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 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _NET_NF_TABLES_H
 #define _NET_NF_TABLES_H
 
 #include <asm/unaligned.h>
 #include <linux/list.h>
 #include <linux/netfilter.h>
 #include <linux/netfilter/nfnetlink.h>
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/nf_tables.h>
 #include <linux/u64_stats_sync.h>
 #include <linux/rhashtable.h>
 #include <net/netfilter/nf_flow_table.h>
 #include <net/netlink.h>
 #include <net/flow_offload.h>
 #include <net/netns/generic.h>
 
 #define NFT_MAX_HOOKS   (NF_INET_INGRESS + 1)
 
 struct module;
 
 #define NFT_JUMP_STACK_SIZE 16
 
 enum {
     NFT_PKTINFO_L4PROTO = (1 << 0),
     NFT_PKTINFO_INNER   = (1 << 1),
 };
 
 struct nft_pktinfo {
     struct sk_buff          *skb;
     const struct nf_hook_state  *state;
     u8              flags;
     u8              tprot;
     u16             fragoff;
     unsigned int            thoff;
     unsigned int            inneroff;
 };
 
 static inline struct sock *nft_sk(const struct nft_pktinfo *pkt)
 {
     return pkt->state->sk;
 }
 
 static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt)
 {
     return pkt->thoff;
 }
 
 static inline struct net *nft_net(const struct nft_pktinfo *pkt)
 {
     return pkt->state->net;
 }
 
 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt)
 {
     return pkt->state->hook;
 }
 
 static inline u8 nft_pf(const struct nft_pktinfo *pkt)
 {
     return pkt->state->pf;
 }
 
 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt)
 {
     return pkt->state->in;
 }
 
 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt)
 {
     return pkt->state->out;
 }
 
 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
                    struct sk_buff *skb,
                    const struct nf_hook_state *state)
 {
     pkt->skb = skb;
     pkt->state = state;
 }
 
 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt)
 {
     pkt->flags = 0;
     pkt->tprot = 0;
     pkt->thoff = 0;
     pkt->fragoff = 0;
 }
 
 /**
  *  struct nft_verdict - nf_tables verdict
  *
  *  @code: nf_tables/netfilter verdict code
  *  @chain: destination chain for NFT_JUMP/NFT_GOTO
  */
 struct nft_verdict {
     u32             code;
     struct nft_chain        *chain;
 };
 
 struct nft_data {
     union {
         u32         data[4];
         struct nft_verdict  verdict;
     };
 } __attribute__((aligned(__alignof__(u64))));
 
 #define NFT_REG32_NUM       20
 
 /**
  *  struct nft_regs - nf_tables register set
  *
  *  @data: data registers
  *  @verdict: verdict register
  *
  *  The first four data registers alias to the verdict register.
  */
 struct nft_regs {
     union {
         u32         data[NFT_REG32_NUM];
         struct nft_verdict  verdict;
     };
 };
 
 struct nft_regs_track {
     struct {
         const struct nft_expr       *selector;
         const struct nft_expr       *bitwise;
         u8              num_reg;
     } regs[NFT_REG32_NUM];
 
     const struct nft_expr           *cur;
     const struct nft_expr           *last;
 };
 
 /* Store/load an u8, u16 or u64 integer to/from the u32 data register.
  *
  * Note, when using concatenations, register allocation happens at 32-bit
  * level. So for store instruction, pad the rest part with zero to avoid
  * garbage values.
  */
 
 static inline void nft_reg_store8(u32 *dreg, u8 val)
 {
     *dreg = 0;
     *(u8 *)dreg = val;
 }
 
 static inline u8 nft_reg_load8(const u32 *sreg)
 {
     return *(u8 *)sreg;
 }
 
 static inline void nft_reg_store16(u32 *dreg, u16 val)
 {
     *dreg = 0;
     *(u16 *)dreg = val;
 }
 
 static inline void nft_reg_store_be16(u32 *dreg, __be16 val)
 {
     nft_reg_store16(dreg, (__force __u16)val);
 }
 
 static inline u16 nft_reg_load16(const u32 *sreg)
 {
     return *(u16 *)sreg;
 }
 
 static inline __be16 nft_reg_load_be16(const u32 *sreg)
 {
     return (__force __be16)nft_reg_load16(sreg);
 }
 
 static inline __be32 nft_reg_load_be32(const u32 *sreg)
 {
     return *(__force __be32 *)sreg;
 }
 
 static inline void nft_reg_store64(u32 *dreg, u64 val)
 {
     put_unaligned(val, (u64 *)dreg);
 }
 
 static inline u64 nft_reg_load64(const u32 *sreg)
 {
     return get_unaligned((u64 *)sreg);
 }
 
 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
                  unsigned int len)
 {
     if (len % NFT_REG32_SIZE)
         dst[len / NFT_REG32_SIZE] = 0;
     memcpy(dst, src, len);
 }
 
 /**
  *  struct nft_ctx - nf_tables rule/set context
  *
  *  @net: net namespace
  *  @table: the table the chain is contained in
  *  @chain: the chain the rule is contained in
  *  @nla: netlink attributes
  *  @portid: netlink portID of the original message
  *  @seq: netlink sequence number
  *  @family: protocol family
  *  @level: depth of the chains
  *  @report: notify via unicast netlink message
  */
 struct nft_ctx {
     struct net          *net;
     struct nft_table        *table;
     struct nft_chain        *chain;
     const struct nlattr * const     *nla;
     u32             portid;
     u32             seq;
     u16             flags;
     u8              family;
     u8              level;
     bool                report;
 };
 
 enum nft_data_desc_flags {
     NFT_DATA_DESC_SETELEM   = (1 << 0),
 };
 
 struct nft_data_desc {
     enum nft_data_types     type;
     unsigned int            size;
     unsigned int            len;
     unsigned int            flags;
 };
 
 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
           struct nft_data_desc *desc, const struct nlattr *nla);
 void nft_data_hold(const struct nft_data *data, enum nft_data_types type);
 void nft_data_release(const struct nft_data *data, enum nft_data_types type);
 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
           enum nft_data_types type, unsigned int len);
 
 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
 {
     return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
 }
 
 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
 {
     return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
 }
 
 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
 
 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len);
 int nft_parse_register_store(const struct nft_ctx *ctx,
                  const struct nlattr *attr, u8 *dreg,
                  const struct nft_data *data,
                  enum nft_data_types type, unsigned int len);
 
 /**
  *  struct nft_userdata - user defined data associated with an object
  *
  *  @len: length of the data
  *  @data: content
  *
  *  The presence of user data is indicated in an object specific fashion,
  *  so a length of zero can't occur and the value "len" indicates data
  *  of length len + 1.
  */
 struct nft_userdata {
     u8          len;
     unsigned char       data[];
 };
 
 /**
  *  struct nft_set_elem - generic representation of set elements
  *
  *  @key: element key
  *  @key_end: closing element key
  *  @priv: element private data and extensions
  */
 struct nft_set_elem {
     union {
         u32     buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
         struct nft_data val;
     } key;
     union {
         u32     buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
         struct nft_data val;
     } key_end;
     union {
         u32     buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
         struct nft_data val;
     } data;
     void            *priv;
 };
 
 struct nft_set;
 struct nft_set_iter {
     u8      genmask;
     unsigned int    count;
     unsigned int    skip;
     int     err;
     int     (*fn)(const struct nft_ctx *ctx,
                   struct nft_set *set,
                   const struct nft_set_iter *iter,
                   struct nft_set_elem *elem);
 };
 
 /**
  *  struct nft_set_desc - description of set elements
  *
  *  @klen: key length
  *  @dlen: data length
  *  @size: number of set elements
  *  @field_len: length of each field in concatenation, bytes
  *  @field_count: number of concatenated fields in element
  *  @expr: set must support for expressions
  */
 struct nft_set_desc {
     unsigned int        klen;
     unsigned int        dlen;
     unsigned int        size;
     u8          field_len[NFT_REG32_COUNT];
     u8          field_count;
     bool            expr;
 };
 
 /**
  *  enum nft_set_class - performance class
  *
  *  @NFT_LOOKUP_O_1: constant, O(1)
  *  @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
  *  @NFT_LOOKUP_O_N: linear, O(N)
  */
 enum nft_set_class {
     NFT_SET_CLASS_O_1,
     NFT_SET_CLASS_O_LOG_N,
     NFT_SET_CLASS_O_N,
 };
 
 /**
  *  struct nft_set_estimate - estimation of memory and performance
  *                characteristics
  *
  *  @size: required memory
  *  @lookup: lookup performance class
  *  @space: memory class
  */
 struct nft_set_estimate {
     u64         size;
     enum nft_set_class  lookup;
     enum nft_set_class  space;
 };
 
 #define NFT_EXPR_MAXATTR        16
 #define NFT_EXPR_SIZE(size)     (sizeof(struct nft_expr) + \
                      ALIGN(size, __alignof__(struct nft_expr)))
 
 /**
  *  struct nft_expr - nf_tables expression
  *
  *  @ops: expression ops
  *  @data: expression private data
  */
 struct nft_expr {
     const struct nft_expr_ops   *ops;
     unsigned char           data[]
         __attribute__((aligned(__alignof__(u64))));
 };
 
 static inline void *nft_expr_priv(const struct nft_expr *expr)
 {
     return (void *)expr->data;
 }
 
 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src);
 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
           const struct nft_expr *expr);
 bool nft_expr_reduce_bitwise(struct nft_regs_track *track,
                  const struct nft_expr *expr);
 
 struct nft_set_ext;
 
 /**
  *  struct nft_set_ops - nf_tables set operations
  *
  *  @lookup: look up an element within the set
  *  @update: update an element if exists, add it if doesn't exist
  *  @delete: delete an element
  *  @insert: insert new element into set
  *  @activate: activate new element in the next generation
  *  @deactivate: lookup for element and deactivate it in the next generation
  *  @flush: deactivate element in the next generation
  *  @remove: remove element from set
  *  @walk: iterate over all set elements
  *  @get: get set elements
  *  @privsize: function to return size of set private data
  *  @init: initialize private data of new set instance
  *  @destroy: destroy private data of set instance
  *  @elemsize: element private size
  *
  *  Operations lookup, update and delete have simpler interfaces, are faster
  *  and currently only used in the packet path. All the rest are slower,
  *  control plane functions.
  */
 struct nft_set_ops {
     bool                (*lookup)(const struct net *net,
                           const struct nft_set *set,
                           const u32 *key,
                           const struct nft_set_ext **ext);
     bool                (*update)(struct nft_set *set,
                           const u32 *key,
                           void *(*new)(struct nft_set *,
                                    const struct nft_expr *,
                                    struct nft_regs *),
                           const struct nft_expr *expr,
                           struct nft_regs *regs,
                           const struct nft_set_ext **ext);
     bool                (*delete)(const struct nft_set *set,
                           const u32 *key);
 
     int             (*insert)(const struct net *net,
                           const struct nft_set *set,
                           const struct nft_set_elem *elem,
                           struct nft_set_ext **ext);
     void                (*activate)(const struct net *net,
                             const struct nft_set *set,
                             const struct nft_set_elem *elem);
     void *              (*deactivate)(const struct net *net,
                               const struct nft_set *set,
                               const struct nft_set_elem *elem);
     bool                (*flush)(const struct net *net,
                          const struct nft_set *set,
                          void *priv);
     void                (*remove)(const struct net *net,
                           const struct nft_set *set,
                           const struct nft_set_elem *elem);
     void                (*walk)(const struct nft_ctx *ctx,
                         struct nft_set *set,
                         struct nft_set_iter *iter);
     void *              (*get)(const struct net *net,
                            const struct nft_set *set,
                            const struct nft_set_elem *elem,
                            unsigned int flags);
 
     u64             (*privsize)(const struct nlattr * const nla[],
                             const struct nft_set_desc *desc);
     bool                (*estimate)(const struct nft_set_desc *desc,
                             u32 features,
                             struct nft_set_estimate *est);
     int             (*init)(const struct nft_set *set,
                         const struct nft_set_desc *desc,
                         const struct nlattr * const nla[]);
     void                (*destroy)(const struct nft_set *set);
     void                (*gc_init)(const struct nft_set *set);
 
     unsigned int            elemsize;
 };
 
 /**
  *      struct nft_set_type - nf_tables set type
  *
  *      @ops: set ops for this type
  *      @features: features supported by the implementation
  */
 struct nft_set_type {
     const struct nft_set_ops    ops;
     u32             features;
 };
 #define to_set_type(o) container_of(o, struct nft_set_type, ops)
 
 struct nft_set_elem_expr {
     u8              size;
     unsigned char           data[]
         __attribute__((aligned(__alignof__(struct nft_expr))));
 };
 
 #define nft_setelem_expr_at(__elem_expr, __offset)          \
     ((struct nft_expr *)&__elem_expr->data[__offset])
 
 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size)       \
     for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0;  \
          __size < (__elem_expr)->size;              \
          __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size)
 
 #define NFT_SET_EXPR_MAX    2
 
 /**
  *  struct nft_set - nf_tables set instance
  *
  *  @list: table set list node
  *  @bindings: list of set bindings
  *  @table: table this set belongs to
  *  @net: netnamespace this set belongs to
  *  @name: name of the set
  *  @handle: unique handle of the set
  *  @ktype: key type (numeric type defined by userspace, not used in the kernel)
  *  @dtype: data type (verdict or numeric type defined by userspace)
  *  @objtype: object type (see NFT_OBJECT_* definitions)
  *  @size: maximum set size
  *  @field_len: length of each field in concatenation, bytes
  *  @field_count: number of concatenated fields in element
  *  @use: number of rules references to this set
  *  @nelems: number of elements
  *  @ndeact: number of deactivated elements queued for removal
  *  @timeout: default timeout value in jiffies
  *  @gc_int: garbage collection interval in msecs
  *  @policy: set parameterization (see enum nft_set_policies)
  *  @udlen: user data length
  *  @udata: user data
  *  @expr: stateful expression
  *  @ops: set ops
  *  @flags: set flags
  *  @genmask: generation mask
  *  @klen: key length
  *  @dlen: data length
  *  @data: private set data
  */
 struct nft_set {
     struct list_head        list;
     struct list_head        bindings;
     struct nft_table        *table;
     possible_net_t          net;
     char                *name;
     u64             handle;
     u32             ktype;
     u32             dtype;
     u32             objtype;
     u32             size;
     u8              field_len[NFT_REG32_COUNT];
     u8              field_count;
     u32             use;
     atomic_t            nelems;
     u32             ndeact;
     u64             timeout;
     u32             gc_int;
     u16             policy;
     u16             udlen;
     unsigned char           *udata;
     /* runtime data below here */
     const struct nft_set_ops    *ops ____cacheline_aligned;
     u16             flags:14,
                     genmask:2;
     u8              klen;
     u8              dlen;
     u8              num_exprs;
     struct nft_expr         *exprs[NFT_SET_EXPR_MAX];
     struct list_head        catchall_list;
     unsigned char           data[]
         __attribute__((aligned(__alignof__(u64))));
 };
 
 static inline bool nft_set_is_anonymous(const struct nft_set *set)
 {
     return set->flags & NFT_SET_ANONYMOUS;
 }
 
 static inline void *nft_set_priv(const struct nft_set *set)
 {
     return (void *)set->data;
 }
 
 static inline struct nft_set *nft_set_container_of(const void *priv)
 {
     return (void *)priv - offsetof(struct nft_set, data);
 }
 
 struct nft_set *nft_set_lookup_global(const struct net *net,
                       const struct nft_table *table,
                       const struct nlattr *nla_set_name,
                       const struct nlattr *nla_set_id,
                       u8 genmask);
 
 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
                         const struct nft_set *set);
 void *nft_set_catchall_gc(const struct nft_set *set);
 
 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
 {
     return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
 }
 
 /**
  *  struct nft_set_binding - nf_tables set binding
  *
  *  @list: set bindings list node
  *  @chain: chain containing the rule bound to the set
  *  @flags: set action flags
  *
  *  A set binding contains all information necessary for validation
  *  of new elements added to a bound set.
  */
 struct nft_set_binding {
     struct list_head        list;
     const struct nft_chain      *chain;
     u32             flags;
 };
 
 enum nft_trans_phase;
 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
                   struct nft_set_binding *binding,
                   enum nft_trans_phase phase);
 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
                struct nft_set_binding *binding);
 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
 
 /**
  *  enum nft_set_extensions - set extension type IDs
  *
  *  @NFT_SET_EXT_KEY: element key
  *  @NFT_SET_EXT_KEY_END: upper bound element key, for ranges
  *  @NFT_SET_EXT_DATA: mapping data
  *  @NFT_SET_EXT_FLAGS: element flags
  *  @NFT_SET_EXT_TIMEOUT: element timeout
  *  @NFT_SET_EXT_EXPIRATION: element expiration time
  *  @NFT_SET_EXT_USERDATA: user data associated with the element
  *  @NFT_SET_EXT_EXPRESSIONS: expressions assiciated with the element
  *  @NFT_SET_EXT_OBJREF: stateful object reference associated with element
  *  @NFT_SET_EXT_NUM: number of extension types
  */
 enum nft_set_extensions {
     NFT_SET_EXT_KEY,
     NFT_SET_EXT_KEY_END,
     NFT_SET_EXT_DATA,
     NFT_SET_EXT_FLAGS,
     NFT_SET_EXT_TIMEOUT,
     NFT_SET_EXT_EXPIRATION,
     NFT_SET_EXT_USERDATA,
     NFT_SET_EXT_EXPRESSIONS,
     NFT_SET_EXT_OBJREF,
     NFT_SET_EXT_NUM
 };
 
 /**
  *  struct nft_set_ext_type - set extension type
  *
  *  @len: fixed part length of the extension
  *  @align: alignment requirements of the extension
  */
 struct nft_set_ext_type {
     u8  len;
     u8  align;
 };
 
 extern const struct nft_set_ext_type nft_set_ext_types[];
 
 /**
  *  struct nft_set_ext_tmpl - set extension template
  *
  *  @len: length of extension area
  *  @offset: offsets of individual extension types
  */
 struct nft_set_ext_tmpl {
     u16 len;
     u8  offset[NFT_SET_EXT_NUM];
     u8  ext_len[NFT_SET_EXT_NUM];
 };
 
 /**
  *  struct nft_set_ext - set extensions
  *
  *  @genmask: generation mask
  *  @offset: offsets of individual extension types
  *  @data: beginning of extension data
  */
 struct nft_set_ext {
     u8  genmask;
     u8  offset[NFT_SET_EXT_NUM];
     char    data[];
 };
 
 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
 {
     memset(tmpl, 0, sizeof(*tmpl));
     tmpl->len = sizeof(struct nft_set_ext);
 }
 
 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
                      unsigned int len)
 {
     tmpl->len    = ALIGN(tmpl->len, nft_set_ext_types[id].align);
     if (tmpl->len > U8_MAX)
         return -EINVAL;
 
     tmpl->offset[id] = tmpl->len;
     tmpl->ext_len[id] = nft_set_ext_types[id].len + len;
     tmpl->len   += tmpl->ext_len[id];
 
     return 0;
 }
 
 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
 {
     return nft_set_ext_add_length(tmpl, id, 0);
 }
 
 static inline void nft_set_ext_init(struct nft_set_ext *ext,
                     const struct nft_set_ext_tmpl *tmpl)
 {
     memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
 }
 
 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
 {
     return !!ext->offset[id];
 }
 
 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
 {
     return ext && __nft_set_ext_exists(ext, id);
 }
 
 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
 {
     return (void *)ext + ext->offset[id];
 }
 
 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_KEY);
 }
 
 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
 }
 
 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_DATA);
 }
 
 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
 }
 
 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
 }
 
 static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
 }
 
 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
 }
 
 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS);
 }
 
 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
 {
     return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
            time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext));
 }
 
 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
                            void *elem)
 {
     return elem + set->ops->elemsize;
 }
 
 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
 {
     return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
 }
 
 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
                      const struct nft_set *set,
                      const struct nlattr *attr);
 
 void *nft_set_elem_init(const struct nft_set *set,
             const struct nft_set_ext_tmpl *tmpl,
             const u32 *key, const u32 *key_end, const u32 *data,
             u64 timeout, u64 expiration, gfp_t gfp);
 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
                 struct nft_expr *expr_array[]);
 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
               bool destroy_expr);
 
 /**
  *  struct nft_set_gc_batch_head - nf_tables set garbage collection batch
  *
  *  @rcu: rcu head
  *  @set: set the elements belong to
  *  @cnt: count of elements
  */
 struct nft_set_gc_batch_head {
     struct rcu_head         rcu;
     const struct nft_set        *set;
     unsigned int            cnt;
 };
 
 #define NFT_SET_GC_BATCH_SIZE   ((PAGE_SIZE -                 \
                   sizeof(struct nft_set_gc_batch_head)) / \
                  sizeof(void *))
 
 /**
  *  struct nft_set_gc_batch - nf_tables set garbage collection batch
  *
  *  @head: GC batch head
  *  @elems: garbage collection elements
  */
 struct nft_set_gc_batch {
     struct nft_set_gc_batch_head    head;
     void                *elems[NFT_SET_GC_BATCH_SIZE];
 };
 
 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
                         gfp_t gfp);
 void nft_set_gc_batch_release(struct rcu_head *rcu);
 
 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
 {
     if (gcb != NULL)
         call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
 }
 
 static inline struct nft_set_gc_batch *
 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
                gfp_t gfp)
 {
     if (gcb != NULL) {
         if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
             return gcb;
         nft_set_gc_batch_complete(gcb);
     }
     return nft_set_gc_batch_alloc(set, gfp);
 }
 
 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
                     void *elem)
 {
     gcb->elems[gcb->head.cnt++] = elem;
 }
 
 struct nft_expr_ops;
 /**
  *  struct nft_expr_type - nf_tables expression type
  *
  *  @select_ops: function to select nft_expr_ops
  *  @release_ops: release nft_expr_ops
  *  @ops: default ops, used when no select_ops functions is present
  *  @list: used internally
  *  @name: Identifier
  *  @owner: module reference
  *  @policy: netlink attribute policy
  *  @maxattr: highest netlink attribute number
  *  @family: address family for AF-specific types
  *  @flags: expression type flags
  */
 struct nft_expr_type {
     const struct nft_expr_ops   *(*select_ops)(const struct nft_ctx *,
                                const struct nlattr * const tb[]);
     void                (*release_ops)(const struct nft_expr_ops *ops);
     const struct nft_expr_ops   *ops;
     struct list_head        list;
     const char          *name;
     struct module           *owner;
     const struct nla_policy     *policy;
     unsigned int            maxattr;
     u8              family;
     u8              flags;
 };
 
 #define NFT_EXPR_STATEFUL       0x1
 #define NFT_EXPR_GC         0x2
 
 enum nft_trans_phase {
     NFT_TRANS_PREPARE,
     NFT_TRANS_ABORT,
     NFT_TRANS_COMMIT,
     NFT_TRANS_RELEASE
 };
 
 struct nft_flow_rule;
 struct nft_offload_ctx;
 
 /**
  *  struct nft_expr_ops - nf_tables expression operations
  *
  *  @eval: Expression evaluation function
  *  @size: full expression size, including private data size
  *  @init: initialization function
  *  @activate: activate expression in the next generation
  *  @deactivate: deactivate expression in next generation
  *  @destroy: destruction function, called after synchronize_rcu
  *  @dump: function to dump parameters
  *  @type: expression type
  *  @validate: validate expression, called during loop detection
  *  @data: extra data to attach to this expression operation
  */
 struct nft_expr_ops {
     void                (*eval)(const struct nft_expr *expr,
                         struct nft_regs *regs,
                         const struct nft_pktinfo *pkt);
     int             (*clone)(struct nft_expr *dst,
                          const struct nft_expr *src);
     unsigned int            size;
 
     int             (*init)(const struct nft_ctx *ctx,
                         const struct nft_expr *expr,
                         const struct nlattr * const tb[]);
     void                (*activate)(const struct nft_ctx *ctx,
                             const struct nft_expr *expr);
     void                (*deactivate)(const struct nft_ctx *ctx,
                               const struct nft_expr *expr,
                               enum nft_trans_phase phase);
     void                (*destroy)(const struct nft_ctx *ctx,
                            const struct nft_expr *expr);
     void                (*destroy_clone)(const struct nft_ctx *ctx,
                              const struct nft_expr *expr);
     int             (*dump)(struct sk_buff *skb,
                         const struct nft_expr *expr);
     int             (*validate)(const struct nft_ctx *ctx,
                             const struct nft_expr *expr,
                             const struct nft_data **data);
     bool                (*reduce)(struct nft_regs_track *track,
                           const struct nft_expr *expr);
     bool                (*gc)(struct net *net,
                           const struct nft_expr *expr);
     int             (*offload)(struct nft_offload_ctx *ctx,
                            struct nft_flow_rule *flow,
                            const struct nft_expr *expr);
     bool                (*offload_action)(const struct nft_expr *expr);
     void                (*offload_stats)(struct nft_expr *expr,
                              const struct flow_stats *stats);
     const struct nft_expr_type  *type;
     void                *data;
 };
 
 /**
  *  struct nft_rule - nf_tables rule
  *
  *  @list: used internally
  *  @handle: rule handle
  *  @genmask: generation mask
  *  @dlen: length of expression data
  *  @udata: user data is appended to the rule
  *  @data: expression data
  */
 struct nft_rule {
     struct list_head        list;
     u64             handle:42,
                     genmask:2,
                     dlen:12,
                     udata:1;
     unsigned char           data[]
         __attribute__((aligned(__alignof__(struct nft_expr))));
 };
 
 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
 {
     return (struct nft_expr *)&rule->data[0];
 }
 
 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
 {
     return ((void *)expr) + expr->ops->size;
 }
 
 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
 {
     return (struct nft_expr *)&rule->data[rule->dlen];
 }
 
 static inline bool nft_expr_more(const struct nft_rule *rule,
                  const struct nft_expr *expr)
 {
     return expr != nft_expr_last(rule) && expr->ops;
 }
 
 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
 {
     return (void *)&rule->data[rule->dlen];
 }
 
 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule);
 
 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
                         struct nft_regs *regs,
                         const struct nft_pktinfo *pkt)
 {
     struct nft_set_elem_expr *elem_expr;
     struct nft_expr *expr;
     u32 size;
 
     if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) {
         elem_expr = nft_set_ext_expr(ext);
         nft_setelem_expr_foreach(expr, elem_expr, size) {
             expr->ops->eval(expr, regs, pkt);
             if (regs->verdict.code == NFT_BREAK)
                 return;
         }
     }
 }
 
 /*
  * The last pointer isn't really necessary, but the compiler isn't able to
  * determine that the result of nft_expr_last() is always the same since it
  * can't assume that the dlen value wasn't changed within calls in the loop.
  */
 #define nft_rule_for_each_expr(expr, last, rule) \
     for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
          (expr) != (last); \
          (expr) = nft_expr_next(expr))
 
 #define NFT_CHAIN_POLICY_UNSET      U8_MAX
 
 struct nft_rule_dp {
     u64             is_last:1,
                     dlen:12,
                     handle:42;  /* for tracing */
     unsigned char           data[]
         __attribute__((aligned(__alignof__(struct nft_expr))));
 };
 
 struct nft_rule_blob {
     unsigned long           size;
     unsigned char           data[]
         __attribute__((aligned(__alignof__(struct nft_rule_dp))));
 };
 
 /**
  *  struct nft_chain - nf_tables chain
  *
  *  @rules: list of rules in the chain
  *  @list: used internally
  *  @rhlhead: used internally
  *  @table: table that this chain belongs to
  *  @handle: chain handle
  *  @use: number of jump references to this chain
  *  @flags: bitmask of enum nft_chain_flags
  *  @name: name of the chain
  */
 struct nft_chain {
     struct nft_rule_blob        __rcu *blob_gen_0;
     struct nft_rule_blob        __rcu *blob_gen_1;
     struct list_head        rules;
     struct list_head        list;
     struct rhlist_head      rhlhead;
     struct nft_table        *table;
     u64             handle;
     u32             use;
     u8              flags:5,
                     bound:1,
                     genmask:2;
     char                *name;
     u16             udlen;
     u8              *udata;
 
     /* Only used during control plane commit phase: */
     struct nft_rule_blob        *blob_next;
 };
 
 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain);
 
 enum nft_chain_types {
     NFT_CHAIN_T_DEFAULT = 0,
     NFT_CHAIN_T_ROUTE,
     NFT_CHAIN_T_NAT,
     NFT_CHAIN_T_MAX
 };
 
 /**
  *  struct nft_chain_type - nf_tables chain type info
  *
  *  @name: name of the type
  *  @type: numeric identifier
  *  @family: address family
  *  @owner: module owner
  *  @hook_mask: mask of valid hooks
  *  @hooks: array of hook functions
  *  @ops_register: base chain register function
  *  @ops_unregister: base chain unregister function
  */
 struct nft_chain_type {
     const char          *name;
     enum nft_chain_types        type;
     int             family;
     struct module           *owner;
     unsigned int            hook_mask;
     nf_hookfn           *hooks[NFT_MAX_HOOKS];
     int             (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
     void                (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
 };
 
 int nft_chain_validate_dependency(const struct nft_chain *chain,
                   enum nft_chain_types type);
 int nft_chain_validate_hooks(const struct nft_chain *chain,
                              unsigned int hook_flags);
 
 static inline bool nft_chain_is_bound(struct nft_chain *chain)
 {
     return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
 }
 
 void nft_chain_del(struct nft_chain *chain);
 void nf_tables_chain_destroy(struct nft_ctx *ctx);
 
 struct nft_stats {
     u64         bytes;
     u64         pkts;
     struct u64_stats_sync   syncp;
 };
 
 struct nft_hook {
     struct list_head    list;
     struct nf_hook_ops  ops;
     struct rcu_head     rcu;
 };
 
 /**
  *  struct nft_base_chain - nf_tables base chain
  *
  *  @ops: netfilter hook ops
  *  @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
  *  @type: chain type
  *  @policy: default policy
  *  @stats: per-cpu chain stats
  *  @chain: the chain
  *  @flow_block: flow block (for hardware offload)
  */
 struct nft_base_chain {
     struct nf_hook_ops      ops;
     struct list_head        hook_list;
     const struct nft_chain_type *type;
     u8              policy;
     u8              flags;
     struct nft_stats __percpu   *stats;
     struct nft_chain        chain;
     struct flow_block       flow_block;
 };
 
 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
 {
     return container_of(chain, struct nft_base_chain, chain);
 }
 
 static inline bool nft_is_base_chain(const struct nft_chain *chain)
 {
     return chain->flags & NFT_CHAIN_BASE;
 }
 
 int __nft_release_basechain(struct nft_ctx *ctx);
 
 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
 
 /**
  *  struct nft_table - nf_tables table
  *
  *  @list: used internally
  *  @chains_ht: chains in the table
  *  @chains: same, for stable walks
  *  @sets: sets in the table
  *  @objects: stateful objects in the table
  *  @flowtables: flow tables in the table
  *  @hgenerator: handle generator state
  *  @handle: table handle
  *  @use: number of chain references to this table
  *  @flags: table flag (see enum nft_table_flags)
  *  @genmask: generation mask
  *  @afinfo: address family info
  *  @name: name of the table
  */
 struct nft_table {
     struct list_head        list;
     struct rhltable         chains_ht;
     struct list_head        chains;
     struct list_head        sets;
     struct list_head        objects;
     struct list_head        flowtables;
     u64             hgenerator;
     u64             handle;
     u32             use;
     u16             family:6,
                     flags:8,
                     genmask:2;
     u32             nlpid;
     char                *name;
     u16             udlen;
     u8              *udata;
 };
 
 static inline bool nft_table_has_owner(const struct nft_table *table)
 {
     return table->flags & NFT_TABLE_F_OWNER;
 }
 
 static inline bool nft_base_chain_netdev(int family, u32 hooknum)
 {
     return family == NFPROTO_NETDEV ||
            (family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
 }
 
 void nft_register_chain_type(const struct nft_chain_type *);
 void nft_unregister_chain_type(const struct nft_chain_type *);
 
 int nft_register_expr(struct nft_expr_type *);
 void nft_unregister_expr(struct nft_expr_type *);
 
 int nft_verdict_dump(struct sk_buff *skb, int type,
              const struct nft_verdict *v);
 
 /**
  *  struct nft_object_hash_key - key to lookup nft_object
  *
  *  @name: name of the stateful object to look up
  *  @table: table the object belongs to
  */
 struct nft_object_hash_key {
     const char                      *name;
     const struct nft_table          *table;
 };
 
 /**
  *  struct nft_object - nf_tables stateful object
  *
  *  @list: table stateful object list node
  *  @key:  keys that identify this object
  *  @rhlhead: nft_objname_ht node
  *  @genmask: generation mask
  *  @use: number of references to this stateful object
  *  @handle: unique object handle
  *  @ops: object operations
  *  @data: object data, layout depends on type
  */
 struct nft_object {
     struct list_head        list;
     struct rhlist_head      rhlhead;
     struct nft_object_hash_key  key;
     u32             genmask:2,
                     use:30;
     u64             handle;
     u16             udlen;
     u8              *udata;
     /* runtime data below here */
     const struct nft_object_ops *ops ____cacheline_aligned;
     unsigned char           data[]
         __attribute__((aligned(__alignof__(u64))));
 };
 
 static inline void *nft_obj_data(const struct nft_object *obj)
 {
     return (void *)obj->data;
 }
 
 #define nft_expr_obj(expr)  *((struct nft_object **)nft_expr_priv(expr))
 
 struct nft_object *nft_obj_lookup(const struct net *net,
                   const struct nft_table *table,
                   const struct nlattr *nla, u32 objtype,
                   u8 genmask);
 
 void nft_obj_notify(struct net *net, const struct nft_table *table,
             struct nft_object *obj, u32 portid, u32 seq,
             int event, u16 flags, int family, int report, gfp_t gfp);
 
 /**
  *  struct nft_object_type - stateful object type
  *
  *  @select_ops: function to select nft_object_ops
  *  @ops: default ops, used when no select_ops functions is present
  *  @list: list node in list of object types
  *  @type: stateful object numeric type
  *  @owner: module owner
  *  @maxattr: maximum netlink attribute
  *  @policy: netlink attribute policy
  */
 struct nft_object_type {
     const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
                                const struct nlattr * const tb[]);
     const struct nft_object_ops *ops;
     struct list_head        list;
     u32             type;
     unsigned int                    maxattr;
     struct module           *owner;
     const struct nla_policy     *policy;
 };
 
 /**
  *  struct nft_object_ops - stateful object operations
  *
  *  @eval: stateful object evaluation function
  *  @size: stateful object size
  *  @init: initialize object from netlink attributes
  *  @destroy: release existing stateful object
  *  @dump: netlink dump stateful object
  *  @update: update stateful object
  */
 struct nft_object_ops {
     void                (*eval)(struct nft_object *obj,
                         struct nft_regs *regs,
                         const struct nft_pktinfo *pkt);
     unsigned int            size;
     int             (*init)(const struct nft_ctx *ctx,
                         const struct nlattr *const tb[],
                         struct nft_object *obj);
     void                (*destroy)(const struct nft_ctx *ctx,
                            struct nft_object *obj);
     int             (*dump)(struct sk_buff *skb,
                         struct nft_object *obj,
                         bool reset);
     void                (*update)(struct nft_object *obj,
                           struct nft_object *newobj);
     const struct nft_object_type    *type;
 };
 
 int nft_register_obj(struct nft_object_type *obj_type);
 void nft_unregister_obj(struct nft_object_type *obj_type);
 
 #define NFT_NETDEVICE_MAX   256
 
 /**
  *  struct nft_flowtable - nf_tables flow table
  *
  *  @list: flow table list node in table list
  *  @table: the table the flow table is contained in
  *  @name: name of this flow table
  *  @hooknum: hook number
  *  @ops_len: number of hooks in array
  *  @genmask: generation mask
  *  @use: number of references to this flow table
  *  @handle: unique object handle
  *  @dev_name: array of device names
  *  @data: rhashtable and garbage collector
  *  @ops: array of hooks
  */
 struct nft_flowtable {
     struct list_head        list;
     struct nft_table        *table;
     char                *name;
     int             hooknum;
     int             ops_len;
     u32             genmask:2,
                     use:30;
     u64             handle;
     /* runtime data below here */
     struct list_head        hook_list ____cacheline_aligned;
     struct nf_flowtable     data;
 };
 
 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
                        const struct nlattr *nla,
                        u8 genmask);
 
 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
                     struct nft_flowtable *flowtable,
                     enum nft_trans_phase phase);
 
 void nft_register_flowtable_type(struct nf_flowtable_type *type);
 void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
 
 /**
  *  struct nft_traceinfo - nft tracing information and state
  *
  *  @trace: other struct members are initialised
  *  @nf_trace: copy of skb->nf_trace before rule evaluation
  *  @type: event type (enum nft_trace_types)
  *  @skbid: hash of skb to be used as trace id
  *  @packet_dumped: packet headers sent in a previous traceinfo message
  *  @pkt: pktinfo currently processed
  *  @basechain: base chain currently processed
  *  @chain: chain currently processed
  *  @rule:  rule that was evaluated
  *  @verdict: verdict given by rule
  */
 struct nft_traceinfo {
     bool                trace;
     bool                nf_trace;
     bool                packet_dumped;
     enum nft_trace_types        type:8;
     u32             skbid;
     const struct nft_pktinfo    *pkt;
     const struct nft_base_chain *basechain;
     const struct nft_chain      *chain;
     const struct nft_rule_dp    *rule;
     const struct nft_verdict    *verdict;
 };
 
 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
             const struct nft_verdict *verdict,
             const struct nft_chain *basechain);
 
 void nft_trace_notify(struct nft_traceinfo *info);
 
 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
     MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
 
 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
     MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
 
 #define MODULE_ALIAS_NFT_EXPR(name) \
     MODULE_ALIAS("nft-expr-" name)
 
 #define MODULE_ALIAS_NFT_OBJ(type) \
     MODULE_ALIAS("nft-obj-" __stringify(type))
 
 #if IS_ENABLED(CONFIG_NF_TABLES)
 
 /*
  * The gencursor defines two generations, the currently active and the
  * next one. Objects contain a bitmask of 2 bits specifying the generations
  * they're active in. A set bit means they're inactive in the generation
  * represented by that bit.
  *
  * New objects start out as inactive in the current and active in the
  * next generation. When committing the ruleset the bitmask is cleared,
  * meaning they're active in all generations. When removing an object,
  * it is set inactive in the next generation. After committing the ruleset,
  * the objects are removed.
  */
 static inline unsigned int nft_gencursor_next(const struct net *net)
 {
     return net->nft.gencursor + 1 == 1 ? 1 : 0;
 }
 
 static inline u8 nft_genmask_next(const struct net *net)
 {
     return 1 << nft_gencursor_next(net);
 }
 
 static inline u8 nft_genmask_cur(const struct net *net)
 {
     /* Use READ_ONCE() to prevent refetching the value for atomicity */
     return 1 << READ_ONCE(net->nft.gencursor);
 }
 
 #define NFT_GENMASK_ANY     ((1 << 0) | (1 << 1))
 
 /*
  * Generic transaction helpers
  */
 
 /* Check if this object is currently active. */
 #define nft_is_active(__net, __obj)             \
     (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
 
 /* Check if this object is active in the next generation. */
 #define nft_is_active_next(__net, __obj)            \
     (((__obj)->genmask & nft_genmask_next(__net)) == 0)
 
 /* This object becomes active in the next generation. */
 #define nft_activate_next(__net, __obj)             \
     (__obj)->genmask = nft_genmask_cur(__net)
 
 /* This object becomes inactive in the next generation. */
 #define nft_deactivate_next(__net, __obj)           \
         (__obj)->genmask = nft_genmask_next(__net)
 
 /* After committing the ruleset, clear the stale generation bit. */
 #define nft_clear(__net, __obj)                 \
     (__obj)->genmask &= ~nft_genmask_next(__net)
 #define nft_active_genmask(__obj, __genmask)            \
     !((__obj)->genmask & __genmask)
 
 /*
  * Set element transaction helpers
  */
 
 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
                        u8 genmask)
 {
     return !(ext->genmask & genmask);
 }
 
 static inline void nft_set_elem_change_active(const struct net *net,
                           const struct nft_set *set,
                           struct nft_set_ext *ext)
 {
     ext->genmask ^= nft_genmask_next(net);
 }
 
 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */
 
 /*
  * We use a free bit in the genmask field to indicate the element
  * is busy, meaning it is currently being processed either by
  * the netlink API or GC.
  *
  * Even though the genmask is only a single byte wide, this works
  * because the extension structure if fully constant once initialized,
  * so there are no non-atomic write accesses unless it is already
  * marked busy.
  */
 #define NFT_SET_ELEM_BUSY_MASK  (1 << 2)
 
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 #define NFT_SET_ELEM_BUSY_BIT   2
 #elif defined(__BIG_ENDIAN_BITFIELD)
 #define NFT_SET_ELEM_BUSY_BIT   (BITS_PER_LONG - BITS_PER_BYTE + 2)
 #else
 #error
 #endif
 
 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
 {
     unsigned long *word = (unsigned long *)ext;
 
     BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
     return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
 }
 
 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
 {
     unsigned long *word = (unsigned long *)ext;
 
     clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
 }
 
 /**
  *  struct nft_trans - nf_tables object update in transaction
  *
  *  @list: used internally
  *  @msg_type: message type
  *  @put_net: ctx->net needs to be put
  *  @ctx: transaction context
  *  @data: internal information related to the transaction
  */
 struct nft_trans {
     struct list_head        list;
     int             msg_type;
     bool                put_net;
     struct nft_ctx          ctx;
     char                data[];
 };
 
 struct nft_trans_rule {
     struct nft_rule         *rule;
     struct nft_flow_rule        *flow;
     u32             rule_id;
 };
 
 #define nft_trans_rule(trans)   \
     (((struct nft_trans_rule *)trans->data)->rule)
 #define nft_trans_flow_rule(trans)  \
     (((struct nft_trans_rule *)trans->data)->flow)
 #define nft_trans_rule_id(trans)    \
     (((struct nft_trans_rule *)trans->data)->rule_id)
 
 struct nft_trans_set {
     struct nft_set          *set;
     u32             set_id;
     bool                bound;
 };
 
 #define nft_trans_set(trans)    \
     (((struct nft_trans_set *)trans->data)->set)
 #define nft_trans_set_id(trans) \
     (((struct nft_trans_set *)trans->data)->set_id)
 #define nft_trans_set_bound(trans)  \
     (((struct nft_trans_set *)trans->data)->bound)
 
 struct nft_trans_chain {
     bool                update;
     char                *name;
     struct nft_stats __percpu   *stats;
     u8              policy;
     u32             chain_id;
 };
 
 #define nft_trans_chain_update(trans)   \
     (((struct nft_trans_chain *)trans->data)->update)
 #define nft_trans_chain_name(trans) \
     (((struct nft_trans_chain *)trans->data)->name)
 #define nft_trans_chain_stats(trans)    \
     (((struct nft_trans_chain *)trans->data)->stats)
 #define nft_trans_chain_policy(trans)   \
     (((struct nft_trans_chain *)trans->data)->policy)
 #define nft_trans_chain_id(trans)   \
     (((struct nft_trans_chain *)trans->data)->chain_id)
 
 struct nft_trans_table {
     bool                update;
 };
 
 #define nft_trans_table_update(trans)   \
     (((struct nft_trans_table *)trans->data)->update)
 
 struct nft_trans_elem {
     struct nft_set          *set;
     struct nft_set_elem     elem;
     bool                bound;
 };
 
 #define nft_trans_elem_set(trans)   \
     (((struct nft_trans_elem *)trans->data)->set)
 #define nft_trans_elem(trans)   \
     (((struct nft_trans_elem *)trans->data)->elem)
 #define nft_trans_elem_set_bound(trans) \
     (((struct nft_trans_elem *)trans->data)->bound)
 
 struct nft_trans_obj {
     struct nft_object       *obj;
     struct nft_object       *newobj;
     bool                update;
 };
 
 #define nft_trans_obj(trans)    \
     (((struct nft_trans_obj *)trans->data)->obj)
 #define nft_trans_obj_newobj(trans) \
     (((struct nft_trans_obj *)trans->data)->newobj)
 #define nft_trans_obj_update(trans) \
     (((struct nft_trans_obj *)trans->data)->update)
 
 struct nft_trans_flowtable {
     struct nft_flowtable        *flowtable;
     bool                update;
     struct list_head        hook_list;
     u32             flags;
 };
 
 #define nft_trans_flowtable(trans)  \
     (((struct nft_trans_flowtable *)trans->data)->flowtable)
 #define nft_trans_flowtable_update(trans)   \
     (((struct nft_trans_flowtable *)trans->data)->update)
 #define nft_trans_flowtable_hooks(trans)    \
     (((struct nft_trans_flowtable *)trans->data)->hook_list)
 #define nft_trans_flowtable_flags(trans)    \
     (((struct nft_trans_flowtable *)trans->data)->flags)
 
 int __init nft_chain_filter_init(void);
 void nft_chain_filter_fini(void);
 
 void __init nft_chain_route_init(void);
 void nft_chain_route_fini(void);
 
 void nf_tables_trans_destroy_flush_work(void);
 
 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
 __be64 nf_jiffies64_to_msecs(u64 input);
 
 #ifdef CONFIG_MODULES
 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
 #else
 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
 #endif
 
 struct nftables_pernet {
     struct list_head    tables;
     struct list_head    commit_list;
     struct list_head    module_list;
     struct list_head    notify_list;
     struct mutex        commit_mutex;
     u64         table_handle;
     unsigned int        base_seq;
     u8          validate_state;
 };
 
 extern unsigned int nf_tables_net_id;
 
 static inline struct nftables_pernet *nft_pernet(const struct net *net)
 {
     return net_generic(net, nf_tables_net_id);
 }
 
 #define __NFT_REDUCE_READONLY   1UL
 #define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY
 
 static inline bool nft_reduce_is_readonly(const struct nft_expr *expr)
 {
     return expr->ops->reduce == NFT_REDUCE_READONLY;
 }
 
 void nft_reg_track_update(struct nft_regs_track *track,
               const struct nft_expr *expr, u8 dreg, u8 len);
 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len);
 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg);
 
 static inline bool nft_reg_track_cmp(struct nft_regs_track *track,
                      const struct nft_expr *expr, u8 dreg)
 {
     return track->regs[dreg].selector &&
            track->regs[dreg].selector->ops == expr->ops &&
            track->regs[dreg].num_reg == 0;
 }
 
 #endif /* _NET_NF_TABLES_H */

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