxattr;
911 u8 family;
912 u8 flags;
913 };
914
915 #define NFT_EXPR_STATEFUL 0x1
916 #define NFT_EXPR_GC 0x2
917
918 enum nft_trans_phase {
919 NFT_TRANS_PREPARE,
920 NFT_TRANS_PREPARE_ERROR,
921 NFT_TRANS_ABORT,
922 NFT_TRANS_COMMIT,
923 NFT_TRANS_RELEASE
924 };
925
926 struct nft_flow_rule;
927 struct nft_offload_ctx;
928
929 /**
930 * struct nft_expr_ops - nf_tables expression operations
931 *
932 * @eval: Expression evaluation function
933 * @clone: Expression clone function
934 * @size: full expression size, including private data size
935 * @init: initialization function
936 * @activate: activate expression in the next generation
937 * @deactivate: deactivate expression in next generation
938 * @destroy: destruction function, called after synchronize_rcu
939 * @destroy_clone: destruction clone function
940 * @dump: function to dump parameters
941 * @validate: validate expression, called during loop detection
942 * @gc: garbage collection expression
943 * @offload: hardware offload expression
944 * @offload_action: function to report true/false to allocate one slot or not in the flow
945 * offload array
946 * @offload_stats: function to synchronize hardware stats via updating the counter expression
947 * @type: expression type
948 * @data: extra data to attach to this expression operation
949 */
950 struct nft_expr_ops {
951 void (*eval)(const struct nft_expr *expr,
952 struct nft_regs *regs,
953 const struct nft_pktinfo *pkt);
954 int (*clone)(struct nft_expr *dst,
955 const struct nft_expr *src, gfp_t gfp);
956 unsigned int size;
957
958 int (*init)(const struct nft_ctx *ctx,
959 const struct nft_expr *expr,
960 const struct nlattr * const tb[]);
961 void (*activate)(const struct nft_ctx *ctx,
962 const struct nft_expr *expr);
963 void (*deactivate)(const struct nft_ctx *ctx,
964 const struct nft_expr *expr,
965 enum nft_trans_phase phase);
966 void (*destroy)(const struct nft_ctx *ctx,
967 const struct nft_expr *expr);
968 void (*destroy_clone)(const struct nft_ctx *ctx,
969 const struct nft_expr *expr);
970 int (*dump)(struct sk_buff *skb,
971 const struct nft_expr *expr,
972 bool reset);
973 int (*validate)(const struct nft_ctx *ctx,
974 const struct nft_expr *expr);
975 bool (*gc)(struct net *net,
976 const struct nft_expr *expr);
977 int (*offload)(struct nft_offload_ctx *ctx,
978 struct nft_flow_rule *flow,
979 const struct nft_expr *expr);
980 bool (*offload_action)(const struct nft_expr *expr);
981 void (*offload_stats)(struct nft_expr *expr,
982 const struct flow_stats *stats);
983 const struct nft_expr_type *type;
984 void *data;
985 };
986
987 /**
988 * struct nft_rule - nf_tables rule
989 *
990 * @list: used internally
991 * @handle: rule handle
992 * @genmask: generation mask
993 * @dlen: length of expression data
994 * @udata: user data is appended to the rule
995 * @data: expression data
996 */
997 struct nft_rule {
998 struct list_head list;
999 u64 handle:42,
1000 genmask:2,
1001 dlen:12,
1002 udata:1;
1003 unsigned char data[]
1004 __attribute__((aligned(__alignof__(struct nft_expr))));
1005 };
1006
nft_expr_first(const struct nft_rule * rule)1007 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
1008 {
1009 return (struct nft_expr *)&rule->data[0];
1010 }
1011
nft_expr_next(const struct nft_expr * expr)1012 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
1013 {
1014 return ((void *)expr) + expr->ops->size;
1015 }
1016
nft_expr_last(const struct nft_rule * rule)1017 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
1018 {
1019 return (struct nft_expr *)&rule->data[rule->dlen];
1020 }
1021
nft_expr_more(const struct nft_rule * rule,const struct nft_expr * expr)1022 static inline bool nft_expr_more(const struct nft_rule *rule,
1023 const struct nft_expr *expr)
1024 {
1025 return expr != nft_expr_last(rule) && expr->ops;
1026 }
1027
nft_userdata(const struct nft_rule * rule)1028 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
1029 {
1030 return (void *)&rule->data[rule->dlen];
1031 }
1032
1033 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule);
1034 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
1035 enum nft_trans_phase phase);
1036 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule);
1037
nft_set_elem_update_expr(const struct nft_set_ext * ext,struct nft_regs * regs,const struct nft_pktinfo * pkt)1038 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
1039 struct nft_regs *regs,
1040 const struct nft_pktinfo *pkt)
1041 {
1042 struct nft_set_elem_expr *elem_expr;
1043 struct nft_expr *expr;
1044 u32 size;
1045
1046 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) {
1047 elem_expr = nft_set_ext_expr(ext);
1048 nft_setelem_expr_foreach(expr, elem_expr, size) {
1049 expr->ops->eval(expr, regs, pkt);
1050 if (regs->verdict.code == NFT_BREAK)
1051 return;
1052 }
1053 }
1054 }
1055
1056 /*
1057 * The last pointer isn't really necessary, but the compiler isn't able to
1058 * determine that the result of nft_expr_last() is always the same since it
1059 * can't assume that the dlen value wasn't changed within calls in the loop.
1060 */
1061 #define nft_rule_for_each_expr(expr, last, rule) \
1062 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
1063 (expr) != (last); \
1064 (expr) = nft_expr_next(expr))
1065
1066 #define NFT_CHAIN_POLICY_UNSET U8_MAX
1067
1068 struct nft_rule_dp {
1069 u64 is_last:1,
1070 dlen:12,
1071 handle:42; /* for tracing */
1072 unsigned char data[]
1073 __attribute__((aligned(__alignof__(struct nft_expr))));
1074 };
1075
1076 struct nft_rule_dp_last {
1077 struct nft_rule_dp end; /* end of nft_rule_blob marker */
1078 struct rcu_head h; /* call_rcu head */
1079 struct nft_rule_blob *blob; /* ptr to free via call_rcu */
1080 const struct nft_chain *chain; /* for nftables tracing */
1081 };
1082
nft_rule_next(const struct nft_rule_dp * rule)1083 static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule)
1084 {
1085 return (void *)rule + sizeof(*rule) + rule->dlen;
1086 }
1087
1088 struct nft_rule_blob {
1089 unsigned long size;
1090 unsigned char data[]
1091 __attribute__((aligned(__alignof__(struct nft_rule_dp))));
1092 };
1093
1094 enum nft_chain_types {
1095 NFT_CHAIN_T_DEFAULT = 0,
1096 NFT_CHAIN_T_ROUTE,
1097 NFT_CHAIN_T_NAT,
1098 NFT_CHAIN_T_MAX
1099 };
1100
1101 /**
1102 * struct nft_chain_validate_state - validation state
1103 *
1104 * If a chain is encountered again during table validation it is
1105 * possible to avoid revalidation provided the calling context is
1106 * compatible. This structure stores relevant calling context of
1107 * previous validations.
1108 *
1109 * @hook_mask: the hook numbers and locations the chain is linked to
1110 * @depth: the deepest call chain level the chain is linked to
1111 */
1112 struct nft_chain_validate_state {
1113 u8 hook_mask[NFT_CHAIN_T_MAX];
1114 u8 depth;
1115 };
1116
1117 /**
1118 * struct nft_chain - nf_tables chain
1119 *
1120 * @blob_gen_0: rule blob pointer to the current generation
1121 * @blob_gen_1: rule blob pointer to the future generation
1122 * @rules: list of rules in the chain
1123 * @list: used internally
1124 * @rhlhead: used internally
1125 * @table: table that this chain belongs to
1126 * @handle: chain handle
1127 * @use: number of jump references to this chain
1128 * @flags: bitmask of enum NFTA_CHAIN_FLAGS
1129 * @bound: bind or not
1130 * @genmask: generation mask
1131 * @name: name of the chain
1132 * @udlen: user data length
1133 * @udata: user data in the chain
1134 * @blob_next: rule blob pointer to the next in the chain
1135 * @vstate: validation state
1136 */
1137 struct nft_chain {
1138 struct nft_rule_blob __rcu *blob_gen_0;
1139 struct nft_rule_blob __rcu *blob_gen_1;
1140 struct list_head rules;
1141 struct list_head list;
1142 struct rhlist_head rhlhead;
1143 struct nft_table *table;
1144 u64 handle;
1145 u32 use;
1146 u8 flags:5,
1147 bound:1,
1148 genmask:2;
1149 char *name;
1150 u16 udlen;
1151 u8 *udata;
1152
1153 /* Only used during control plane commit phase: */
1154 struct nft_rule_blob *blob_next;
1155 struct nft_chain_validate_state vstate;
1156 };
1157
1158 int nft_chain_validate(const struct nft_ctx *ctx, struct nft_chain *chain);
1159 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
1160 const struct nft_set_iter *iter,
1161 struct nft_elem_priv *elem_priv);
1162 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set);
1163 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1164 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1165
1166 /**
1167 * struct nft_chain_type - nf_tables chain type info
1168 *
1169 * @name: name of the type
1170 * @type: numeric identifier
1171 * @family: address family
1172 * @owner: module owner
1173 * @hook_mask: mask of valid hooks
1174 * @hooks: array of hook functions
1175 * @ops_register: base chain register function
1176 * @ops_unregister: base chain unregister function
1177 */
1178 struct nft_chain_type {
1179 const char *name;
1180 enum nft_chain_types type;
1181 int family;
1182 struct module *owner;
1183 unsigned int hook_mask;
1184 nf_hookfn *hooks[NFT_MAX_HOOKS];
1185 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
1186 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
1187 };
1188
1189 int nft_chain_validate_dependency(const struct nft_chain *chain,
1190 enum nft_chain_types type);
1191 int nft_chain_validate_hooks(const struct nft_chain *chain,
1192 unsigned int hook_flags);
1193
nft_chain_binding(const struct nft_chain * chain)1194 static inline bool nft_chain_binding(const struct nft_chain *chain)
1195 {
1196 return chain->flags & NFT_CHAIN_BINDING;
1197 }
1198
nft_chain_is_bound(struct nft_chain * chain)1199 static inline bool nft_chain_is_bound(struct nft_chain *chain)
1200 {
1201 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
1202 }
1203
1204 int nft_chain_add(struct nft_table *table, struct nft_chain *chain);
1205 void nft_chain_del(struct nft_chain *chain);
1206 void nf_tables_chain_destroy(struct nft_chain *chain);
1207
1208 struct nft_stats {
1209 u64 bytes;
1210 u64 pkts;
1211 struct u64_stats_sync syncp;
1212 };
1213
1214 #define NFT_HOOK_REMOVE (1 << 0)
1215
1216 struct nft_hook {
1217 struct list_head list;
1218 struct list_head ops_list;
1219 struct rcu_head rcu;
1220 char ifname[IFNAMSIZ];
1221 u8 ifnamelen;
1222 u8 flags;
1223 };
1224
1225 struct nf_hook_ops *nft_hook_find_ops(const struct nft_hook *hook,
1226 const struct net_device *dev);
1227 struct nf_hook_ops *nft_hook_find_ops_rcu(const struct nft_hook *hook,
1228 const struct net_device *dev);
1229
1230 /**
1231 * struct nft_base_chain - nf_tables base chain
1232 *
1233 * @ops: netfilter hook ops
1234 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
1235 * @type: chain type
1236 * @policy: default policy
1237 * @flags: indicate the base chain disabled or not
1238 * @stats: per-cpu chain stats
1239 * @chain: the chain
1240 * @flow_block: flow block (for hardware offload)
1241 */
1242 struct nft_base_chain {
1243 struct nf_hook_ops ops;
1244 struct list_head hook_list;
1245 const struct nft_chain_type *type;
1246 u8 policy;
1247 u8 flags;
1248 struct nft_stats __percpu *stats;
1249 struct nft_chain chain;
1250 struct flow_block flow_block;
1251 };
1252
nft_base_chain(const struct nft_chain * chain)1253 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
1254 {
1255 return container_of(chain, struct nft_base_chain, chain);
1256 }
1257
nft_is_base_chain(const struct nft_chain * chain)1258 static inline bool nft_is_base_chain(const struct nft_chain *chain)
1259 {
1260 return chain->flags & NFT_CHAIN_BASE;
1261 }
1262
1263 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
1264
nft_use_inc(u32 * use)1265 static inline bool nft_use_inc(u32 *use)
1266 {
1267 if (*use == UINT_MAX)
1268 return false;
1269
1270 (*use)++;
1271
1272 return true;
1273 }
1274
nft_use_dec(u32 * use)1275 static inline void nft_use_dec(u32 *use)
1276 {
1277 WARN_ON_ONCE((*use)-- == 0);
1278 }
1279
1280 /* For error and abort path: restore use counter to previous state. */
nft_use_inc_restore(u32 * use)1281 static inline void nft_use_inc_restore(u32 *use)
1282 {
1283 WARN_ON_ONCE(!nft_use_inc(use));
1284 }
1285
1286 #define nft_use_dec_restore nft_use_dec
1287
1288 /**
1289 * struct nft_table - nf_tables table
1290 *
1291 * @list: used internally
1292 * @chains_ht: chains in the table
1293 * @chains: same, for stable walks
1294 * @sets: sets in the table
1295 * @objects: stateful objects in the table
1296 * @flowtables: flow tables in the table
1297 * @hgenerator: handle generator state
1298 * @handle: table handle
1299 * @use: number of chain references to this table
1300 * @family:address family
1301 * @flags: table flag (see enum nft_table_flags)
1302 * @genmask: generation mask
1303 * @nlpid: netlink port ID
1304 * @name: name of the table
1305 * @udlen: length of the user data
1306 * @udata: user data
1307 * @validate_state: internal, set when transaction adds jumps
1308 */
1309 struct nft_table {
1310 struct list_head list;
1311 struct rhltable chains_ht;
1312 struct list_head chains;
1313 struct list_head sets;
1314 struct list_head objects;
1315 struct list_head flowtables;
1316 u64 hgenerator;
1317 u64 handle;
1318 u32 use;
1319 u16 family:6,
1320 flags:8,
1321 genmask:2;
1322 u32 nlpid;
1323 char *name;
1324 u16 udlen;
1325 u8 *udata;
1326 u8 validate_state;
1327 };
1328
nft_table_has_owner(const struct nft_table * table)1329 static inline bool nft_table_has_owner(const struct nft_table *table)
1330 {
1331 return table->flags & NFT_TABLE_F_OWNER;
1332 }
1333
nft_table_is_orphan(const struct nft_table * table)1334 static inline bool nft_table_is_orphan(const struct nft_table *table)
1335 {
1336 return (table->flags & (NFT_TABLE_F_OWNER | NFT_TABLE_F_PERSIST)) ==
1337 NFT_TABLE_F_PERSIST;
1338 }
1339
nft_base_chain_netdev(int family,u32 hooknum)1340 static inline bool nft_base_chain_netdev(int family, u32 hooknum)
1341 {
1342 return family == NFPROTO_NETDEV ||
1343 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
1344 }
1345
1346 void nft_register_chain_type(const struct nft_chain_type *);
1347 void nft_unregister_chain_type(const struct nft_chain_type *);
1348
1349 int nft_register_expr(struct nft_expr_type *);
1350 void nft_unregister_expr(struct nft_expr_type *);
1351
1352 int nft_verdict_dump(struct sk_buff *skb, int type,
1353 const struct nft_verdict *v);
1354
1355 /**
1356 * struct nft_object_hash_key - key to lookup nft_object
1357 *
1358 * @name: name of the stateful object to look up
1359 * @table: table the object belongs to
1360 */
1361 struct nft_object_hash_key {
1362 const char *name;
1363 const struct nft_table *table;
1364 };
1365
1366 /**
1367 * struct nft_object - nf_tables stateful object
1368 *
1369 * @list: table stateful object list node
1370 * @rhlhead: nft_objname_ht node
1371 * @key: keys that identify this object
1372 * @genmask: generation mask
1373 * @use: number of references to this stateful object
1374 * @handle: unique object handle
1375 * @udlen: length of user data
1376 * @udata: user data
1377 * @ops: object operations
1378 * @data: object data, layout depends on type
1379 */
1380 struct nft_object {
1381 struct list_head list;
1382 struct rhlist_head rhlhead;
1383 struct nft_object_hash_key key;
1384 u32 genmask:2;
1385 u32 use;
1386 u64 handle;
1387 u16 udlen;
1388 u8 *udata;
1389 /* runtime data below here */
1390 const struct nft_object_ops *ops ____cacheline_aligned;
1391 unsigned char data[]
1392 __attribute__((aligned(__alignof__(u64))));
1393 };
1394
nft_obj_data(const struct nft_object * obj)1395 static inline void *nft_obj_data(const struct nft_object *obj)
1396 {
1397 return (void *)obj->data;
1398 }
1399
1400 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
1401
1402 struct nft_object *nft_obj_lookup(const struct net *net,
1403 const struct nft_table *table,
1404 const struct nlattr *nla, u32 objtype,
1405 u8 genmask);
1406
1407 void nft_obj_notify(struct net *net, const struct nft_table *table,
1408 struct nft_object *obj, u32 portid, u32 seq,
1409 int event, u16 flags, int family, int report, gfp_t gfp);
1410
1411 /**
1412 * struct nft_object_type - stateful object type
1413 *
1414 * @select_ops: function to select nft_object_ops
1415 * @ops: default ops, used when no select_ops functions is present
1416 * @list: list node in list of object types
1417 * @type: stateful object numeric type
1418 * @owner: module owner
1419 * @maxattr: maximum netlink attribute
1420 * @family: address family for AF-specific object types
1421 * @policy: netlink attribute policy
1422 */
1423 struct nft_object_type {
1424 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
1425 const struct nlattr * const tb[]);
1426 const struct nft_object_ops *ops;
1427 struct list_head list;
1428 u32 type;
1429 unsigned int maxattr;
1430 u8 family;
1431 struct module *owner;
1432 const struct nla_policy *policy;
1433 };
1434
1435 /**
1436 * struct nft_object_ops - stateful object operations
1437 *
1438 * @eval: stateful object evaluation function
1439 * @size: stateful object size
1440 * @init: initialize object from netlink attributes
1441 * @destroy: release existing stateful object
1442 * @dump: netlink dump stateful object
1443 * @update: update stateful object
1444 * @type: pointer to object type
1445 */
1446 struct nft_object_ops {
1447 void (*eval)(struct nft_object *obj,
1448 struct nft_regs *regs,
1449 const struct nft_pktinfo *pkt);
1450 unsigned int size;
1451 int (*init)(const struct nft_ctx *ctx,
1452 const struct nlattr *const tb[],
1453 struct nft_object *obj);
1454 void (*destroy)(const struct nft_ctx *ctx,
1455 struct nft_object *obj);
1456 int (*dump)(struct sk_buff *skb,
1457 struct nft_object *obj,
1458 bool reset);
1459 void (*update)(struct nft_object *obj,
1460 struct nft_object *newobj);
1461 const struct nft_object_type *type;
1462 };
1463
1464 int nft_register_obj(struct nft_object_type *obj_type);
1465 void nft_unregister_obj(struct nft_object_type *obj_type);
1466
1467 #define NFT_NETDEVICE_MAX 256
1468
1469 /**
1470 * struct nft_flowtable - nf_tables flow table
1471 *
1472 * @list: flow table list node in table list
1473 * @table: the table the flow table is contained in
1474 * @name: name of this flow table
1475 * @hooknum: hook number
1476 * @ops_len: number of hooks in array
1477 * @genmask: generation mask
1478 * @use: number of references to this flow table
1479 * @handle: unique object handle
1480 * @hook_list: hook list for hooks per net_device in flowtables
1481 * @data: rhashtable and garbage collector
1482 */
1483 struct nft_flowtable {
1484 struct list_head list;
1485 struct nft_table *table;
1486 char *name;
1487 int hooknum;
1488 int ops_len;
1489 u32 genmask:2;
1490 u32 use;
1491 u64 handle;
1492 /* runtime data below here */
1493 struct list_head hook_list ____cacheline_aligned;
1494 struct nf_flowtable data;
1495 };
1496
1497 struct nft_flowtable *nft_flowtable_lookup(const struct net *net,
1498 const struct nft_table *table,
1499 const struct nlattr *nla,
1500 u8 genmask);
1501
1502 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
1503 struct nft_flowtable *flowtable,
1504 enum nft_trans_phase phase);
1505
1506 void nft_register_flowtable_type(struct nf_flowtable_type *type);
1507 void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
1508
1509 /**
1510 * struct nft_traceinfo - nft tracing information and state
1511 *
1512 * @trace: other struct members are initialised
1513 * @nf_trace: copy of skb->nf_trace before rule evaluation
1514 * @type: event type (enum nft_trace_types)
1515 * @skbid: hash of skb to be used as trace id
1516 * @packet_dumped: packet headers sent in a previous traceinfo message
1517 * @basechain: base chain currently processed
1518 */
1519 struct nft_traceinfo {
1520 bool trace;
1521 bool nf_trace;
1522 bool packet_dumped;
1523 enum nft_trace_types type:8;
1524 u32 skbid;
1525 const struct nft_base_chain *basechain;
1526 };
1527
1528 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
1529 const struct nft_chain *basechain);
1530
1531 void nft_trace_notify(const struct nft_pktinfo *pkt,
1532 const struct nft_verdict *verdict,
1533 const struct nft_rule_dp *rule,
1534 struct nft_traceinfo *info);
1535
1536 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1537 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1538
1539 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1540 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1541
1542 #define MODULE_ALIAS_NFT_EXPR(name) \
1543 MODULE_ALIAS("nft-expr-" name)
1544
1545 #define MODULE_ALIAS_NFT_OBJ(type) \
1546 MODULE_ALIAS("nft-obj-" __stringify(type))
1547
1548 #if IS_ENABLED(CONFIG_NF_TABLES)
1549
1550 /*
1551 * The gencursor defines two generations, the currently active and the
1552 * next one. Objects contain a bitmask of 2 bits specifying the generations
1553 * they're active in. A set bit means they're inactive in the generation
1554 * represented by that bit.
1555 *
1556 * New objects start out as inactive in the current and active in the
1557 * next generation. When committing the ruleset the bitmask is cleared,
1558 * meaning they're active in all generations. When removing an object,
1559 * it is set inactive in the next generation. After committing the ruleset,
1560 * the objects are removed.
1561 */
nft_gencursor_next(const struct net * net)1562 static inline unsigned int nft_gencursor_next(const struct net *net)
1563 {
1564 return net->nft.gencursor + 1 == 1 ? 1 : 0;
1565 }
1566
nft_genmask_next(const struct net * net)1567 static inline u8 nft_genmask_next(const struct net *net)
1568 {
1569 return 1 << nft_gencursor_next(net);
1570 }
1571
nft_genmask_cur(const struct net * net)1572 static inline u8 nft_genmask_cur(const struct net *net)
1573 {
1574 /* Use READ_ONCE() to prevent refetching the value for atomicity */
1575 return 1 << READ_ONCE(net->nft.gencursor);
1576 }
1577
1578 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
1579
1580 /*
1581 * Generic transaction helpers
1582 */
1583
1584 /* Check if this object is currently active. */
1585 #define nft_is_active(__net, __obj) \
1586 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1587
1588 /* Check if this object is active in the next generation. */
1589 #define nft_is_active_next(__net, __obj) \
1590 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1591
1592 /* This object becomes active in the next generation. */
1593 #define nft_activate_next(__net, __obj) \
1594 (__obj)->genmask = nft_genmask_cur(__net)
1595
1596 /* This object becomes inactive in the next generation. */
1597 #define nft_deactivate_next(__net, __obj) \
1598 (__obj)->genmask = nft_genmask_next(__net)
1599
1600 /* After committing the ruleset, clear the stale generation bit. */
1601 #define nft_clear(__net, __obj) \
1602 (__obj)->genmask &= ~nft_genmask_next(__net)
1603 #define nft_active_genmask(__obj, __genmask) \
1604 !((__obj)->genmask & __genmask)
1605
1606 /*
1607 * Set element transaction helpers
1608 */
1609
nft_set_elem_active(const struct nft_set_ext * ext,u8 genmask)1610 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1611 u8 genmask)
1612 {
1613 return !(ext->genmask & genmask);
1614 }
1615
nft_set_elem_change_active(const struct net * net,const struct nft_set * set,struct nft_set_ext * ext)1616 static inline void nft_set_elem_change_active(const struct net *net,
1617 const struct nft_set *set,
1618 struct nft_set_ext *ext)
1619 {
1620 ext->genmask ^= nft_genmask_next(net);
1621 }
1622
1623 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */
1624
1625 #define NFT_SET_ELEM_DEAD_MASK (1 << 2)
1626
1627 #if defined(__LITTLE_ENDIAN_BITFIELD)
1628 #define NFT_SET_ELEM_DEAD_BIT 2
1629 #elif defined(__BIG_ENDIAN_BITFIELD)
1630 #define NFT_SET_ELEM_DEAD_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1631 #else
1632 #error
1633 #endif
1634
nft_set_elem_dead(struct nft_set_ext * ext)1635 static inline void nft_set_elem_dead(struct nft_set_ext *ext)
1636 {
1637 unsigned long *word = (unsigned long *)ext;
1638
1639 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1640 set_bit(NFT_SET_ELEM_DEAD_BIT, word);
1641 }
1642
nft_set_elem_is_dead(const struct nft_set_ext * ext)1643 static inline int nft_set_elem_is_dead(const struct nft_set_ext *ext)
1644 {
1645 unsigned long *word = (unsigned long *)ext;
1646
1647 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1648 return test_bit(NFT_SET_ELEM_DEAD_BIT, word);
1649 }
1650
1651 /**
1652 * struct nft_trans - nf_tables object update in transaction
1653 *
1654 * @list: used internally
1655 * @net: struct net
1656 * @table: struct nft_table the object resides in
1657 * @msg_type: message type
1658 * @seq: netlink sequence number
1659 * @flags: modifiers to new request
1660 * @report: notify via unicast netlink message
1661 * @put_net: net needs to be put
1662 *
1663 * This is the information common to all objects in the transaction,
1664 * this must always be the first member of derived sub-types.
1665 */
1666 struct nft_trans {
1667 struct list_head list;
1668 struct net *net;
1669 struct nft_table *table;
1670 int msg_type;
1671 u32 seq;
1672 u16 flags;
1673 u8 report:1;
1674 u8 put_net:1;
1675 };
1676
1677 /**
1678 * struct nft_trans_hook - nf_tables hook update in transaction
1679 * @list: used internally
1680 * @hook: struct nft_hook with the device hook
1681 */
1682 struct nft_trans_hook {
1683 struct list_head list;
1684 struct nft_hook *hook;
1685 };
1686
1687 /**
1688 * struct nft_trans_binding - nf_tables object with binding support in transaction
1689 * @nft_trans: base structure, MUST be first member
1690 * @binding_list: list of objects with possible bindings
1691 *
1692 * This is the base type used by objects that can be bound to a chain.
1693 */
1694 struct nft_trans_binding {
1695 struct nft_trans nft_trans;
1696 struct list_head binding_list;
1697 };
1698
1699 struct nft_trans_rule {
1700 struct nft_trans nft_trans;
1701 struct nft_rule *rule;
1702 struct nft_chain *chain;
1703 struct nft_flow_rule *flow;
1704 u32 rule_id;
1705 bool bound;
1706 };
1707
1708 #define nft_trans_container_rule(trans) \
1709 container_of(trans, struct nft_trans_rule, nft_trans)
1710 #define nft_trans_rule(trans) \
1711 nft_trans_container_rule(trans)->rule
1712 #define nft_trans_flow_rule(trans) \
1713 nft_trans_container_rule(trans)->flow
1714 #define nft_trans_rule_id(trans) \
1715 nft_trans_container_rule(trans)->rule_id
1716 #define nft_trans_rule_bound(trans) \
1717 nft_trans_container_rule(trans)->bound
1718 #define nft_trans_rule_chain(trans) \
1719 nft_trans_container_rule(trans)->chain
1720
1721 struct nft_trans_set {
1722 struct nft_trans_binding nft_trans_binding;
1723 struct list_head list_trans_newset;
1724 struct nft_set *set;
1725 u32 set_id;
1726 u32 gc_int;
1727 u64 timeout;
1728 bool update;
1729 bool bound;
1730 u32 size;
1731 };
1732
1733 #define nft_trans_container_set(t) \
1734 container_of(t, struct nft_trans_set, nft_trans_binding.nft_trans)
1735 #define nft_trans_set(trans) \
1736 nft_trans_container_set(trans)->set
1737 #define nft_trans_set_id(trans) \
1738 nft_trans_container_set(trans)->set_id
1739 #define nft_trans_set_bound(trans) \
1740 nft_trans_container_set(trans)->bound
1741 #define nft_trans_set_update(trans) \
1742 nft_trans_container_set(trans)->update
1743 #define nft_trans_set_timeout(trans) \
1744 nft_trans_container_set(trans)->timeout
1745 #define nft_trans_set_gc_int(trans) \
1746 nft_trans_container_set(trans)->gc_int
1747 #define nft_trans_set_size(trans) \
1748 nft_trans_container_set(trans)->size
1749
1750 struct nft_trans_chain {
1751 struct nft_trans_binding nft_trans_binding;
1752 struct nft_chain *chain;
1753 char *name;
1754 struct nft_stats __percpu *stats;
1755 u8 policy;
1756 bool update;
1757 bool bound;
1758 u32 chain_id;
1759 struct nft_base_chain *basechain;
1760 struct list_head hook_list;
1761 };
1762
1763 #define nft_trans_container_chain(t) \
1764 container_of(t, struct nft_trans_chain, nft_trans_binding.nft_trans)
1765 #define nft_trans_chain(trans) \
1766 nft_trans_container_chain(trans)->chain
1767 #define nft_trans_chain_update(trans) \
1768 nft_trans_container_chain(trans)->update
1769 #define nft_trans_chain_name(trans) \
1770 nft_trans_container_chain(trans)->name
1771 #define nft_trans_chain_stats(trans) \
1772 nft_trans_container_chain(trans)->stats
1773 #define nft_trans_chain_policy(trans) \
1774 nft_trans_container_chain(trans)->policy
1775 #define nft_trans_chain_bound(trans) \
1776 nft_trans_container_chain(trans)->bound
1777 #define nft_trans_chain_id(trans) \
1778 nft_trans_container_chain(trans)->chain_id
1779 #define nft_trans_basechain(trans) \
1780 nft_trans_container_chain(trans)->basechain
1781 #define nft_trans_chain_hooks(trans) \
1782 nft_trans_container_chain(trans)->hook_list
1783
1784 struct nft_trans_table {
1785 struct nft_trans nft_trans;
1786 bool update;
1787 };
1788
1789 #define nft_trans_container_table(trans) \
1790 container_of(trans, struct nft_trans_table, nft_trans)
1791 #define nft_trans_table_update(trans) \
1792 nft_trans_container_table(trans)->update
1793
1794 enum nft_trans_elem_flags {
1795 NFT_TRANS_UPD_TIMEOUT = (1 << 0),
1796 NFT_TRANS_UPD_EXPIRATION = (1 << 1),
1797 };
1798
1799 struct nft_elem_update {
1800 u64 timeout;
1801 u64 expiration;
1802 u8 flags;
1803 };
1804
1805 struct nft_trans_one_elem {
1806 struct nft_elem_priv *priv;
1807 struct nft_elem_update *update;
1808 };
1809
1810 struct nft_trans_elem {
1811 struct nft_trans nft_trans;
1812 struct nft_set *set;
1813 bool bound;
1814 unsigned int nelems;
1815 struct nft_trans_one_elem elems[] __counted_by(nelems);
1816 };
1817
1818 #define nft_trans_container_elem(t) \
1819 container_of(t, struct nft_trans_elem, nft_trans)
1820 #define nft_trans_elem_set(trans) \
1821 nft_trans_container_elem(trans)->set
1822 #define nft_trans_elem_set_bound(trans) \
1823 nft_trans_container_elem(trans)->bound
1824
1825 struct nft_trans_obj {
1826 struct nft_trans nft_trans;
1827 struct nft_object *obj;
1828 struct nft_object *newobj;
1829 bool update;
1830 };
1831
1832 #define nft_trans_container_obj(t) \
1833 container_of(t, struct nft_trans_obj, nft_trans)
1834 #define nft_trans_obj(trans) \
1835 nft_trans_container_obj(trans)->obj
1836 #define nft_trans_obj_newobj(trans) \
1837 nft_trans_container_obj(trans)->newobj
1838 #define nft_trans_obj_update(trans) \
1839 nft_trans_container_obj(trans)->update
1840
1841 struct nft_trans_flowtable {
1842 struct nft_trans nft_trans;
1843 struct nft_flowtable *flowtable;
1844 struct list_head hook_list;
1845 u32 flags;
1846 bool update;
1847 };
1848
1849 #define nft_trans_container_flowtable(t) \
1850 container_of(t, struct nft_trans_flowtable, nft_trans)
1851 #define nft_trans_flowtable(trans) \
1852 nft_trans_container_flowtable(trans)->flowtable
1853 #define nft_trans_flowtable_update(trans) \
1854 nft_trans_container_flowtable(trans)->update
1855 #define nft_trans_flowtable_hooks(trans) \
1856 nft_trans_container_flowtable(trans)->hook_list
1857 #define nft_trans_flowtable_flags(trans) \
1858 nft_trans_container_flowtable(trans)->flags
1859
1860 #define NFT_TRANS_GC_BATCHCOUNT 256
1861
1862 struct nft_trans_gc {
1863 struct list_head list;
1864 struct net *net;
1865 struct nft_set *set;
1866 u32 seq;
1867 u16 count;
1868 struct nft_elem_priv *priv[NFT_TRANS_GC_BATCHCOUNT];
1869 struct rcu_head rcu;
1870 };
1871
nft_trans_gc_space(const struct nft_trans_gc * trans)1872 static inline int nft_trans_gc_space(const struct nft_trans_gc *trans)
1873 {
1874 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
1875 }
1876
nft_ctx_update(struct nft_ctx * ctx,const struct nft_trans * trans)1877 static inline void nft_ctx_update(struct nft_ctx *ctx,
1878 const struct nft_trans *trans)
1879 {
1880 switch (trans->msg_type) {
1881 case NFT_MSG_NEWRULE:
1882 case NFT_MSG_DELRULE:
1883 case NFT_MSG_DESTROYRULE:
1884 ctx->chain = nft_trans_rule_chain(trans);
1885 break;
1886 case NFT_MSG_NEWCHAIN:
1887 case NFT_MSG_DELCHAIN:
1888 case NFT_MSG_DESTROYCHAIN:
1889 ctx->chain = nft_trans_chain(trans);
1890 break;
1891 default:
1892 ctx->chain = NULL;
1893 break;
1894 }
1895
1896 ctx->net = trans->net;
1897 ctx->table = trans->table;
1898 ctx->family = trans->table->family;
1899 ctx->report = trans->report;
1900 ctx->flags = trans->flags;
1901 ctx->seq = trans->seq;
1902 }
1903
1904 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
1905 unsigned int gc_seq, gfp_t gfp);
1906 void nft_trans_gc_destroy(struct nft_trans_gc *trans);
1907
1908 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
1909 unsigned int gc_seq, gfp_t gfp);
1910 void nft_trans_gc_queue_async_done(struct nft_trans_gc *gc);
1911
1912 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp);
1913 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans);
1914
1915 void nft_trans_gc_elem_add(struct nft_trans_gc *gc, void *priv);
1916
1917 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
1918 unsigned int gc_seq);
1919 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc);
1920
1921 void nft_setelem_data_deactivate(const struct net *net,
1922 const struct nft_set *set,
1923 struct nft_elem_priv *elem_priv);
1924
1925 int __init nft_chain_filter_init(void);
1926 void nft_chain_filter_fini(void);
1927
1928 void __init nft_chain_route_init(void);
1929 void nft_chain_route_fini(void);
1930
1931 void nf_tables_trans_destroy_flush_work(struct net *net);
1932
1933 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
1934 __be64 nf_jiffies64_to_msecs(u64 input);
1935
1936 #ifdef CONFIG_MODULES
1937 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
1938 #else
nft_request_module(struct net * net,const char * fmt,...)1939 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
1940 #endif
1941
1942 struct nftables_pernet {
1943 struct list_head tables;
1944 struct list_head commit_list;
1945 struct list_head destroy_list;
1946 struct list_head commit_set_list;
1947 struct list_head binding_list;
1948 struct list_head module_list;
1949 struct list_head notify_list;
1950 struct mutex commit_mutex;
1951 u64 table_handle;
1952 u64 tstamp;
1953 unsigned int gc_seq;
1954 u8 validate_state;
1955 struct work_struct destroy_work;
1956 };
1957
1958 extern unsigned int nf_tables_net_id;
1959
nft_pernet(const struct net * net)1960 static inline struct nftables_pernet *nft_pernet(const struct net *net)
1961 {
1962 return net_generic(net, nf_tables_net_id);
1963 }
1964
nft_net_tstamp(const struct net * net)1965 static inline u64 nft_net_tstamp(const struct net *net)
1966 {
1967 return nft_pernet(net)->tstamp;
1968 }
1969
1970 #endif /* _NET_NF_TABLES_H */
1971