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 /* 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>
 
 struct bpf_verifier_env;
 struct bpf_verifier_log;
 struct perf_event;
 struct bpf_prog;
 struct bpf_prog_aux;
 struct bpf_map;
 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;
 
 extern struct idr btf_idr;
 extern spinlock_t btf_idr_lock;
 extern struct kobject *btf_kobj;
 
 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, 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);
     int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
     int (*map_delete_elem)(struct bpf_map *map, void *key);
     int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
     int (*map_pop_elem)(struct bpf_map *map, void *value);
     int (*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);
     void (*map_fd_put_ptr)(void *ptr);
     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);
 
     /* 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.*/
     int (*map_redirect)(struct bpf_map *map, u32 ifindex, 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);
     int (*map_for_each_callback)(struct bpf_map *map,
                      bpf_callback_t callback_fn,
                      void *callback_ctx, u64 flags);
 
     /* 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 8 pointers in a BPF map value */
     BPF_MAP_VALUE_OFF_MAX = 8,
     BPF_MAP_OFF_ARR_MAX   = BPF_MAP_VALUE_OFF_MAX +
                 1 + /* for bpf_spin_lock */
                 1,  /* for bpf_timer */
 };
 
 enum bpf_kptr_type {
     BPF_KPTR_UNREF,
     BPF_KPTR_REF,
 };
 
 struct bpf_map_value_off_desc {
     u32 offset;
     enum bpf_kptr_type type;
     struct {
         struct btf *btf;
         struct module *module;
         btf_dtor_kfunc_t dtor;
         u32 btf_id;
     } kptr;
 };
 
 struct bpf_map_value_off {
     u32 nr_off;
     struct bpf_map_value_off_desc off[];
 };
 
 struct bpf_map_off_arr {
     u32 cnt;
     u32 field_off[BPF_MAP_OFF_ARR_MAX];
     u8 field_sz[BPF_MAP_OFF_ARR_MAX];
 };
 
 struct bpf_map {
     /* The first two cachelines with read-mostly members of which some
      * are also accessed in fast-path (e.g. ops, max_entries).
      */
     const struct bpf_map_ops *ops ____cacheline_aligned;
     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;
     int spin_lock_off; /* >=0 valid offset, <0 error */
     struct bpf_map_value_off *kptr_off_tab;
     int timer_off; /* >=0 valid offset, <0 error */
     u32 id;
     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_KMEM
     struct obj_cgroup *objcg;
 #endif
     char name[BPF_OBJ_NAME_LEN];
     struct bpf_map_off_arr *off_arr;
     /* The 3rd and 4th cacheline with misc members to avoid false sharing
      * particularly with refcounting.
      */
     atomic64_t refcnt ____cacheline_aligned;
     atomic64_t usercnt;
     struct work_struct work;
     struct mutex freeze_mutex;
     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 */
 };
 
 static inline bool map_value_has_spin_lock(const struct bpf_map *map)
 {
     return map->spin_lock_off >= 0;
 }
 
 static inline bool map_value_has_timer(const struct bpf_map *map)
 {
     return map->timer_off >= 0;
 }
 
 static inline bool map_value_has_kptrs(const struct bpf_map *map)
 {
     return !IS_ERR_OR_NULL(map->kptr_off_tab);
 }
 
 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
 {
     if (unlikely(map_value_has_spin_lock(map)))
         memset(dst + map->spin_lock_off, 0, sizeof(struct bpf_spin_lock));
     if (unlikely(map_value_has_timer(map)))
         memset(dst + map->timer_off, 0, sizeof(struct bpf_timer));
     if (unlikely(map_value_has_kptrs(map))) {
         struct bpf_map_value_off *tab = map->kptr_off_tab;
         int i;
 
         for (i = 0; i < tab->nr_off; i++)
             *(u64 *)(dst + tab->off[i].offset) = 0;
     }
 }
 
 /* copy everything but bpf_spin_lock and bpf_timer. There could be one of each. */
 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
 {
     u32 curr_off = 0;
     int i;
 
     if (likely(!map->off_arr)) {
         memcpy(dst, src, map->value_size);
         return;
     }
 
     for (i = 0; i < map->off_arr->cnt; i++) {
         u32 next_off = map->off_arr->field_off[i];
 
         memcpy(dst + curr_off, src + curr_off, next_off - curr_off);
         curr_off += map->off_arr->field_sz[i];
     }
     memcpy(dst + curr_off, src + curr_off, map->value_size - curr_off);
 }
 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
                bool lock_src);
 void bpf_timer_cancel_and_free(void *timer);
 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 was "allocated" from a different helper, and cannot be mixed
      * with regular non-MEM_ALLOC'ed MEM types.
      */
     MEM_ALLOC       = 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 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),
 
     __BPF_TYPE_FLAG_MAX,
     __BPF_TYPE_LAST_FLAG    = __BPF_TYPE_FLAG_MAX - 1,
 };
 
 #define DYNPTR_TYPE_FLAG_MASK   (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF)
 
 /* 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_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_ALLOC_MEM,   /* pointer to dynamically allocated 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_ALLOC_MEM_OR_NULL    = PTR_MAYBE_NULL | ARG_PTR_TO_ALLOC_MEM,
     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_ALLOC_MEM,       /* returns a pointer to dynamically allocated 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_ALLOC_MEM_OR_NULL    = PTR_MAYBE_NULL | MEM_ALLOC | RET_PTR_TO_ALLOC_MEM,
     RET_PTR_TO_DYNPTR_MEM_OR_NULL   = PTR_MAYBE_NULL | RET_PTR_TO_ALLOC_MEM,
     RET_PTR_TO_BTF_ID_OR_NULL   = PTR_MAYBE_NULL | 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;
     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_BUF,      /* reg points to a read/write buffer */
     PTR_TO_FUNC,         /* reg points to a bpf program function */
     __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 inline bool bpf_pseudo_func(const struct bpf_insn *insn)
 {
     return insn->code == (BPF_LD | BPF_IMM | BPF_DW) &&
            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_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 btf *btf,
                  const struct btf_type *t, int off, int size,
                  enum bpf_access_type atype,
                  u32 *next_btf_id, enum bpf_type_flag *flag);
 };
 
 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
 
 struct btf_func_model {
     u8 ret_size;
     u8 nr_args;
     u8 arg_size[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)
 
 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
  * bytes on x86.
  */
 #define BPF_MAX_TRAMP_LINKS 38
 
 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 *tr, void *image, void *image_end,
                 const struct btf_func_model *m, u32 flags,
                 struct bpf_tramp_links *tlinks,
                 void *orig_call);
 /* these two functions are called from generated trampoline */
 u64 notrace __bpf_prog_enter(struct bpf_prog *prog, struct bpf_tramp_run_ctx *run_ctx);
 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start, struct bpf_tramp_run_ctx *run_ctx);
 u64 notrace __bpf_prog_enter_sleepable(struct bpf_prog *prog, struct bpf_tramp_run_ctx *run_ctx);
 void notrace __bpf_prog_exit_sleepable(struct bpf_prog *prog, u64 start,
                        struct bpf_tramp_run_ctx *run_ctx);
 u64 notrace __bpf_prog_enter_lsm_cgroup(struct bpf_prog *prog,
                     struct bpf_tramp_run_ctx *run_ctx);
 void notrace __bpf_prog_exit_lsm_cgroup(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);
 
 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;
     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;
     u64 selector;
     struct module *mod;
 };
 
 struct bpf_attach_target_info {
     struct btf_func_model fmodel;
     long tgt_addr;
     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;
     u32 image_off;
     struct bpf_ksym ksym;
 };
 
 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
     const void *ctx,
     const struct bpf_insn *insnsi,
     bpf_func_t bpf_func)
 {
     return bpf_func(ctx, insnsi);
 }
 
 #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, s64 *funcs, int num_funcs);
 #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),  \
     },                          \
 }
 
 #define DEFINE_BPF_DISPATCHER(name)                 \
     noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
         const void *ctx,                    \
         const struct bpf_insn *insnsi,              \
         bpf_func_t bpf_func)                    \
     {                               \
         return bpf_func(ctx, insnsi);               \
     }                               \
     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_jit_alloc_exec_page(void);
 void bpf_image_ksym_add(void *data, 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 ERR_PTR(-EOPNOTSUPP);
 }
 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;
 };
 
 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;
     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 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 offload_requested;
     bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
     bool func_proto_unreliable;
     bool sleepable;
     bool tail_call_reachable;
     bool xdp_has_frags;
     /* 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;
     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];
 #ifdef CONFIG_SECURITY
     void *security;
 #endif
     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;
     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 */
     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;
     struct work_struct work;
 };
 
 struct bpf_link_ops {
     void (*release)(struct bpf_link *link);
     void (*dealloc)(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);
 };
 
 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_link_primer {
     struct bpf_link *link;
     struct file *file;
     int fd;
     u32 id;
 };
 
 struct bpf_struct_ops_value;
 struct btf_member;
 
 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
 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);
     int (*init_member)(const struct btf_type *t,
                const struct btf_member *member,
                void *kdata, const void *udata);
     int (*reg)(void *kdata);
     void (*unreg)(void *kdata);
     const struct btf_type *type;
     const struct btf_type *value_type;
     const char *name;
     struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
     u32 type_id;
     u32 value_id;
 };
 
 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
 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 *image, void *image_end);
 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);
 }
 
 #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 bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
                 union bpf_attr __user *uattr);
 #endif
 #else
 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
 {
     return NULL;
 }
 static inline void bpf_struct_ops_init(struct btf *btf,
                        struct bpf_verifier_log *log)
 {
 }
 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;
 }
 #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 {
         char value[0] __aligned(8);
         void *ptrs[0] __aligned(8);
         void __percpu *pptrs[0] __aligned(8);
     };
 };
 
 #define BPF_COMPLEXITY_LIMIT_INSNS      1000000 /* yes. 1M insns */
 #define MAX_TAIL_CALL_CNT 33
 
 /* Maximum number of loops for bpf_loop */
 #define BPF_MAX_LOOPS   BIT(23)
 
 #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)
 
 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;
 };
 
 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;
 
     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_sleepable(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();
 
     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->aux->sleepable)
             rcu_read_lock();
 
         run_ctx.bpf_cookie = item->bpf_cookie;
         ret &= run_prog(prog, ctx);
         item++;
 
         if (!prog->aux->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 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, bool do_idr_lock);
 void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
 
 struct bpf_map_value_off_desc *bpf_map_kptr_off_contains(struct bpf_map *map, u32 offset);
 void bpf_map_free_kptr_off_tab(struct bpf_map *map);
 struct bpf_map_value_off *bpf_map_copy_kptr_off_tab(const struct bpf_map *map);
 bool bpf_map_equal_kptr_off_tab(const struct bpf_map *map_a, const struct bpf_map *map_b);
 void bpf_map_free_kptrs(struct bpf_map *map, void *map_value);
 
 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 * __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,
                   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);
 
 #ifdef CONFIG_MEMCG_KMEM
 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 __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
                     size_t align, gfp_t flags);
 #else
 static inline void *
 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
              int node)
 {
     return kmalloc_node(size, flags, node);
 }
 
 static inline void *
 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
 {
     return kzalloc(size, flags);
 }
 
 static inline void __percpu *
 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
              gfp_t flags)
 {
     return __alloc_percpu_gfp(size, align, flags);
 }
 #endif
 
 extern int sysctl_unprivileged_bpf_disabled;
 
 static inline bool bpf_allow_ptr_leaks(void)
 {
     return perfmon_capable();
 }
 
 static inline bool bpf_allow_uninit_stack(void)
 {
     return perfmon_capable();
 }
 
 static inline bool bpf_allow_ptr_to_map_access(void)
 {
     return perfmon_capable();
 }
 
 static inline bool bpf_bypass_spec_v1(void)
 {
     return perfmon_capable();
 }
 
 static inline bool bpf_bypass_spec_v4(void)
 {
     return perfmon_capable();
 }
 
 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);
 void bpf_link_put(struct bpf_link *link);
 int bpf_link_new_fd(struct bpf_link *link);
 struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
 
 int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
 int bpf_obj_get_user(const char __user *pathname, int flags);
 
 #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; }
 
 struct bpf_iter_aux_info {
     struct bpf_map *map;
 };
 
 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);
 
 /* 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--)
         *ldst++ = *lsrc++;
 }
 
 /* verify correctness of eBPF program */
 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);
 
 #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(void);
 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(void);
 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);
 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 btf *btf,
               const struct btf_type *t, int off, int size,
               enum bpf_access_type atype,
               u32 *next_btf_id, enum bpf_type_flag *flag);
 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_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
                 struct bpf_reg_state *regs);
 int btf_check_kfunc_arg_match(struct bpf_verifier_env *env,
                   const struct btf *btf, u32 func_id,
                   struct bpf_reg_state *regs,
                   u32 kfunc_flags);
 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
               struct bpf_reg_state *reg);
 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
              struct btf *btf, const struct btf_type *t);
 
 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);
 void bpf_task_storage_free(struct task_struct *task);
 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);
 struct bpf_core_ctx {
     struct bpf_verifier_log *log;
     const struct btf *btf;
 };
 
 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;
 }
 
 #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 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 void __dev_flush(void)
 {
 }
 
 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(void)
 {
 }
 
 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 const struct bpf_func_proto *
 bpf_base_func_proto(enum bpf_func_id func_id)
 {
     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 bool unprivileged_ebpf_enabled(void)
 {
     return false;
 }
 
 #endif /* CONFIG_BPF_SYSCALL */
 
 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
               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_offload_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_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);
 
 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
 {
     return aux->offload_requested;
 }
 
 static inline bool bpf_map_is_dev_bound(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);
 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);
 
 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_prog_offload_init(struct bpf_prog *prog,
                     union bpf_attr *attr)
 {
     return -EOPNOTSUPP;
 }
 
 static inline bool bpf_prog_is_dev_bound(struct bpf_prog_aux *aux)
 {
     return false;
 }
 
 static inline bool bpf_map_is_dev_bound(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 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;
 }
 #endif /* CONFIG_BPF_SYSCALL */
 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
 
 #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_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_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_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;
 
 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);
 #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;
 }
 #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_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
 
 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
             u32 **bin_buf, u32 num_args);
 void bpf_bprintf_cleanup(void);
 
 /* 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,
 };
 
 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);
 int bpf_dynptr_check_size(u32 size);
 
 #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 */
 
 #endif /* _LINUX_BPF_H */