TOMOYO Linux Cross Reference
Linux/include/linux/bpf.h

   /* SPDX-License-Identifier: GPL-2.0-only */
   /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
    */
   #ifndef _LINUX_BPF_H
   #define _LINUX_BPF_H 1
   
   #include <uapi/linux/bpf.h>
   #include <uapi/linux/filter.h>
   
  #include <linux/workqueue.h>
  #include <linux/file.h>
  #include <linux/percpu.h>
  #include <linux/err.h>
  #include <linux/rbtree_latch.h>
  #include <linux/numa.h>
  #include <linux/mm_types.h>
  #include <linux/wait.h>
  #include <linux/refcount.h>
  #include <linux/mutex.h>
  #include <linux/module.h>
  #include <linux/kallsyms.h>
  #include <linux/capability.h>
  #include <linux/sched/mm.h>
  #include <linux/slab.h>
  #include <linux/percpu-refcount.h>
  #include <linux/stddef.h>
  #include <linux/bpfptr.h>
  #include <linux/btf.h>
  #include <linux/rcupdate_trace.h>
  #include <linux/static_call.h>
  #include <linux/memcontrol.h>
  #include <linux/cfi.h>
  
  struct bpf_verifier_env;
  struct bpf_verifier_log;
  struct perf_event;
  struct bpf_prog;
  struct bpf_prog_aux;
  struct bpf_map;
  struct bpf_arena;
  struct sock;
  struct seq_file;
  struct btf;
  struct btf_type;
  struct exception_table_entry;
  struct seq_operations;
  struct bpf_iter_aux_info;
  struct bpf_local_storage;
  struct bpf_local_storage_map;
  struct kobject;
  struct mem_cgroup;
  struct module;
  struct bpf_func_state;
  struct ftrace_ops;
  struct cgroup;
  struct bpf_token;
  struct user_namespace;
  struct super_block;
  struct inode;
  
  extern struct idr btf_idr;
  extern spinlock_t btf_idr_lock;
  extern struct kobject *btf_kobj;
  extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;
  extern bool bpf_global_ma_set;
  
  typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
  typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
                                          struct bpf_iter_aux_info *aux);
  typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
  typedef unsigned int (*bpf_func_t)(const void *,
                                     const struct bpf_insn *);
  struct bpf_iter_seq_info {
          const struct seq_operations *seq_ops;
          bpf_iter_init_seq_priv_t init_seq_private;
          bpf_iter_fini_seq_priv_t fini_seq_private;
          u32 seq_priv_size;
  };
  
  /* map is generic key/value storage optionally accessible by eBPF programs */
  struct bpf_map_ops {
          /* funcs callable from userspace (via syscall) */
          int (*map_alloc_check)(union bpf_attr *attr);
          struct bpf_map *(*map_alloc)(union bpf_attr *attr);
          void (*map_release)(struct bpf_map *map, struct file *map_file);
          void (*map_free)(struct bpf_map *map);
          int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
          void (*map_release_uref)(struct bpf_map *map);
          void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
          int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
                                  union bpf_attr __user *uattr);
          int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
                                            void *value, u64 flags);
          int (*map_lookup_and_delete_batch)(struct bpf_map *map,
                                             const union bpf_attr *attr,
                                             union bpf_attr __user *uattr);
          int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
                                  const union bpf_attr *attr,
                                  union bpf_attr __user *uattr);
         int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
                                 union bpf_attr __user *uattr);
 
         /* funcs callable from userspace and from eBPF programs */
         void *(*map_lookup_elem)(struct bpf_map *map, void *key);
         long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
         long (*map_delete_elem)(struct bpf_map *map, void *key);
         long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
         long (*map_pop_elem)(struct bpf_map *map, void *value);
         long (*map_peek_elem)(struct bpf_map *map, void *value);
         void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
 
         /* funcs called by prog_array and perf_event_array map */
         void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
                                 int fd);
         /* If need_defer is true, the implementation should guarantee that
          * the to-be-put element is still alive before the bpf program, which
          * may manipulate it, exists.
          */
         void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);
         int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
         u32 (*map_fd_sys_lookup_elem)(void *ptr);
         void (*map_seq_show_elem)(struct bpf_map *map, void *key,
                                   struct seq_file *m);
         int (*map_check_btf)(const struct bpf_map *map,
                              const struct btf *btf,
                              const struct btf_type *key_type,
                              const struct btf_type *value_type);
 
         /* Prog poke tracking helpers. */
         int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
         void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
         void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
                              struct bpf_prog *new);
 
         /* Direct value access helpers. */
         int (*map_direct_value_addr)(const struct bpf_map *map,
                                      u64 *imm, u32 off);
         int (*map_direct_value_meta)(const struct bpf_map *map,
                                      u64 imm, u32 *off);
         int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
         __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
                              struct poll_table_struct *pts);
         unsigned long (*map_get_unmapped_area)(struct file *filep, unsigned long addr,
                                                unsigned long len, unsigned long pgoff,
                                                unsigned long flags);
 
         /* Functions called by bpf_local_storage maps */
         int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
                                         void *owner, u32 size);
         void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
                                            void *owner, u32 size);
         struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
 
         /* Misc helpers.*/
         long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
 
         /* map_meta_equal must be implemented for maps that can be
          * used as an inner map.  It is a runtime check to ensure
          * an inner map can be inserted to an outer map.
          *
          * Some properties of the inner map has been used during the
          * verification time.  When inserting an inner map at the runtime,
          * map_meta_equal has to ensure the inserting map has the same
          * properties that the verifier has used earlier.
          */
         bool (*map_meta_equal)(const struct bpf_map *meta0,
                                const struct bpf_map *meta1);
 
 
         int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
                                               struct bpf_func_state *caller,
                                               struct bpf_func_state *callee);
         long (*map_for_each_callback)(struct bpf_map *map,
                                      bpf_callback_t callback_fn,
                                      void *callback_ctx, u64 flags);
 
         u64 (*map_mem_usage)(const struct bpf_map *map);
 
         /* BTF id of struct allocated by map_alloc */
         int *map_btf_id;
 
         /* bpf_iter info used to open a seq_file */
         const struct bpf_iter_seq_info *iter_seq_info;
 };
 
 enum {
         /* Support at most 11 fields in a BTF type */
         BTF_FIELDS_MAX     = 11,
 };
 
 enum btf_field_type {
         BPF_SPIN_LOCK  = (1 << 0),
         BPF_TIMER      = (1 << 1),
         BPF_KPTR_UNREF = (1 << 2),
         BPF_KPTR_REF   = (1 << 3),
         BPF_KPTR_PERCPU = (1 << 4),
         BPF_KPTR       = BPF_KPTR_UNREF | BPF_KPTR_REF | BPF_KPTR_PERCPU,
         BPF_LIST_HEAD  = (1 << 5),
         BPF_LIST_NODE  = (1 << 6),
         BPF_RB_ROOT    = (1 << 7),
         BPF_RB_NODE    = (1 << 8),
         BPF_GRAPH_NODE = BPF_RB_NODE | BPF_LIST_NODE,
         BPF_GRAPH_ROOT = BPF_RB_ROOT | BPF_LIST_HEAD,
         BPF_REFCOUNT   = (1 << 9),
         BPF_WORKQUEUE  = (1 << 10),
 };
 
 typedef void (*btf_dtor_kfunc_t)(void *);
 
 struct btf_field_kptr {
         struct btf *btf;
         struct module *module;
         /* dtor used if btf_is_kernel(btf), otherwise the type is
          * program-allocated, dtor is NULL,  and __bpf_obj_drop_impl is used
          */
         btf_dtor_kfunc_t dtor;
         u32 btf_id;
 };
 
 struct btf_field_graph_root {
         struct btf *btf;
         u32 value_btf_id;
         u32 node_offset;
         struct btf_record *value_rec;
 };
 
 struct btf_field {
         u32 offset;
         u32 size;
         enum btf_field_type type;
         union {
                 struct btf_field_kptr kptr;
                 struct btf_field_graph_root graph_root;
         };
 };
 
 struct btf_record {
         u32 cnt;
         u32 field_mask;
         int spin_lock_off;
         int timer_off;
         int wq_off;
         int refcount_off;
         struct btf_field fields[];
 };
 
 /* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
 struct bpf_rb_node_kern {
         struct rb_node rb_node;
         void *owner;
 } __attribute__((aligned(8)));
 
 /* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
 struct bpf_list_node_kern {
         struct list_head list_head;
         void *owner;
 } __attribute__((aligned(8)));
 
 struct bpf_map {
         const struct bpf_map_ops *ops;
         struct bpf_map *inner_map_meta;
 #ifdef CONFIG_SECURITY
         void *security;
 #endif
         enum bpf_map_type map_type;
         u32 key_size;
         u32 value_size;
         u32 max_entries;
         u64 map_extra; /* any per-map-type extra fields */
         u32 map_flags;
         u32 id;
         struct btf_record *record;
         int numa_node;
         u32 btf_key_type_id;
         u32 btf_value_type_id;
         u32 btf_vmlinux_value_type_id;
         struct btf *btf;
 #ifdef CONFIG_MEMCG
         struct obj_cgroup *objcg;
 #endif
         char name[BPF_OBJ_NAME_LEN];
         struct mutex freeze_mutex;
         atomic64_t refcnt;
         atomic64_t usercnt;
         /* rcu is used before freeing and work is only used during freeing */
         union {
                 struct work_struct work;
                 struct rcu_head rcu;
         };
         atomic64_t writecnt;
         /* 'Ownership' of program-containing map is claimed by the first program
          * that is going to use this map or by the first program which FD is
          * stored in the map to make sure that all callers and callees have the
          * same prog type, JITed flag and xdp_has_frags flag.
          */
         struct {
                 spinlock_t lock;
                 enum bpf_prog_type type;
                 bool jited;
                 bool xdp_has_frags;
         } owner;
         bool bypass_spec_v1;
         bool frozen; /* write-once; write-protected by freeze_mutex */
         bool free_after_mult_rcu_gp;
         bool free_after_rcu_gp;
         atomic64_t sleepable_refcnt;
         s64 __percpu *elem_count;
 };
 
 static inline const char *btf_field_type_name(enum btf_field_type type)
 {
         switch (type) {
         case BPF_SPIN_LOCK:
                 return "bpf_spin_lock";
         case BPF_TIMER:
                 return "bpf_timer";
         case BPF_WORKQUEUE:
                 return "bpf_wq";
         case BPF_KPTR_UNREF:
         case BPF_KPTR_REF:
                 return "kptr";
         case BPF_KPTR_PERCPU:
                 return "percpu_kptr";
         case BPF_LIST_HEAD:
                 return "bpf_list_head";
         case BPF_LIST_NODE:
                 return "bpf_list_node";
         case BPF_RB_ROOT:
                 return "bpf_rb_root";
         case BPF_RB_NODE:
                 return "bpf_rb_node";
         case BPF_REFCOUNT:
                 return "bpf_refcount";
         default:
                 WARN_ON_ONCE(1);
                 return "unknown";
         }
 }
 
 static inline u32 btf_field_type_size(enum btf_field_type type)
 {
         switch (type) {
         case BPF_SPIN_LOCK:
                 return sizeof(struct bpf_spin_lock);
         case BPF_TIMER:
                 return sizeof(struct bpf_timer);
         case BPF_WORKQUEUE:
                 return sizeof(struct bpf_wq);
         case BPF_KPTR_UNREF:
         case BPF_KPTR_REF:
         case BPF_KPTR_PERCPU:
                 return sizeof(u64);
         case BPF_LIST_HEAD:
                 return sizeof(struct bpf_list_head);
         case BPF_LIST_NODE:
                 return sizeof(struct bpf_list_node);
         case BPF_RB_ROOT:
                 return sizeof(struct bpf_rb_root);
         case BPF_RB_NODE:
                 return sizeof(struct bpf_rb_node);
         case BPF_REFCOUNT:
                 return sizeof(struct bpf_refcount);
         default:
                 WARN_ON_ONCE(1);
                 return 0;
         }
 }
 
 static inline u32 btf_field_type_align(enum btf_field_type type)
 {
         switch (type) {
         case BPF_SPIN_LOCK:
                 return __alignof__(struct bpf_spin_lock);
         case BPF_TIMER:
                 return __alignof__(struct bpf_timer);
         case BPF_WORKQUEUE:
                 return __alignof__(struct bpf_wq);
         case BPF_KPTR_UNREF:
         case BPF_KPTR_REF:
         case BPF_KPTR_PERCPU:
                 return __alignof__(u64);
         case BPF_LIST_HEAD:
                 return __alignof__(struct bpf_list_head);
         case BPF_LIST_NODE:
                 return __alignof__(struct bpf_list_node);
         case BPF_RB_ROOT:
                 return __alignof__(struct bpf_rb_root);
         case BPF_RB_NODE:
                 return __alignof__(struct bpf_rb_node);
         case BPF_REFCOUNT:
                 return __alignof__(struct bpf_refcount);
         default:
                 WARN_ON_ONCE(1);
                 return 0;
         }
 }
 
 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
 {
         memset(addr, 0, field->size);
 
         switch (field->type) {
         case BPF_REFCOUNT:
                 refcount_set((refcount_t *)addr, 1);
                 break;
         case BPF_RB_NODE:
                 RB_CLEAR_NODE((struct rb_node *)addr);
                 break;
         case BPF_LIST_HEAD:
         case BPF_LIST_NODE:
                 INIT_LIST_HEAD((struct list_head *)addr);
                 break;
         case BPF_RB_ROOT:
                 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
         case BPF_SPIN_LOCK:
         case BPF_TIMER:
         case BPF_WORKQUEUE:
         case BPF_KPTR_UNREF:
         case BPF_KPTR_REF:
         case BPF_KPTR_PERCPU:
                 break;
         default:
                 WARN_ON_ONCE(1);
                 return;
         }
 }
 
 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
 {
         if (IS_ERR_OR_NULL(rec))
                 return false;
         return rec->field_mask & type;
 }
 
 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
 {
         int i;
 
         if (IS_ERR_OR_NULL(rec))
                 return;
         for (i = 0; i < rec->cnt; i++)
                 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
 }
 
 /* 'dst' must be a temporary buffer and should not point to memory that is being
  * used in parallel by a bpf program or bpf syscall, otherwise the access from
  * the bpf program or bpf syscall may be corrupted by the reinitialization,
  * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
  * allocator, it is still possible for 'dst' to be used in parallel by a bpf
  * program or bpf syscall.
  */
 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
 {
         bpf_obj_init(map->record, dst);
 }
 
 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
  * forced to use 'long' read/writes to try to atomically copy long counters.
  * Best-effort only.  No barriers here, since it _will_ race with concurrent
  * updates from BPF programs. Called from bpf syscall and mostly used with
  * size 8 or 16 bytes, so ask compiler to inline it.
  */
 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
 {
         const long *lsrc = src;
         long *ldst = dst;
 
         size /= sizeof(long);
         while (size--)
                 data_race(*ldst++ = *lsrc++);
 }
 
 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
 static inline void bpf_obj_memcpy(struct btf_record *rec,
                                   void *dst, void *src, u32 size,
                                   bool long_memcpy)
 {
         u32 curr_off = 0;
         int i;
 
         if (IS_ERR_OR_NULL(rec)) {
                 if (long_memcpy)
                         bpf_long_memcpy(dst, src, round_up(size, 8));
                 else
                         memcpy(dst, src, size);
                 return;
         }
 
         for (i = 0; i < rec->cnt; i++) {
                 u32 next_off = rec->fields[i].offset;
                 u32 sz = next_off - curr_off;
 
                 memcpy(dst + curr_off, src + curr_off, sz);
                 curr_off += rec->fields[i].size + sz;
         }
         memcpy(dst + curr_off, src + curr_off, size - curr_off);
 }
 
 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
 {
         bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
 }
 
 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
 {
         bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
 }
 
 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
 {
         u32 curr_off = 0;
         int i;
 
         if (IS_ERR_OR_NULL(rec)) {
                 memset(dst, 0, size);
                 return;
         }
 
         for (i = 0; i < rec->cnt; i++) {
                 u32 next_off = rec->fields[i].offset;
                 u32 sz = next_off - curr_off;
 
                 memset(dst + curr_off, 0, sz);
                 curr_off += rec->fields[i].size + sz;
         }
         memset(dst + curr_off, 0, size - curr_off);
 }
 
 static inline void zero_map_value(struct bpf_map *map, void *dst)
 {
         bpf_obj_memzero(map->record, dst, map->value_size);
 }
 
 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
                            bool lock_src);
 void bpf_timer_cancel_and_free(void *timer);
 void bpf_wq_cancel_and_free(void *timer);
 void bpf_list_head_free(const struct btf_field *field, void *list_head,
                         struct bpf_spin_lock *spin_lock);
 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
                       struct bpf_spin_lock *spin_lock);
 u64 bpf_arena_get_kern_vm_start(struct bpf_arena *arena);
 u64 bpf_arena_get_user_vm_start(struct bpf_arena *arena);
 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
 
 struct bpf_offload_dev;
 struct bpf_offloaded_map;
 
 struct bpf_map_dev_ops {
         int (*map_get_next_key)(struct bpf_offloaded_map *map,
                                 void *key, void *next_key);
         int (*map_lookup_elem)(struct bpf_offloaded_map *map,
                                void *key, void *value);
         int (*map_update_elem)(struct bpf_offloaded_map *map,
                                void *key, void *value, u64 flags);
         int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
 };
 
 struct bpf_offloaded_map {
         struct bpf_map map;
         struct net_device *netdev;
         const struct bpf_map_dev_ops *dev_ops;
         void *dev_priv;
         struct list_head offloads;
 };
 
 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
 {
         return container_of(map, struct bpf_offloaded_map, map);
 }
 
 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
 {
         return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
 }
 
 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
 {
         return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
                 map->ops->map_seq_show_elem;
 }
 
 int map_check_no_btf(const struct bpf_map *map,
                      const struct btf *btf,
                      const struct btf_type *key_type,
                      const struct btf_type *value_type);
 
 bool bpf_map_meta_equal(const struct bpf_map *meta0,
                         const struct bpf_map *meta1);
 
 extern const struct bpf_map_ops bpf_map_offload_ops;
 
 /* bpf_type_flag contains a set of flags that are applicable to the values of
  * arg_type, ret_type and reg_type. For example, a pointer value may be null,
  * or a memory is read-only. We classify types into two categories: base types
  * and extended types. Extended types are base types combined with a type flag.
  *
  * Currently there are no more than 32 base types in arg_type, ret_type and
  * reg_types.
  */
 #define BPF_BASE_TYPE_BITS      8
 
 enum bpf_type_flag {
         /* PTR may be NULL. */
         PTR_MAYBE_NULL          = BIT(0 + BPF_BASE_TYPE_BITS),
 
         /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
          * compatible with both mutable and immutable memory.
          */
         MEM_RDONLY              = BIT(1 + BPF_BASE_TYPE_BITS),
 
         /* MEM points to BPF ring buffer reservation. */
         MEM_RINGBUF             = BIT(2 + BPF_BASE_TYPE_BITS),
 
         /* MEM is in user address space. */
         MEM_USER                = BIT(3 + BPF_BASE_TYPE_BITS),
 
         /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
          * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
          * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
          * or bpf_this_cpu_ptr(), which will return the pointer corresponding
          * to the specified cpu.
          */
         MEM_PERCPU              = BIT(4 + BPF_BASE_TYPE_BITS),
 
         /* Indicates that the argument will be released. */
         OBJ_RELEASE             = BIT(5 + BPF_BASE_TYPE_BITS),
 
         /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
          * unreferenced and referenced kptr loaded from map value using a load
          * instruction, so that they can only be dereferenced but not escape the
          * BPF program into the kernel (i.e. cannot be passed as arguments to
          * kfunc or bpf helpers).
          */
         PTR_UNTRUSTED           = BIT(6 + BPF_BASE_TYPE_BITS),
 
         MEM_UNINIT              = BIT(7 + BPF_BASE_TYPE_BITS),
 
         /* DYNPTR points to memory local to the bpf program. */
         DYNPTR_TYPE_LOCAL       = BIT(8 + BPF_BASE_TYPE_BITS),
 
         /* DYNPTR points to a kernel-produced ringbuf record. */
         DYNPTR_TYPE_RINGBUF     = BIT(9 + BPF_BASE_TYPE_BITS),
 
         /* Size is known at compile time. */
         MEM_FIXED_SIZE          = BIT(10 + BPF_BASE_TYPE_BITS),
 
         /* MEM is of an allocated object of type in program BTF. This is used to
          * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
          */
         MEM_ALLOC               = BIT(11 + BPF_BASE_TYPE_BITS),
 
         /* PTR was passed from the kernel in a trusted context, and may be
          * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
          * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
          * PTR_UNTRUSTED refers to a kptr that was read directly from a map
          * without invoking bpf_kptr_xchg(). What we really need to know is
          * whether a pointer is safe to pass to a kfunc or BPF helper function.
          * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
          * helpers, they do not cover all possible instances of unsafe
          * pointers. For example, a pointer that was obtained from walking a
          * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
          * fact that it may be NULL, invalid, etc. This is due to backwards
          * compatibility requirements, as this was the behavior that was first
          * introduced when kptrs were added. The behavior is now considered
          * deprecated, and PTR_UNTRUSTED will eventually be removed.
          *
          * PTR_TRUSTED, on the other hand, is a pointer that the kernel
          * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
          * For example, pointers passed to tracepoint arguments are considered
          * PTR_TRUSTED, as are pointers that are passed to struct_ops
          * callbacks. As alluded to above, pointers that are obtained from
          * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
          * struct task_struct *task is PTR_TRUSTED, then accessing
          * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
          * in a BPF register. Similarly, pointers passed to certain programs
          * types such as kretprobes are not guaranteed to be valid, as they may
          * for example contain an object that was recently freed.
          */
         PTR_TRUSTED             = BIT(12 + BPF_BASE_TYPE_BITS),
 
         /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
         MEM_RCU                 = BIT(13 + BPF_BASE_TYPE_BITS),
 
         /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
          * Currently only valid for linked-list and rbtree nodes. If the nodes
          * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
          */
         NON_OWN_REF             = BIT(14 + BPF_BASE_TYPE_BITS),
 
         /* DYNPTR points to sk_buff */
         DYNPTR_TYPE_SKB         = BIT(15 + BPF_BASE_TYPE_BITS),
 
         /* DYNPTR points to xdp_buff */
         DYNPTR_TYPE_XDP         = BIT(16 + BPF_BASE_TYPE_BITS),
 
         __BPF_TYPE_FLAG_MAX,
         __BPF_TYPE_LAST_FLAG    = __BPF_TYPE_FLAG_MAX - 1,
 };
 
 #define DYNPTR_TYPE_FLAG_MASK   (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
                                  | DYNPTR_TYPE_XDP)
 
 /* Max number of base types. */
 #define BPF_BASE_TYPE_LIMIT     (1UL << BPF_BASE_TYPE_BITS)
 
 /* Max number of all types. */
 #define BPF_TYPE_LIMIT          (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
 
 /* function argument constraints */
 enum bpf_arg_type {
         ARG_DONTCARE = 0,       /* unused argument in helper function */
 
         /* the following constraints used to prototype
          * bpf_map_lookup/update/delete_elem() functions
          */
         ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
         ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
         ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
 
         /* Used to prototype bpf_memcmp() and other functions that access data
          * on eBPF program stack
          */
         ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
         ARG_PTR_TO_ARENA,
 
         ARG_CONST_SIZE,         /* number of bytes accessed from memory */
         ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
 
         ARG_PTR_TO_CTX,         /* pointer to context */
         ARG_ANYTHING,           /* any (initialized) argument is ok */
         ARG_PTR_TO_SPIN_LOCK,   /* pointer to bpf_spin_lock */
         ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
         ARG_PTR_TO_INT,         /* pointer to int */
         ARG_PTR_TO_LONG,        /* pointer to long */
         ARG_PTR_TO_SOCKET,      /* pointer to bpf_sock (fullsock) */
         ARG_PTR_TO_BTF_ID,      /* pointer to in-kernel struct */
         ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
         ARG_CONST_ALLOC_SIZE_OR_ZERO,   /* number of allocated bytes requested */
         ARG_PTR_TO_BTF_ID_SOCK_COMMON,  /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
         ARG_PTR_TO_PERCPU_BTF_ID,       /* pointer to in-kernel percpu type */
         ARG_PTR_TO_FUNC,        /* pointer to a bpf program function */
         ARG_PTR_TO_STACK,       /* pointer to stack */
         ARG_PTR_TO_CONST_STR,   /* pointer to a null terminated read-only string */
         ARG_PTR_TO_TIMER,       /* pointer to bpf_timer */
         ARG_PTR_TO_KPTR,        /* pointer to referenced kptr */
         ARG_PTR_TO_DYNPTR,      /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
         __BPF_ARG_TYPE_MAX,
 
         /* Extended arg_types. */
         ARG_PTR_TO_MAP_VALUE_OR_NULL    = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
         ARG_PTR_TO_MEM_OR_NULL          = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
         ARG_PTR_TO_CTX_OR_NULL          = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
         ARG_PTR_TO_SOCKET_OR_NULL       = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
         ARG_PTR_TO_STACK_OR_NULL        = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
         ARG_PTR_TO_BTF_ID_OR_NULL       = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
         /* pointer to memory does not need to be initialized, helper function must fill
          * all bytes or clear them in error case.
          */
         ARG_PTR_TO_UNINIT_MEM           = MEM_UNINIT | ARG_PTR_TO_MEM,
         /* Pointer to valid memory of size known at compile time. */
         ARG_PTR_TO_FIXED_SIZE_MEM       = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
 
         /* This must be the last entry. Its purpose is to ensure the enum is
          * wide enough to hold the higher bits reserved for bpf_type_flag.
          */
         __BPF_ARG_TYPE_LIMIT    = BPF_TYPE_LIMIT,
 };
 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
 
 /* type of values returned from helper functions */
 enum bpf_return_type {
         RET_INTEGER,                    /* function returns integer */
         RET_VOID,                       /* function doesn't return anything */
         RET_PTR_TO_MAP_VALUE,           /* returns a pointer to map elem value */
         RET_PTR_TO_SOCKET,              /* returns a pointer to a socket */
         RET_PTR_TO_TCP_SOCK,            /* returns a pointer to a tcp_sock */
         RET_PTR_TO_SOCK_COMMON,         /* returns a pointer to a sock_common */
         RET_PTR_TO_MEM,                 /* returns a pointer to memory */
         RET_PTR_TO_MEM_OR_BTF_ID,       /* returns a pointer to a valid memory or a btf_id */
         RET_PTR_TO_BTF_ID,              /* returns a pointer to a btf_id */
         __BPF_RET_TYPE_MAX,
 
         /* Extended ret_types. */
         RET_PTR_TO_MAP_VALUE_OR_NULL    = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
         RET_PTR_TO_SOCKET_OR_NULL       = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
         RET_PTR_TO_TCP_SOCK_OR_NULL     = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
         RET_PTR_TO_SOCK_COMMON_OR_NULL  = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
         RET_PTR_TO_RINGBUF_MEM_OR_NULL  = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
         RET_PTR_TO_DYNPTR_MEM_OR_NULL   = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
         RET_PTR_TO_BTF_ID_OR_NULL       = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
         RET_PTR_TO_BTF_ID_TRUSTED       = PTR_TRUSTED    | RET_PTR_TO_BTF_ID,
 
         /* This must be the last entry. Its purpose is to ensure the enum is
          * wide enough to hold the higher bits reserved for bpf_type_flag.
          */
         __BPF_RET_TYPE_LIMIT    = BPF_TYPE_LIMIT,
 };
 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
 
 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
  * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
  * instructions after verifying
  */
 struct bpf_func_proto {
         u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
         bool gpl_only;
         bool pkt_access;
         bool might_sleep;
         enum bpf_return_type ret_type;
         union {
                 struct {
                         enum bpf_arg_type arg1_type;
                         enum bpf_arg_type arg2_type;
                         enum bpf_arg_type arg3_type;
                         enum bpf_arg_type arg4_type;
                         enum bpf_arg_type arg5_type;
                 };
                 enum bpf_arg_type arg_type[5];
         };
         union {
                 struct {
                         u32 *arg1_btf_id;
                         u32 *arg2_btf_id;
                         u32 *arg3_btf_id;
                         u32 *arg4_btf_id;
                         u32 *arg5_btf_id;
                 };
                 u32 *arg_btf_id[5];
                 struct {
                         size_t arg1_size;
                         size_t arg2_size;
                         size_t arg3_size;
                         size_t arg4_size;
                         size_t arg5_size;
                 };
                 size_t arg_size[5];
         };
         int *ret_btf_id; /* return value btf_id */
         bool (*allowed)(const struct bpf_prog *prog);
 };
 
 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
  * the first argument to eBPF programs.
  * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
  */
 struct bpf_context;
 
 enum bpf_access_type {
         BPF_READ = 1,
         BPF_WRITE = 2
 };
 
 /* types of values stored in eBPF registers */
 /* Pointer types represent:
  * pointer
  * pointer + imm
  * pointer + (u16) var
  * pointer + (u16) var + imm
  * if (range > 0) then [ptr, ptr + range - off) is safe to access
  * if (id > 0) means that some 'var' was added
  * if (off > 0) means that 'imm' was added
  */
 enum bpf_reg_type {
         NOT_INIT = 0,            /* nothing was written into register */
         SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
         PTR_TO_CTX,              /* reg points to bpf_context */
         CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
         PTR_TO_MAP_VALUE,        /* reg points to map element value */
         PTR_TO_MAP_KEY,          /* reg points to a map element key */
         PTR_TO_STACK,            /* reg == frame_pointer + offset */
         PTR_TO_PACKET_META,      /* skb->data - meta_len */
         PTR_TO_PACKET,           /* reg points to skb->data */
         PTR_TO_PACKET_END,       /* skb->data + headlen */
         PTR_TO_FLOW_KEYS,        /* reg points to bpf_flow_keys */
         PTR_TO_SOCKET,           /* reg points to struct bpf_sock */
         PTR_TO_SOCK_COMMON,      /* reg points to sock_common */
         PTR_TO_TCP_SOCK,         /* reg points to struct tcp_sock */
         PTR_TO_TP_BUFFER,        /* reg points to a writable raw tp's buffer */
         PTR_TO_XDP_SOCK,         /* reg points to struct xdp_sock */
         /* PTR_TO_BTF_ID points to a kernel struct that does not need
          * to be null checked by the BPF program. This does not imply the
          * pointer is _not_ null and in practice this can easily be a null
          * pointer when reading pointer chains. The assumption is program
          * context will handle null pointer dereference typically via fault
          * handling. The verifier must keep this in mind and can make no
          * assumptions about null or non-null when doing branch analysis.
          * Further, when passed into helpers the helpers can not, without
          * additional context, assume the value is non-null.
          */
         PTR_TO_BTF_ID,
         /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
          * been checked for null. Used primarily to inform the verifier
          * an explicit null check is required for this struct.
          */
         PTR_TO_MEM,              /* reg points to valid memory region */
         PTR_TO_ARENA,
         PTR_TO_BUF,              /* reg points to a read/write buffer */
         PTR_TO_FUNC,             /* reg points to a bpf program function */
         CONST_PTR_TO_DYNPTR,     /* reg points to a const struct bpf_dynptr */
         __BPF_REG_TYPE_MAX,
 
         /* Extended reg_types. */
         PTR_TO_MAP_VALUE_OR_NULL        = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
         PTR_TO_SOCKET_OR_NULL           = PTR_MAYBE_NULL | PTR_TO_SOCKET,
         PTR_TO_SOCK_COMMON_OR_NULL      = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
         PTR_TO_TCP_SOCK_OR_NULL         = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
         PTR_TO_BTF_ID_OR_NULL           = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
 
         /* This must be the last entry. Its purpose is to ensure the enum is
          * wide enough to hold the higher bits reserved for bpf_type_flag.
          */
         __BPF_REG_TYPE_LIMIT    = BPF_TYPE_LIMIT,
 };
 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
 
 /* The information passed from prog-specific *_is_valid_access
  * back to the verifier.
  */
 struct bpf_insn_access_aux {
         enum bpf_reg_type reg_type;
         union {
                 int ctx_field_size;
                 struct {
                         struct btf *btf;
                         u32 btf_id;
                 };
         };
         struct bpf_verifier_log *log; /* for verbose logs */
 };
 
 static inline void
 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
 {
         aux->ctx_field_size = size;
 }
 
 static bool bpf_is_ldimm64(const struct bpf_insn *insn)
 {
         return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
 }
 
 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
 {
         return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
 }
 
 struct bpf_prog_ops {
         int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
                         union bpf_attr __user *uattr);
 };
 
 struct bpf_reg_state;
 struct bpf_verifier_ops {
         /* return eBPF function prototype for verification */
         const struct bpf_func_proto *
         (*get_func_proto)(enum bpf_func_id func_id,
                           const struct bpf_prog *prog);
 
         /* return true if 'size' wide access at offset 'off' within bpf_context
          * with 'type' (read or write) is allowed
          */
         bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
                                 const struct bpf_prog *prog,
                                 struct bpf_insn_access_aux *info);
         int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
                             const struct bpf_prog *prog);
         int (*gen_ld_abs)(const struct bpf_insn *orig,
                           struct bpf_insn *insn_buf);
         u32 (*convert_ctx_access)(enum bpf_access_type type,
                                   const struct bpf_insn *src,
                                   struct bpf_insn *dst,
                                   struct bpf_prog *prog, u32 *target_size);
         int (*btf_struct_access)(struct bpf_verifier_log *log,
                                  const struct bpf_reg_state *reg,
                                  int off, int size);
 };
 
 struct bpf_prog_offload_ops {
         /* verifier basic callbacks */
         int (*insn_hook)(struct bpf_verifier_env *env,
                          int insn_idx, int prev_insn_idx);
         int (*finalize)(struct bpf_verifier_env *env);
         /* verifier optimization callbacks (called after .finalize) */
         int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
                             struct bpf_insn *insn);
         int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
         /* program management callbacks */
         int (*prepare)(struct bpf_prog *prog);
         int (*translate)(struct bpf_prog *prog);
         void (*destroy)(struct bpf_prog *prog);
 };
 
 struct bpf_prog_offload {
         struct bpf_prog         *prog;
         struct net_device       *netdev;
         struct bpf_offload_dev  *offdev;
         void                    *dev_priv;
         struct list_head        offloads;
         bool                    dev_state;
         bool                    opt_failed;
         void                    *jited_image;
         u32                     jited_len;
 };
 
 enum bpf_cgroup_storage_type {
         BPF_CGROUP_STORAGE_SHARED,
         BPF_CGROUP_STORAGE_PERCPU,
         __BPF_CGROUP_STORAGE_MAX
 };
 
 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
 
 /* The longest tracepoint has 12 args.
  * See include/trace/bpf_probe.h
  */
 #define MAX_BPF_FUNC_ARGS 12
 
 /* The maximum number of arguments passed through registers
  * a single function may have.
  */
 #define MAX_BPF_FUNC_REG_ARGS 5
 
 /* The argument is a structure. */
 #define BTF_FMODEL_STRUCT_ARG           BIT(0)
 
 /* The argument is signed. */
 #define BTF_FMODEL_SIGNED_ARG           BIT(1)
 
 struct btf_func_model {
         u8 ret_size;
         u8 ret_flags;
         u8 nr_args;
         u8 arg_size[MAX_BPF_FUNC_ARGS];
         u8 arg_flags[MAX_BPF_FUNC_ARGS];
 };
 
 /* Restore arguments before returning from trampoline to let original function
  * continue executing. This flag is used for fentry progs when there are no
  * fexit progs.
  */
 #define BPF_TRAMP_F_RESTORE_REGS        BIT(0)
 /* Call original function after fentry progs, but before fexit progs.
  * Makes sense for fentry/fexit, normal calls and indirect calls.
  */
 #define BPF_TRAMP_F_CALL_ORIG           BIT(1)
 /* Skip current frame and return to parent.  Makes sense for fentry/fexit
  * programs only. Should not be used with normal calls and indirect calls.
  */
 #define BPF_TRAMP_F_SKIP_FRAME          BIT(2)
 /* Store IP address of the caller on the trampoline stack,
  * so it's available for trampoline's programs.
  */
 #define BPF_TRAMP_F_IP_ARG              BIT(3)
 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
 #define BPF_TRAMP_F_RET_FENTRY_RET      BIT(4)
 
 /* Get original function from stack instead of from provided direct address.
  * Makes sense for trampolines with fexit or fmod_ret programs.
  */
 #define BPF_TRAMP_F_ORIG_STACK          BIT(5)
 
 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
  * e.g., a live patch. This flag is set and cleared by ftrace call backs,
  */
 #define BPF_TRAMP_F_SHARE_IPMODIFY      BIT(6)
 
 /* Indicate that current trampoline is in a tail call context. Then, it has to
  * cache and restore tail_call_cnt to avoid infinite tail call loop.
  */
 #define BPF_TRAMP_F_TAIL_CALL_CTX       BIT(7)
 
 /*
  * Indicate the trampoline should be suitable to receive indirect calls;
  * without this indirectly calling the generated code can result in #UD/#CP,
  * depending on the CFI options.
  *
  * Used by bpf_struct_ops.
  *
  * Incompatible with FENTRY usage, overloads @func_addr argument.
  */
 #define BPF_TRAMP_F_INDIRECT            BIT(8)
 
 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
  * bytes on x86.
  */
 enum {
 #if defined(__s390x__)
         BPF_MAX_TRAMP_LINKS = 27,
 #else
         BPF_MAX_TRAMP_LINKS = 38,
 #endif
 };
 
 struct bpf_tramp_links {
         struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
         int nr_links;
 };
 
 struct bpf_tramp_run_ctx;
 
 /* Different use cases for BPF trampoline:
  * 1. replace nop at the function entry (kprobe equivalent)
  *    flags = BPF_TRAMP_F_RESTORE_REGS
  *    fentry = a set of programs to run before returning from trampoline
  *
  * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
  *    flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
  *    orig_call = fentry_ip + MCOUNT_INSN_SIZE
  *    fentry = a set of program to run before calling original function
  *    fexit = a set of program to run after original function
  *
  * 3. replace direct call instruction anywhere in the function body
  *    or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
  *    With flags = 0
  *      fentry = a set of programs to run before returning from trampoline
  *    With flags = BPF_TRAMP_F_CALL_ORIG
  *      orig_call = original callback addr or direct function addr
  *      fentry = a set of program to run before calling original function
  *      fexit = a set of program to run after original function
  */
 struct bpf_tramp_image;
 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *image_end,
                                 const struct btf_func_model *m, u32 flags,
                                 struct bpf_tramp_links *tlinks,
                                 void *func_addr);
 void *arch_alloc_bpf_trampoline(unsigned int size);
 void arch_free_bpf_trampoline(void *image, unsigned int size);
 int __must_check arch_protect_bpf_trampoline(void *image, unsigned int size);
 int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
                              struct bpf_tramp_links *tlinks, void *func_addr);
 
 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
                                              struct bpf_tramp_run_ctx *run_ctx);
 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
                                              struct bpf_tramp_run_ctx *run_ctx);
 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
                                       struct bpf_tramp_run_ctx *run_ctx);
 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
                                       struct bpf_tramp_run_ctx *run_ctx);
 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
 
 struct bpf_ksym {
         unsigned long            start;
         unsigned long            end;
         char                     name[KSYM_NAME_LEN];
         struct list_head         lnode;
         struct latch_tree_node   tnode;
         bool                     prog;
 };
 
 enum bpf_tramp_prog_type {
         BPF_TRAMP_FENTRY,
         BPF_TRAMP_FEXIT,
         BPF_TRAMP_MODIFY_RETURN,
         BPF_TRAMP_MAX,
         BPF_TRAMP_REPLACE, /* more than MAX */
 };
 
 struct bpf_tramp_image {
         void *image;
         int size;
         struct bpf_ksym ksym;
         struct percpu_ref pcref;
         void *ip_after_call;
         void *ip_epilogue;
         union {
                 struct rcu_head rcu;
                 struct work_struct work;
         };
 };
 
 struct bpf_trampoline {
         /* hlist for trampoline_table */
         struct hlist_node hlist;
         struct ftrace_ops *fops;
         /* serializes access to fields of this trampoline */
         struct mutex mutex;
         refcount_t refcnt;
         u32 flags;
         u64 key;
         struct {
                 struct btf_func_model model;
                 void *addr;
                 bool ftrace_managed;
         } func;
         /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
          * program by replacing one of its functions. func.addr is the address
          * of the function it replaced.
          */
         struct bpf_prog *extension_prog;
         /* list of BPF programs using this trampoline */
         struct hlist_head progs_hlist[BPF_TRAMP_MAX];
         /* Number of attached programs. A counter per kind. */
         int progs_cnt[BPF_TRAMP_MAX];
         /* Executable image of trampoline */
         struct bpf_tramp_image *cur_image;
 };
 
 struct bpf_attach_target_info {
         struct btf_func_model fmodel;
         long tgt_addr;
         struct module *tgt_mod;
         const char *tgt_name;
         const struct btf_type *tgt_type;
 };
 
 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
 
 struct bpf_dispatcher_prog {
         struct bpf_prog *prog;
         refcount_t users;
 };
 
 struct bpf_dispatcher {
         /* dispatcher mutex */
         struct mutex mutex;
         void *func;
         struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
         int num_progs;
         void *image;
         void *rw_image;
         u32 image_off;
         struct bpf_ksym ksym;
 #ifdef CONFIG_HAVE_STATIC_CALL
         struct static_call_key *sc_key;
         void *sc_tramp;
 #endif
 };
 
 #ifndef __bpfcall
 #define __bpfcall __nocfi
 #endif
 
 static __always_inline __bpfcall unsigned int bpf_dispatcher_nop_func(
         const void *ctx,
         const struct bpf_insn *insnsi,
         bpf_func_t bpf_func)
 {
         return bpf_func(ctx, insnsi);
 }
 
 /* the implementation of the opaque uapi struct bpf_dynptr */
 struct bpf_dynptr_kern {
         void *data;
         /* Size represents the number of usable bytes of dynptr data.
          * If for example the offset is at 4 for a local dynptr whose data is
          * of type u64, the number of usable bytes is 4.
          *
          * The upper 8 bits are reserved. It is as follows:
          * Bits 0 - 23 = size
          * Bits 24 - 30 = dynptr type
          * Bit 31 = whether dynptr is read-only
          */
         u32 size;
         u32 offset;
 } __aligned(8);
 
 enum bpf_dynptr_type {
         BPF_DYNPTR_TYPE_INVALID,
         /* Points to memory that is local to the bpf program */
         BPF_DYNPTR_TYPE_LOCAL,
         /* Underlying data is a ringbuf record */
         BPF_DYNPTR_TYPE_RINGBUF,
         /* Underlying data is a sk_buff */
         BPF_DYNPTR_TYPE_SKB,
         /* Underlying data is a xdp_buff */
         BPF_DYNPTR_TYPE_XDP,
 };
 
 int bpf_dynptr_check_size(u32 size);
 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
 const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
 void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);
 bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
 
 #ifdef CONFIG_BPF_JIT
 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
 struct bpf_trampoline *bpf_trampoline_get(u64 key,
                                           struct bpf_attach_target_info *tgt_info);
 void bpf_trampoline_put(struct bpf_trampoline *tr);
 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
 
 /*
  * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
  * indirection with a direct call to the bpf program. If the architecture does
  * not have STATIC_CALL, avoid a double-indirection.
  */
 #ifdef CONFIG_HAVE_STATIC_CALL
 
 #define __BPF_DISPATCHER_SC_INIT(_name)                         \
         .sc_key = &STATIC_CALL_KEY(_name),                      \
         .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
 
 #define __BPF_DISPATCHER_SC(name)                               \
         DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
 
 #define __BPF_DISPATCHER_CALL(name)                             \
         static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
 
 #define __BPF_DISPATCHER_UPDATE(_d, _new)                       \
         __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
 
 #else
 #define __BPF_DISPATCHER_SC_INIT(name)
 #define __BPF_DISPATCHER_SC(name)
 #define __BPF_DISPATCHER_CALL(name)             bpf_func(ctx, insnsi)
 #define __BPF_DISPATCHER_UPDATE(_d, _new)
 #endif
 
 #define BPF_DISPATCHER_INIT(_name) {                            \
         .mutex = __MUTEX_INITIALIZER(_name.mutex),              \
         .func = &_name##_func,                                  \
         .progs = {},                                            \
         .num_progs = 0,                                         \
         .image = NULL,                                          \
         .image_off = 0,                                         \
         .ksym = {                                               \
                 .name  = #_name,                                \
                 .lnode = LIST_HEAD_INIT(_name.ksym.lnode),      \
         },                                                      \
         __BPF_DISPATCHER_SC_INIT(_name##_call)                  \
 }
 
 #define DEFINE_BPF_DISPATCHER(name)                                     \
         __BPF_DISPATCHER_SC(name);                                      \
         noinline __bpfcall unsigned int bpf_dispatcher_##name##_func(   \
                 const void *ctx,                                        \
                 const struct bpf_insn *insnsi,                          \
                 bpf_func_t bpf_func)                                    \
         {                                                               \
                 return __BPF_DISPATCHER_CALL(name);                     \
         }                                                               \
         EXPORT_SYMBOL(bpf_dispatcher_##name##_func);                    \
         struct bpf_dispatcher bpf_dispatcher_##name =                   \
                 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
 
 #define DECLARE_BPF_DISPATCHER(name)                                    \
         unsigned int bpf_dispatcher_##name##_func(                      \
                 const void *ctx,                                        \
                 const struct bpf_insn *insnsi,                          \
                 bpf_func_t bpf_func);                                   \
         extern struct bpf_dispatcher bpf_dispatcher_##name;
 
 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
                                 struct bpf_prog *to);
 /* Called only from JIT-enabled code, so there's no need for stubs. */
 void bpf_image_ksym_add(void *data, unsigned int size, struct bpf_ksym *ksym);
 void bpf_image_ksym_del(struct bpf_ksym *ksym);
 void bpf_ksym_add(struct bpf_ksym *ksym);
 void bpf_ksym_del(struct bpf_ksym *ksym);
 int bpf_jit_charge_modmem(u32 size);
 void bpf_jit_uncharge_modmem(u32 size);
 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
 #else
 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
                                            struct bpf_trampoline *tr)
 {
         return -ENOTSUPP;
 }
 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
                                              struct bpf_trampoline *tr)
 {
         return -ENOTSUPP;
 }
 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
                                                         struct bpf_attach_target_info *tgt_info)
 {
         return NULL;
 }
 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
 #define DEFINE_BPF_DISPATCHER(name)
 #define DECLARE_BPF_DISPATCHER(name)
 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
 #define BPF_DISPATCHER_PTR(name) NULL
 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
                                               struct bpf_prog *from,
                                               struct bpf_prog *to) {}
 static inline bool is_bpf_image_address(unsigned long address)
 {
         return false;
 }
 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
 {
         return false;
 }
 #endif
 
 struct bpf_func_info_aux {
         u16 linkage;
         bool unreliable;
         bool called : 1;
         bool verified : 1;
 };
 
 enum bpf_jit_poke_reason {
         BPF_POKE_REASON_TAIL_CALL,
 };
 
 /* Descriptor of pokes pointing /into/ the JITed image. */
 struct bpf_jit_poke_descriptor {
         void *tailcall_target;
         void *tailcall_bypass;
         void *bypass_addr;
         void *aux;
         union {
                 struct {
                         struct bpf_map *map;
                         u32 key;
                 } tail_call;
         };
         bool tailcall_target_stable;
         u8 adj_off;
         u16 reason;
         u32 insn_idx;
 };
 
 /* reg_type info for ctx arguments */
 struct bpf_ctx_arg_aux {
         u32 offset;
         enum bpf_reg_type reg_type;
         struct btf *btf;
         u32 btf_id;
 };
 
 struct btf_mod_pair {
         struct btf *btf;
         struct module *module;
 };
 
 struct bpf_kfunc_desc_tab;
 
 struct bpf_prog_aux {
         atomic64_t refcnt;
         u32 used_map_cnt;
         u32 used_btf_cnt;
         u32 max_ctx_offset;
         u32 max_pkt_offset;
         u32 max_tp_access;
         u32 stack_depth;
         u32 id;
         u32 func_cnt; /* used by non-func prog as the number of func progs */
         u32 real_func_cnt; /* includes hidden progs, only used for JIT and freeing progs */
         u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
         u32 attach_btf_id; /* in-kernel BTF type id to attach to */
         u32 ctx_arg_info_size;
         u32 max_rdonly_access;
         u32 max_rdwr_access;
         struct btf *attach_btf;
         const struct bpf_ctx_arg_aux *ctx_arg_info;
         struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
         struct bpf_prog *dst_prog;
         struct bpf_trampoline *dst_trampoline;
         enum bpf_prog_type saved_dst_prog_type;
         enum bpf_attach_type saved_dst_attach_type;
         bool verifier_zext; /* Zero extensions has been inserted by verifier. */
         bool dev_bound; /* Program is bound to the netdev. */
         bool offload_requested; /* Program is bound and offloaded to the netdev. */
         bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
         bool attach_tracing_prog; /* true if tracing another tracing program */
         bool func_proto_unreliable;
         bool tail_call_reachable;
         bool xdp_has_frags;
         bool exception_cb;
         bool exception_boundary;
         struct bpf_arena *arena;
         /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
         const struct btf_type *attach_func_proto;
         /* function name for valid attach_btf_id */
         const char *attach_func_name;
         struct bpf_prog **func;
         void *jit_data; /* JIT specific data. arch dependent */
         struct bpf_jit_poke_descriptor *poke_tab;
         struct bpf_kfunc_desc_tab *kfunc_tab;
         struct bpf_kfunc_btf_tab *kfunc_btf_tab;
         u32 size_poke_tab;
 #ifdef CONFIG_FINEIBT
         struct bpf_ksym ksym_prefix;
 #endif
         struct bpf_ksym ksym;
         const struct bpf_prog_ops *ops;
         struct bpf_map **used_maps;
         struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
         struct btf_mod_pair *used_btfs;
         struct bpf_prog *prog;
         struct user_struct *user;
         u64 load_time; /* ns since boottime */
         u32 verified_insns;
         int cgroup_atype; /* enum cgroup_bpf_attach_type */
         struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
         char name[BPF_OBJ_NAME_LEN];
         u64 (*bpf_exception_cb)(u64 cookie, u64 sp, u64 bp, u64, u64);
 #ifdef CONFIG_SECURITY
         void *security;
 #endif
         struct bpf_token *token;
         struct bpf_prog_offload *offload;
         struct btf *btf;
         struct bpf_func_info *func_info;
         struct bpf_func_info_aux *func_info_aux;
         /* bpf_line_info loaded from userspace.  linfo->insn_off
          * has the xlated insn offset.
          * Both the main and sub prog share the same linfo.
          * The subprog can access its first linfo by
          * using the linfo_idx.
          */
         struct bpf_line_info *linfo;
         /* jited_linfo is the jited addr of the linfo.  It has a
          * one to one mapping to linfo:
          * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
          * Both the main and sub prog share the same jited_linfo.
          * The subprog can access its first jited_linfo by
          * using the linfo_idx.
          */
         void **jited_linfo;
         u32 func_info_cnt;
         u32 nr_linfo;
         /* subprog can use linfo_idx to access its first linfo and
          * jited_linfo.
          * main prog always has linfo_idx == 0
          */
         u32 linfo_idx;
         struct module *mod;
         u32 num_exentries;
         struct exception_table_entry *extable;
         union {
                 struct work_struct work;
                 struct rcu_head rcu;
         };
 };
 
 struct bpf_prog {
         u16                     pages;          /* Number of allocated pages */
         u16                     jited:1,        /* Is our filter JIT'ed? */
                                 jit_requested:1,/* archs need to JIT the prog */
                                 gpl_compatible:1, /* Is filter GPL compatible? */
                                 cb_access:1,    /* Is control block accessed? */
                                 dst_needed:1,   /* Do we need dst entry? */
                                 blinding_requested:1, /* needs constant blinding */
                                 blinded:1,      /* Was blinded */
                                 is_func:1,      /* program is a bpf function */
                                 kprobe_override:1, /* Do we override a kprobe? */
                                 has_callchain_buf:1, /* callchain buffer allocated? */
                                 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
                                 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
                                 call_get_func_ip:1, /* Do we call get_func_ip() */
                                 tstamp_type_access:1, /* Accessed __sk_buff->tstamp_type */
                                 sleepable:1;    /* BPF program is sleepable */
         enum bpf_prog_type      type;           /* Type of BPF program */
         enum bpf_attach_type    expected_attach_type; /* For some prog types */
         u32                     len;            /* Number of filter blocks */
         u32                     jited_len;      /* Size of jited insns in bytes */
         u8                      tag[BPF_TAG_SIZE];
         struct bpf_prog_stats __percpu *stats;
         int __percpu            *active;
         unsigned int            (*bpf_func)(const void *ctx,
                                             const struct bpf_insn *insn);
         struct bpf_prog_aux     *aux;           /* Auxiliary fields */
         struct sock_fprog_kern  *orig_prog;     /* Original BPF program */
         /* Instructions for interpreter */
         union {
                 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
                 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
         };
 };
 
 struct bpf_array_aux {
         /* Programs with direct jumps into programs part of this array. */
         struct list_head poke_progs;
         struct bpf_map *map;
         struct mutex poke_mutex;
         struct work_struct work;
 };
 
 struct bpf_link {
         atomic64_t refcnt;
         u32 id;
         enum bpf_link_type type;
         const struct bpf_link_ops *ops;
         struct bpf_prog *prog;
         /* rcu is used before freeing, work can be used to schedule that
          * RCU-based freeing before that, so they never overlap
          */
         union {
                 struct rcu_head rcu;
                 struct work_struct work;
         };
 };
 
 struct bpf_link_ops {
         void (*release)(struct bpf_link *link);
         /* deallocate link resources callback, called without RCU grace period
          * waiting
          */
         void (*dealloc)(struct bpf_link *link);
         /* deallocate link resources callback, called after RCU grace period;
          * if underlying BPF program is sleepable we go through tasks trace
          * RCU GP and then "classic" RCU GP
          */
         void (*dealloc_deferred)(struct bpf_link *link);
         int (*detach)(struct bpf_link *link);
         int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
                            struct bpf_prog *old_prog);
         void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
         int (*fill_link_info)(const struct bpf_link *link,
                               struct bpf_link_info *info);
         int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
                           struct bpf_map *old_map);
         __poll_t (*poll)(struct file *file, struct poll_table_struct *pts);
 };
 
 struct bpf_tramp_link {
         struct bpf_link link;
         struct hlist_node tramp_hlist;
         u64 cookie;
 };
 
 struct bpf_shim_tramp_link {
         struct bpf_tramp_link link;
         struct bpf_trampoline *trampoline;
 };
 
 struct bpf_tracing_link {
         struct bpf_tramp_link link;
         enum bpf_attach_type attach_type;
         struct bpf_trampoline *trampoline;
         struct bpf_prog *tgt_prog;
 };
 
 struct bpf_raw_tp_link {
         struct bpf_link link;
         struct bpf_raw_event_map *btp;
         u64 cookie;
 };
 
 struct bpf_link_primer {
         struct bpf_link *link;
         struct file *file;
         int fd;
         u32 id;
 };
 
 struct bpf_mount_opts {
         kuid_t uid;
         kgid_t gid;
         umode_t mode;
 
         /* BPF token-related delegation options */
         u64 delegate_cmds;
         u64 delegate_maps;
         u64 delegate_progs;
         u64 delegate_attachs;
 };
 
 struct bpf_token {
         struct work_struct work;
         atomic64_t refcnt;
         struct user_namespace *userns;
         u64 allowed_cmds;
         u64 allowed_maps;
         u64 allowed_progs;
         u64 allowed_attachs;
 #ifdef CONFIG_SECURITY
         void *security;
 #endif
 };
 
 struct bpf_struct_ops_value;
 struct btf_member;
 
 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
 /**
  * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
  *                         define a BPF_MAP_TYPE_STRUCT_OPS map type composed
  *                         of BPF_PROG_TYPE_STRUCT_OPS progs.
  * @verifier_ops: A structure of callbacks that are invoked by the verifier
  *                when determining whether the struct_ops progs in the
  *                struct_ops map are valid.
  * @init: A callback that is invoked a single time, and before any other
  *        callback, to initialize the structure. A nonzero return value means
  *        the subsystem could not be initialized.
  * @check_member: When defined, a callback invoked by the verifier to allow
  *                the subsystem to determine if an entry in the struct_ops map
  *                is valid. A nonzero return value means that the map is
  *                invalid and should be rejected by the verifier.
  * @init_member: A callback that is invoked for each member of the struct_ops
  *               map to allow the subsystem to initialize the member. A nonzero
  *               value means the member could not be initialized. This callback
  *               is exclusive with the @type, @type_id, @value_type, and
  *               @value_id fields.
  * @reg: A callback that is invoked when the struct_ops map has been
  *       initialized and is being attached to. Zero means the struct_ops map
  *       has been successfully registered and is live. A nonzero return value
  *       means the struct_ops map could not be registered.
  * @unreg: A callback that is invoked when the struct_ops map should be
  *         unregistered.
  * @update: A callback that is invoked when the live struct_ops map is being
  *          updated to contain new values. This callback is only invoked when
  *          the struct_ops map is loaded with BPF_F_LINK. If not defined, the
  *          it is assumed that the struct_ops map cannot be updated.
  * @validate: A callback that is invoked after all of the members have been
  *            initialized. This callback should perform static checks on the
  *            map, meaning that it should either fail or succeed
  *            deterministically. A struct_ops map that has been validated may
  *            not necessarily succeed in being registered if the call to @reg
  *            fails. For example, a valid struct_ops map may be loaded, but
  *            then fail to be registered due to there being another active
  *            struct_ops map on the system in the subsystem already. For this
  *            reason, if this callback is not defined, the check is skipped as
  *            the struct_ops map will have final verification performed in
  *            @reg.
  * @type: BTF type.
  * @value_type: Value type.
  * @name: The name of the struct bpf_struct_ops object.
  * @func_models: Func models
  * @type_id: BTF type id.
  * @value_id: BTF value id.
  */
 struct bpf_struct_ops {
         const struct bpf_verifier_ops *verifier_ops;
         int (*init)(struct btf *btf);
         int (*check_member)(const struct btf_type *t,
                             const struct btf_member *member,
                             const struct bpf_prog *prog);
         int (*init_member)(const struct btf_type *t,
                            const struct btf_member *member,
                            void *kdata, const void *udata);
         int (*reg)(void *kdata, struct bpf_link *link);
         void (*unreg)(void *kdata, struct bpf_link *link);
         int (*update)(void *kdata, void *old_kdata, struct bpf_link *link);
         int (*validate)(void *kdata);
         void *cfi_stubs;
         struct module *owner;
         const char *name;
         struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
 };
 
 /* Every member of a struct_ops type has an instance even a member is not
  * an operator (function pointer). The "info" field will be assigned to
  * prog->aux->ctx_arg_info of BPF struct_ops programs to provide the
  * argument information required by the verifier to verify the program.
  *
  * btf_ctx_access() will lookup prog->aux->ctx_arg_info to find the
  * corresponding entry for an given argument.
  */
 struct bpf_struct_ops_arg_info {
         struct bpf_ctx_arg_aux *info;
         u32 cnt;
 };
 
 struct bpf_struct_ops_desc {
         struct bpf_struct_ops *st_ops;
 
         const struct btf_type *type;
         const struct btf_type *value_type;
         u32 type_id;
         u32 value_id;
 
         /* Collection of argument information for each member */
         struct bpf_struct_ops_arg_info *arg_info;
 };
 
 enum bpf_struct_ops_state {
         BPF_STRUCT_OPS_STATE_INIT,
         BPF_STRUCT_OPS_STATE_INUSE,
         BPF_STRUCT_OPS_STATE_TOBEFREE,
         BPF_STRUCT_OPS_STATE_READY,
 };
 
 struct bpf_struct_ops_common_value {
         refcount_t refcnt;
         enum bpf_struct_ops_state state;
 };
 
 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
 /* This macro helps developer to register a struct_ops type and generate
  * type information correctly. Developers should use this macro to register
  * a struct_ops type instead of calling __register_bpf_struct_ops() directly.
  */
 #define register_bpf_struct_ops(st_ops, type)                           \
         ({                                                              \
                 struct bpf_struct_ops_##type {                          \
                         struct bpf_struct_ops_common_value common;      \
                         struct type data ____cacheline_aligned_in_smp;  \
                 };                                                      \
                 BTF_TYPE_EMIT(struct bpf_struct_ops_##type);            \
                 __register_bpf_struct_ops(st_ops);                      \
         })
 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
 bool bpf_struct_ops_get(const void *kdata);
 void bpf_struct_ops_put(const void *kdata);
 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
                                        void *value);
 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
                                       struct bpf_tramp_link *link,
                                       const struct btf_func_model *model,
                                       void *stub_func,
                                       void **image, u32 *image_off,
                                       bool allow_alloc);
 void bpf_struct_ops_image_free(void *image);
 static inline bool bpf_try_module_get(const void *data, struct module *owner)
 {
         if (owner == BPF_MODULE_OWNER)
                 return bpf_struct_ops_get(data);
         else
                 return try_module_get(owner);
 }
 static inline void bpf_module_put(const void *data, struct module *owner)
 {
         if (owner == BPF_MODULE_OWNER)
                 bpf_struct_ops_put(data);
         else
                 module_put(owner);
 }
 int bpf_struct_ops_link_create(union bpf_attr *attr);
 
 #ifdef CONFIG_NET
 /* Define it here to avoid the use of forward declaration */
 struct bpf_dummy_ops_state {
         int val;
 };
 
 struct bpf_dummy_ops {
         int (*test_1)(struct bpf_dummy_ops_state *cb);
         int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
                       char a3, unsigned long a4);
         int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
 };
 
 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
                             union bpf_attr __user *uattr);
 #endif
 int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc *st_ops_desc,
                              struct btf *btf,
                              struct bpf_verifier_log *log);
 void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map);
 void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc);
 #else
 #define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
 static inline bool bpf_try_module_get(const void *data, struct module *owner)
 {
         return try_module_get(owner);
 }
 static inline void bpf_module_put(const void *data, struct module *owner)
 {
         module_put(owner);
 }
 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
                                                      void *key,
                                                      void *value)
 {
         return -EINVAL;
 }
 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
 {
         return -EOPNOTSUPP;
 }
 static inline void bpf_map_struct_ops_info_fill(struct bpf_map_info *info, struct bpf_map *map)
 {
 }
 
 static inline void bpf_struct_ops_desc_release(struct bpf_struct_ops_desc *st_ops_desc)
 {
 }
 
 #endif
 
 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
                                     int cgroup_atype);
 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
 #else
 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
                                                   int cgroup_atype)
 {
         return -EOPNOTSUPP;
 }
 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
 {
 }
 #endif
 
 struct bpf_array {
         struct bpf_map map;
         u32 elem_size;
         u32 index_mask;
         struct bpf_array_aux *aux;
         union {
                 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
                 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
                 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
         };
 };
 
 #define BPF_COMPLEXITY_LIMIT_INSNS      1000000 /* yes. 1M insns */
 #define MAX_TAIL_CALL_CNT 33
 
 /* Maximum number of loops for bpf_loop and bpf_iter_num.
  * It's enum to expose it (and thus make it discoverable) through BTF.
  */
 enum {
         BPF_MAX_LOOPS = 8 * 1024 * 1024,
 };
 
 #define BPF_F_ACCESS_MASK       (BPF_F_RDONLY |         \
                                  BPF_F_RDONLY_PROG |    \
                                  BPF_F_WRONLY |         \
                                  BPF_F_WRONLY_PROG)
 
 #define BPF_MAP_CAN_READ        BIT(0)
 #define BPF_MAP_CAN_WRITE       BIT(1)
 
 /* Maximum number of user-producer ring buffer samples that can be drained in
  * a call to bpf_user_ringbuf_drain().
  */
 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
 
 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
 {
         u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
 
         /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
          * not possible.
          */
         if (access_flags & BPF_F_RDONLY_PROG)
                 return BPF_MAP_CAN_READ;
         else if (access_flags & BPF_F_WRONLY_PROG)
                 return BPF_MAP_CAN_WRITE;
         else
                 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
 }
 
 static inline bool bpf_map_flags_access_ok(u32 access_flags)
 {
         return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
                (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
 }
 
 struct bpf_event_entry {
         struct perf_event *event;
         struct file *perf_file;
         struct file *map_file;
         struct rcu_head rcu;
 };
 
 static inline bool map_type_contains_progs(struct bpf_map *map)
 {
         return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
                map->map_type == BPF_MAP_TYPE_DEVMAP ||
                map->map_type == BPF_MAP_TYPE_CPUMAP;
 }
 
 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
 int bpf_prog_calc_tag(struct bpf_prog *fp);
 
 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
 
 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
                                         unsigned long off, unsigned long len);
 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
                                         const struct bpf_insn *src,
                                         struct bpf_insn *dst,
                                         struct bpf_prog *prog,
                                         u32 *target_size);
 
 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
                      void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
 
 /* an array of programs to be executed under rcu_lock.
  *
  * Typical usage:
  * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
  *
  * the structure returned by bpf_prog_array_alloc() should be populated
  * with program pointers and the last pointer must be NULL.
  * The user has to keep refcnt on the program and make sure the program
  * is removed from the array before bpf_prog_put().
  * The 'struct bpf_prog_array *' should only be replaced with xchg()
  * since other cpus are walking the array of pointers in parallel.
  */
 struct bpf_prog_array_item {
         struct bpf_prog *prog;
         union {
                 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
                 u64 bpf_cookie;
         };
 };
 
 struct bpf_prog_array {
         struct rcu_head rcu;
         struct bpf_prog_array_item items[];
 };
 
 struct bpf_empty_prog_array {
         struct bpf_prog_array hdr;
         struct bpf_prog *null_prog;
 };
 
 /* to avoid allocating empty bpf_prog_array for cgroups that
  * don't have bpf program attached use one global 'bpf_empty_prog_array'
  * It will not be modified the caller of bpf_prog_array_alloc()
  * (since caller requested prog_cnt == 0)
  * that pointer should be 'freed' by bpf_prog_array_free()
  */
 extern struct bpf_empty_prog_array bpf_empty_prog_array;
 
 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
 void bpf_prog_array_free(struct bpf_prog_array *progs);
 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
 int bpf_prog_array_length(struct bpf_prog_array *progs);
 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
                                 __u32 __user *prog_ids, u32 cnt);
 
 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
                                 struct bpf_prog *old_prog);
 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
                              struct bpf_prog *prog);
 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
                              u32 *prog_ids, u32 request_cnt,
                              u32 *prog_cnt);
 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
                         struct bpf_prog *exclude_prog,
                         struct bpf_prog *include_prog,
                         u64 bpf_cookie,
                         struct bpf_prog_array **new_array);
 
 struct bpf_run_ctx {};
 
 struct bpf_cg_run_ctx {
         struct bpf_run_ctx run_ctx;
         const struct bpf_prog_array_item *prog_item;
         int retval;
 };
 
 struct bpf_trace_run_ctx {
         struct bpf_run_ctx run_ctx;
         u64 bpf_cookie;
         bool is_uprobe;
 };
 
 struct bpf_tramp_run_ctx {
         struct bpf_run_ctx run_ctx;
         u64 bpf_cookie;
         struct bpf_run_ctx *saved_run_ctx;
 };
 
 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
 {
         struct bpf_run_ctx *old_ctx = NULL;
 
 #ifdef CONFIG_BPF_SYSCALL
         old_ctx = current->bpf_ctx;
         current->bpf_ctx = new_ctx;
 #endif
         return old_ctx;
 }
 
 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
 {
 #ifdef CONFIG_BPF_SYSCALL
         current->bpf_ctx = old_ctx;
 #endif
 }
 
 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE                    (1 << 0)
 /* BPF program asks to set CN on the packet. */
 #define BPF_RET_SET_CN                                          (1 << 0)
 
 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
 
 static __always_inline u32
 bpf_prog_run_array(const struct bpf_prog_array *array,
                    const void *ctx, bpf_prog_run_fn run_prog)
 {
         const struct bpf_prog_array_item *item;
         const struct bpf_prog *prog;
         struct bpf_run_ctx *old_run_ctx;
         struct bpf_trace_run_ctx run_ctx;
         u32 ret = 1;
 
         RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
 
         if (unlikely(!array))
                 return ret;
 
         run_ctx.is_uprobe = false;
 
         migrate_disable();
         old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
         item = &array->items[0];
         while ((prog = READ_ONCE(item->prog))) {
                 run_ctx.bpf_cookie = item->bpf_cookie;
                 ret &= run_prog(prog, ctx);
                 item++;
         }
         bpf_reset_run_ctx(old_run_ctx);
         migrate_enable();
         return ret;
 }
 
 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
  *
  * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
  * overall. As a result, we must use the bpf_prog_array_free_sleepable
  * in order to use the tasks_trace rcu grace period.
  *
  * When a non-sleepable program is inside the array, we take the rcu read
  * section and disable preemption for that program alone, so it can access
  * rcu-protected dynamically sized maps.
  */
 static __always_inline u32
 bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu *array_rcu,
                           const void *ctx, bpf_prog_run_fn run_prog)
 {
         const struct bpf_prog_array_item *item;
         const struct bpf_prog *prog;
         const struct bpf_prog_array *array;
         struct bpf_run_ctx *old_run_ctx;
         struct bpf_trace_run_ctx run_ctx;
         u32 ret = 1;
 
         might_fault();
 
         rcu_read_lock_trace();
         migrate_disable();
 
         run_ctx.is_uprobe = true;
 
         array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held());
         if (unlikely(!array))
                 goto out;
         old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
         item = &array->items[0];
         while ((prog = READ_ONCE(item->prog))) {
                 if (!prog->sleepable)
                         rcu_read_lock();
 
                 run_ctx.bpf_cookie = item->bpf_cookie;
                 ret &= run_prog(prog, ctx);
                 item++;
 
                 if (!prog->sleepable)
                         rcu_read_unlock();
         }
         bpf_reset_run_ctx(old_run_ctx);
 out:
         migrate_enable();
         rcu_read_unlock_trace();
         return ret;
 }
 
 #ifdef CONFIG_BPF_SYSCALL
 DECLARE_PER_CPU(int, bpf_prog_active);
 extern struct mutex bpf_stats_enabled_mutex;
 
 /*
  * Block execution of BPF programs attached to instrumentation (perf,
  * kprobes, tracepoints) to prevent deadlocks on map operations as any of
  * these events can happen inside a region which holds a map bucket lock
  * and can deadlock on it.
  */
 static inline void bpf_disable_instrumentation(void)
 {
         migrate_disable();
         this_cpu_inc(bpf_prog_active);
 }
 
 static inline void bpf_enable_instrumentation(void)
 {
         this_cpu_dec(bpf_prog_active);
         migrate_enable();
 }
 
 extern const struct super_operations bpf_super_ops;
 extern const struct file_operations bpf_map_fops;
 extern const struct file_operations bpf_prog_fops;
 extern const struct file_operations bpf_iter_fops;
 
 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
         extern const struct bpf_prog_ops _name ## _prog_ops; \
         extern const struct bpf_verifier_ops _name ## _verifier_ops;
 #define BPF_MAP_TYPE(_id, _ops) \
         extern const struct bpf_map_ops _ops;
 #define BPF_LINK_TYPE(_id, _name)
 #include <linux/bpf_types.h>
 #undef BPF_PROG_TYPE
 #undef BPF_MAP_TYPE
 #undef BPF_LINK_TYPE
 
 extern const struct bpf_prog_ops bpf_offload_prog_ops;
 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
 extern const struct bpf_verifier_ops xdp_analyzer_ops;
 
 struct bpf_prog *bpf_prog_get(u32 ufd);
 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
                                        bool attach_drv);
 void bpf_prog_add(struct bpf_prog *prog, int i);
 void bpf_prog_sub(struct bpf_prog *prog, int i);
 void bpf_prog_inc(struct bpf_prog *prog);
 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
 void bpf_prog_put(struct bpf_prog *prog);
 
 void bpf_prog_free_id(struct bpf_prog *prog);
 void bpf_map_free_id(struct bpf_map *map);
 
 struct btf_field *btf_record_find(const struct btf_record *rec,
                                   u32 offset, u32 field_mask);
 void btf_record_free(struct btf_record *rec);
 void bpf_map_free_record(struct bpf_map *map);
 struct btf_record *btf_record_dup(const struct btf_record *rec);
 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
 void bpf_obj_free_workqueue(const struct btf_record *rec, void *obj);
 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
 void __bpf_obj_drop_impl(void *p, const struct btf_record *rec, bool percpu);
 
 struct bpf_map *bpf_map_get(u32 ufd);
 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
 struct bpf_map *__bpf_map_get(struct fd f);
 void bpf_map_inc(struct bpf_map *map);
 void bpf_map_inc_with_uref(struct bpf_map *map);
 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
 void bpf_map_put_with_uref(struct bpf_map *map);
 void bpf_map_put(struct bpf_map *map);
 void *bpf_map_area_alloc(u64 size, int numa_node);
 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
 void bpf_map_area_free(void *base);
 bool bpf_map_write_active(const struct bpf_map *map);
 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
 int  generic_map_lookup_batch(struct bpf_map *map,
                               const union bpf_attr *attr,
                               union bpf_attr __user *uattr);
 int  generic_map_update_batch(struct bpf_map *map, struct file *map_file,
                               const union bpf_attr *attr,
                               union bpf_attr __user *uattr);
 int  generic_map_delete_batch(struct bpf_map *map,
                               const union bpf_attr *attr,
                               union bpf_attr __user *uattr);
 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
 
 int bpf_map_alloc_pages(const struct bpf_map *map, gfp_t gfp, int nid,
                         unsigned long nr_pages, struct page **page_array);
 #ifdef CONFIG_MEMCG
 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
                            int node);
 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
                        gfp_t flags);
 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
                                     size_t align, gfp_t flags);
 #else
 /*
  * These specialized allocators have to be macros for their allocations to be
  * accounted separately (to have separate alloc_tag).
  */
 #define bpf_map_kmalloc_node(_map, _size, _flags, _node)        \
                 kmalloc_node(_size, _flags, _node)
 #define bpf_map_kzalloc(_map, _size, _flags)                    \
                 kzalloc(_size, _flags)
 #define bpf_map_kvcalloc(_map, _n, _size, _flags)               \
                 kvcalloc(_n, _size, _flags)
 #define bpf_map_alloc_percpu(_map, _size, _align, _flags)       \
                 __alloc_percpu_gfp(_size, _align, _flags)
 #endif
 
 static inline int
 bpf_map_init_elem_count(struct bpf_map *map)
 {
         size_t size = sizeof(*map->elem_count), align = size;
         gfp_t flags = GFP_USER | __GFP_NOWARN;
 
         map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
         if (!map->elem_count)
                 return -ENOMEM;
 
         return 0;
 }
 
 static inline void
 bpf_map_free_elem_count(struct bpf_map *map)
 {
         free_percpu(map->elem_count);
 }
 
 static inline void bpf_map_inc_elem_count(struct bpf_map *map)
 {
         this_cpu_inc(*map->elem_count);
 }
 
 static inline void bpf_map_dec_elem_count(struct bpf_map *map)
 {
         this_cpu_dec(*map->elem_count);
 }
 
 extern int sysctl_unprivileged_bpf_disabled;
 
 bool bpf_token_capable(const struct bpf_token *token, int cap);
 
 static inline bool bpf_allow_ptr_leaks(const struct bpf_token *token)
 {
         return bpf_token_capable(token, CAP_PERFMON);
 }
 
 static inline bool bpf_allow_uninit_stack(const struct bpf_token *token)
 {
         return bpf_token_capable(token, CAP_PERFMON);
 }
 
 static inline bool bpf_bypass_spec_v1(const struct bpf_token *token)
 {
         return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);
 }
 
 static inline bool bpf_bypass_spec_v4(const struct bpf_token *token)
 {
         return cpu_mitigations_off() || bpf_token_capable(token, CAP_PERFMON);
 }
 
 int bpf_map_new_fd(struct bpf_map *map, int flags);
 int bpf_prog_new_fd(struct bpf_prog *prog);
 
 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
                    const struct bpf_link_ops *ops, struct bpf_prog *prog);
 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
 int bpf_link_settle(struct bpf_link_primer *primer);
 void bpf_link_cleanup(struct bpf_link_primer *primer);
 void bpf_link_inc(struct bpf_link *link);
 struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);
 void bpf_link_put(struct bpf_link *link);
 int bpf_link_new_fd(struct bpf_link *link);
 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
 
 void bpf_token_inc(struct bpf_token *token);
 void bpf_token_put(struct bpf_token *token);
 int bpf_token_create(union bpf_attr *attr);
 struct bpf_token *bpf_token_get_from_fd(u32 ufd);
 
 bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd);
 bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type);
 bool bpf_token_allow_prog_type(const struct bpf_token *token,
                                enum bpf_prog_type prog_type,
                                enum bpf_attach_type attach_type);
 
 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
 struct inode *bpf_get_inode(struct super_block *sb, const struct inode *dir,
                             umode_t mode);
 
 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
 #define DEFINE_BPF_ITER_FUNC(target, args...)                   \
         extern int bpf_iter_ ## target(args);                   \
         int __init bpf_iter_ ## target(args) { return 0; }
 
 /*
  * The task type of iterators.
  *
  * For BPF task iterators, they can be parameterized with various
  * parameters to visit only some of tasks.
  *
  * BPF_TASK_ITER_ALL (default)
  *      Iterate over resources of every task.
  *
  * BPF_TASK_ITER_TID
  *      Iterate over resources of a task/tid.
  *
  * BPF_TASK_ITER_TGID
  *      Iterate over resources of every task of a process / task group.
  */
 enum bpf_iter_task_type {
         BPF_TASK_ITER_ALL = 0,
         BPF_TASK_ITER_TID,
         BPF_TASK_ITER_TGID,
 };
 
 struct bpf_iter_aux_info {
         /* for map_elem iter */
         struct bpf_map *map;
 
         /* for cgroup iter */
         struct {
                 struct cgroup *start; /* starting cgroup */
                 enum bpf_cgroup_iter_order order;
         } cgroup;
         struct {
                 enum bpf_iter_task_type type;
                 u32 pid;
         } task;
 };
 
 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
                                         union bpf_iter_link_info *linfo,
                                         struct bpf_iter_aux_info *aux);
 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
                                         struct seq_file *seq);
 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
                                          struct bpf_link_info *info);
 typedef const struct bpf_func_proto *
 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
                              const struct bpf_prog *prog);
 
 enum bpf_iter_feature {
         BPF_ITER_RESCHED        = BIT(0),
 };
 
 #define BPF_ITER_CTX_ARG_MAX 2
 struct bpf_iter_reg {
         const char *target;
         bpf_iter_attach_target_t attach_target;
         bpf_iter_detach_target_t detach_target;
         bpf_iter_show_fdinfo_t show_fdinfo;
         bpf_iter_fill_link_info_t fill_link_info;
         bpf_iter_get_func_proto_t get_func_proto;
         u32 ctx_arg_info_size;
         u32 feature;
         struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
         const struct bpf_iter_seq_info *seq_info;
 };
 
 struct bpf_iter_meta {
         __bpf_md_ptr(struct seq_file *, seq);
         u64 session_id;
         u64 seq_num;
 };
 
 struct bpf_iter__bpf_map_elem {
         __bpf_md_ptr(struct bpf_iter_meta *, meta);
         __bpf_md_ptr(struct bpf_map *, map);
         __bpf_md_ptr(void *, key);
         __bpf_md_ptr(void *, value);
 };
 
 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
 bool bpf_iter_prog_supported(struct bpf_prog *prog);
 const struct bpf_func_proto *
 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
 int bpf_iter_new_fd(struct bpf_link *link);
 bool bpf_link_is_iter(struct bpf_link *link);
 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
                               struct seq_file *seq);
 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
                                 struct bpf_link_info *info);
 
 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
                                    struct bpf_func_state *caller,
                                    struct bpf_func_state *callee);
 
 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
                            u64 flags);
 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
                             u64 flags);
 
 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
 
 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
                                  void *key, void *value, u64 map_flags);
 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
                                 void *key, void *value, u64 map_flags);
 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
 
 int bpf_get_file_flag(int flags);
 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
                              size_t actual_size);
 
 /* verify correctness of eBPF program */
 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
 
 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
 #endif
 
 struct btf *bpf_get_btf_vmlinux(void);
 
 /* Map specifics */
 struct xdp_frame;
 struct sk_buff;
 struct bpf_dtab_netdev;
 struct bpf_cpu_map_entry;
 
 void __dev_flush(struct list_head *flush_list);
 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
                     struct net_device *dev_rx);
 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
                     struct net_device *dev_rx);
 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
                           struct bpf_map *map, bool exclude_ingress);
 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
                              struct bpf_prog *xdp_prog);
 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
                            struct bpf_prog *xdp_prog, struct bpf_map *map,
                            bool exclude_ingress);
 
 void __cpu_map_flush(struct list_head *flush_list);
 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
                     struct net_device *dev_rx);
 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
                              struct sk_buff *skb);
 
 /* Return map's numa specified by userspace */
 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
 {
         return (attr->map_flags & BPF_F_NUMA_NODE) ?
                 attr->numa_node : NUMA_NO_NODE;
 }
 
 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
 int array_map_alloc_check(union bpf_attr *attr);
 
 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
                           union bpf_attr __user *uattr);
 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
                           union bpf_attr __user *uattr);
 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
                               const union bpf_attr *kattr,
                               union bpf_attr __user *uattr);
 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
                                      const union bpf_attr *kattr,
                                      union bpf_attr __user *uattr);
 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
                              const union bpf_attr *kattr,
                              union bpf_attr __user *uattr);
 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
                                 const union bpf_attr *kattr,
                                 union bpf_attr __user *uattr);
 int bpf_prog_test_run_nf(struct bpf_prog *prog,
                          const union bpf_attr *kattr,
                          union bpf_attr __user *uattr);
 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
                     const struct bpf_prog *prog,
                     struct bpf_insn_access_aux *info);
 
 static inline bool bpf_tracing_ctx_access(int off, int size,
                                           enum bpf_access_type type)
 {
         if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
                 return false;
         if (type != BPF_READ)
                 return false;
         if (off % size != 0)
                 return false;
         return true;
 }
 
 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
                                               enum bpf_access_type type,
                                               const struct bpf_prog *prog,
                                               struct bpf_insn_access_aux *info)
 {
         if (!bpf_tracing_ctx_access(off, size, type))
                 return false;
         return btf_ctx_access(off, size, type, prog, info);
 }
 
 int btf_struct_access(struct bpf_verifier_log *log,
                       const struct bpf_reg_state *reg,
                       int off, int size, enum bpf_access_type atype,
                       u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
 bool btf_struct_ids_match(struct bpf_verifier_log *log,
                           const struct btf *btf, u32 id, int off,
                           const struct btf *need_btf, u32 need_type_id,
                           bool strict);
 
 int btf_distill_func_proto(struct bpf_verifier_log *log,
                            struct btf *btf,
                            const struct btf_type *func_proto,
                            const char *func_name,
                            struct btf_func_model *m);
 
 struct bpf_reg_state;
 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog);
 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
                          struct btf *btf, const struct btf_type *t);
 const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,
                                     int comp_idx, const char *tag_key);
 int btf_find_next_decl_tag(const struct btf *btf, const struct btf_type *pt,
                            int comp_idx, const char *tag_key, int last_id);
 
 struct bpf_prog *bpf_prog_by_id(u32 id);
 struct bpf_link *bpf_link_by_id(u32 id);
 
 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id,
                                                  const struct bpf_prog *prog);
 void bpf_task_storage_free(struct task_struct *task);
 void bpf_cgrp_storage_free(struct cgroup *cgroup);
 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
 const struct btf_func_model *
 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
                          const struct bpf_insn *insn);
 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
                        u16 btf_fd_idx, u8 **func_addr);
 
 struct bpf_core_ctx {
         struct bpf_verifier_log *log;
         const struct btf *btf;
 };
 
 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
                                 const struct bpf_reg_state *reg,
                                 const char *field_name, u32 btf_id, const char *suffix);
 
 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
                                const struct btf *reg_btf, u32 reg_id,
                                const struct btf *arg_btf, u32 arg_id);
 
 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
                    int relo_idx, void *insn);
 
 static inline bool unprivileged_ebpf_enabled(void)
 {
         return !sysctl_unprivileged_bpf_disabled;
 }
 
 /* Not all bpf prog type has the bpf_ctx.
  * For the bpf prog type that has initialized the bpf_ctx,
  * this function can be used to decide if a kernel function
  * is called by a bpf program.
  */
 static inline bool has_current_bpf_ctx(void)
 {
         return !!current->bpf_ctx;
 }
 
 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
 
 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
                      enum bpf_dynptr_type type, u32 offset, u32 size);
 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
 
 #else /* !CONFIG_BPF_SYSCALL */
 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
 {
         return ERR_PTR(-EOPNOTSUPP);
 }
 
 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
                                                      enum bpf_prog_type type,
                                                      bool attach_drv)
 {
         return ERR_PTR(-EOPNOTSUPP);
 }
 
 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
 {
 }
 
 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
 {
 }
 
 static inline void bpf_prog_put(struct bpf_prog *prog)
 {
 }
 
 static inline void bpf_prog_inc(struct bpf_prog *prog)
 {
 }
 
 static inline struct bpf_prog *__must_check
 bpf_prog_inc_not_zero(struct bpf_prog *prog)
 {
         return ERR_PTR(-EOPNOTSUPP);
 }
 
 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
                                  const struct bpf_link_ops *ops,
                                  struct bpf_prog *prog)
 {
 }
 
 static inline int bpf_link_prime(struct bpf_link *link,
                                  struct bpf_link_primer *primer)
 {
         return -EOPNOTSUPP;
 }
 
 static inline int bpf_link_settle(struct bpf_link_primer *primer)
 {
         return -EOPNOTSUPP;
 }
 
 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
 {
 }
 
 static inline void bpf_link_inc(struct bpf_link *link)
 {
 }
 
 static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
 {
         return NULL;
 }
 
 static inline void bpf_link_put(struct bpf_link *link)
 {
 }
 
 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
 {
         return -EOPNOTSUPP;
 }
 
 static inline bool bpf_token_capable(const struct bpf_token *token, int cap)
 {
         return capable(cap) || (cap != CAP_SYS_ADMIN && capable(CAP_SYS_ADMIN));
 }
 
 static inline void bpf_token_inc(struct bpf_token *token)
 {
 }
 
 static inline void bpf_token_put(struct bpf_token *token)
 {
 }
 
 static inline struct bpf_token *bpf_token_get_from_fd(u32 ufd)
 {
         return ERR_PTR(-EOPNOTSUPP);
 }
 
 static inline void __dev_flush(struct list_head *flush_list)
 {
 }
 
 struct xdp_frame;
 struct bpf_dtab_netdev;
 struct bpf_cpu_map_entry;
 
 static inline
 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
                     struct net_device *dev_rx)
 {
         return 0;
 }
 
 static inline
 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
                     struct net_device *dev_rx)
 {
         return 0;
 }
 
 static inline
 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
                           struct bpf_map *map, bool exclude_ingress)
 {
         return 0;
 }
 
 struct sk_buff;
 
 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
                                            struct sk_buff *skb,
                                            struct bpf_prog *xdp_prog)
 {
         return 0;
 }
 
 static inline
 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
                            struct bpf_prog *xdp_prog, struct bpf_map *map,
                            bool exclude_ingress)
 {
         return 0;
 }
 
 static inline void __cpu_map_flush(struct list_head *flush_list)
 {
 }
 
 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
                                   struct xdp_frame *xdpf,
                                   struct net_device *dev_rx)
 {
         return 0;
 }
 
 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
                                            struct sk_buff *skb)
 {
         return -EOPNOTSUPP;
 }
 
 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
                                 enum bpf_prog_type type)
 {
         return ERR_PTR(-EOPNOTSUPP);
 }
 
 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
                                         const union bpf_attr *kattr,
                                         union bpf_attr __user *uattr)
 {
         return -ENOTSUPP;
 }
 
 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
                                         const union bpf_attr *kattr,
                                         union bpf_attr __user *uattr)
 {
         return -ENOTSUPP;
 }
 
 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
                                             const union bpf_attr *kattr,
                                             union bpf_attr __user *uattr)
 {
         return -ENOTSUPP;
 }
 
 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
                                                    const union bpf_attr *kattr,
                                                    union bpf_attr __user *uattr)
 {
         return -ENOTSUPP;
 }
 
 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
                                               const union bpf_attr *kattr,
                                               union bpf_attr __user *uattr)
 {
         return -ENOTSUPP;
 }
 
 static inline void bpf_map_put(struct bpf_map *map)
 {
 }
 
 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
 {
         return ERR_PTR(-ENOTSUPP);
 }
 
 static inline int btf_struct_access(struct bpf_verifier_log *log,
                                     const struct bpf_reg_state *reg,
                                     int off, int size, enum bpf_access_type atype,
                                     u32 *next_btf_id, enum bpf_type_flag *flag,
                                     const char **field_name)
 {
         return -EACCES;
 }
 
 static inline const struct bpf_func_proto *
 bpf_base_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 {
         return NULL;
 }
 
 static inline void bpf_task_storage_free(struct task_struct *task)
 {
 }
 
 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
 {
         return false;
 }
 
 static inline const struct btf_func_model *
 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
                          const struct bpf_insn *insn)
 {
         return NULL;
 }
 
 static inline int
 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
                    u16 btf_fd_idx, u8 **func_addr)
 {
         return -ENOTSUPP;
 }
 
 static inline bool unprivileged_ebpf_enabled(void)
 {
         return false;
 }
 
 static inline bool has_current_bpf_ctx(void)
 {
         return false;
 }
 
 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
 {
 }
 
 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
 {
 }
 
 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
                                    enum bpf_dynptr_type type, u32 offset, u32 size)
 {
 }
 
 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
 {
 }
 
 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
 {
 }
 #endif /* CONFIG_BPF_SYSCALL */
 
 static __always_inline int
 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
 {
         int ret = -EFAULT;
 
         if (IS_ENABLED(CONFIG_BPF_EVENTS))
                 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
         if (unlikely(ret < 0))
                 memset(dst, 0, size);
         return ret;
 }
 
 void __bpf_free_used_btfs(struct btf_mod_pair *used_btfs, u32 len);
 
 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
                                                  enum bpf_prog_type type)
 {
         return bpf_prog_get_type_dev(ufd, type, false);
 }
 
 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
                           struct bpf_map **used_maps, u32 len);
 
 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
 
 int bpf_prog_offload_compile(struct bpf_prog *prog);
 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
                                struct bpf_prog *prog);
 
 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
 
 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
 int bpf_map_offload_update_elem(struct bpf_map *map,
                                 void *key, void *value, u64 flags);
 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
 int bpf_map_offload_get_next_key(struct bpf_map *map,
                                  void *key, void *next_key);
 
 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
 
 struct bpf_offload_dev *
 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
                                     struct net_device *netdev);
 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
                                        struct net_device *netdev);
 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
 
 void unpriv_ebpf_notify(int new_state);
 
 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
                               struct bpf_prog_aux *prog_aux);
 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
 
 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
 {
         return aux->dev_bound;
 }
 
 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
 {
         return aux->offload_requested;
 }
 
 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
 
 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
 {
         return unlikely(map->ops == &bpf_map_offload_ops);
 }
 
 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
 void bpf_map_offload_map_free(struct bpf_map *map);
 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
                               const union bpf_attr *kattr,
                               union bpf_attr __user *uattr);
 
 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
 int sock_map_bpf_prog_query(const union bpf_attr *attr,
                             union bpf_attr __user *uattr);
 int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog);
 
 void sock_map_unhash(struct sock *sk);
 void sock_map_destroy(struct sock *sk);
 void sock_map_close(struct sock *sk, long timeout);
 #else
 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
                                             struct bpf_prog_aux *prog_aux)
 {
         return -EOPNOTSUPP;
 }
 
 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
                                                 u32 func_id)
 {
         return NULL;
 }
 
 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
                                           union bpf_attr *attr)
 {
         return -EOPNOTSUPP;
 }
 
 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
                                              struct bpf_prog *old_prog)
 {
         return -EOPNOTSUPP;
 }
 
 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
 {
 }
 
 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
 {
         return false;
 }
 
 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
 {
         return false;
 }
 
 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
 {
         return false;
 }
 
 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
 {
         return false;
 }
 
 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
 {
         return ERR_PTR(-EOPNOTSUPP);
 }
 
 static inline void bpf_map_offload_map_free(struct bpf_map *map)
 {
 }
 
 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
 {
         return 0;
 }
 
 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
                                             const union bpf_attr *kattr,
                                             union bpf_attr __user *uattr)
 {
         return -ENOTSUPP;
 }
 
 #ifdef CONFIG_BPF_SYSCALL
 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
                                        struct bpf_prog *prog)
 {
         return -EINVAL;
 }
 
 static inline int sock_map_prog_detach(const union bpf_attr *attr,
                                        enum bpf_prog_type ptype)
 {
         return -EOPNOTSUPP;
 }
 
 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
                                            u64 flags)
 {
         return -EOPNOTSUPP;
 }
 
 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
                                           union bpf_attr __user *uattr)
 {
         return -EINVAL;
 }
 
 static inline int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
 {
         return -EOPNOTSUPP;
 }
 #endif /* CONFIG_BPF_SYSCALL */
 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
 
 static __always_inline void
 bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)
 {
         const struct bpf_prog_array_item *item;
         struct bpf_prog *prog;
 
         if (unlikely(!array))
                 return;
 
         item = &array->items[0];
         while ((prog = READ_ONCE(item->prog))) {
                 bpf_prog_inc_misses_counter(prog);
                 item++;
         }
 }
 
 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
 void bpf_sk_reuseport_detach(struct sock *sk);
 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
                                        void *value);
 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
                                        void *value, u64 map_flags);
 #else
 static inline void bpf_sk_reuseport_detach(struct sock *sk)
 {
 }
 
 #ifdef CONFIG_BPF_SYSCALL
 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
                                                      void *key, void *value)
 {
         return -EOPNOTSUPP;
 }
 
 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
                                                      void *key, void *value,
                                                      u64 map_flags)
 {
         return -EOPNOTSUPP;
 }
 #endif /* CONFIG_BPF_SYSCALL */
 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
 
 /* verifier prototypes for helper functions called from eBPF programs */
 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
 extern const struct bpf_func_proto bpf_map_update_elem_proto;
 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
 extern const struct bpf_func_proto bpf_map_push_elem_proto;
 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
 
 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
 extern const struct bpf_func_proto bpf_tail_call_proto;
 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
 extern const struct bpf_func_proto bpf_get_current_comm_proto;
 extern const struct bpf_func_proto bpf_get_stackid_proto;
 extern const struct bpf_func_proto bpf_get_stack_proto;
 extern const struct bpf_func_proto bpf_get_task_stack_proto;
 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
 extern const struct bpf_func_proto bpf_sock_map_update_proto;
 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
 extern const struct bpf_func_proto bpf_spin_lock_proto;
 extern const struct bpf_func_proto bpf_spin_unlock_proto;
 extern const struct bpf_func_proto bpf_get_local_storage_proto;
 extern const struct bpf_func_proto bpf_strtol_proto;
 extern const struct bpf_func_proto bpf_strtoul_proto;
 extern const struct bpf_func_proto bpf_tcp_sock_proto;
 extern const struct bpf_func_proto bpf_jiffies64_proto;
 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
 extern const struct bpf_func_proto bpf_event_output_data_proto;
 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
 extern const struct bpf_func_proto bpf_copy_from_user_proto;
 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
 extern const struct bpf_func_proto bpf_snprintf_proto;
 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
 extern const struct bpf_func_proto bpf_sock_from_file_proto;
 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
 extern const struct bpf_func_proto bpf_task_storage_get_proto;
 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
 extern const struct bpf_func_proto bpf_find_vma_proto;
 extern const struct bpf_func_proto bpf_loop_proto;
 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
 extern const struct bpf_func_proto bpf_set_retval_proto;
 extern const struct bpf_func_proto bpf_get_retval_proto;
 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
 
 const struct bpf_func_proto *tracing_prog_func_proto(
   enum bpf_func_id func_id, const struct bpf_prog *prog);
 
 /* Shared helpers among cBPF and eBPF. */
 void bpf_user_rnd_init_once(void);
 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 
 #if defined(CONFIG_NET)
 bool bpf_sock_common_is_valid_access(int off, int size,
                                      enum bpf_access_type type,
                                      struct bpf_insn_access_aux *info);
 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
                               struct bpf_insn_access_aux *info);
 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
                                 const struct bpf_insn *si,
                                 struct bpf_insn *insn_buf,
                                 struct bpf_prog *prog,
                                 u32 *target_size);
 int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
                                struct bpf_dynptr *ptr);
 #else
 static inline bool bpf_sock_common_is_valid_access(int off, int size,
                                                    enum bpf_access_type type,
                                                    struct bpf_insn_access_aux *info)
 {
         return false;
 }
 static inline bool bpf_sock_is_valid_access(int off, int size,
                                             enum bpf_access_type type,
                                             struct bpf_insn_access_aux *info)
 {
         return false;
 }
 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
                                               const struct bpf_insn *si,
                                               struct bpf_insn *insn_buf,
                                               struct bpf_prog *prog,
                                               u32 *target_size)
 {
         return 0;
 }
 static inline int bpf_dynptr_from_skb_rdonly(struct __sk_buff *skb, u64 flags,
                                              struct bpf_dynptr *ptr)
 {
         return -EOPNOTSUPP;
 }
 #endif
 
 #ifdef CONFIG_INET
 struct sk_reuseport_kern {
         struct sk_buff *skb;
         struct sock *sk;
         struct sock *selected_sk;
         struct sock *migrating_sk;
         void *data_end;
         u32 hash;
         u32 reuseport_id;
         bool bind_inany;
 };
 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
                                   struct bpf_insn_access_aux *info);
 
 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
                                     const struct bpf_insn *si,
                                     struct bpf_insn *insn_buf,
                                     struct bpf_prog *prog,
                                     u32 *target_size);
 
 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
                                   struct bpf_insn_access_aux *info);
 
 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
                                     const struct bpf_insn *si,
                                     struct bpf_insn *insn_buf,
                                     struct bpf_prog *prog,
                                     u32 *target_size);
 #else
 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
                                                 enum bpf_access_type type,
                                                 struct bpf_insn_access_aux *info)
 {
         return false;
 }
 
 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
                                                   const struct bpf_insn *si,
                                                   struct bpf_insn *insn_buf,
                                                   struct bpf_prog *prog,
                                                   u32 *target_size)
 {
         return 0;
 }
 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
                                                 enum bpf_access_type type,
                                                 struct bpf_insn_access_aux *info)
 {
         return false;
 }
 
 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
                                                   const struct bpf_insn *si,
                                                   struct bpf_insn *insn_buf,
                                                   struct bpf_prog *prog,
                                                   u32 *target_size)
 {
         return 0;
 }
 #endif /* CONFIG_INET */
 
 enum bpf_text_poke_type {
         BPF_MOD_CALL,
         BPF_MOD_JUMP,
 };
 
 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
                        void *addr1, void *addr2);
 
 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
                                struct bpf_prog *new, struct bpf_prog *old);
 
 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
 int bpf_arch_text_invalidate(void *dst, size_t len);
 
 struct btf_id_set;
 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
 
 #define MAX_BPRINTF_VARARGS             12
 #define MAX_BPRINTF_BUF                 1024
 
 struct bpf_bprintf_data {
         u32 *bin_args;
         char *buf;
         bool get_bin_args;
         bool get_buf;
 };
 
 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
                         u32 num_args, struct bpf_bprintf_data *data);
 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
 
 #ifdef CONFIG_BPF_LSM
 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
 void bpf_cgroup_atype_put(int cgroup_atype);
 #else
 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
 #endif /* CONFIG_BPF_LSM */
 
 struct key;
 
 #ifdef CONFIG_KEYS
 struct bpf_key {
         struct key *key;
         bool has_ref;
 };
 #endif /* CONFIG_KEYS */
 
 static inline bool type_is_alloc(u32 type)
 {
         return type & MEM_ALLOC;
 }
 
 static inline gfp_t bpf_memcg_flags(gfp_t flags)
 {
         if (memcg_bpf_enabled())
                 return flags | __GFP_ACCOUNT;
         return flags;
 }
 
 static inline bool bpf_is_subprog(const struct bpf_prog *prog)
 {
         return prog->aux->func_idx != 0;
 }
 
 #endif /* _LINUX_BPF_H */