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
17 const struct net_device *in;
18 const struct net_device *out;
19 const struct nf_hook_ops *ops;
23 /* for x_tables compatibility */
24 struct xt_action_param xt;
27 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
28 const struct nf_hook_ops *ops,
30 const struct nf_hook_state *state)
33 pkt->in = pkt->xt.in = state->in;
34 pkt->out = pkt->xt.out = state->out;
36 pkt->xt.hooknum = ops->hooknum;
37 pkt->xt.family = ops->pf;
41 * struct nft_verdict - nf_tables verdict
43 * @code: nf_tables/netfilter verdict code
44 * @chain: destination chain for NFT_JUMP/NFT_GOTO
48 struct nft_chain *chain;
54 struct nft_verdict verdict;
56 } __attribute__((aligned(__alignof__(u64))));
59 * struct nft_regs - nf_tables register set
61 * @data: data registers
62 * @verdict: verdict register
64 * The first four data registers alias to the verdict register.
69 struct nft_verdict verdict;
73 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
76 memcpy(dst, src, len);
79 static inline void nft_data_debug(const struct nft_data *data)
81 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
82 data->data[0], data->data[1],
83 data->data[2], data->data[3]);
87 * struct nft_ctx - nf_tables rule/set context
90 * @afi: address family info
91 * @table: the table the chain is contained in
92 * @chain: the chain the rule is contained in
93 * @nla: netlink attributes
94 * @portid: netlink portID of the original message
95 * @seq: netlink sequence number
96 * @report: notify via unicast netlink message
100 struct nft_af_info *afi;
101 struct nft_table *table;
102 struct nft_chain *chain;
103 const struct nlattr * const *nla;
109 struct nft_data_desc {
110 enum nft_data_types type;
114 int nft_data_init(const struct nft_ctx *ctx,
115 struct nft_data *data, unsigned int size,
116 struct nft_data_desc *desc, const struct nlattr *nla);
117 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type);
118 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
119 enum nft_data_types type, unsigned int len);
121 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
123 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
126 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
128 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1;
131 unsigned int nft_parse_register(const struct nlattr *attr);
132 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
134 int nft_validate_register_load(enum nft_registers reg, unsigned int len);
135 int nft_validate_register_store(const struct nft_ctx *ctx,
136 enum nft_registers reg,
137 const struct nft_data *data,
138 enum nft_data_types type, unsigned int len);
141 * struct nft_userdata - user defined data associated with an object
143 * @len: length of the data
146 * The presence of user data is indicated in an object specific fashion,
147 * so a length of zero can't occur and the value "len" indicates data
150 struct nft_userdata {
152 unsigned char data[0];
156 * struct nft_set_elem - generic representation of set elements
159 * @priv: element private data and extensions
161 struct nft_set_elem {
163 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
170 struct nft_set_iter {
174 int (*fn)(const struct nft_ctx *ctx,
175 const struct nft_set *set,
176 const struct nft_set_iter *iter,
177 const struct nft_set_elem *elem);
181 * struct nft_set_desc - description of set elements
185 * @size: number of set elements
187 struct nft_set_desc {
194 * enum nft_set_class - performance class
196 * @NFT_LOOKUP_O_1: constant, O(1)
197 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
198 * @NFT_LOOKUP_O_N: linear, O(N)
202 NFT_SET_CLASS_O_LOG_N,
207 * struct nft_set_estimate - estimation of memory and performance
210 * @size: required memory
211 * @class: lookup performance class
213 struct nft_set_estimate {
215 enum nft_set_class class;
222 * struct nft_set_ops - nf_tables set operations
224 * @lookup: look up an element within the set
225 * @insert: insert new element into set
226 * @activate: activate new element in the next generation
227 * @deactivate: deactivate element in the next generation
228 * @remove: remove element from set
229 * @walk: iterate over all set elemeennts
230 * @privsize: function to return size of set private data
231 * @init: initialize private data of new set instance
232 * @destroy: destroy private data of set instance
233 * @list: nf_tables_set_ops list node
234 * @owner: module reference
235 * @elemsize: element private size
236 * @features: features supported by the implementation
239 bool (*lookup)(const struct nft_set *set,
241 const struct nft_set_ext **ext);
242 bool (*update)(struct nft_set *set,
244 void *(*new)(struct nft_set *,
245 const struct nft_expr *,
247 const struct nft_expr *expr,
248 struct nft_regs *regs,
249 const struct nft_set_ext **ext);
251 int (*insert)(const struct nft_set *set,
252 const struct nft_set_elem *elem);
253 void (*activate)(const struct nft_set *set,
254 const struct nft_set_elem *elem);
255 void * (*deactivate)(const struct nft_set *set,
256 const struct nft_set_elem *elem);
257 void (*remove)(const struct nft_set *set,
258 const struct nft_set_elem *elem);
259 void (*walk)(const struct nft_ctx *ctx,
260 const struct nft_set *set,
261 struct nft_set_iter *iter);
263 unsigned int (*privsize)(const struct nlattr * const nla[]);
264 bool (*estimate)(const struct nft_set_desc *desc,
266 struct nft_set_estimate *est);
267 int (*init)(const struct nft_set *set,
268 const struct nft_set_desc *desc,
269 const struct nlattr * const nla[]);
270 void (*destroy)(const struct nft_set *set);
272 struct list_head list;
273 struct module *owner;
274 unsigned int elemsize;
278 int nft_register_set(struct nft_set_ops *ops);
279 void nft_unregister_set(struct nft_set_ops *ops);
282 * struct nft_set - nf_tables set instance
284 * @list: table set list node
285 * @bindings: list of set bindings
286 * @name: name of the set
287 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
288 * @dtype: data type (verdict or numeric type defined by userspace)
289 * @size: maximum set size
290 * @nelems: number of elements
291 * @ndeact: number of deactivated elements queued for removal
292 * @timeout: default timeout value in msecs
293 * @gc_int: garbage collection interval in msecs
294 * @policy: set parameterization (see enum nft_set_policies)
296 * @pnet: network namespace
300 * @data: private set data
303 struct list_head list;
304 struct list_head bindings;
314 /* runtime data below here */
315 const struct nft_set_ops *ops ____cacheline_aligned;
321 __attribute__((aligned(__alignof__(u64))));
324 static inline void *nft_set_priv(const struct nft_set *set)
326 return (void *)set->data;
329 static inline struct nft_set *nft_set_container_of(const void *priv)
331 return (void *)priv - offsetof(struct nft_set, data);
334 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
335 const struct nlattr *nla);
336 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
337 const struct nlattr *nla);
339 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
341 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
345 * struct nft_set_binding - nf_tables set binding
347 * @list: set bindings list node
348 * @chain: chain containing the rule bound to the set
349 * @flags: set action flags
351 * A set binding contains all information necessary for validation
352 * of new elements added to a bound set.
354 struct nft_set_binding {
355 struct list_head list;
356 const struct nft_chain *chain;
360 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
361 struct nft_set_binding *binding);
362 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
363 struct nft_set_binding *binding);
366 * enum nft_set_extensions - set extension type IDs
368 * @NFT_SET_EXT_KEY: element key
369 * @NFT_SET_EXT_DATA: mapping data
370 * @NFT_SET_EXT_FLAGS: element flags
371 * @NFT_SET_EXT_TIMEOUT: element timeout
372 * @NFT_SET_EXT_EXPIRATION: element expiration time
373 * @NFT_SET_EXT_USERDATA: user data associated with the element
374 * @NFT_SET_EXT_EXPR: expression assiociated with the element
375 * @NFT_SET_EXT_NUM: number of extension types
377 enum nft_set_extensions {
382 NFT_SET_EXT_EXPIRATION,
383 NFT_SET_EXT_USERDATA,
389 * struct nft_set_ext_type - set extension type
391 * @len: fixed part length of the extension
392 * @align: alignment requirements of the extension
394 struct nft_set_ext_type {
399 extern const struct nft_set_ext_type nft_set_ext_types[];
402 * struct nft_set_ext_tmpl - set extension template
404 * @len: length of extension area
405 * @offset: offsets of individual extension types
407 struct nft_set_ext_tmpl {
409 u8 offset[NFT_SET_EXT_NUM];
413 * struct nft_set_ext - set extensions
415 * @genmask: generation mask
416 * @offset: offsets of individual extension types
417 * @data: beginning of extension data
421 u8 offset[NFT_SET_EXT_NUM];
425 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
427 memset(tmpl, 0, sizeof(*tmpl));
428 tmpl->len = sizeof(struct nft_set_ext);
431 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
434 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
435 BUG_ON(tmpl->len > U8_MAX);
436 tmpl->offset[id] = tmpl->len;
437 tmpl->len += nft_set_ext_types[id].len + len;
440 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
442 nft_set_ext_add_length(tmpl, id, 0);
445 static inline void nft_set_ext_init(struct nft_set_ext *ext,
446 const struct nft_set_ext_tmpl *tmpl)
448 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
451 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
453 return !!ext->offset[id];
456 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
458 return ext && __nft_set_ext_exists(ext, id);
461 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
463 return (void *)ext + ext->offset[id];
466 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
468 return nft_set_ext(ext, NFT_SET_EXT_KEY);
471 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
473 return nft_set_ext(ext, NFT_SET_EXT_DATA);
476 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
478 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
481 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
483 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
486 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext)
488 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
491 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
493 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
496 static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
498 return nft_set_ext(ext, NFT_SET_EXT_EXPR);
501 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
503 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
504 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext));
507 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
510 return elem + set->ops->elemsize;
513 void *nft_set_elem_init(const struct nft_set *set,
514 const struct nft_set_ext_tmpl *tmpl,
515 const u32 *key, const u32 *data,
516 u64 timeout, gfp_t gfp);
517 void nft_set_elem_destroy(const struct nft_set *set, void *elem);
520 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
523 * @set: set the elements belong to
524 * @cnt: count of elements
526 struct nft_set_gc_batch_head {
528 const struct nft_set *set;
532 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
533 sizeof(struct nft_set_gc_batch_head)) / \
537 * struct nft_set_gc_batch - nf_tables set garbage collection batch
539 * @head: GC batch head
540 * @elems: garbage collection elements
542 struct nft_set_gc_batch {
543 struct nft_set_gc_batch_head head;
544 void *elems[NFT_SET_GC_BATCH_SIZE];
547 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
549 void nft_set_gc_batch_release(struct rcu_head *rcu);
551 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
554 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
557 static inline struct nft_set_gc_batch *
558 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
562 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
564 nft_set_gc_batch_complete(gcb);
566 return nft_set_gc_batch_alloc(set, gfp);
569 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
572 gcb->elems[gcb->head.cnt++] = elem;
576 * struct nft_expr_type - nf_tables expression type
578 * @select_ops: function to select nft_expr_ops
579 * @ops: default ops, used when no select_ops functions is present
580 * @list: used internally
582 * @owner: module reference
583 * @policy: netlink attribute policy
584 * @maxattr: highest netlink attribute number
585 * @family: address family for AF-specific types
586 * @flags: expression type flags
588 struct nft_expr_type {
589 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
590 const struct nlattr * const tb[]);
591 const struct nft_expr_ops *ops;
592 struct list_head list;
594 struct module *owner;
595 const struct nla_policy *policy;
596 unsigned int maxattr;
601 #define NFT_EXPR_STATEFUL 0x1
604 * struct nft_expr_ops - nf_tables expression operations
606 * @eval: Expression evaluation function
607 * @size: full expression size, including private data size
608 * @init: initialization function
609 * @destroy: destruction function
610 * @dump: function to dump parameters
611 * @type: expression type
612 * @validate: validate expression, called during loop detection
613 * @data: extra data to attach to this expression operation
616 struct nft_expr_ops {
617 void (*eval)(const struct nft_expr *expr,
618 struct nft_regs *regs,
619 const struct nft_pktinfo *pkt);
622 int (*init)(const struct nft_ctx *ctx,
623 const struct nft_expr *expr,
624 const struct nlattr * const tb[]);
625 void (*destroy)(const struct nft_ctx *ctx,
626 const struct nft_expr *expr);
627 int (*dump)(struct sk_buff *skb,
628 const struct nft_expr *expr);
629 int (*validate)(const struct nft_ctx *ctx,
630 const struct nft_expr *expr,
631 const struct nft_data **data);
632 const struct nft_expr_type *type;
636 #define NFT_EXPR_MAXATTR 16
637 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
638 ALIGN(size, __alignof__(struct nft_expr)))
641 * struct nft_expr - nf_tables expression
643 * @ops: expression ops
644 * @data: expression private data
647 const struct nft_expr_ops *ops;
648 unsigned char data[];
651 static inline void *nft_expr_priv(const struct nft_expr *expr)
653 return (void *)expr->data;
656 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
657 const struct nlattr *nla);
658 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
659 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
660 const struct nft_expr *expr);
662 static inline void nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
664 __module_get(src->ops->type->owner);
665 memcpy(dst, src, src->ops->size);
669 * struct nft_rule - nf_tables rule
671 * @list: used internally
672 * @handle: rule handle
673 * @genmask: generation mask
674 * @dlen: length of expression data
675 * @udata: user data is appended to the rule
676 * @data: expression data
679 struct list_head list;
685 __attribute__((aligned(__alignof__(struct nft_expr))));
688 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
690 return (struct nft_expr *)&rule->data[0];
693 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
695 return ((void *)expr) + expr->ops->size;
698 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
700 return (struct nft_expr *)&rule->data[rule->dlen];
703 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
705 return (void *)&rule->data[rule->dlen];
709 * The last pointer isn't really necessary, but the compiler isn't able to
710 * determine that the result of nft_expr_last() is always the same since it
711 * can't assume that the dlen value wasn't changed within calls in the loop.
713 #define nft_rule_for_each_expr(expr, last, rule) \
714 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
716 (expr) = nft_expr_next(expr))
718 enum nft_chain_flags {
719 NFT_BASE_CHAIN = 0x1,
720 NFT_CHAIN_INACTIVE = 0x2,
724 * struct nft_chain - nf_tables chain
726 * @rules: list of rules in the chain
727 * @list: used internally
728 * @table: table that this chain belongs to
729 * @handle: chain handle
730 * @use: number of jump references to this chain
731 * @level: length of longest path to this chain
732 * @flags: bitmask of enum nft_chain_flags
733 * @name: name of the chain
736 struct list_head rules;
737 struct list_head list;
738 struct nft_table *table;
743 char name[NFT_CHAIN_MAXNAMELEN];
746 enum nft_chain_type {
747 NFT_CHAIN_T_DEFAULT = 0,
754 * struct nf_chain_type - nf_tables chain type info
756 * @name: name of the type
757 * @type: numeric identifier
758 * @family: address family
759 * @owner: module owner
760 * @hook_mask: mask of valid hooks
761 * @hooks: hookfn overrides
763 struct nf_chain_type {
765 enum nft_chain_type type;
767 struct module *owner;
768 unsigned int hook_mask;
769 nf_hookfn *hooks[NF_MAX_HOOKS];
772 int nft_chain_validate_dependency(const struct nft_chain *chain,
773 enum nft_chain_type type);
774 int nft_chain_validate_hooks(const struct nft_chain *chain,
775 unsigned int hook_flags);
780 struct u64_stats_sync syncp;
783 #define NFT_HOOK_OPS_MAX 2
786 * struct nft_base_chain - nf_tables base chain
788 * @ops: netfilter hook ops
789 * @pnet: net namespace that this chain belongs to
791 * @policy: default policy
792 * @stats: per-cpu chain stats
794 * @dev_name: device name that this base chain is attached to (if any)
796 struct nft_base_chain {
797 struct nf_hook_ops ops[NFT_HOOK_OPS_MAX];
799 const struct nf_chain_type *type;
801 struct nft_stats __percpu *stats;
802 struct nft_chain chain;
803 char dev_name[IFNAMSIZ];
806 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
808 return container_of(chain, struct nft_base_chain, chain);
811 unsigned int nft_do_chain(struct nft_pktinfo *pkt,
812 const struct nf_hook_ops *ops);
815 * struct nft_table - nf_tables table
817 * @list: used internally
818 * @chains: chains in the table
819 * @sets: sets in the table
820 * @hgenerator: handle generator state
821 * @use: number of chain references to this table
822 * @flags: table flag (see enum nft_table_flags)
823 * @name: name of the table
826 struct list_head list;
827 struct list_head chains;
828 struct list_head sets;
832 char name[NFT_TABLE_MAXNAMELEN];
836 NFT_AF_NEEDS_DEV = (1 << 0),
840 * struct nft_af_info - nf_tables address family info
842 * @list: used internally
843 * @family: address family
844 * @nhooks: number of hooks in this family
845 * @owner: module owner
846 * @tables: used internally
847 * @flags: family flags
848 * @nops: number of hook ops in this family
849 * @hook_ops_init: initialization function for chain hook ops
850 * @hooks: hookfn overrides for packet validation
853 struct list_head list;
856 struct module *owner;
857 struct list_head tables;
860 void (*hook_ops_init)(struct nf_hook_ops *,
862 nf_hookfn *hooks[NF_MAX_HOOKS];
865 int nft_register_afinfo(struct net *, struct nft_af_info *);
866 void nft_unregister_afinfo(struct nft_af_info *);
868 int nft_register_chain_type(const struct nf_chain_type *);
869 void nft_unregister_chain_type(const struct nf_chain_type *);
871 int nft_register_expr(struct nft_expr_type *);
872 void nft_unregister_expr(struct nft_expr_type *);
874 #define nft_dereference(p) \
875 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
877 #define MODULE_ALIAS_NFT_FAMILY(family) \
878 MODULE_ALIAS("nft-afinfo-" __stringify(family))
880 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
881 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
883 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
884 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
886 #define MODULE_ALIAS_NFT_EXPR(name) \
887 MODULE_ALIAS("nft-expr-" name)
889 #define MODULE_ALIAS_NFT_SET() \
890 MODULE_ALIAS("nft-set")
893 * The gencursor defines two generations, the currently active and the
894 * next one. Objects contain a bitmask of 2 bits specifying the generations
895 * they're active in. A set bit means they're inactive in the generation
896 * represented by that bit.
898 * New objects start out as inactive in the current and active in the
899 * next generation. When committing the ruleset the bitmask is cleared,
900 * meaning they're active in all generations. When removing an object,
901 * it is set inactive in the next generation. After committing the ruleset,
902 * the objects are removed.
904 static inline unsigned int nft_gencursor_next(const struct net *net)
906 return net->nft.gencursor + 1 == 1 ? 1 : 0;
909 static inline u8 nft_genmask_next(const struct net *net)
911 return 1 << nft_gencursor_next(net);
914 static inline u8 nft_genmask_cur(const struct net *net)
916 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
917 return 1 << ACCESS_ONCE(net->nft.gencursor);
920 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
923 * Set element transaction helpers
926 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
929 return !(ext->genmask & genmask);
932 static inline void nft_set_elem_change_active(const struct nft_set *set,
933 struct nft_set_ext *ext)
935 ext->genmask ^= nft_genmask_next(read_pnet(&set->pnet));
939 * We use a free bit in the genmask field to indicate the element
940 * is busy, meaning it is currently being processed either by
941 * the netlink API or GC.
943 * Even though the genmask is only a single byte wide, this works
944 * because the extension structure if fully constant once initialized,
945 * so there are no non-atomic write accesses unless it is already
948 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
950 #if defined(__LITTLE_ENDIAN_BITFIELD)
951 #define NFT_SET_ELEM_BUSY_BIT 2
952 #elif defined(__BIG_ENDIAN_BITFIELD)
953 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
958 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
960 unsigned long *word = (unsigned long *)ext;
962 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
963 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
966 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
968 unsigned long *word = (unsigned long *)ext;
970 clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
974 * struct nft_trans - nf_tables object update in transaction
976 * @list: used internally
977 * @msg_type: message type
978 * @ctx: transaction context
979 * @data: internal information related to the transaction
982 struct list_head list;
988 struct nft_trans_rule {
989 struct nft_rule *rule;
992 #define nft_trans_rule(trans) \
993 (((struct nft_trans_rule *)trans->data)->rule)
995 struct nft_trans_set {
1000 #define nft_trans_set(trans) \
1001 (((struct nft_trans_set *)trans->data)->set)
1002 #define nft_trans_set_id(trans) \
1003 (((struct nft_trans_set *)trans->data)->set_id)
1005 struct nft_trans_chain {
1007 char name[NFT_CHAIN_MAXNAMELEN];
1008 struct nft_stats __percpu *stats;
1012 #define nft_trans_chain_update(trans) \
1013 (((struct nft_trans_chain *)trans->data)->update)
1014 #define nft_trans_chain_name(trans) \
1015 (((struct nft_trans_chain *)trans->data)->name)
1016 #define nft_trans_chain_stats(trans) \
1017 (((struct nft_trans_chain *)trans->data)->stats)
1018 #define nft_trans_chain_policy(trans) \
1019 (((struct nft_trans_chain *)trans->data)->policy)
1021 struct nft_trans_table {
1026 #define nft_trans_table_update(trans) \
1027 (((struct nft_trans_table *)trans->data)->update)
1028 #define nft_trans_table_enable(trans) \
1029 (((struct nft_trans_table *)trans->data)->enable)
1031 struct nft_trans_elem {
1032 struct nft_set *set;
1033 struct nft_set_elem elem;
1036 #define nft_trans_elem_set(trans) \
1037 (((struct nft_trans_elem *)trans->data)->set)
1038 #define nft_trans_elem(trans) \
1039 (((struct nft_trans_elem *)trans->data)->elem)
1041 #endif /* _NET_NF_TABLES_H */