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 memcpy(dst, src, len);
80 static inline void nft_data_debug(const struct nft_data *data)
82 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
83 data->data[0], data->data[1],
84 data->data[2], data->data[3]);
88 * struct nft_ctx - nf_tables rule/set context
91 * @afi: address family info
92 * @table: the table the chain is contained in
93 * @chain: the chain the rule is contained in
94 * @nla: netlink attributes
95 * @portid: netlink portID of the original message
96 * @seq: netlink sequence number
97 * @report: notify via unicast netlink message
101 struct nft_af_info *afi;
102 struct nft_table *table;
103 struct nft_chain *chain;
104 const struct nlattr * const *nla;
110 struct nft_data_desc {
111 enum nft_data_types type;
115 int nft_data_init(const struct nft_ctx *ctx,
116 struct nft_data *data, unsigned int size,
117 struct nft_data_desc *desc, const struct nlattr *nla);
118 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type);
119 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
120 enum nft_data_types type, unsigned int len);
122 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
124 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
127 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
129 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
132 unsigned int nft_parse_register(const struct nlattr *attr);
133 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
135 int nft_validate_register_load(enum nft_registers reg, unsigned int len);
136 int nft_validate_register_store(const struct nft_ctx *ctx,
137 enum nft_registers reg,
138 const struct nft_data *data,
139 enum nft_data_types type, unsigned int len);
142 * struct nft_userdata - user defined data associated with an object
144 * @len: length of the data
147 * The presence of user data is indicated in an object specific fashion,
148 * so a length of zero can't occur and the value "len" indicates data
151 struct nft_userdata {
153 unsigned char data[0];
157 * struct nft_set_elem - generic representation of set elements
160 * @priv: element private data and extensions
162 struct nft_set_elem {
164 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
171 struct nft_set_iter {
175 int (*fn)(const struct nft_ctx *ctx,
176 const struct nft_set *set,
177 const struct nft_set_iter *iter,
178 const struct nft_set_elem *elem);
182 * struct nft_set_desc - description of set elements
186 * @size: number of set elements
188 struct nft_set_desc {
195 * enum nft_set_class - performance class
197 * @NFT_LOOKUP_O_1: constant, O(1)
198 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
199 * @NFT_LOOKUP_O_N: linear, O(N)
203 NFT_SET_CLASS_O_LOG_N,
208 * struct nft_set_estimate - estimation of memory and performance
211 * @size: required memory
212 * @class: lookup performance class
214 struct nft_set_estimate {
216 enum nft_set_class class;
223 * struct nft_set_ops - nf_tables set operations
225 * @lookup: look up an element within the set
226 * @insert: insert new element into set
227 * @activate: activate new element in the next generation
228 * @deactivate: deactivate element in the next generation
229 * @remove: remove element from set
230 * @walk: iterate over all set elemeennts
231 * @privsize: function to return size of set private data
232 * @init: initialize private data of new set instance
233 * @destroy: destroy private data of set instance
234 * @list: nf_tables_set_ops list node
235 * @owner: module reference
236 * @elemsize: element private size
237 * @features: features supported by the implementation
240 bool (*lookup)(const struct nft_set *set,
242 const struct nft_set_ext **ext);
243 bool (*update)(struct nft_set *set,
245 void *(*new)(struct nft_set *,
246 const struct nft_expr *,
248 const struct nft_expr *expr,
249 struct nft_regs *regs,
250 const struct nft_set_ext **ext);
252 int (*insert)(const struct nft_set *set,
253 const struct nft_set_elem *elem);
254 void (*activate)(const struct nft_set *set,
255 const struct nft_set_elem *elem);
256 void * (*deactivate)(const struct nft_set *set,
257 const struct nft_set_elem *elem);
258 void (*remove)(const struct nft_set *set,
259 const struct nft_set_elem *elem);
260 void (*walk)(const struct nft_ctx *ctx,
261 const struct nft_set *set,
262 struct nft_set_iter *iter);
264 unsigned int (*privsize)(const struct nlattr * const nla[]);
265 bool (*estimate)(const struct nft_set_desc *desc,
267 struct nft_set_estimate *est);
268 int (*init)(const struct nft_set *set,
269 const struct nft_set_desc *desc,
270 const struct nlattr * const nla[]);
271 void (*destroy)(const struct nft_set *set);
273 struct list_head list;
274 struct module *owner;
275 unsigned int elemsize;
279 int nft_register_set(struct nft_set_ops *ops);
280 void nft_unregister_set(struct nft_set_ops *ops);
283 * struct nft_set - nf_tables set instance
285 * @list: table set list node
286 * @bindings: list of set bindings
287 * @name: name of the set
288 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
289 * @dtype: data type (verdict or numeric type defined by userspace)
290 * @size: maximum set size
291 * @nelems: number of elements
292 * @ndeact: number of deactivated elements queued for removal
293 * @timeout: default timeout value in msecs
294 * @gc_int: garbage collection interval in msecs
295 * @policy: set parameterization (see enum nft_set_policies)
297 * @pnet: network namespace
301 * @data: private set data
304 struct list_head list;
305 struct list_head bindings;
315 /* runtime data below here */
316 const struct nft_set_ops *ops ____cacheline_aligned;
322 __attribute__((aligned(__alignof__(u64))));
325 static inline void *nft_set_priv(const struct nft_set *set)
327 return (void *)set->data;
330 static inline struct nft_set *nft_set_container_of(const void *priv)
332 return (void *)priv - offsetof(struct nft_set, data);
335 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
336 const struct nlattr *nla);
337 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
338 const struct nlattr *nla);
340 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
342 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
346 * struct nft_set_binding - nf_tables set binding
348 * @list: set bindings list node
349 * @chain: chain containing the rule bound to the set
350 * @flags: set action flags
352 * A set binding contains all information necessary for validation
353 * of new elements added to a bound set.
355 struct nft_set_binding {
356 struct list_head list;
357 const struct nft_chain *chain;
361 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
362 struct nft_set_binding *binding);
363 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
364 struct nft_set_binding *binding);
367 * enum nft_set_extensions - set extension type IDs
369 * @NFT_SET_EXT_KEY: element key
370 * @NFT_SET_EXT_DATA: mapping data
371 * @NFT_SET_EXT_FLAGS: element flags
372 * @NFT_SET_EXT_TIMEOUT: element timeout
373 * @NFT_SET_EXT_EXPIRATION: element expiration time
374 * @NFT_SET_EXT_USERDATA: user data associated with the element
375 * @NFT_SET_EXT_EXPR: expression assiociated with the element
376 * @NFT_SET_EXT_NUM: number of extension types
378 enum nft_set_extensions {
383 NFT_SET_EXT_EXPIRATION,
384 NFT_SET_EXT_USERDATA,
390 * struct nft_set_ext_type - set extension type
392 * @len: fixed part length of the extension
393 * @align: alignment requirements of the extension
395 struct nft_set_ext_type {
400 extern const struct nft_set_ext_type nft_set_ext_types[];
403 * struct nft_set_ext_tmpl - set extension template
405 * @len: length of extension area
406 * @offset: offsets of individual extension types
408 struct nft_set_ext_tmpl {
410 u8 offset[NFT_SET_EXT_NUM];
414 * struct nft_set_ext - set extensions
416 * @genmask: generation mask
417 * @offset: offsets of individual extension types
418 * @data: beginning of extension data
422 u8 offset[NFT_SET_EXT_NUM];
426 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
428 memset(tmpl, 0, sizeof(*tmpl));
429 tmpl->len = sizeof(struct nft_set_ext);
432 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
435 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
436 BUG_ON(tmpl->len > U8_MAX);
437 tmpl->offset[id] = tmpl->len;
438 tmpl->len += nft_set_ext_types[id].len + len;
441 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
443 nft_set_ext_add_length(tmpl, id, 0);
446 static inline void nft_set_ext_init(struct nft_set_ext *ext,
447 const struct nft_set_ext_tmpl *tmpl)
449 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
452 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
454 return !!ext->offset[id];
457 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
459 return ext && __nft_set_ext_exists(ext, id);
462 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
464 return (void *)ext + ext->offset[id];
467 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
469 return nft_set_ext(ext, NFT_SET_EXT_KEY);
472 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
474 return nft_set_ext(ext, NFT_SET_EXT_DATA);
477 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
479 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
482 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
484 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
487 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext)
489 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
492 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
494 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
497 static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
499 return nft_set_ext(ext, NFT_SET_EXT_EXPR);
502 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
504 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
505 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext));
508 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
511 return elem + set->ops->elemsize;
514 void *nft_set_elem_init(const struct nft_set *set,
515 const struct nft_set_ext_tmpl *tmpl,
516 const u32 *key, const u32 *data,
517 u64 timeout, gfp_t gfp);
518 void nft_set_elem_destroy(const struct nft_set *set, void *elem);
521 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
524 * @set: set the elements belong to
525 * @cnt: count of elements
527 struct nft_set_gc_batch_head {
529 const struct nft_set *set;
533 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
534 sizeof(struct nft_set_gc_batch_head)) / \
538 * struct nft_set_gc_batch - nf_tables set garbage collection batch
540 * @head: GC batch head
541 * @elems: garbage collection elements
543 struct nft_set_gc_batch {
544 struct nft_set_gc_batch_head head;
545 void *elems[NFT_SET_GC_BATCH_SIZE];
548 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
550 void nft_set_gc_batch_release(struct rcu_head *rcu);
552 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
555 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
558 static inline struct nft_set_gc_batch *
559 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
563 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
565 nft_set_gc_batch_complete(gcb);
567 return nft_set_gc_batch_alloc(set, gfp);
570 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
573 gcb->elems[gcb->head.cnt++] = elem;
577 * struct nft_expr_type - nf_tables expression type
579 * @select_ops: function to select nft_expr_ops
580 * @ops: default ops, used when no select_ops functions is present
581 * @list: used internally
583 * @owner: module reference
584 * @policy: netlink attribute policy
585 * @maxattr: highest netlink attribute number
586 * @family: address family for AF-specific types
587 * @flags: expression type flags
589 struct nft_expr_type {
590 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
591 const struct nlattr * const tb[]);
592 const struct nft_expr_ops *ops;
593 struct list_head list;
595 struct module *owner;
596 const struct nla_policy *policy;
597 unsigned int maxattr;
602 #define NFT_EXPR_STATEFUL 0x1
605 * struct nft_expr_ops - nf_tables expression operations
607 * @eval: Expression evaluation function
608 * @size: full expression size, including private data size
609 * @init: initialization function
610 * @destroy: destruction function
611 * @dump: function to dump parameters
612 * @type: expression type
613 * @validate: validate expression, called during loop detection
614 * @data: extra data to attach to this expression operation
617 struct nft_expr_ops {
618 void (*eval)(const struct nft_expr *expr,
619 struct nft_regs *regs,
620 const struct nft_pktinfo *pkt);
621 int (*clone)(struct nft_expr *dst,
622 const struct nft_expr *src);
625 int (*init)(const struct nft_ctx *ctx,
626 const struct nft_expr *expr,
627 const struct nlattr * const tb[]);
628 void (*destroy)(const struct nft_ctx *ctx,
629 const struct nft_expr *expr);
630 int (*dump)(struct sk_buff *skb,
631 const struct nft_expr *expr);
632 int (*validate)(const struct nft_ctx *ctx,
633 const struct nft_expr *expr,
634 const struct nft_data **data);
635 const struct nft_expr_type *type;
639 #define NFT_EXPR_MAXATTR 16
640 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
641 ALIGN(size, __alignof__(struct nft_expr)))
644 * struct nft_expr - nf_tables expression
646 * @ops: expression ops
647 * @data: expression private data
650 const struct nft_expr_ops *ops;
652 __attribute__((aligned(__alignof__(u64))));
655 static inline void *nft_expr_priv(const struct nft_expr *expr)
657 return (void *)expr->data;
660 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
661 const struct nlattr *nla);
662 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
663 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
664 const struct nft_expr *expr);
666 static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
670 __module_get(src->ops->type->owner);
671 if (src->ops->clone) {
673 err = src->ops->clone(dst, src);
677 memcpy(dst, src, src->ops->size);
683 * struct nft_rule - nf_tables rule
685 * @list: used internally
686 * @handle: rule handle
687 * @genmask: generation mask
688 * @dlen: length of expression data
689 * @udata: user data is appended to the rule
690 * @data: expression data
693 struct list_head list;
699 __attribute__((aligned(__alignof__(struct nft_expr))));
702 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
704 return (struct nft_expr *)&rule->data[0];
707 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
709 return ((void *)expr) + expr->ops->size;
712 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
714 return (struct nft_expr *)&rule->data[rule->dlen];
717 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
719 return (void *)&rule->data[rule->dlen];
723 * The last pointer isn't really necessary, but the compiler isn't able to
724 * determine that the result of nft_expr_last() is always the same since it
725 * can't assume that the dlen value wasn't changed within calls in the loop.
727 #define nft_rule_for_each_expr(expr, last, rule) \
728 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
730 (expr) = nft_expr_next(expr))
732 enum nft_chain_flags {
733 NFT_BASE_CHAIN = 0x1,
734 NFT_CHAIN_INACTIVE = 0x2,
738 * struct nft_chain - nf_tables chain
740 * @rules: list of rules in the chain
741 * @list: used internally
742 * @table: table that this chain belongs to
743 * @handle: chain handle
744 * @use: number of jump references to this chain
745 * @level: length of longest path to this chain
746 * @flags: bitmask of enum nft_chain_flags
747 * @name: name of the chain
750 struct list_head rules;
751 struct list_head list;
752 struct nft_table *table;
757 char name[NFT_CHAIN_MAXNAMELEN];
760 enum nft_chain_type {
761 NFT_CHAIN_T_DEFAULT = 0,
768 * struct nf_chain_type - nf_tables chain type info
770 * @name: name of the type
771 * @type: numeric identifier
772 * @family: address family
773 * @owner: module owner
774 * @hook_mask: mask of valid hooks
775 * @hooks: hookfn overrides
777 struct nf_chain_type {
779 enum nft_chain_type type;
781 struct module *owner;
782 unsigned int hook_mask;
783 nf_hookfn *hooks[NF_MAX_HOOKS];
786 int nft_chain_validate_dependency(const struct nft_chain *chain,
787 enum nft_chain_type type);
788 int nft_chain_validate_hooks(const struct nft_chain *chain,
789 unsigned int hook_flags);
794 struct u64_stats_sync syncp;
797 #define NFT_HOOK_OPS_MAX 2
798 #define NFT_BASECHAIN_DISABLED (1 << 0)
801 * struct nft_base_chain - nf_tables base chain
803 * @ops: netfilter hook ops
804 * @pnet: net namespace that this chain belongs to
806 * @policy: default policy
807 * @stats: per-cpu chain stats
809 * @dev_name: device name that this base chain is attached to (if any)
811 struct nft_base_chain {
812 struct nf_hook_ops ops[NFT_HOOK_OPS_MAX];
814 const struct nf_chain_type *type;
817 struct nft_stats __percpu *stats;
818 struct nft_chain chain;
819 char dev_name[IFNAMSIZ];
822 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
824 return container_of(chain, struct nft_base_chain, chain);
827 int nft_register_basechain(struct nft_base_chain *basechain,
828 unsigned int hook_nops);
829 void nft_unregister_basechain(struct nft_base_chain *basechain,
830 unsigned int hook_nops);
832 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
835 * struct nft_table - nf_tables table
837 * @list: used internally
838 * @chains: chains in the table
839 * @sets: sets in the table
840 * @hgenerator: handle generator state
841 * @use: number of chain references to this table
842 * @flags: table flag (see enum nft_table_flags)
843 * @name: name of the table
846 struct list_head list;
847 struct list_head chains;
848 struct list_head sets;
852 char name[NFT_TABLE_MAXNAMELEN];
856 NFT_AF_NEEDS_DEV = (1 << 0),
860 * struct nft_af_info - nf_tables address family info
862 * @list: used internally
863 * @family: address family
864 * @nhooks: number of hooks in this family
865 * @owner: module owner
866 * @tables: used internally
867 * @flags: family flags
868 * @nops: number of hook ops in this family
869 * @hook_ops_init: initialization function for chain hook ops
870 * @hooks: hookfn overrides for packet validation
873 struct list_head list;
876 struct module *owner;
877 struct list_head tables;
880 void (*hook_ops_init)(struct nf_hook_ops *,
882 nf_hookfn *hooks[NF_MAX_HOOKS];
885 int nft_register_afinfo(struct net *, struct nft_af_info *);
886 void nft_unregister_afinfo(struct nft_af_info *);
888 int nft_register_chain_type(const struct nf_chain_type *);
889 void nft_unregister_chain_type(const struct nf_chain_type *);
891 int nft_register_expr(struct nft_expr_type *);
892 void nft_unregister_expr(struct nft_expr_type *);
894 #define nft_dereference(p) \
895 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
897 #define MODULE_ALIAS_NFT_FAMILY(family) \
898 MODULE_ALIAS("nft-afinfo-" __stringify(family))
900 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
901 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
903 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
904 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
906 #define MODULE_ALIAS_NFT_EXPR(name) \
907 MODULE_ALIAS("nft-expr-" name)
909 #define MODULE_ALIAS_NFT_SET() \
910 MODULE_ALIAS("nft-set")
913 * The gencursor defines two generations, the currently active and the
914 * next one. Objects contain a bitmask of 2 bits specifying the generations
915 * they're active in. A set bit means they're inactive in the generation
916 * represented by that bit.
918 * New objects start out as inactive in the current and active in the
919 * next generation. When committing the ruleset the bitmask is cleared,
920 * meaning they're active in all generations. When removing an object,
921 * it is set inactive in the next generation. After committing the ruleset,
922 * the objects are removed.
924 static inline unsigned int nft_gencursor_next(const struct net *net)
926 return net->nft.gencursor + 1 == 1 ? 1 : 0;
929 static inline u8 nft_genmask_next(const struct net *net)
931 return 1 << nft_gencursor_next(net);
934 static inline u8 nft_genmask_cur(const struct net *net)
936 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
937 return 1 << ACCESS_ONCE(net->nft.gencursor);
940 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
943 * Set element transaction helpers
946 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
949 return !(ext->genmask & genmask);
952 static inline void nft_set_elem_change_active(const struct nft_set *set,
953 struct nft_set_ext *ext)
955 ext->genmask ^= nft_genmask_next(read_pnet(&set->pnet));
959 * We use a free bit in the genmask field to indicate the element
960 * is busy, meaning it is currently being processed either by
961 * the netlink API or GC.
963 * Even though the genmask is only a single byte wide, this works
964 * because the extension structure if fully constant once initialized,
965 * so there are no non-atomic write accesses unless it is already
968 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
970 #if defined(__LITTLE_ENDIAN_BITFIELD)
971 #define NFT_SET_ELEM_BUSY_BIT 2
972 #elif defined(__BIG_ENDIAN_BITFIELD)
973 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
978 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
980 unsigned long *word = (unsigned long *)ext;
982 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
983 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
986 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
988 unsigned long *word = (unsigned long *)ext;
990 clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
994 * struct nft_trans - nf_tables object update in transaction
996 * @list: used internally
997 * @msg_type: message type
998 * @ctx: transaction context
999 * @data: internal information related to the transaction
1002 struct list_head list;
1008 struct nft_trans_rule {
1009 struct nft_rule *rule;
1012 #define nft_trans_rule(trans) \
1013 (((struct nft_trans_rule *)trans->data)->rule)
1015 struct nft_trans_set {
1016 struct nft_set *set;
1020 #define nft_trans_set(trans) \
1021 (((struct nft_trans_set *)trans->data)->set)
1022 #define nft_trans_set_id(trans) \
1023 (((struct nft_trans_set *)trans->data)->set_id)
1025 struct nft_trans_chain {
1027 char name[NFT_CHAIN_MAXNAMELEN];
1028 struct nft_stats __percpu *stats;
1032 #define nft_trans_chain_update(trans) \
1033 (((struct nft_trans_chain *)trans->data)->update)
1034 #define nft_trans_chain_name(trans) \
1035 (((struct nft_trans_chain *)trans->data)->name)
1036 #define nft_trans_chain_stats(trans) \
1037 (((struct nft_trans_chain *)trans->data)->stats)
1038 #define nft_trans_chain_policy(trans) \
1039 (((struct nft_trans_chain *)trans->data)->policy)
1041 struct nft_trans_table {
1046 #define nft_trans_table_update(trans) \
1047 (((struct nft_trans_table *)trans->data)->update)
1048 #define nft_trans_table_enable(trans) \
1049 (((struct nft_trans_table *)trans->data)->enable)
1051 struct nft_trans_elem {
1052 struct nft_set *set;
1053 struct nft_set_elem elem;
1056 #define nft_trans_elem_set(trans) \
1057 (((struct nft_trans_elem *)trans->data)->set)
1058 #define nft_trans_elem(trans) \
1059 (((struct nft_trans_elem *)trans->data)->elem)
1061 #endif /* _NET_NF_TABLES_H */