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;
23 /* for x_tables compatibility */
24 struct xt_action_param xt;
27 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
29 const struct nf_hook_state *state)
32 pkt->net = pkt->xt.net = state->net;
33 pkt->in = pkt->xt.in = state->in;
34 pkt->out = pkt->xt.out = state->out;
35 pkt->hook = pkt->xt.hooknum = state->hook;
36 pkt->pf = pkt->xt.family = state->pf;
40 * struct nft_verdict - nf_tables verdict
42 * @code: nf_tables/netfilter verdict code
43 * @chain: destination chain for NFT_JUMP/NFT_GOTO
47 struct nft_chain *chain;
53 struct nft_verdict verdict;
55 } __attribute__((aligned(__alignof__(u64))));
58 * struct nft_regs - nf_tables register set
60 * @data: data registers
61 * @verdict: verdict register
63 * The first four data registers alias to the verdict register.
68 struct nft_verdict verdict;
72 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
75 memcpy(dst, src, len);
78 static inline void nft_data_debug(const struct nft_data *data)
80 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
81 data->data[0], data->data[1],
82 data->data[2], data->data[3]);
86 * struct nft_ctx - nf_tables rule/set context
89 * @afi: address family info
90 * @table: the table the chain is contained in
91 * @chain: the chain the rule is contained in
92 * @nla: netlink attributes
93 * @portid: netlink portID of the original message
94 * @seq: netlink sequence number
95 * @report: notify via unicast netlink message
99 struct nft_af_info *afi;
100 struct nft_table *table;
101 struct nft_chain *chain;
102 const struct nlattr * const *nla;
108 struct nft_data_desc {
109 enum nft_data_types type;
113 int nft_data_init(const struct nft_ctx *ctx,
114 struct nft_data *data, unsigned int size,
115 struct nft_data_desc *desc, const struct nlattr *nla);
116 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type);
117 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
118 enum nft_data_types type, unsigned int len);
120 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
122 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
125 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
127 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
130 unsigned int nft_parse_register(const struct nlattr *attr);
131 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
133 int nft_validate_register_load(enum nft_registers reg, unsigned int len);
134 int nft_validate_register_store(const struct nft_ctx *ctx,
135 enum nft_registers reg,
136 const struct nft_data *data,
137 enum nft_data_types type, unsigned int len);
140 * struct nft_userdata - user defined data associated with an object
142 * @len: length of the data
145 * The presence of user data is indicated in an object specific fashion,
146 * so a length of zero can't occur and the value "len" indicates data
149 struct nft_userdata {
151 unsigned char data[0];
155 * struct nft_set_elem - generic representation of set elements
158 * @priv: element private data and extensions
160 struct nft_set_elem {
162 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
169 struct nft_set_iter {
173 int (*fn)(const struct nft_ctx *ctx,
174 const struct nft_set *set,
175 const struct nft_set_iter *iter,
176 const struct nft_set_elem *elem);
180 * struct nft_set_desc - description of set elements
184 * @size: number of set elements
186 struct nft_set_desc {
193 * enum nft_set_class - performance class
195 * @NFT_LOOKUP_O_1: constant, O(1)
196 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
197 * @NFT_LOOKUP_O_N: linear, O(N)
201 NFT_SET_CLASS_O_LOG_N,
206 * struct nft_set_estimate - estimation of memory and performance
209 * @size: required memory
210 * @class: lookup performance class
212 struct nft_set_estimate {
214 enum nft_set_class class;
221 * struct nft_set_ops - nf_tables set operations
223 * @lookup: look up an element within the set
224 * @insert: insert new element into set
225 * @activate: activate new element in the next generation
226 * @deactivate: deactivate element in the next generation
227 * @remove: remove element from set
228 * @walk: iterate over all set elemeennts
229 * @privsize: function to return size of set private data
230 * @init: initialize private data of new set instance
231 * @destroy: destroy private data of set instance
232 * @list: nf_tables_set_ops list node
233 * @owner: module reference
234 * @elemsize: element private size
235 * @features: features supported by the implementation
238 bool (*lookup)(const struct nft_set *set,
240 const struct nft_set_ext **ext);
241 bool (*update)(struct nft_set *set,
243 void *(*new)(struct nft_set *,
244 const struct nft_expr *,
246 const struct nft_expr *expr,
247 struct nft_regs *regs,
248 const struct nft_set_ext **ext);
250 int (*insert)(const struct nft_set *set,
251 const struct nft_set_elem *elem);
252 void (*activate)(const struct nft_set *set,
253 const struct nft_set_elem *elem);
254 void * (*deactivate)(const struct nft_set *set,
255 const struct nft_set_elem *elem);
256 void (*remove)(const struct nft_set *set,
257 const struct nft_set_elem *elem);
258 void (*walk)(const struct nft_ctx *ctx,
259 const struct nft_set *set,
260 struct nft_set_iter *iter);
262 unsigned int (*privsize)(const struct nlattr * const nla[]);
263 bool (*estimate)(const struct nft_set_desc *desc,
265 struct nft_set_estimate *est);
266 int (*init)(const struct nft_set *set,
267 const struct nft_set_desc *desc,
268 const struct nlattr * const nla[]);
269 void (*destroy)(const struct nft_set *set);
271 struct list_head list;
272 struct module *owner;
273 unsigned int elemsize;
277 int nft_register_set(struct nft_set_ops *ops);
278 void nft_unregister_set(struct nft_set_ops *ops);
281 * struct nft_set - nf_tables set instance
283 * @list: table set list node
284 * @bindings: list of set bindings
285 * @name: name of the set
286 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
287 * @dtype: data type (verdict or numeric type defined by userspace)
288 * @size: maximum set size
289 * @nelems: number of elements
290 * @ndeact: number of deactivated elements queued for removal
291 * @timeout: default timeout value in msecs
292 * @gc_int: garbage collection interval in msecs
293 * @policy: set parameterization (see enum nft_set_policies)
294 * @udlen: user data length
297 * @pnet: network namespace
299 * @genmask: generation mask
302 * @data: private set data
305 struct list_head list;
306 struct list_head bindings;
307 char name[NFT_SET_MAXNAMELEN];
317 unsigned char *udata;
318 /* runtime data below here */
319 const struct nft_set_ops *ops ____cacheline_aligned;
326 __attribute__((aligned(__alignof__(u64))));
329 static inline void *nft_set_priv(const struct nft_set *set)
331 return (void *)set->data;
334 static inline struct nft_set *nft_set_container_of(const void *priv)
336 return (void *)priv - offsetof(struct nft_set, data);
339 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
340 const struct nlattr *nla, u8 genmask);
341 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
342 const struct nlattr *nla, u8 genmask);
344 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
346 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
350 * struct nft_set_binding - nf_tables set binding
352 * @list: set bindings list node
353 * @chain: chain containing the rule bound to the set
354 * @flags: set action flags
356 * A set binding contains all information necessary for validation
357 * of new elements added to a bound set.
359 struct nft_set_binding {
360 struct list_head list;
361 const struct nft_chain *chain;
365 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
366 struct nft_set_binding *binding);
367 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
368 struct nft_set_binding *binding);
371 * enum nft_set_extensions - set extension type IDs
373 * @NFT_SET_EXT_KEY: element key
374 * @NFT_SET_EXT_DATA: mapping data
375 * @NFT_SET_EXT_FLAGS: element flags
376 * @NFT_SET_EXT_TIMEOUT: element timeout
377 * @NFT_SET_EXT_EXPIRATION: element expiration time
378 * @NFT_SET_EXT_USERDATA: user data associated with the element
379 * @NFT_SET_EXT_EXPR: expression assiociated with the element
380 * @NFT_SET_EXT_NUM: number of extension types
382 enum nft_set_extensions {
387 NFT_SET_EXT_EXPIRATION,
388 NFT_SET_EXT_USERDATA,
394 * struct nft_set_ext_type - set extension type
396 * @len: fixed part length of the extension
397 * @align: alignment requirements of the extension
399 struct nft_set_ext_type {
404 extern const struct nft_set_ext_type nft_set_ext_types[];
407 * struct nft_set_ext_tmpl - set extension template
409 * @len: length of extension area
410 * @offset: offsets of individual extension types
412 struct nft_set_ext_tmpl {
414 u8 offset[NFT_SET_EXT_NUM];
418 * struct nft_set_ext - set extensions
420 * @genmask: generation mask
421 * @offset: offsets of individual extension types
422 * @data: beginning of extension data
426 u8 offset[NFT_SET_EXT_NUM];
430 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
432 memset(tmpl, 0, sizeof(*tmpl));
433 tmpl->len = sizeof(struct nft_set_ext);
436 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
439 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
440 BUG_ON(tmpl->len > U8_MAX);
441 tmpl->offset[id] = tmpl->len;
442 tmpl->len += nft_set_ext_types[id].len + len;
445 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
447 nft_set_ext_add_length(tmpl, id, 0);
450 static inline void nft_set_ext_init(struct nft_set_ext *ext,
451 const struct nft_set_ext_tmpl *tmpl)
453 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
456 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
458 return !!ext->offset[id];
461 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
463 return ext && __nft_set_ext_exists(ext, id);
466 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
468 return (void *)ext + ext->offset[id];
471 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
473 return nft_set_ext(ext, NFT_SET_EXT_KEY);
476 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
478 return nft_set_ext(ext, NFT_SET_EXT_DATA);
481 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
483 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
486 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
488 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
491 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext)
493 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
496 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
498 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
501 static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
503 return nft_set_ext(ext, NFT_SET_EXT_EXPR);
506 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
508 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
509 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext));
512 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
515 return elem + set->ops->elemsize;
518 void *nft_set_elem_init(const struct nft_set *set,
519 const struct nft_set_ext_tmpl *tmpl,
520 const u32 *key, const u32 *data,
521 u64 timeout, gfp_t gfp);
522 void nft_set_elem_destroy(const struct nft_set *set, void *elem);
525 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
528 * @set: set the elements belong to
529 * @cnt: count of elements
531 struct nft_set_gc_batch_head {
533 const struct nft_set *set;
537 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
538 sizeof(struct nft_set_gc_batch_head)) / \
542 * struct nft_set_gc_batch - nf_tables set garbage collection batch
544 * @head: GC batch head
545 * @elems: garbage collection elements
547 struct nft_set_gc_batch {
548 struct nft_set_gc_batch_head head;
549 void *elems[NFT_SET_GC_BATCH_SIZE];
552 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
554 void nft_set_gc_batch_release(struct rcu_head *rcu);
556 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
559 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
562 static inline struct nft_set_gc_batch *
563 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
567 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
569 nft_set_gc_batch_complete(gcb);
571 return nft_set_gc_batch_alloc(set, gfp);
574 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
577 gcb->elems[gcb->head.cnt++] = elem;
581 * struct nft_expr_type - nf_tables expression type
583 * @select_ops: function to select nft_expr_ops
584 * @ops: default ops, used when no select_ops functions is present
585 * @list: used internally
587 * @owner: module reference
588 * @policy: netlink attribute policy
589 * @maxattr: highest netlink attribute number
590 * @family: address family for AF-specific types
591 * @flags: expression type flags
593 struct nft_expr_type {
594 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
595 const struct nlattr * const tb[]);
596 const struct nft_expr_ops *ops;
597 struct list_head list;
599 struct module *owner;
600 const struct nla_policy *policy;
601 unsigned int maxattr;
606 #define NFT_EXPR_STATEFUL 0x1
609 * struct nft_expr_ops - nf_tables expression operations
611 * @eval: Expression evaluation function
612 * @size: full expression size, including private data size
613 * @init: initialization function
614 * @destroy: destruction function
615 * @dump: function to dump parameters
616 * @type: expression type
617 * @validate: validate expression, called during loop detection
618 * @data: extra data to attach to this expression operation
621 struct nft_expr_ops {
622 void (*eval)(const struct nft_expr *expr,
623 struct nft_regs *regs,
624 const struct nft_pktinfo *pkt);
625 int (*clone)(struct nft_expr *dst,
626 const struct nft_expr *src);
629 int (*init)(const struct nft_ctx *ctx,
630 const struct nft_expr *expr,
631 const struct nlattr * const tb[]);
632 void (*destroy)(const struct nft_ctx *ctx,
633 const struct nft_expr *expr);
634 int (*dump)(struct sk_buff *skb,
635 const struct nft_expr *expr);
636 int (*validate)(const struct nft_ctx *ctx,
637 const struct nft_expr *expr,
638 const struct nft_data **data);
639 const struct nft_expr_type *type;
643 #define NFT_EXPR_MAXATTR 16
644 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
645 ALIGN(size, __alignof__(struct nft_expr)))
648 * struct nft_expr - nf_tables expression
650 * @ops: expression ops
651 * @data: expression private data
654 const struct nft_expr_ops *ops;
655 unsigned char data[];
658 static inline void *nft_expr_priv(const struct nft_expr *expr)
660 return (void *)expr->data;
663 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
664 const struct nlattr *nla);
665 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
666 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
667 const struct nft_expr *expr);
669 static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
673 __module_get(src->ops->type->owner);
674 if (src->ops->clone) {
676 err = src->ops->clone(dst, src);
680 memcpy(dst, src, src->ops->size);
686 * struct nft_rule - nf_tables rule
688 * @list: used internally
689 * @handle: rule handle
690 * @genmask: generation mask
691 * @dlen: length of expression data
692 * @udata: user data is appended to the rule
693 * @data: expression data
696 struct list_head list;
702 __attribute__((aligned(__alignof__(struct nft_expr))));
705 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
707 return (struct nft_expr *)&rule->data[0];
710 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
712 return ((void *)expr) + expr->ops->size;
715 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
717 return (struct nft_expr *)&rule->data[rule->dlen];
720 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
722 return (void *)&rule->data[rule->dlen];
726 * The last pointer isn't really necessary, but the compiler isn't able to
727 * determine that the result of nft_expr_last() is always the same since it
728 * can't assume that the dlen value wasn't changed within calls in the loop.
730 #define nft_rule_for_each_expr(expr, last, rule) \
731 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
733 (expr) = nft_expr_next(expr))
735 enum nft_chain_flags {
736 NFT_BASE_CHAIN = 0x1,
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;
760 char name[NFT_CHAIN_MAXNAMELEN];
763 enum nft_chain_type {
764 NFT_CHAIN_T_DEFAULT = 0,
771 * struct nf_chain_type - nf_tables chain type info
773 * @name: name of the type
774 * @type: numeric identifier
775 * @family: address family
776 * @owner: module owner
777 * @hook_mask: mask of valid hooks
778 * @hooks: hookfn overrides
780 struct nf_chain_type {
782 enum nft_chain_type type;
784 struct module *owner;
785 unsigned int hook_mask;
786 nf_hookfn *hooks[NF_MAX_HOOKS];
789 int nft_chain_validate_dependency(const struct nft_chain *chain,
790 enum nft_chain_type type);
791 int nft_chain_validate_hooks(const struct nft_chain *chain,
792 unsigned int hook_flags);
797 struct u64_stats_sync syncp;
800 #define NFT_HOOK_OPS_MAX 2
801 #define NFT_BASECHAIN_DISABLED (1 << 0)
804 * struct nft_base_chain - nf_tables base chain
806 * @ops: netfilter hook ops
807 * @pnet: net namespace that this chain belongs to
809 * @policy: default policy
810 * @stats: per-cpu chain stats
812 * @dev_name: device name that this base chain is attached to (if any)
814 struct nft_base_chain {
815 struct nf_hook_ops ops[NFT_HOOK_OPS_MAX];
817 const struct nf_chain_type *type;
820 struct nft_stats __percpu *stats;
821 struct nft_chain chain;
822 char dev_name[IFNAMSIZ];
825 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
827 return container_of(chain, struct nft_base_chain, chain);
830 int __nft_release_basechain(struct nft_ctx *ctx);
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 * @genmask: generation mask
844 * @name: name of the table
847 struct list_head list;
848 struct list_head chains;
849 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 net *, 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 int nft_verdict_dump(struct sk_buff *skb, int type,
897 const struct nft_verdict *v);
900 * struct nft_traceinfo - nft tracing information and state
902 * @pkt: pktinfo currently processed
903 * @basechain: base chain currently processed
904 * @chain: chain currently processed
905 * @rule: rule that was evaluated
906 * @verdict: verdict given by rule
907 * @type: event type (enum nft_trace_types)
908 * @packet_dumped: packet headers sent in a previous traceinfo message
909 * @trace: other struct members are initialised
911 struct nft_traceinfo {
912 const struct nft_pktinfo *pkt;
913 const struct nft_base_chain *basechain;
914 const struct nft_chain *chain;
915 const struct nft_rule *rule;
916 const struct nft_verdict *verdict;
917 enum nft_trace_types type;
922 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
923 const struct nft_verdict *verdict,
924 const struct nft_chain *basechain);
926 void nft_trace_notify(struct nft_traceinfo *info);
928 #define nft_dereference(p) \
929 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
931 #define MODULE_ALIAS_NFT_FAMILY(family) \
932 MODULE_ALIAS("nft-afinfo-" __stringify(family))
934 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
935 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
937 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
938 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
940 #define MODULE_ALIAS_NFT_EXPR(name) \
941 MODULE_ALIAS("nft-expr-" name)
943 #define MODULE_ALIAS_NFT_SET() \
944 MODULE_ALIAS("nft-set")
947 * The gencursor defines two generations, the currently active and the
948 * next one. Objects contain a bitmask of 2 bits specifying the generations
949 * they're active in. A set bit means they're inactive in the generation
950 * represented by that bit.
952 * New objects start out as inactive in the current and active in the
953 * next generation. When committing the ruleset the bitmask is cleared,
954 * meaning they're active in all generations. When removing an object,
955 * it is set inactive in the next generation. After committing the ruleset,
956 * the objects are removed.
958 static inline unsigned int nft_gencursor_next(const struct net *net)
960 return net->nft.gencursor + 1 == 1 ? 1 : 0;
963 static inline u8 nft_genmask_next(const struct net *net)
965 return 1 << nft_gencursor_next(net);
968 static inline u8 nft_genmask_cur(const struct net *net)
970 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
971 return 1 << ACCESS_ONCE(net->nft.gencursor);
974 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
977 * Generic transaction helpers
980 /* Check if this object is currently active. */
981 #define nft_is_active(__net, __obj) \
982 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
984 /* Check if this object is active in the next generation. */
985 #define nft_is_active_next(__net, __obj) \
986 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
988 /* This object becomes active in the next generation. */
989 #define nft_activate_next(__net, __obj) \
990 (__obj)->genmask = nft_genmask_cur(__net)
992 /* This object becomes inactive in the next generation. */
993 #define nft_deactivate_next(__net, __obj) \
994 (__obj)->genmask = nft_genmask_next(__net)
996 /* After committing the ruleset, clear the stale generation bit. */
997 #define nft_clear(__net, __obj) \
998 (__obj)->genmask &= ~nft_genmask_next(__net)
999 #define nft_active_genmask(__obj, __genmask) \
1000 !((__obj)->genmask & __genmask)
1003 * Set element transaction helpers
1006 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1009 return !(ext->genmask & genmask);
1012 static inline void nft_set_elem_change_active(const struct nft_set *set,
1013 struct nft_set_ext *ext)
1015 ext->genmask ^= nft_genmask_next(read_pnet(&set->pnet));
1019 * We use a free bit in the genmask field to indicate the element
1020 * is busy, meaning it is currently being processed either by
1021 * the netlink API or GC.
1023 * Even though the genmask is only a single byte wide, this works
1024 * because the extension structure if fully constant once initialized,
1025 * so there are no non-atomic write accesses unless it is already
1028 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
1030 #if defined(__LITTLE_ENDIAN_BITFIELD)
1031 #define NFT_SET_ELEM_BUSY_BIT 2
1032 #elif defined(__BIG_ENDIAN_BITFIELD)
1033 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1038 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
1040 unsigned long *word = (unsigned long *)ext;
1042 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1043 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
1046 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
1048 unsigned long *word = (unsigned long *)ext;
1050 clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
1054 * struct nft_trans - nf_tables object update in transaction
1056 * @list: used internally
1057 * @msg_type: message type
1058 * @ctx: transaction context
1059 * @data: internal information related to the transaction
1062 struct list_head list;
1068 struct nft_trans_rule {
1069 struct nft_rule *rule;
1072 #define nft_trans_rule(trans) \
1073 (((struct nft_trans_rule *)trans->data)->rule)
1075 struct nft_trans_set {
1076 struct nft_set *set;
1080 #define nft_trans_set(trans) \
1081 (((struct nft_trans_set *)trans->data)->set)
1082 #define nft_trans_set_id(trans) \
1083 (((struct nft_trans_set *)trans->data)->set_id)
1085 struct nft_trans_chain {
1087 char name[NFT_CHAIN_MAXNAMELEN];
1088 struct nft_stats __percpu *stats;
1092 #define nft_trans_chain_update(trans) \
1093 (((struct nft_trans_chain *)trans->data)->update)
1094 #define nft_trans_chain_name(trans) \
1095 (((struct nft_trans_chain *)trans->data)->name)
1096 #define nft_trans_chain_stats(trans) \
1097 (((struct nft_trans_chain *)trans->data)->stats)
1098 #define nft_trans_chain_policy(trans) \
1099 (((struct nft_trans_chain *)trans->data)->policy)
1101 struct nft_trans_table {
1106 #define nft_trans_table_update(trans) \
1107 (((struct nft_trans_table *)trans->data)->update)
1108 #define nft_trans_table_enable(trans) \
1109 (((struct nft_trans_table *)trans->data)->enable)
1111 struct nft_trans_elem {
1112 struct nft_set *set;
1113 struct nft_set_elem elem;
1116 #define nft_trans_elem_set(trans) \
1117 (((struct nft_trans_elem *)trans->data)->set)
1118 #define nft_trans_elem(trans) \
1119 (((struct nft_trans_elem *)trans->data)->elem)
1121 #endif /* _NET_NF_TABLES_H */