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Linux/include/net/netfilter/nf_tables.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _NET_NF_TABLES_H
  3 #define _NET_NF_TABLES_H
  4 
  5 #include <linux/module.h>
  6 #include <linux/list.h>
  7 #include <linux/netfilter.h>
  8 #include <linux/netfilter/nfnetlink.h>
  9 #include <linux/netfilter/x_tables.h>
 10 #include <linux/netfilter/nf_tables.h>
 11 #include <linux/u64_stats_sync.h>
 12 #include <net/netlink.h>
 13 
 14 #define NFT_JUMP_STACK_SIZE     16
 15 
 16 struct nft_pktinfo {
 17         struct sk_buff                  *skb;
 18         bool                            tprot_set;
 19         u8                              tprot;
 20         /* for x_tables compatibility */
 21         struct xt_action_param          xt;
 22 };
 23 
 24 static inline struct net *nft_net(const struct nft_pktinfo *pkt)
 25 {
 26         return pkt->xt.state->net;
 27 }
 28 
 29 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt)
 30 {
 31         return pkt->xt.state->hook;
 32 }
 33 
 34 static inline u8 nft_pf(const struct nft_pktinfo *pkt)
 35 {
 36         return pkt->xt.state->pf;
 37 }
 38 
 39 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt)
 40 {
 41         return pkt->xt.state->in;
 42 }
 43 
 44 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt)
 45 {
 46         return pkt->xt.state->out;
 47 }
 48 
 49 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
 50                                    struct sk_buff *skb,
 51                                    const struct nf_hook_state *state)
 52 {
 53         pkt->skb = skb;
 54         pkt->xt.state = state;
 55 }
 56 
 57 static inline void nft_set_pktinfo_proto_unspec(struct nft_pktinfo *pkt,
 58                                                 struct sk_buff *skb)
 59 {
 60         pkt->tprot_set = false;
 61         pkt->tprot = 0;
 62         pkt->xt.thoff = 0;
 63         pkt->xt.fragoff = 0;
 64 }
 65 
 66 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt,
 67                                           struct sk_buff *skb,
 68                                           const struct nf_hook_state *state)
 69 {
 70         nft_set_pktinfo(pkt, skb, state);
 71         nft_set_pktinfo_proto_unspec(pkt, skb);
 72 }
 73 
 74 /**
 75  *      struct nft_verdict - nf_tables verdict
 76  *
 77  *      @code: nf_tables/netfilter verdict code
 78  *      @chain: destination chain for NFT_JUMP/NFT_GOTO
 79  */
 80 struct nft_verdict {
 81         u32                             code;
 82         struct nft_chain                *chain;
 83 };
 84 
 85 struct nft_data {
 86         union {
 87                 u32                     data[4];
 88                 struct nft_verdict      verdict;
 89         };
 90 } __attribute__((aligned(__alignof__(u64))));
 91 
 92 /**
 93  *      struct nft_regs - nf_tables register set
 94  *
 95  *      @data: data registers
 96  *      @verdict: verdict register
 97  *
 98  *      The first four data registers alias to the verdict register.
 99  */
100 struct nft_regs {
101         union {
102                 u32                     data[20];
103                 struct nft_verdict      verdict;
104         };
105 };
106 
107 /* Store/load an u16 or u8 integer to/from the u32 data register.
108  *
109  * Note, when using concatenations, register allocation happens at 32-bit
110  * level. So for store instruction, pad the rest part with zero to avoid
111  * garbage values.
112  */
113 
114 static inline void nft_reg_store16(u32 *dreg, u16 val)
115 {
116         *dreg = 0;
117         *(u16 *)dreg = val;
118 }
119 
120 static inline void nft_reg_store8(u32 *dreg, u8 val)
121 {
122         *dreg = 0;
123         *(u8 *)dreg = val;
124 }
125 
126 static inline u16 nft_reg_load16(u32 *sreg)
127 {
128         return *(u16 *)sreg;
129 }
130 
131 static inline u8 nft_reg_load8(u32 *sreg)
132 {
133         return *(u8 *)sreg;
134 }
135 
136 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
137                                  unsigned int len)
138 {
139         memcpy(dst, src, len);
140 }
141 
142 static inline void nft_data_debug(const struct nft_data *data)
143 {
144         pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
145                  data->data[0], data->data[1],
146                  data->data[2], data->data[3]);
147 }
148 
149 /**
150  *      struct nft_ctx - nf_tables rule/set context
151  *
152  *      @net: net namespace
153  *      @afi: address family info
154  *      @table: the table the chain is contained in
155  *      @chain: the chain the rule is contained in
156  *      @nla: netlink attributes
157  *      @portid: netlink portID of the original message
158  *      @seq: netlink sequence number
159  *      @report: notify via unicast netlink message
160  */
161 struct nft_ctx {
162         struct net                      *net;
163         struct nft_af_info              *afi;
164         struct nft_table                *table;
165         struct nft_chain                *chain;
166         const struct nlattr * const     *nla;
167         u32                             portid;
168         u32                             seq;
169         bool                            report;
170 };
171 
172 struct nft_data_desc {
173         enum nft_data_types             type;
174         unsigned int                    len;
175 };
176 
177 int nft_data_init(const struct nft_ctx *ctx,
178                   struct nft_data *data, unsigned int size,
179                   struct nft_data_desc *desc, const struct nlattr *nla);
180 void nft_data_release(const struct nft_data *data, enum nft_data_types type);
181 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
182                   enum nft_data_types type, unsigned int len);
183 
184 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
185 {
186         return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
187 }
188 
189 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
190 {
191         return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
192 }
193 
194 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
195 unsigned int nft_parse_register(const struct nlattr *attr);
196 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
197 
198 int nft_validate_register_load(enum nft_registers reg, unsigned int len);
199 int nft_validate_register_store(const struct nft_ctx *ctx,
200                                 enum nft_registers reg,
201                                 const struct nft_data *data,
202                                 enum nft_data_types type, unsigned int len);
203 
204 /**
205  *      struct nft_userdata - user defined data associated with an object
206  *
207  *      @len: length of the data
208  *      @data: content
209  *
210  *      The presence of user data is indicated in an object specific fashion,
211  *      so a length of zero can't occur and the value "len" indicates data
212  *      of length len + 1.
213  */
214 struct nft_userdata {
215         u8                      len;
216         unsigned char           data[0];
217 };
218 
219 /**
220  *      struct nft_set_elem - generic representation of set elements
221  *
222  *      @key: element key
223  *      @priv: element private data and extensions
224  */
225 struct nft_set_elem {
226         union {
227                 u32             buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
228                 struct nft_data val;
229         } key;
230         void                    *priv;
231 };
232 
233 struct nft_set;
234 struct nft_set_iter {
235         u8              genmask;
236         unsigned int    count;
237         unsigned int    skip;
238         int             err;
239         int             (*fn)(const struct nft_ctx *ctx,
240                               struct nft_set *set,
241                               const struct nft_set_iter *iter,
242                               struct nft_set_elem *elem);
243 };
244 
245 /**
246  *      struct nft_set_desc - description of set elements
247  *
248  *      @klen: key length
249  *      @dlen: data length
250  *      @size: number of set elements
251  */
252 struct nft_set_desc {
253         unsigned int            klen;
254         unsigned int            dlen;
255         unsigned int            size;
256 };
257 
258 /**
259  *      enum nft_set_class - performance class
260  *
261  *      @NFT_LOOKUP_O_1: constant, O(1)
262  *      @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
263  *      @NFT_LOOKUP_O_N: linear, O(N)
264  */
265 enum nft_set_class {
266         NFT_SET_CLASS_O_1,
267         NFT_SET_CLASS_O_LOG_N,
268         NFT_SET_CLASS_O_N,
269 };
270 
271 /**
272  *      struct nft_set_estimate - estimation of memory and performance
273  *                                characteristics
274  *
275  *      @size: required memory
276  *      @lookup: lookup performance class
277  *      @space: memory class
278  */
279 struct nft_set_estimate {
280         unsigned int            size;
281         enum nft_set_class      lookup;
282         enum nft_set_class      space;
283 };
284 
285 /**
286  *      struct nft_set_type - nf_tables set type
287  *
288  *      @select_ops: function to select nft_set_ops
289  *      @ops: default ops, used when no select_ops functions is present
290  *      @list: used internally
291  *      @owner: module reference
292  */
293 struct nft_set_type {
294         const struct nft_set_ops        *(*select_ops)(const struct nft_ctx *,
295                                                        const struct nft_set_desc *desc,
296                                                        u32 flags);
297         const struct nft_set_ops        *ops;
298         struct list_head                list;
299         struct module                   *owner;
300 };
301 
302 struct nft_set_ext;
303 struct nft_expr;
304 
305 /**
306  *      struct nft_set_ops - nf_tables set operations
307  *
308  *      @lookup: look up an element within the set
309  *      @insert: insert new element into set
310  *      @activate: activate new element in the next generation
311  *      @deactivate: lookup for element and deactivate it in the next generation
312  *      @flush: deactivate element in the next generation
313  *      @remove: remove element from set
314  *      @walk: iterate over all set elemeennts
315  *      @get: get set elements
316  *      @privsize: function to return size of set private data
317  *      @init: initialize private data of new set instance
318  *      @destroy: destroy private data of set instance
319  *      @elemsize: element private size
320  *      @features: features supported by the implementation
321  */
322 struct nft_set_ops {
323         bool                            (*lookup)(const struct net *net,
324                                                   const struct nft_set *set,
325                                                   const u32 *key,
326                                                   const struct nft_set_ext **ext);
327         bool                            (*update)(struct nft_set *set,
328                                                   const u32 *key,
329                                                   void *(*new)(struct nft_set *,
330                                                                const struct nft_expr *,
331                                                                struct nft_regs *),
332                                                   const struct nft_expr *expr,
333                                                   struct nft_regs *regs,
334                                                   const struct nft_set_ext **ext);
335 
336         int                             (*insert)(const struct net *net,
337                                                   const struct nft_set *set,
338                                                   const struct nft_set_elem *elem,
339                                                   struct nft_set_ext **ext);
340         void                            (*activate)(const struct net *net,
341                                                     const struct nft_set *set,
342                                                     const struct nft_set_elem *elem);
343         void *                          (*deactivate)(const struct net *net,
344                                                       const struct nft_set *set,
345                                                       const struct nft_set_elem *elem);
346         bool                            (*flush)(const struct net *net,
347                                                  const struct nft_set *set,
348                                                  void *priv);
349         void                            (*remove)(const struct net *net,
350                                                   const struct nft_set *set,
351                                                   const struct nft_set_elem *elem);
352         void                            (*walk)(const struct nft_ctx *ctx,
353                                                 struct nft_set *set,
354                                                 struct nft_set_iter *iter);
355         void *                          (*get)(const struct net *net,
356                                                const struct nft_set *set,
357                                                const struct nft_set_elem *elem,
358                                                unsigned int flags);
359 
360         unsigned int                    (*privsize)(const struct nlattr * const nla[],
361                                                     const struct nft_set_desc *desc);
362         bool                            (*estimate)(const struct nft_set_desc *desc,
363                                                     u32 features,
364                                                     struct nft_set_estimate *est);
365         int                             (*init)(const struct nft_set *set,
366                                                 const struct nft_set_desc *desc,
367                                                 const struct nlattr * const nla[]);
368         void                            (*destroy)(const struct nft_set *set);
369 
370         unsigned int                    elemsize;
371         u32                             features;
372         const struct nft_set_type       *type;
373 };
374 
375 int nft_register_set(struct nft_set_type *type);
376 void nft_unregister_set(struct nft_set_type *type);
377 
378 /**
379  *      struct nft_set - nf_tables set instance
380  *
381  *      @list: table set list node
382  *      @bindings: list of set bindings
383  *      @name: name of the set
384  *      @ktype: key type (numeric type defined by userspace, not used in the kernel)
385  *      @dtype: data type (verdict or numeric type defined by userspace)
386  *      @objtype: object type (see NFT_OBJECT_* definitions)
387  *      @size: maximum set size
388  *      @nelems: number of elements
389  *      @ndeact: number of deactivated elements queued for removal
390  *      @timeout: default timeout value in jiffies
391  *      @gc_int: garbage collection interval in msecs
392  *      @policy: set parameterization (see enum nft_set_policies)
393  *      @udlen: user data length
394  *      @udata: user data
395  *      @ops: set ops
396  *      @flags: set flags
397  *      @genmask: generation mask
398  *      @klen: key length
399  *      @dlen: data length
400  *      @data: private set data
401  */
402 struct nft_set {
403         struct list_head                list;
404         struct list_head                bindings;
405         char                            *name;
406         u32                             ktype;
407         u32                             dtype;
408         u32                             objtype;
409         u32                             size;
410         atomic_t                        nelems;
411         u32                             ndeact;
412         u64                             timeout;
413         u32                             gc_int;
414         u16                             policy;
415         u16                             udlen;
416         unsigned char                   *udata;
417         /* runtime data below here */
418         const struct nft_set_ops        *ops ____cacheline_aligned;
419         u16                             flags:14,
420                                         genmask:2;
421         u8                              klen;
422         u8                              dlen;
423         unsigned char                   data[]
424                 __attribute__((aligned(__alignof__(u64))));
425 };
426 
427 static inline void *nft_set_priv(const struct nft_set *set)
428 {
429         return (void *)set->data;
430 }
431 
432 static inline struct nft_set *nft_set_container_of(const void *priv)
433 {
434         return (void *)priv - offsetof(struct nft_set, data);
435 }
436 
437 struct nft_set *nft_set_lookup(const struct net *net,
438                                const struct nft_table *table,
439                                const struct nlattr *nla_set_name,
440                                const struct nlattr *nla_set_id,
441                                u8 genmask);
442 
443 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
444 {
445         return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
446 }
447 
448 /**
449  *      struct nft_set_binding - nf_tables set binding
450  *
451  *      @list: set bindings list node
452  *      @chain: chain containing the rule bound to the set
453  *      @flags: set action flags
454  *
455  *      A set binding contains all information necessary for validation
456  *      of new elements added to a bound set.
457  */
458 struct nft_set_binding {
459         struct list_head                list;
460         const struct nft_chain          *chain;
461         u32                             flags;
462 };
463 
464 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
465                        struct nft_set_binding *binding);
466 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
467                           struct nft_set_binding *binding);
468 
469 /**
470  *      enum nft_set_extensions - set extension type IDs
471  *
472  *      @NFT_SET_EXT_KEY: element key
473  *      @NFT_SET_EXT_DATA: mapping data
474  *      @NFT_SET_EXT_FLAGS: element flags
475  *      @NFT_SET_EXT_TIMEOUT: element timeout
476  *      @NFT_SET_EXT_EXPIRATION: element expiration time
477  *      @NFT_SET_EXT_USERDATA: user data associated with the element
478  *      @NFT_SET_EXT_EXPR: expression assiociated with the element
479  *      @NFT_SET_EXT_OBJREF: stateful object reference associated with element
480  *      @NFT_SET_EXT_NUM: number of extension types
481  */
482 enum nft_set_extensions {
483         NFT_SET_EXT_KEY,
484         NFT_SET_EXT_DATA,
485         NFT_SET_EXT_FLAGS,
486         NFT_SET_EXT_TIMEOUT,
487         NFT_SET_EXT_EXPIRATION,
488         NFT_SET_EXT_USERDATA,
489         NFT_SET_EXT_EXPR,
490         NFT_SET_EXT_OBJREF,
491         NFT_SET_EXT_NUM
492 };
493 
494 /**
495  *      struct nft_set_ext_type - set extension type
496  *
497  *      @len: fixed part length of the extension
498  *      @align: alignment requirements of the extension
499  */
500 struct nft_set_ext_type {
501         u8      len;
502         u8      align;
503 };
504 
505 extern const struct nft_set_ext_type nft_set_ext_types[];
506 
507 /**
508  *      struct nft_set_ext_tmpl - set extension template
509  *
510  *      @len: length of extension area
511  *      @offset: offsets of individual extension types
512  */
513 struct nft_set_ext_tmpl {
514         u16     len;
515         u8      offset[NFT_SET_EXT_NUM];
516 };
517 
518 /**
519  *      struct nft_set_ext - set extensions
520  *
521  *      @genmask: generation mask
522  *      @offset: offsets of individual extension types
523  *      @data: beginning of extension data
524  */
525 struct nft_set_ext {
526         u8      genmask;
527         u8      offset[NFT_SET_EXT_NUM];
528         char    data[0];
529 };
530 
531 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
532 {
533         memset(tmpl, 0, sizeof(*tmpl));
534         tmpl->len = sizeof(struct nft_set_ext);
535 }
536 
537 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
538                                           unsigned int len)
539 {
540         tmpl->len        = ALIGN(tmpl->len, nft_set_ext_types[id].align);
541         BUG_ON(tmpl->len > U8_MAX);
542         tmpl->offset[id] = tmpl->len;
543         tmpl->len       += nft_set_ext_types[id].len + len;
544 }
545 
546 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
547 {
548         nft_set_ext_add_length(tmpl, id, 0);
549 }
550 
551 static inline void nft_set_ext_init(struct nft_set_ext *ext,
552                                     const struct nft_set_ext_tmpl *tmpl)
553 {
554         memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
555 }
556 
557 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
558 {
559         return !!ext->offset[id];
560 }
561 
562 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
563 {
564         return ext && __nft_set_ext_exists(ext, id);
565 }
566 
567 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
568 {
569         return (void *)ext + ext->offset[id];
570 }
571 
572 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
573 {
574         return nft_set_ext(ext, NFT_SET_EXT_KEY);
575 }
576 
577 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
578 {
579         return nft_set_ext(ext, NFT_SET_EXT_DATA);
580 }
581 
582 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
583 {
584         return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
585 }
586 
587 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
588 {
589         return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
590 }
591 
592 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext)
593 {
594         return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
595 }
596 
597 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
598 {
599         return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
600 }
601 
602 static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
603 {
604         return nft_set_ext(ext, NFT_SET_EXT_EXPR);
605 }
606 
607 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
608 {
609         return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
610                time_is_before_eq_jiffies(*nft_set_ext_expiration(ext));
611 }
612 
613 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
614                                                    void *elem)
615 {
616         return elem + set->ops->elemsize;
617 }
618 
619 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
620 {
621         return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
622 }
623 
624 void *nft_set_elem_init(const struct nft_set *set,
625                         const struct nft_set_ext_tmpl *tmpl,
626                         const u32 *key, const u32 *data,
627                         u64 timeout, gfp_t gfp);
628 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
629                           bool destroy_expr);
630 
631 /**
632  *      struct nft_set_gc_batch_head - nf_tables set garbage collection batch
633  *
634  *      @rcu: rcu head
635  *      @set: set the elements belong to
636  *      @cnt: count of elements
637  */
638 struct nft_set_gc_batch_head {
639         struct rcu_head                 rcu;
640         const struct nft_set            *set;
641         unsigned int                    cnt;
642 };
643 
644 #define NFT_SET_GC_BATCH_SIZE   ((PAGE_SIZE -                             \
645                                   sizeof(struct nft_set_gc_batch_head)) / \
646                                  sizeof(void *))
647 
648 /**
649  *      struct nft_set_gc_batch - nf_tables set garbage collection batch
650  *
651  *      @head: GC batch head
652  *      @elems: garbage collection elements
653  */
654 struct nft_set_gc_batch {
655         struct nft_set_gc_batch_head    head;
656         void                            *elems[NFT_SET_GC_BATCH_SIZE];
657 };
658 
659 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
660                                                 gfp_t gfp);
661 void nft_set_gc_batch_release(struct rcu_head *rcu);
662 
663 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
664 {
665         if (gcb != NULL)
666                 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
667 }
668 
669 static inline struct nft_set_gc_batch *
670 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
671                        gfp_t gfp)
672 {
673         if (gcb != NULL) {
674                 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
675                         return gcb;
676                 nft_set_gc_batch_complete(gcb);
677         }
678         return nft_set_gc_batch_alloc(set, gfp);
679 }
680 
681 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
682                                         void *elem)
683 {
684         gcb->elems[gcb->head.cnt++] = elem;
685 }
686 
687 /**
688  *      struct nft_expr_type - nf_tables expression type
689  *
690  *      @select_ops: function to select nft_expr_ops
691  *      @ops: default ops, used when no select_ops functions is present
692  *      @list: used internally
693  *      @name: Identifier
694  *      @owner: module reference
695  *      @policy: netlink attribute policy
696  *      @maxattr: highest netlink attribute number
697  *      @family: address family for AF-specific types
698  *      @flags: expression type flags
699  */
700 struct nft_expr_type {
701         const struct nft_expr_ops       *(*select_ops)(const struct nft_ctx *,
702                                                        const struct nlattr * const tb[]);
703         const struct nft_expr_ops       *ops;
704         struct list_head                list;
705         const char                      *name;
706         struct module                   *owner;
707         const struct nla_policy         *policy;
708         unsigned int                    maxattr;
709         u8                              family;
710         u8                              flags;
711 };
712 
713 #define NFT_EXPR_STATEFUL               0x1
714 
715 /**
716  *      struct nft_expr_ops - nf_tables expression operations
717  *
718  *      @eval: Expression evaluation function
719  *      @size: full expression size, including private data size
720  *      @init: initialization function
721  *      @destroy: destruction function
722  *      @dump: function to dump parameters
723  *      @type: expression type
724  *      @validate: validate expression, called during loop detection
725  *      @data: extra data to attach to this expression operation
726  */
727 struct nft_expr;
728 struct nft_expr_ops {
729         void                            (*eval)(const struct nft_expr *expr,
730                                                 struct nft_regs *regs,
731                                                 const struct nft_pktinfo *pkt);
732         int                             (*clone)(struct nft_expr *dst,
733                                                  const struct nft_expr *src);
734         unsigned int                    size;
735 
736         int                             (*init)(const struct nft_ctx *ctx,
737                                                 const struct nft_expr *expr,
738                                                 const struct nlattr * const tb[]);
739         void                            (*destroy)(const struct nft_ctx *ctx,
740                                                    const struct nft_expr *expr);
741         int                             (*dump)(struct sk_buff *skb,
742                                                 const struct nft_expr *expr);
743         int                             (*validate)(const struct nft_ctx *ctx,
744                                                     const struct nft_expr *expr,
745                                                     const struct nft_data **data);
746         const struct nft_expr_type      *type;
747         void                            *data;
748 };
749 
750 #define NFT_EXPR_MAXATTR                16
751 #define NFT_EXPR_SIZE(size)             (sizeof(struct nft_expr) + \
752                                          ALIGN(size, __alignof__(struct nft_expr)))
753 
754 /**
755  *      struct nft_expr - nf_tables expression
756  *
757  *      @ops: expression ops
758  *      @data: expression private data
759  */
760 struct nft_expr {
761         const struct nft_expr_ops       *ops;
762         unsigned char                   data[];
763 };
764 
765 static inline void *nft_expr_priv(const struct nft_expr *expr)
766 {
767         return (void *)expr->data;
768 }
769 
770 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
771                                const struct nlattr *nla);
772 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
773 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
774                   const struct nft_expr *expr);
775 
776 static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
777 {
778         int err;
779 
780         if (src->ops->clone) {
781                 dst->ops = src->ops;
782                 err = src->ops->clone(dst, src);
783                 if (err < 0)
784                         return err;
785         } else {
786                 memcpy(dst, src, src->ops->size);
787         }
788 
789         __module_get(src->ops->type->owner);
790         return 0;
791 }
792 
793 /**
794  *      struct nft_rule - nf_tables rule
795  *
796  *      @list: used internally
797  *      @handle: rule handle
798  *      @genmask: generation mask
799  *      @dlen: length of expression data
800  *      @udata: user data is appended to the rule
801  *      @data: expression data
802  */
803 struct nft_rule {
804         struct list_head                list;
805         u64                             handle:42,
806                                         genmask:2,
807                                         dlen:12,
808                                         udata:1;
809         unsigned char                   data[]
810                 __attribute__((aligned(__alignof__(struct nft_expr))));
811 };
812 
813 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
814 {
815         return (struct nft_expr *)&rule->data[0];
816 }
817 
818 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
819 {
820         return ((void *)expr) + expr->ops->size;
821 }
822 
823 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
824 {
825         return (struct nft_expr *)&rule->data[rule->dlen];
826 }
827 
828 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
829 {
830         return (void *)&rule->data[rule->dlen];
831 }
832 
833 /*
834  * The last pointer isn't really necessary, but the compiler isn't able to
835  * determine that the result of nft_expr_last() is always the same since it
836  * can't assume that the dlen value wasn't changed within calls in the loop.
837  */
838 #define nft_rule_for_each_expr(expr, last, rule) \
839         for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
840              (expr) != (last); \
841              (expr) = nft_expr_next(expr))
842 
843 enum nft_chain_flags {
844         NFT_BASE_CHAIN                  = 0x1,
845 };
846 
847 /**
848  *      struct nft_chain - nf_tables chain
849  *
850  *      @rules: list of rules in the chain
851  *      @list: used internally
852  *      @table: table that this chain belongs to
853  *      @handle: chain handle
854  *      @use: number of jump references to this chain
855  *      @level: length of longest path to this chain
856  *      @flags: bitmask of enum nft_chain_flags
857  *      @name: name of the chain
858  */
859 struct nft_chain {
860         struct list_head                rules;
861         struct list_head                list;
862         struct nft_table                *table;
863         u64                             handle;
864         u32                             use;
865         u16                             level;
866         u8                              flags:6,
867                                         genmask:2;
868         char                            *name;
869 };
870 
871 enum nft_chain_type {
872         NFT_CHAIN_T_DEFAULT = 0,
873         NFT_CHAIN_T_ROUTE,
874         NFT_CHAIN_T_NAT,
875         NFT_CHAIN_T_MAX
876 };
877 
878 /**
879  *      struct nf_chain_type - nf_tables chain type info
880  *
881  *      @name: name of the type
882  *      @type: numeric identifier
883  *      @family: address family
884  *      @owner: module owner
885  *      @hook_mask: mask of valid hooks
886  *      @hooks: hookfn overrides
887  */
888 struct nf_chain_type {
889         const char                      *name;
890         enum nft_chain_type             type;
891         int                             family;
892         struct module                   *owner;
893         unsigned int                    hook_mask;
894         nf_hookfn                       *hooks[NF_MAX_HOOKS];
895 };
896 
897 int nft_chain_validate_dependency(const struct nft_chain *chain,
898                                   enum nft_chain_type type);
899 int nft_chain_validate_hooks(const struct nft_chain *chain,
900                              unsigned int hook_flags);
901 
902 struct nft_stats {
903         u64                     bytes;
904         u64                     pkts;
905         struct u64_stats_sync   syncp;
906 };
907 
908 #define NFT_HOOK_OPS_MAX                2
909 
910 /**
911  *      struct nft_base_chain - nf_tables base chain
912  *
913  *      @ops: netfilter hook ops
914  *      @type: chain type
915  *      @policy: default policy
916  *      @stats: per-cpu chain stats
917  *      @chain: the chain
918  *      @dev_name: device name that this base chain is attached to (if any)
919  */
920 struct nft_base_chain {
921         struct nf_hook_ops              ops[NFT_HOOK_OPS_MAX];
922         const struct nf_chain_type      *type;
923         u8                              policy;
924         u8                              flags;
925         struct nft_stats __percpu       *stats;
926         struct nft_chain                chain;
927         char                            dev_name[IFNAMSIZ];
928 };
929 
930 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
931 {
932         return container_of(chain, struct nft_base_chain, chain);
933 }
934 
935 static inline bool nft_is_base_chain(const struct nft_chain *chain)
936 {
937         return chain->flags & NFT_BASE_CHAIN;
938 }
939 
940 int __nft_release_basechain(struct nft_ctx *ctx);
941 
942 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
943 
944 /**
945  *      struct nft_table - nf_tables table
946  *
947  *      @list: used internally
948  *      @chains: chains in the table
949  *      @sets: sets in the table
950  *      @objects: stateful objects in the table
951  *      @hgenerator: handle generator state
952  *      @use: number of chain references to this table
953  *      @flags: table flag (see enum nft_table_flags)
954  *      @genmask: generation mask
955  *      @name: name of the table
956  */
957 struct nft_table {
958         struct list_head                list;
959         struct list_head                chains;
960         struct list_head                sets;
961         struct list_head                objects;
962         u64                             hgenerator;
963         u32                             use;
964         u16                             flags:14,
965                                         genmask:2;
966         char                            *name;
967 };
968 
969 enum nft_af_flags {
970         NFT_AF_NEEDS_DEV        = (1 << 0),
971 };
972 
973 /**
974  *      struct nft_af_info - nf_tables address family info
975  *
976  *      @list: used internally
977  *      @family: address family
978  *      @nhooks: number of hooks in this family
979  *      @owner: module owner
980  *      @tables: used internally
981  *      @flags: family flags
982  *      @nops: number of hook ops in this family
983  *      @hook_ops_init: initialization function for chain hook ops
984  *      @hooks: hookfn overrides for packet validation
985  */
986 struct nft_af_info {
987         struct list_head                list;
988         int                             family;
989         unsigned int                    nhooks;
990         struct module                   *owner;
991         struct list_head                tables;
992         u32                             flags;
993         unsigned int                    nops;
994         void                            (*hook_ops_init)(struct nf_hook_ops *,
995                                                          unsigned int);
996         nf_hookfn                       *hooks[NF_MAX_HOOKS];
997 };
998 
999 int nft_register_afinfo(struct net *, struct nft_af_info *);
1000 void nft_unregister_afinfo(struct net *, struct nft_af_info *);
1001 
1002 int nft_register_chain_type(const struct nf_chain_type *);
1003 void nft_unregister_chain_type(const struct nf_chain_type *);
1004 
1005 int nft_register_expr(struct nft_expr_type *);
1006 void nft_unregister_expr(struct nft_expr_type *);
1007 
1008 int nft_verdict_dump(struct sk_buff *skb, int type,
1009                      const struct nft_verdict *v);
1010 
1011 /**
1012  *      struct nft_object - nf_tables stateful object
1013  *
1014  *      @list: table stateful object list node
1015  *      @table: table this object belongs to
1016  *      @name: name of this stateful object
1017  *      @genmask: generation mask
1018  *      @use: number of references to this stateful object
1019  *      @data: object data, layout depends on type
1020  *      @ops: object operations
1021  *      @data: pointer to object data
1022  */
1023 struct nft_object {
1024         struct list_head                list;
1025         char                            *name;
1026         struct nft_table                *table;
1027         u32                             genmask:2,
1028                                         use:30;
1029         /* runtime data below here */
1030         const struct nft_object_ops     *ops ____cacheline_aligned;
1031         unsigned char                   data[]
1032                 __attribute__((aligned(__alignof__(u64))));
1033 };
1034 
1035 static inline void *nft_obj_data(const struct nft_object *obj)
1036 {
1037         return (void *)obj->data;
1038 }
1039 
1040 #define nft_expr_obj(expr)      *((struct nft_object **)nft_expr_priv(expr))
1041 
1042 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
1043                                         const struct nlattr *nla, u32 objtype,
1044                                         u8 genmask);
1045 
1046 void nft_obj_notify(struct net *net, struct nft_table *table,
1047                     struct nft_object *obj, u32 portid, u32 seq,
1048                     int event, int family, int report, gfp_t gfp);
1049 
1050 /**
1051  *      struct nft_object_type - stateful object type
1052  *
1053  *      @select_ops: function to select nft_object_ops
1054  *      @ops: default ops, used when no select_ops functions is present
1055  *      @list: list node in list of object types
1056  *      @type: stateful object numeric type
1057  *      @owner: module owner
1058  *      @maxattr: maximum netlink attribute
1059  *      @policy: netlink attribute policy
1060  */
1061 struct nft_object_type {
1062         const struct nft_object_ops     *(*select_ops)(const struct nft_ctx *,
1063                                                        const struct nlattr * const tb[]);
1064         const struct nft_object_ops     *ops;
1065         struct list_head                list;
1066         u32                             type;
1067         unsigned int                    maxattr;
1068         struct module                   *owner;
1069         const struct nla_policy         *policy;
1070 };
1071 
1072 /**
1073  *      struct nft_object_ops - stateful object operations
1074  *
1075  *      @eval: stateful object evaluation function
1076  *      @size: stateful object size
1077  *      @init: initialize object from netlink attributes
1078  *      @destroy: release existing stateful object
1079  *      @dump: netlink dump stateful object
1080  */
1081 struct nft_object_ops {
1082         void                            (*eval)(struct nft_object *obj,
1083                                                 struct nft_regs *regs,
1084                                                 const struct nft_pktinfo *pkt);
1085         unsigned int                    size;
1086         int                             (*init)(const struct nft_ctx *ctx,
1087                                                 const struct nlattr *const tb[],
1088                                                 struct nft_object *obj);
1089         void                            (*destroy)(struct nft_object *obj);
1090         int                             (*dump)(struct sk_buff *skb,
1091                                                 struct nft_object *obj,
1092                                                 bool reset);
1093         const struct nft_object_type    *type;
1094 };
1095 
1096 int nft_register_obj(struct nft_object_type *obj_type);
1097 void nft_unregister_obj(struct nft_object_type *obj_type);
1098 
1099 /**
1100  *      struct nft_traceinfo - nft tracing information and state
1101  *
1102  *      @pkt: pktinfo currently processed
1103  *      @basechain: base chain currently processed
1104  *      @chain: chain currently processed
1105  *      @rule:  rule that was evaluated
1106  *      @verdict: verdict given by rule
1107  *      @type: event type (enum nft_trace_types)
1108  *      @packet_dumped: packet headers sent in a previous traceinfo message
1109  *      @trace: other struct members are initialised
1110  */
1111 struct nft_traceinfo {
1112         const struct nft_pktinfo        *pkt;
1113         const struct nft_base_chain     *basechain;
1114         const struct nft_chain          *chain;
1115         const struct nft_rule           *rule;
1116         const struct nft_verdict        *verdict;
1117         enum nft_trace_types            type;
1118         bool                            packet_dumped;
1119         bool                            trace;
1120 };
1121 
1122 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
1123                     const struct nft_verdict *verdict,
1124                     const struct nft_chain *basechain);
1125 
1126 void nft_trace_notify(struct nft_traceinfo *info);
1127 
1128 #define nft_dereference(p)                                      \
1129         nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
1130 
1131 #define MODULE_ALIAS_NFT_FAMILY(family) \
1132         MODULE_ALIAS("nft-afinfo-" __stringify(family))
1133 
1134 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1135         MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1136 
1137 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1138         MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1139 
1140 #define MODULE_ALIAS_NFT_EXPR(name) \
1141         MODULE_ALIAS("nft-expr-" name)
1142 
1143 #define MODULE_ALIAS_NFT_SET() \
1144         MODULE_ALIAS("nft-set")
1145 
1146 #define MODULE_ALIAS_NFT_OBJ(type) \
1147         MODULE_ALIAS("nft-obj-" __stringify(type))
1148 
1149 /*
1150  * The gencursor defines two generations, the currently active and the
1151  * next one. Objects contain a bitmask of 2 bits specifying the generations
1152  * they're active in. A set bit means they're inactive in the generation
1153  * represented by that bit.
1154  *
1155  * New objects start out as inactive in the current and active in the
1156  * next generation. When committing the ruleset the bitmask is cleared,
1157  * meaning they're active in all generations. When removing an object,
1158  * it is set inactive in the next generation. After committing the ruleset,
1159  * the objects are removed.
1160  */
1161 static inline unsigned int nft_gencursor_next(const struct net *net)
1162 {
1163         return net->nft.gencursor + 1 == 1 ? 1 : 0;
1164 }
1165 
1166 static inline u8 nft_genmask_next(const struct net *net)
1167 {
1168         return 1 << nft_gencursor_next(net);
1169 }
1170 
1171 static inline u8 nft_genmask_cur(const struct net *net)
1172 {
1173         /* Use READ_ONCE() to prevent refetching the value for atomicity */
1174         return 1 << READ_ONCE(net->nft.gencursor);
1175 }
1176 
1177 #define NFT_GENMASK_ANY         ((1 << 0) | (1 << 1))
1178 
1179 /*
1180  * Generic transaction helpers
1181  */
1182 
1183 /* Check if this object is currently active. */
1184 #define nft_is_active(__net, __obj)                             \
1185         (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1186 
1187 /* Check if this object is active in the next generation. */
1188 #define nft_is_active_next(__net, __obj)                        \
1189         (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1190 
1191 /* This object becomes active in the next generation. */
1192 #define nft_activate_next(__net, __obj)                         \
1193         (__obj)->genmask = nft_genmask_cur(__net)
1194 
1195 /* This object becomes inactive in the next generation. */
1196 #define nft_deactivate_next(__net, __obj)                       \
1197         (__obj)->genmask = nft_genmask_next(__net)
1198 
1199 /* After committing the ruleset, clear the stale generation bit. */
1200 #define nft_clear(__net, __obj)                                 \
1201         (__obj)->genmask &= ~nft_genmask_next(__net)
1202 #define nft_active_genmask(__obj, __genmask)                    \
1203         !((__obj)->genmask & __genmask)
1204 
1205 /*
1206  * Set element transaction helpers
1207  */
1208 
1209 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1210                                        u8 genmask)
1211 {
1212         return !(ext->genmask & genmask);
1213 }
1214 
1215 static inline void nft_set_elem_change_active(const struct net *net,
1216                                               const struct nft_set *set,
1217                                               struct nft_set_ext *ext)
1218 {
1219         ext->genmask ^= nft_genmask_next(net);
1220 }
1221 
1222 /*
1223  * We use a free bit in the genmask field to indicate the element
1224  * is busy, meaning it is currently being processed either by
1225  * the netlink API or GC.
1226  *
1227  * Even though the genmask is only a single byte wide, this works
1228  * because the extension structure if fully constant once initialized,
1229  * so there are no non-atomic write accesses unless it is already
1230  * marked busy.
1231  */
1232 #define NFT_SET_ELEM_BUSY_MASK  (1 << 2)
1233 
1234 #if defined(__LITTLE_ENDIAN_BITFIELD)
1235 #define NFT_SET_ELEM_BUSY_BIT   2
1236 #elif defined(__BIG_ENDIAN_BITFIELD)
1237 #define NFT_SET_ELEM_BUSY_BIT   (BITS_PER_LONG - BITS_PER_BYTE + 2)
1238 #else
1239 #error
1240 #endif
1241 
1242 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
1243 {
1244         unsigned long *word = (unsigned long *)ext;
1245 
1246         BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1247         return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
1248 }
1249 
1250 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
1251 {
1252         unsigned long *word = (unsigned long *)ext;
1253 
1254         clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
1255 }
1256 
1257 /**
1258  *      struct nft_trans - nf_tables object update in transaction
1259  *
1260  *      @list: used internally
1261  *      @msg_type: message type
1262  *      @ctx: transaction context
1263  *      @data: internal information related to the transaction
1264  */
1265 struct nft_trans {
1266         struct list_head                list;
1267         int                             msg_type;
1268         struct nft_ctx                  ctx;
1269         char                            data[0];
1270 };
1271 
1272 struct nft_trans_rule {
1273         struct nft_rule                 *rule;
1274         u32                             rule_id;
1275 };
1276 
1277 #define nft_trans_rule(trans)   \
1278         (((struct nft_trans_rule *)trans->data)->rule)
1279 #define nft_trans_rule_id(trans)        \
1280         (((struct nft_trans_rule *)trans->data)->rule_id)
1281 
1282 struct nft_trans_set {
1283         struct nft_set                  *set;
1284         u32                             set_id;
1285 };
1286 
1287 #define nft_trans_set(trans)    \
1288         (((struct nft_trans_set *)trans->data)->set)
1289 #define nft_trans_set_id(trans) \
1290         (((struct nft_trans_set *)trans->data)->set_id)
1291 
1292 struct nft_trans_chain {
1293         bool                            update;
1294         char                            *name;
1295         struct nft_stats __percpu       *stats;
1296         u8                              policy;
1297 };
1298 
1299 #define nft_trans_chain_update(trans)   \
1300         (((struct nft_trans_chain *)trans->data)->update)
1301 #define nft_trans_chain_name(trans)     \
1302         (((struct nft_trans_chain *)trans->data)->name)
1303 #define nft_trans_chain_stats(trans)    \
1304         (((struct nft_trans_chain *)trans->data)->stats)
1305 #define nft_trans_chain_policy(trans)   \
1306         (((struct nft_trans_chain *)trans->data)->policy)
1307 
1308 struct nft_trans_table {
1309         bool                            update;
1310         bool                            enable;
1311 };
1312 
1313 #define nft_trans_table_update(trans)   \
1314         (((struct nft_trans_table *)trans->data)->update)
1315 #define nft_trans_table_enable(trans)   \
1316         (((struct nft_trans_table *)trans->data)->enable)
1317 
1318 struct nft_trans_elem {
1319         struct nft_set                  *set;
1320         struct nft_set_elem             elem;
1321 };
1322 
1323 #define nft_trans_elem_set(trans)       \
1324         (((struct nft_trans_elem *)trans->data)->set)
1325 #define nft_trans_elem(trans)   \
1326         (((struct nft_trans_elem *)trans->data)->elem)
1327 
1328 struct nft_trans_obj {
1329         struct nft_object               *obj;
1330 };
1331 
1332 #define nft_trans_obj(trans)    \
1333         (((struct nft_trans_obj *)trans->data)->obj)
1334 
1335 #endif /* _NET_NF_TABLES_H */
1336 

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