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;
24 /* for x_tables compatibility */
25 struct xt_action_param xt;
28 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
30 const struct nf_hook_state *state)
33 pkt->net = pkt->xt.net = state->net;
34 pkt->in = pkt->xt.in = state->in;
35 pkt->out = pkt->xt.out = state->out;
36 pkt->hook = pkt->xt.hooknum = state->hook;
37 pkt->pf = pkt->xt.family = state->pf;
40 static inline void nft_set_pktinfo_proto_unspec(struct nft_pktinfo *pkt,
43 pkt->tprot_set = false;
49 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt,
51 const struct nf_hook_state *state)
53 nft_set_pktinfo(pkt, skb, state);
54 nft_set_pktinfo_proto_unspec(pkt, skb);
58 * struct nft_verdict - nf_tables verdict
60 * @code: nf_tables/netfilter verdict code
61 * @chain: destination chain for NFT_JUMP/NFT_GOTO
65 struct nft_chain *chain;
71 struct nft_verdict verdict;
73 } __attribute__((aligned(__alignof__(u64))));
76 * struct nft_regs - nf_tables register set
78 * @data: data registers
79 * @verdict: verdict register
81 * The first four data registers alias to the verdict register.
86 struct nft_verdict verdict;
90 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
93 memcpy(dst, src, len);
96 static inline void nft_data_debug(const struct nft_data *data)
98 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
99 data->data[0], data->data[1],
100 data->data[2], data->data[3]);
104 * struct nft_ctx - nf_tables rule/set context
106 * @net: net namespace
107 * @afi: address family info
108 * @table: the table the chain is contained in
109 * @chain: the chain the rule is contained in
110 * @nla: netlink attributes
111 * @portid: netlink portID of the original message
112 * @seq: netlink sequence number
113 * @report: notify via unicast netlink message
117 struct nft_af_info *afi;
118 struct nft_table *table;
119 struct nft_chain *chain;
120 const struct nlattr * const *nla;
126 struct nft_data_desc {
127 enum nft_data_types type;
131 int nft_data_init(const struct nft_ctx *ctx,
132 struct nft_data *data, unsigned int size,
133 struct nft_data_desc *desc, const struct nlattr *nla);
134 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type);
135 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
136 enum nft_data_types type, unsigned int len);
138 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
140 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
143 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
145 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
148 unsigned int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
149 unsigned int nft_parse_register(const struct nlattr *attr);
150 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
152 int nft_validate_register_load(enum nft_registers reg, unsigned int len);
153 int nft_validate_register_store(const struct nft_ctx *ctx,
154 enum nft_registers reg,
155 const struct nft_data *data,
156 enum nft_data_types type, unsigned int len);
159 * struct nft_userdata - user defined data associated with an object
161 * @len: length of the data
164 * The presence of user data is indicated in an object specific fashion,
165 * so a length of zero can't occur and the value "len" indicates data
168 struct nft_userdata {
170 unsigned char data[0];
174 * struct nft_set_elem - generic representation of set elements
177 * @priv: element private data and extensions
179 struct nft_set_elem {
181 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
188 struct nft_set_iter {
193 int (*fn)(const struct nft_ctx *ctx,
194 const struct nft_set *set,
195 const struct nft_set_iter *iter,
196 const struct nft_set_elem *elem);
200 * struct nft_set_desc - description of set elements
204 * @size: number of set elements
206 struct nft_set_desc {
213 * enum nft_set_class - performance class
215 * @NFT_LOOKUP_O_1: constant, O(1)
216 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
217 * @NFT_LOOKUP_O_N: linear, O(N)
221 NFT_SET_CLASS_O_LOG_N,
226 * struct nft_set_estimate - estimation of memory and performance
229 * @size: required memory
230 * @class: lookup performance class
232 struct nft_set_estimate {
234 enum nft_set_class class;
241 * struct nft_set_ops - nf_tables set operations
243 * @lookup: look up an element within the set
244 * @insert: insert new element into set
245 * @activate: activate new element in the next generation
246 * @deactivate: deactivate element in the next generation
247 * @remove: remove element from set
248 * @walk: iterate over all set elemeennts
249 * @privsize: function to return size of set private data
250 * @init: initialize private data of new set instance
251 * @destroy: destroy private data of set instance
252 * @list: nf_tables_set_ops list node
253 * @owner: module reference
254 * @elemsize: element private size
255 * @features: features supported by the implementation
258 bool (*lookup)(const struct net *net,
259 const struct nft_set *set,
261 const struct nft_set_ext **ext);
262 bool (*update)(struct nft_set *set,
264 void *(*new)(struct nft_set *,
265 const struct nft_expr *,
267 const struct nft_expr *expr,
268 struct nft_regs *regs,
269 const struct nft_set_ext **ext);
271 int (*insert)(const struct net *net,
272 const struct nft_set *set,
273 const struct nft_set_elem *elem,
274 struct nft_set_ext **ext);
275 void (*activate)(const struct net *net,
276 const struct nft_set *set,
277 const struct nft_set_elem *elem);
278 void * (*deactivate)(const struct net *net,
279 const struct nft_set *set,
280 const struct nft_set_elem *elem);
281 void (*remove)(const struct nft_set *set,
282 const struct nft_set_elem *elem);
283 void (*walk)(const struct nft_ctx *ctx,
284 const struct nft_set *set,
285 struct nft_set_iter *iter);
287 unsigned int (*privsize)(const struct nlattr * const nla[]);
288 bool (*estimate)(const struct nft_set_desc *desc,
290 struct nft_set_estimate *est);
291 int (*init)(const struct nft_set *set,
292 const struct nft_set_desc *desc,
293 const struct nlattr * const nla[]);
294 void (*destroy)(const struct nft_set *set);
296 struct list_head list;
297 struct module *owner;
298 unsigned int elemsize;
302 int nft_register_set(struct nft_set_ops *ops);
303 void nft_unregister_set(struct nft_set_ops *ops);
306 * struct nft_set - nf_tables set instance
308 * @list: table set list node
309 * @bindings: list of set bindings
310 * @name: name of the set
311 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
312 * @dtype: data type (verdict or numeric type defined by userspace)
313 * @size: maximum set size
314 * @nelems: number of elements
315 * @ndeact: number of deactivated elements queued for removal
316 * @timeout: default timeout value in msecs
317 * @gc_int: garbage collection interval in msecs
318 * @policy: set parameterization (see enum nft_set_policies)
319 * @udlen: user data length
323 * @genmask: generation mask
326 * @data: private set data
329 struct list_head list;
330 struct list_head bindings;
331 char name[NFT_SET_MAXNAMELEN];
341 unsigned char *udata;
342 /* runtime data below here */
343 const struct nft_set_ops *ops ____cacheline_aligned;
349 __attribute__((aligned(__alignof__(u64))));
352 static inline void *nft_set_priv(const struct nft_set *set)
354 return (void *)set->data;
357 static inline struct nft_set *nft_set_container_of(const void *priv)
359 return (void *)priv - offsetof(struct nft_set, data);
362 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
363 const struct nlattr *nla, u8 genmask);
364 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
365 const struct nlattr *nla, u8 genmask);
367 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
369 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
373 * struct nft_set_binding - nf_tables set binding
375 * @list: set bindings list node
376 * @chain: chain containing the rule bound to the set
377 * @flags: set action flags
379 * A set binding contains all information necessary for validation
380 * of new elements added to a bound set.
382 struct nft_set_binding {
383 struct list_head list;
384 const struct nft_chain *chain;
388 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
389 struct nft_set_binding *binding);
390 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
391 struct nft_set_binding *binding);
394 * enum nft_set_extensions - set extension type IDs
396 * @NFT_SET_EXT_KEY: element key
397 * @NFT_SET_EXT_DATA: mapping data
398 * @NFT_SET_EXT_FLAGS: element flags
399 * @NFT_SET_EXT_TIMEOUT: element timeout
400 * @NFT_SET_EXT_EXPIRATION: element expiration time
401 * @NFT_SET_EXT_USERDATA: user data associated with the element
402 * @NFT_SET_EXT_EXPR: expression assiociated with the element
403 * @NFT_SET_EXT_NUM: number of extension types
405 enum nft_set_extensions {
410 NFT_SET_EXT_EXPIRATION,
411 NFT_SET_EXT_USERDATA,
417 * struct nft_set_ext_type - set extension type
419 * @len: fixed part length of the extension
420 * @align: alignment requirements of the extension
422 struct nft_set_ext_type {
427 extern const struct nft_set_ext_type nft_set_ext_types[];
430 * struct nft_set_ext_tmpl - set extension template
432 * @len: length of extension area
433 * @offset: offsets of individual extension types
435 struct nft_set_ext_tmpl {
437 u8 offset[NFT_SET_EXT_NUM];
441 * struct nft_set_ext - set extensions
443 * @genmask: generation mask
444 * @offset: offsets of individual extension types
445 * @data: beginning of extension data
449 u8 offset[NFT_SET_EXT_NUM];
453 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
455 memset(tmpl, 0, sizeof(*tmpl));
456 tmpl->len = sizeof(struct nft_set_ext);
459 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
462 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
463 BUG_ON(tmpl->len > U8_MAX);
464 tmpl->offset[id] = tmpl->len;
465 tmpl->len += nft_set_ext_types[id].len + len;
468 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
470 nft_set_ext_add_length(tmpl, id, 0);
473 static inline void nft_set_ext_init(struct nft_set_ext *ext,
474 const struct nft_set_ext_tmpl *tmpl)
476 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
479 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
481 return !!ext->offset[id];
484 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
486 return ext && __nft_set_ext_exists(ext, id);
489 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
491 return (void *)ext + ext->offset[id];
494 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
496 return nft_set_ext(ext, NFT_SET_EXT_KEY);
499 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
501 return nft_set_ext(ext, NFT_SET_EXT_DATA);
504 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
506 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
509 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
511 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
514 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext)
516 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
519 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
521 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
524 static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
526 return nft_set_ext(ext, NFT_SET_EXT_EXPR);
529 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
531 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
532 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext));
535 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
538 return elem + set->ops->elemsize;
541 void *nft_set_elem_init(const struct nft_set *set,
542 const struct nft_set_ext_tmpl *tmpl,
543 const u32 *key, const u32 *data,
544 u64 timeout, gfp_t gfp);
545 void nft_set_elem_destroy(const struct nft_set *set, void *elem);
548 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
551 * @set: set the elements belong to
552 * @cnt: count of elements
554 struct nft_set_gc_batch_head {
556 const struct nft_set *set;
560 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
561 sizeof(struct nft_set_gc_batch_head)) / \
565 * struct nft_set_gc_batch - nf_tables set garbage collection batch
567 * @head: GC batch head
568 * @elems: garbage collection elements
570 struct nft_set_gc_batch {
571 struct nft_set_gc_batch_head head;
572 void *elems[NFT_SET_GC_BATCH_SIZE];
575 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
577 void nft_set_gc_batch_release(struct rcu_head *rcu);
579 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
582 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
585 static inline struct nft_set_gc_batch *
586 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
590 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
592 nft_set_gc_batch_complete(gcb);
594 return nft_set_gc_batch_alloc(set, gfp);
597 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
600 gcb->elems[gcb->head.cnt++] = elem;
604 * struct nft_expr_type - nf_tables expression type
606 * @select_ops: function to select nft_expr_ops
607 * @ops: default ops, used when no select_ops functions is present
608 * @list: used internally
610 * @owner: module reference
611 * @policy: netlink attribute policy
612 * @maxattr: highest netlink attribute number
613 * @family: address family for AF-specific types
614 * @flags: expression type flags
616 struct nft_expr_type {
617 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
618 const struct nlattr * const tb[]);
619 const struct nft_expr_ops *ops;
620 struct list_head list;
622 struct module *owner;
623 const struct nla_policy *policy;
624 unsigned int maxattr;
629 #define NFT_EXPR_STATEFUL 0x1
632 * struct nft_expr_ops - nf_tables expression operations
634 * @eval: Expression evaluation function
635 * @size: full expression size, including private data size
636 * @init: initialization function
637 * @destroy: destruction function
638 * @dump: function to dump parameters
639 * @type: expression type
640 * @validate: validate expression, called during loop detection
641 * @data: extra data to attach to this expression operation
644 struct nft_expr_ops {
645 void (*eval)(const struct nft_expr *expr,
646 struct nft_regs *regs,
647 const struct nft_pktinfo *pkt);
648 int (*clone)(struct nft_expr *dst,
649 const struct nft_expr *src);
652 int (*init)(const struct nft_ctx *ctx,
653 const struct nft_expr *expr,
654 const struct nlattr * const tb[]);
655 void (*destroy)(const struct nft_ctx *ctx,
656 const struct nft_expr *expr);
657 int (*dump)(struct sk_buff *skb,
658 const struct nft_expr *expr);
659 int (*validate)(const struct nft_ctx *ctx,
660 const struct nft_expr *expr,
661 const struct nft_data **data);
662 const struct nft_expr_type *type;
666 #define NFT_EXPR_MAXATTR 16
667 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
668 ALIGN(size, __alignof__(struct nft_expr)))
671 * struct nft_expr - nf_tables expression
673 * @ops: expression ops
674 * @data: expression private data
677 const struct nft_expr_ops *ops;
678 unsigned char data[];
681 static inline void *nft_expr_priv(const struct nft_expr *expr)
683 return (void *)expr->data;
686 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
687 const struct nlattr *nla);
688 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
689 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
690 const struct nft_expr *expr);
692 static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
696 __module_get(src->ops->type->owner);
697 if (src->ops->clone) {
699 err = src->ops->clone(dst, src);
703 memcpy(dst, src, src->ops->size);
709 * struct nft_rule - nf_tables rule
711 * @list: used internally
712 * @handle: rule handle
713 * @genmask: generation mask
714 * @dlen: length of expression data
715 * @udata: user data is appended to the rule
716 * @data: expression data
719 struct list_head list;
725 __attribute__((aligned(__alignof__(struct nft_expr))));
728 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
730 return (struct nft_expr *)&rule->data[0];
733 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
735 return ((void *)expr) + expr->ops->size;
738 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
740 return (struct nft_expr *)&rule->data[rule->dlen];
743 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
745 return (void *)&rule->data[rule->dlen];
749 * The last pointer isn't really necessary, but the compiler isn't able to
750 * determine that the result of nft_expr_last() is always the same since it
751 * can't assume that the dlen value wasn't changed within calls in the loop.
753 #define nft_rule_for_each_expr(expr, last, rule) \
754 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
756 (expr) = nft_expr_next(expr))
758 enum nft_chain_flags {
759 NFT_BASE_CHAIN = 0x1,
763 * struct nft_chain - nf_tables chain
765 * @rules: list of rules in the chain
766 * @list: used internally
767 * @table: table that this chain belongs to
768 * @handle: chain handle
769 * @use: number of jump references to this chain
770 * @level: length of longest path to this chain
771 * @flags: bitmask of enum nft_chain_flags
772 * @name: name of the chain
775 struct list_head rules;
776 struct list_head list;
777 struct nft_table *table;
783 char name[NFT_CHAIN_MAXNAMELEN];
786 enum nft_chain_type {
787 NFT_CHAIN_T_DEFAULT = 0,
794 * struct nf_chain_type - nf_tables chain type info
796 * @name: name of the type
797 * @type: numeric identifier
798 * @family: address family
799 * @owner: module owner
800 * @hook_mask: mask of valid hooks
801 * @hooks: hookfn overrides
803 struct nf_chain_type {
805 enum nft_chain_type type;
807 struct module *owner;
808 unsigned int hook_mask;
809 nf_hookfn *hooks[NF_MAX_HOOKS];
812 int nft_chain_validate_dependency(const struct nft_chain *chain,
813 enum nft_chain_type type);
814 int nft_chain_validate_hooks(const struct nft_chain *chain,
815 unsigned int hook_flags);
820 struct u64_stats_sync syncp;
823 #define NFT_HOOK_OPS_MAX 2
826 * struct nft_base_chain - nf_tables base chain
828 * @ops: netfilter hook ops
830 * @policy: default policy
831 * @stats: per-cpu chain stats
833 * @dev_name: device name that this base chain is attached to (if any)
835 struct nft_base_chain {
836 struct nf_hook_ops ops[NFT_HOOK_OPS_MAX];
837 const struct nf_chain_type *type;
840 struct nft_stats __percpu *stats;
841 struct nft_chain chain;
842 char dev_name[IFNAMSIZ];
845 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
847 return container_of(chain, struct nft_base_chain, chain);
850 int __nft_release_basechain(struct nft_ctx *ctx);
852 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
855 * struct nft_table - nf_tables table
857 * @list: used internally
858 * @chains: chains in the table
859 * @sets: sets in the table
860 * @hgenerator: handle generator state
861 * @use: number of chain references to this table
862 * @flags: table flag (see enum nft_table_flags)
863 * @genmask: generation mask
864 * @name: name of the table
867 struct list_head list;
868 struct list_head chains;
869 struct list_head sets;
874 char name[NFT_TABLE_MAXNAMELEN];
878 NFT_AF_NEEDS_DEV = (1 << 0),
882 * struct nft_af_info - nf_tables address family info
884 * @list: used internally
885 * @family: address family
886 * @nhooks: number of hooks in this family
887 * @owner: module owner
888 * @tables: used internally
889 * @flags: family flags
890 * @nops: number of hook ops in this family
891 * @hook_ops_init: initialization function for chain hook ops
892 * @hooks: hookfn overrides for packet validation
895 struct list_head list;
898 struct module *owner;
899 struct list_head tables;
902 void (*hook_ops_init)(struct nf_hook_ops *,
904 nf_hookfn *hooks[NF_MAX_HOOKS];
907 int nft_register_afinfo(struct net *, struct nft_af_info *);
908 void nft_unregister_afinfo(struct net *, struct nft_af_info *);
910 int nft_register_chain_type(const struct nf_chain_type *);
911 void nft_unregister_chain_type(const struct nf_chain_type *);
913 int nft_register_expr(struct nft_expr_type *);
914 void nft_unregister_expr(struct nft_expr_type *);
916 int nft_verdict_dump(struct sk_buff *skb, int type,
917 const struct nft_verdict *v);
920 * struct nft_traceinfo - nft tracing information and state
922 * @pkt: pktinfo currently processed
923 * @basechain: base chain currently processed
924 * @chain: chain currently processed
925 * @rule: rule that was evaluated
926 * @verdict: verdict given by rule
927 * @type: event type (enum nft_trace_types)
928 * @packet_dumped: packet headers sent in a previous traceinfo message
929 * @trace: other struct members are initialised
931 struct nft_traceinfo {
932 const struct nft_pktinfo *pkt;
933 const struct nft_base_chain *basechain;
934 const struct nft_chain *chain;
935 const struct nft_rule *rule;
936 const struct nft_verdict *verdict;
937 enum nft_trace_types type;
942 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
943 const struct nft_verdict *verdict,
944 const struct nft_chain *basechain);
946 void nft_trace_notify(struct nft_traceinfo *info);
948 #define nft_dereference(p) \
949 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
951 #define MODULE_ALIAS_NFT_FAMILY(family) \
952 MODULE_ALIAS("nft-afinfo-" __stringify(family))
954 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
955 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
957 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
958 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
960 #define MODULE_ALIAS_NFT_EXPR(name) \
961 MODULE_ALIAS("nft-expr-" name)
963 #define MODULE_ALIAS_NFT_SET() \
964 MODULE_ALIAS("nft-set")
967 * The gencursor defines two generations, the currently active and the
968 * next one. Objects contain a bitmask of 2 bits specifying the generations
969 * they're active in. A set bit means they're inactive in the generation
970 * represented by that bit.
972 * New objects start out as inactive in the current and active in the
973 * next generation. When committing the ruleset the bitmask is cleared,
974 * meaning they're active in all generations. When removing an object,
975 * it is set inactive in the next generation. After committing the ruleset,
976 * the objects are removed.
978 static inline unsigned int nft_gencursor_next(const struct net *net)
980 return net->nft.gencursor + 1 == 1 ? 1 : 0;
983 static inline u8 nft_genmask_next(const struct net *net)
985 return 1 << nft_gencursor_next(net);
988 static inline u8 nft_genmask_cur(const struct net *net)
990 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
991 return 1 << ACCESS_ONCE(net->nft.gencursor);
994 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
997 * Generic transaction helpers
1000 /* Check if this object is currently active. */
1001 #define nft_is_active(__net, __obj) \
1002 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1004 /* Check if this object is active in the next generation. */
1005 #define nft_is_active_next(__net, __obj) \
1006 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1008 /* This object becomes active in the next generation. */
1009 #define nft_activate_next(__net, __obj) \
1010 (__obj)->genmask = nft_genmask_cur(__net)
1012 /* This object becomes inactive in the next generation. */
1013 #define nft_deactivate_next(__net, __obj) \
1014 (__obj)->genmask = nft_genmask_next(__net)
1016 /* After committing the ruleset, clear the stale generation bit. */
1017 #define nft_clear(__net, __obj) \
1018 (__obj)->genmask &= ~nft_genmask_next(__net)
1019 #define nft_active_genmask(__obj, __genmask) \
1020 !((__obj)->genmask & __genmask)
1023 * Set element transaction helpers
1026 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1029 return !(ext->genmask & genmask);
1032 static inline void nft_set_elem_change_active(const struct net *net,
1033 const struct nft_set *set,
1034 struct nft_set_ext *ext)
1036 ext->genmask ^= nft_genmask_next(net);
1040 * We use a free bit in the genmask field to indicate the element
1041 * is busy, meaning it is currently being processed either by
1042 * the netlink API or GC.
1044 * Even though the genmask is only a single byte wide, this works
1045 * because the extension structure if fully constant once initialized,
1046 * so there are no non-atomic write accesses unless it is already
1049 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
1051 #if defined(__LITTLE_ENDIAN_BITFIELD)
1052 #define NFT_SET_ELEM_BUSY_BIT 2
1053 #elif defined(__BIG_ENDIAN_BITFIELD)
1054 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1059 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
1061 unsigned long *word = (unsigned long *)ext;
1063 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1064 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
1067 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
1069 unsigned long *word = (unsigned long *)ext;
1071 clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
1075 * struct nft_trans - nf_tables object update in transaction
1077 * @list: used internally
1078 * @msg_type: message type
1079 * @ctx: transaction context
1080 * @data: internal information related to the transaction
1083 struct list_head list;
1089 struct nft_trans_rule {
1090 struct nft_rule *rule;
1093 #define nft_trans_rule(trans) \
1094 (((struct nft_trans_rule *)trans->data)->rule)
1096 struct nft_trans_set {
1097 struct nft_set *set;
1101 #define nft_trans_set(trans) \
1102 (((struct nft_trans_set *)trans->data)->set)
1103 #define nft_trans_set_id(trans) \
1104 (((struct nft_trans_set *)trans->data)->set_id)
1106 struct nft_trans_chain {
1108 char name[NFT_CHAIN_MAXNAMELEN];
1109 struct nft_stats __percpu *stats;
1113 #define nft_trans_chain_update(trans) \
1114 (((struct nft_trans_chain *)trans->data)->update)
1115 #define nft_trans_chain_name(trans) \
1116 (((struct nft_trans_chain *)trans->data)->name)
1117 #define nft_trans_chain_stats(trans) \
1118 (((struct nft_trans_chain *)trans->data)->stats)
1119 #define nft_trans_chain_policy(trans) \
1120 (((struct nft_trans_chain *)trans->data)->policy)
1122 struct nft_trans_table {
1127 #define nft_trans_table_update(trans) \
1128 (((struct nft_trans_table *)trans->data)->update)
1129 #define nft_trans_table_enable(trans) \
1130 (((struct nft_trans_table *)trans->data)->enable)
1132 struct nft_trans_elem {
1133 struct nft_set *set;
1134 struct nft_set_elem elem;
1137 #define nft_trans_elem_set(trans) \
1138 (((struct nft_trans_elem *)trans->data)->set)
1139 #define nft_trans_elem(trans) \
1140 (((struct nft_trans_elem *)trans->data)->elem)
1142 #endif /* _NET_NF_TABLES_H */