1 #ifndef _NET_NF_TABLES_H
2 #define _NET_NF_TABLES_H
4 #include <linux/module.h>
5 #include <linux/list.h>
6 #include <linux/netfilter.h>
7 #include <linux/netfilter/nfnetlink.h>
8 #include <linux/netfilter/x_tables.h>
9 #include <linux/netfilter/nf_tables.h>
10 #include <linux/u64_stats_sync.h>
11 #include <net/netlink.h>
13 #define NFT_JUMP_STACK_SIZE 16
18 const struct net_device *in;
19 const struct net_device *out;
25 /* for x_tables compatibility */
26 struct xt_action_param xt;
29 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
31 const struct nf_hook_state *state)
34 pkt->net = pkt->xt.net = state->net;
35 pkt->in = pkt->xt.in = state->in;
36 pkt->out = pkt->xt.out = state->out;
37 pkt->hook = pkt->xt.hooknum = state->hook;
38 pkt->pf = pkt->xt.family = state->pf;
42 * struct nft_verdict - nf_tables verdict
44 * @code: nf_tables/netfilter verdict code
45 * @chain: destination chain for NFT_JUMP/NFT_GOTO
49 struct nft_chain *chain;
55 struct nft_verdict verdict;
57 } __attribute__((aligned(__alignof__(u64))));
60 * struct nft_regs - nf_tables register set
62 * @data: data registers
63 * @verdict: verdict register
65 * The first four data registers alias to the verdict register.
70 struct nft_verdict verdict;
74 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
77 if (len % NFT_REG32_SIZE)
78 dst[len / NFT_REG32_SIZE] = 0;
79 memcpy(dst, src, len);
82 static inline void nft_data_debug(const struct nft_data *data)
84 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
85 data->data[0], data->data[1],
86 data->data[2], data->data[3]);
90 * struct nft_ctx - nf_tables rule/set context
93 * @afi: address family info
94 * @table: the table the chain is contained in
95 * @chain: the chain the rule is contained in
96 * @nla: netlink attributes
97 * @portid: netlink portID of the original message
98 * @seq: netlink sequence number
99 * @report: notify via unicast netlink message
103 struct nft_af_info *afi;
104 struct nft_table *table;
105 struct nft_chain *chain;
106 const struct nlattr * const *nla;
112 struct nft_data_desc {
113 enum nft_data_types type;
117 int nft_data_init(const struct nft_ctx *ctx,
118 struct nft_data *data, unsigned int size,
119 struct nft_data_desc *desc, const struct nlattr *nla);
120 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type);
121 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
122 enum nft_data_types type, unsigned int len);
124 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
126 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
129 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
131 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
134 unsigned int nft_parse_register(const struct nlattr *attr);
135 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
137 int nft_validate_register_load(enum nft_registers reg, unsigned int len);
138 int nft_validate_register_store(const struct nft_ctx *ctx,
139 enum nft_registers reg,
140 const struct nft_data *data,
141 enum nft_data_types type, unsigned int len);
144 * struct nft_userdata - user defined data associated with an object
146 * @len: length of the data
149 * The presence of user data is indicated in an object specific fashion,
150 * so a length of zero can't occur and the value "len" indicates data
153 struct nft_userdata {
155 unsigned char data[0];
159 * struct nft_set_elem - generic representation of set elements
162 * @priv: element private data and extensions
164 struct nft_set_elem {
166 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
173 struct nft_set_iter {
177 int (*fn)(const struct nft_ctx *ctx,
178 const struct nft_set *set,
179 const struct nft_set_iter *iter,
180 const struct nft_set_elem *elem);
184 * struct nft_set_desc - description of set elements
188 * @size: number of set elements
190 struct nft_set_desc {
197 * enum nft_set_class - performance class
199 * @NFT_LOOKUP_O_1: constant, O(1)
200 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
201 * @NFT_LOOKUP_O_N: linear, O(N)
205 NFT_SET_CLASS_O_LOG_N,
210 * struct nft_set_estimate - estimation of memory and performance
213 * @size: required memory
214 * @class: lookup performance class
216 struct nft_set_estimate {
218 enum nft_set_class class;
225 * struct nft_set_ops - nf_tables set operations
227 * @lookup: look up an element within the set
228 * @insert: insert new element into set
229 * @activate: activate new element in the next generation
230 * @deactivate: deactivate element in the next generation
231 * @remove: remove element from set
232 * @walk: iterate over all set elemeennts
233 * @privsize: function to return size of set private data
234 * @init: initialize private data of new set instance
235 * @destroy: destroy private data of set instance
236 * @list: nf_tables_set_ops list node
237 * @owner: module reference
238 * @elemsize: element private size
239 * @features: features supported by the implementation
242 bool (*lookup)(const struct nft_set *set,
244 const struct nft_set_ext **ext);
245 bool (*update)(struct nft_set *set,
247 void *(*new)(struct nft_set *,
248 const struct nft_expr *,
250 const struct nft_expr *expr,
251 struct nft_regs *regs,
252 const struct nft_set_ext **ext);
254 int (*insert)(const struct nft_set *set,
255 const struct nft_set_elem *elem);
256 void (*activate)(const struct nft_set *set,
257 const struct nft_set_elem *elem);
258 void * (*deactivate)(const struct nft_set *set,
259 const struct nft_set_elem *elem);
260 void (*remove)(const struct nft_set *set,
261 const struct nft_set_elem *elem);
262 void (*walk)(const struct nft_ctx *ctx,
263 const struct nft_set *set,
264 struct nft_set_iter *iter);
266 unsigned int (*privsize)(const struct nlattr * const nla[]);
267 bool (*estimate)(const struct nft_set_desc *desc,
269 struct nft_set_estimate *est);
270 int (*init)(const struct nft_set *set,
271 const struct nft_set_desc *desc,
272 const struct nlattr * const nla[]);
273 void (*destroy)(const struct nft_set *set);
275 struct list_head list;
276 struct module *owner;
277 unsigned int elemsize;
281 int nft_register_set(struct nft_set_ops *ops);
282 void nft_unregister_set(struct nft_set_ops *ops);
285 * struct nft_set - nf_tables set instance
287 * @list: table set list node
288 * @bindings: list of set bindings
289 * @name: name of the set
290 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
291 * @dtype: data type (verdict or numeric type defined by userspace)
292 * @size: maximum set size
293 * @nelems: number of elements
294 * @ndeact: number of deactivated elements queued for removal
295 * @timeout: default timeout value in msecs
296 * @gc_int: garbage collection interval in msecs
297 * @policy: set parameterization (see enum nft_set_policies)
299 * @pnet: network namespace
303 * @data: private set data
306 struct list_head list;
307 struct list_head bindings;
317 /* runtime data below here */
318 const struct nft_set_ops *ops ____cacheline_aligned;
324 __attribute__((aligned(__alignof__(u64))));
327 static inline void *nft_set_priv(const struct nft_set *set)
329 return (void *)set->data;
332 static inline struct nft_set *nft_set_container_of(const void *priv)
334 return (void *)priv - offsetof(struct nft_set, data);
337 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
338 const struct nlattr *nla);
339 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
340 const struct nlattr *nla);
342 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
344 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
348 * struct nft_set_binding - nf_tables set binding
350 * @list: set bindings list node
351 * @chain: chain containing the rule bound to the set
352 * @flags: set action flags
354 * A set binding contains all information necessary for validation
355 * of new elements added to a bound set.
357 struct nft_set_binding {
358 struct list_head list;
359 const struct nft_chain *chain;
363 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
364 struct nft_set_binding *binding);
365 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
366 struct nft_set_binding *binding);
369 * enum nft_set_extensions - set extension type IDs
371 * @NFT_SET_EXT_KEY: element key
372 * @NFT_SET_EXT_DATA: mapping data
373 * @NFT_SET_EXT_FLAGS: element flags
374 * @NFT_SET_EXT_TIMEOUT: element timeout
375 * @NFT_SET_EXT_EXPIRATION: element expiration time
376 * @NFT_SET_EXT_USERDATA: user data associated with the element
377 * @NFT_SET_EXT_EXPR: expression assiociated with the element
378 * @NFT_SET_EXT_NUM: number of extension types
380 enum nft_set_extensions {
385 NFT_SET_EXT_EXPIRATION,
386 NFT_SET_EXT_USERDATA,
392 * struct nft_set_ext_type - set extension type
394 * @len: fixed part length of the extension
395 * @align: alignment requirements of the extension
397 struct nft_set_ext_type {
402 extern const struct nft_set_ext_type nft_set_ext_types[];
405 * struct nft_set_ext_tmpl - set extension template
407 * @len: length of extension area
408 * @offset: offsets of individual extension types
410 struct nft_set_ext_tmpl {
412 u8 offset[NFT_SET_EXT_NUM];
416 * struct nft_set_ext - set extensions
418 * @genmask: generation mask
419 * @offset: offsets of individual extension types
420 * @data: beginning of extension data
424 u8 offset[NFT_SET_EXT_NUM];
428 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
430 memset(tmpl, 0, sizeof(*tmpl));
431 tmpl->len = sizeof(struct nft_set_ext);
434 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
437 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
438 BUG_ON(tmpl->len > U8_MAX);
439 tmpl->offset[id] = tmpl->len;
440 tmpl->len += nft_set_ext_types[id].len + len;
443 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
445 nft_set_ext_add_length(tmpl, id, 0);
448 static inline void nft_set_ext_init(struct nft_set_ext *ext,
449 const struct nft_set_ext_tmpl *tmpl)
451 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
454 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
456 return !!ext->offset[id];
459 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
461 return ext && __nft_set_ext_exists(ext, id);
464 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
466 return (void *)ext + ext->offset[id];
469 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
471 return nft_set_ext(ext, NFT_SET_EXT_KEY);
474 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
476 return nft_set_ext(ext, NFT_SET_EXT_DATA);
479 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
481 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
484 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
486 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
489 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext)
491 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
494 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
496 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
499 static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
501 return nft_set_ext(ext, NFT_SET_EXT_EXPR);
504 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
506 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
507 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext));
510 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
513 return elem + set->ops->elemsize;
516 void *nft_set_elem_init(const struct nft_set *set,
517 const struct nft_set_ext_tmpl *tmpl,
518 const u32 *key, const u32 *data,
519 u64 timeout, gfp_t gfp);
520 void nft_set_elem_destroy(const struct nft_set *set, void *elem);
523 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
526 * @set: set the elements belong to
527 * @cnt: count of elements
529 struct nft_set_gc_batch_head {
531 const struct nft_set *set;
535 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
536 sizeof(struct nft_set_gc_batch_head)) / \
540 * struct nft_set_gc_batch - nf_tables set garbage collection batch
542 * @head: GC batch head
543 * @elems: garbage collection elements
545 struct nft_set_gc_batch {
546 struct nft_set_gc_batch_head head;
547 void *elems[NFT_SET_GC_BATCH_SIZE];
550 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
552 void nft_set_gc_batch_release(struct rcu_head *rcu);
554 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
557 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
560 static inline struct nft_set_gc_batch *
561 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
565 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
567 nft_set_gc_batch_complete(gcb);
569 return nft_set_gc_batch_alloc(set, gfp);
572 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
575 gcb->elems[gcb->head.cnt++] = elem;
579 * struct nft_expr_type - nf_tables expression type
581 * @select_ops: function to select nft_expr_ops
582 * @ops: default ops, used when no select_ops functions is present
583 * @list: used internally
585 * @owner: module reference
586 * @policy: netlink attribute policy
587 * @maxattr: highest netlink attribute number
588 * @family: address family for AF-specific types
589 * @flags: expression type flags
591 struct nft_expr_type {
592 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
593 const struct nlattr * const tb[]);
594 const struct nft_expr_ops *ops;
595 struct list_head list;
597 struct module *owner;
598 const struct nla_policy *policy;
599 unsigned int maxattr;
604 #define NFT_EXPR_STATEFUL 0x1
607 * struct nft_expr_ops - nf_tables expression operations
609 * @eval: Expression evaluation function
610 * @size: full expression size, including private data size
611 * @init: initialization function
612 * @destroy: destruction function
613 * @dump: function to dump parameters
614 * @type: expression type
615 * @validate: validate expression, called during loop detection
616 * @data: extra data to attach to this expression operation
619 struct nft_expr_ops {
620 void (*eval)(const struct nft_expr *expr,
621 struct nft_regs *regs,
622 const struct nft_pktinfo *pkt);
623 int (*clone)(struct nft_expr *dst,
624 const struct nft_expr *src);
627 int (*init)(const struct nft_ctx *ctx,
628 const struct nft_expr *expr,
629 const struct nlattr * const tb[]);
630 void (*destroy)(const struct nft_ctx *ctx,
631 const struct nft_expr *expr);
632 int (*dump)(struct sk_buff *skb,
633 const struct nft_expr *expr);
634 int (*validate)(const struct nft_ctx *ctx,
635 const struct nft_expr *expr,
636 const struct nft_data **data);
637 const struct nft_expr_type *type;
641 #define NFT_EXPR_MAXATTR 16
642 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
643 ALIGN(size, __alignof__(struct nft_expr)))
646 * struct nft_expr - nf_tables expression
648 * @ops: expression ops
649 * @data: expression private data
652 const struct nft_expr_ops *ops;
654 __attribute__((aligned(__alignof__(u64))));
657 static inline void *nft_expr_priv(const struct nft_expr *expr)
659 return (void *)expr->data;
662 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
663 const struct nlattr *nla);
664 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
665 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
666 const struct nft_expr *expr);
668 static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
672 __module_get(src->ops->type->owner);
673 if (src->ops->clone) {
675 err = src->ops->clone(dst, src);
679 memcpy(dst, src, src->ops->size);
685 * struct nft_rule - nf_tables rule
687 * @list: used internally
688 * @handle: rule handle
689 * @genmask: generation mask
690 * @dlen: length of expression data
691 * @udata: user data is appended to the rule
692 * @data: expression data
695 struct list_head list;
701 __attribute__((aligned(__alignof__(struct nft_expr))));
704 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
706 return (struct nft_expr *)&rule->data[0];
709 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
711 return ((void *)expr) + expr->ops->size;
714 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
716 return (struct nft_expr *)&rule->data[rule->dlen];
719 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
721 return (void *)&rule->data[rule->dlen];
725 * The last pointer isn't really necessary, but the compiler isn't able to
726 * determine that the result of nft_expr_last() is always the same since it
727 * can't assume that the dlen value wasn't changed within calls in the loop.
729 #define nft_rule_for_each_expr(expr, last, rule) \
730 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
732 (expr) = nft_expr_next(expr))
734 enum nft_chain_flags {
735 NFT_BASE_CHAIN = 0x1,
736 NFT_CHAIN_INACTIVE = 0x2,
740 * struct nft_chain - nf_tables chain
742 * @rules: list of rules in the chain
743 * @list: used internally
744 * @table: table that this chain belongs to
745 * @handle: chain handle
746 * @use: number of jump references to this chain
747 * @level: length of longest path to this chain
748 * @flags: bitmask of enum nft_chain_flags
749 * @name: name of the chain
752 struct list_head rules;
753 struct list_head list;
754 struct nft_table *table;
759 char name[NFT_CHAIN_MAXNAMELEN];
762 enum nft_chain_type {
763 NFT_CHAIN_T_DEFAULT = 0,
770 * struct nf_chain_type - nf_tables chain type info
772 * @name: name of the type
773 * @type: numeric identifier
774 * @family: address family
775 * @owner: module owner
776 * @hook_mask: mask of valid hooks
777 * @hooks: hookfn overrides
779 struct nf_chain_type {
781 enum nft_chain_type type;
783 struct module *owner;
784 unsigned int hook_mask;
785 nf_hookfn *hooks[NF_MAX_HOOKS];
788 int nft_chain_validate_dependency(const struct nft_chain *chain,
789 enum nft_chain_type type);
790 int nft_chain_validate_hooks(const struct nft_chain *chain,
791 unsigned int hook_flags);
796 struct u64_stats_sync syncp;
799 #define NFT_HOOK_OPS_MAX 2
800 #define NFT_BASECHAIN_DISABLED (1 << 0)
803 * struct nft_base_chain - nf_tables base chain
805 * @ops: netfilter hook ops
806 * @pnet: net namespace that this chain belongs to
808 * @policy: default policy
809 * @stats: per-cpu chain stats
811 * @dev_name: device name that this base chain is attached to (if any)
813 struct nft_base_chain {
814 struct nf_hook_ops ops[NFT_HOOK_OPS_MAX];
816 const struct nf_chain_type *type;
819 struct nft_stats __percpu *stats;
820 struct nft_chain chain;
821 char dev_name[IFNAMSIZ];
824 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
826 return container_of(chain, struct nft_base_chain, chain);
829 int nft_register_basechain(struct nft_base_chain *basechain,
830 unsigned int hook_nops);
831 void nft_unregister_basechain(struct nft_base_chain *basechain,
832 unsigned int hook_nops);
834 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
837 * struct nft_table - nf_tables table
839 * @list: used internally
840 * @chains: chains in the table
841 * @sets: sets in the table
842 * @hgenerator: handle generator state
843 * @use: number of chain references to this table
844 * @flags: table flag (see enum nft_table_flags)
845 * @name: name of the table
848 struct list_head list;
849 struct list_head chains;
850 struct list_head sets;
854 char name[NFT_TABLE_MAXNAMELEN];
858 NFT_AF_NEEDS_DEV = (1 << 0),
862 * struct nft_af_info - nf_tables address family info
864 * @list: used internally
865 * @family: address family
866 * @nhooks: number of hooks in this family
867 * @owner: module owner
868 * @tables: used internally
869 * @flags: family flags
870 * @nops: number of hook ops in this family
871 * @hook_ops_init: initialization function for chain hook ops
872 * @hooks: hookfn overrides for packet validation
875 struct list_head list;
878 struct module *owner;
879 struct list_head tables;
882 void (*hook_ops_init)(struct nf_hook_ops *,
884 nf_hookfn *hooks[NF_MAX_HOOKS];
887 int nft_register_afinfo(struct net *, struct nft_af_info *);
888 void nft_unregister_afinfo(struct nft_af_info *);
890 int nft_register_chain_type(const struct nf_chain_type *);
891 void nft_unregister_chain_type(const struct nf_chain_type *);
893 int nft_register_expr(struct nft_expr_type *);
894 void nft_unregister_expr(struct nft_expr_type *);
896 #define nft_dereference(p) \
897 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
899 #define MODULE_ALIAS_NFT_FAMILY(family) \
900 MODULE_ALIAS("nft-afinfo-" __stringify(family))
902 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
903 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
905 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
906 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
908 #define MODULE_ALIAS_NFT_EXPR(name) \
909 MODULE_ALIAS("nft-expr-" name)
911 #define MODULE_ALIAS_NFT_SET() \
912 MODULE_ALIAS("nft-set")
915 * The gencursor defines two generations, the currently active and the
916 * next one. Objects contain a bitmask of 2 bits specifying the generations
917 * they're active in. A set bit means they're inactive in the generation
918 * represented by that bit.
920 * New objects start out as inactive in the current and active in the
921 * next generation. When committing the ruleset the bitmask is cleared,
922 * meaning they're active in all generations. When removing an object,
923 * it is set inactive in the next generation. After committing the ruleset,
924 * the objects are removed.
926 static inline unsigned int nft_gencursor_next(const struct net *net)
928 return net->nft.gencursor + 1 == 1 ? 1 : 0;
931 static inline u8 nft_genmask_next(const struct net *net)
933 return 1 << nft_gencursor_next(net);
936 static inline u8 nft_genmask_cur(const struct net *net)
938 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
939 return 1 << ACCESS_ONCE(net->nft.gencursor);
942 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
945 * Set element transaction helpers
948 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
951 return !(ext->genmask & genmask);
954 static inline void nft_set_elem_change_active(const struct nft_set *set,
955 struct nft_set_ext *ext)
957 ext->genmask ^= nft_genmask_next(read_pnet(&set->pnet));
961 * We use a free bit in the genmask field to indicate the element
962 * is busy, meaning it is currently being processed either by
963 * the netlink API or GC.
965 * Even though the genmask is only a single byte wide, this works
966 * because the extension structure if fully constant once initialized,
967 * so there are no non-atomic write accesses unless it is already
970 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
972 #if defined(__LITTLE_ENDIAN_BITFIELD)
973 #define NFT_SET_ELEM_BUSY_BIT 2
974 #elif defined(__BIG_ENDIAN_BITFIELD)
975 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
980 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
982 unsigned long *word = (unsigned long *)ext;
984 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
985 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
988 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
990 unsigned long *word = (unsigned long *)ext;
992 clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
996 * struct nft_trans - nf_tables object update in transaction
998 * @list: used internally
999 * @msg_type: message type
1000 * @ctx: transaction context
1001 * @data: internal information related to the transaction
1004 struct list_head list;
1010 struct nft_trans_rule {
1011 struct nft_rule *rule;
1014 #define nft_trans_rule(trans) \
1015 (((struct nft_trans_rule *)trans->data)->rule)
1017 struct nft_trans_set {
1018 struct nft_set *set;
1022 #define nft_trans_set(trans) \
1023 (((struct nft_trans_set *)trans->data)->set)
1024 #define nft_trans_set_id(trans) \
1025 (((struct nft_trans_set *)trans->data)->set_id)
1027 struct nft_trans_chain {
1029 char name[NFT_CHAIN_MAXNAMELEN];
1030 struct nft_stats __percpu *stats;
1034 #define nft_trans_chain_update(trans) \
1035 (((struct nft_trans_chain *)trans->data)->update)
1036 #define nft_trans_chain_name(trans) \
1037 (((struct nft_trans_chain *)trans->data)->name)
1038 #define nft_trans_chain_stats(trans) \
1039 (((struct nft_trans_chain *)trans->data)->stats)
1040 #define nft_trans_chain_policy(trans) \
1041 (((struct nft_trans_chain *)trans->data)->policy)
1043 struct nft_trans_table {
1048 #define nft_trans_table_update(trans) \
1049 (((struct nft_trans_table *)trans->data)->update)
1050 #define nft_trans_table_enable(trans) \
1051 (((struct nft_trans_table *)trans->data)->enable)
1053 struct nft_trans_elem {
1054 struct nft_set *set;
1055 struct nft_set_elem elem;
1058 #define nft_trans_elem_set(trans) \
1059 (((struct nft_trans_elem *)trans->data)->set)
1060 #define nft_trans_elem(trans) \
1061 (((struct nft_trans_elem *)trans->data)->elem)
1063 #endif /* _NET_NF_TABLES_H */