/* 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 <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/u64_stats_sync.h>

  #include <linux/refcount.h>
  #include <linux/mutex.h>

  #include <linux/module.h>

  #include <linux/kallsyms.h>

  #include <linux/capability.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;

  extern struct idr btf_idr;
  extern spinlock_t btf_idr_lock;

  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);
  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 accesible 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_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);

  
  	/* 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);

  
  	/* 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);

  	/* BTF name and id of struct allocated by map_alloc */
  	const char * const map_btf_name;
  	int *map_btf_id;

  
  	/* bpf_iter info used to open a seq_file */
  	const struct bpf_iter_seq_info *iter_seq_info;

  };

  struct bpf_map_memory {
  	u32 pages;
  	struct user_struct *user;
  };

  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;

  	u32 map_flags;

  	int spin_lock_off; /* >=0 valid offset, <0 error */

  	u32 id;

  	int numa_node;

  	u32 btf_key_type_id;
  	u32 btf_value_type_id;

  	struct btf *btf;

  	struct bpf_map_memory memory;

  	char name[BPF_OBJ_NAME_LEN];

  	u32 btf_vmlinux_value_type_id;

  	bool bypass_spec_v1;

  	bool frozen; /* write-once; write-protected by freeze_mutex */
  	/* 22 bytes hole */

  	/* 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;
  	u64 writecnt; /* writable mmap cnt; 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 void check_and_init_map_lock(struct bpf_map *map, void *dst)
  {
  	if (likely(!map_value_has_spin_lock(map)))
  		return;
  	*(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
  		(struct bpf_spin_lock){};
  }
  
  /* copy everything but bpf_spin_lock */
  static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
  {
  	if (unlikely(map_value_has_spin_lock(map))) {
  		u32 off = map->spin_lock_off;
  
  		memcpy(dst, src, off);
  		memcpy(dst + off + sizeof(struct bpf_spin_lock),
  		       src + off + sizeof(struct bpf_spin_lock),
  		       map->value_size - off - sizeof(struct bpf_spin_lock));
  	} else {
  		memcpy(dst, src, map->value_size);
  	}
  }

  void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
  			   bool lock_src);

  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;

  /* 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 */

  	ARG_PTR_TO_UNINIT_MAP_VALUE,	/* pointer to valid memory used to store a map value */

  	ARG_PTR_TO_MAP_VALUE_OR_NULL,	/* pointer to stack used as map value or NULL */

  
  	/* the following constraints used to prototype bpf_memcmp() and other
  	 * functions that access data on eBPF program stack
  	 */

  	ARG_PTR_TO_MEM,		/* pointer to valid memory (stack, packet, map value) */

  	ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */

  	ARG_PTR_TO_UNINIT_MEM,	/* pointer to memory does not need to be initialized,
  				 * helper function must fill all bytes or clear
  				 * them in error case.

  				 */

  	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_PTR_TO_CTX_OR_NULL,	/* pointer to context or NULL */

  	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_SOCKET_OR_NULL,	/* pointer to bpf_sock (fullsock) or NULL */

  	ARG_PTR_TO_BTF_ID,	/* pointer to in-kernel struct */

  	ARG_PTR_TO_ALLOC_MEM,	/* pointer to dynamically allocated memory */
  	ARG_PTR_TO_ALLOC_MEM_OR_NULL,	/* pointer to dynamically allocated memory or NULL */
  	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 */

  	__BPF_ARG_TYPE_MAX,

  };
  
  /* 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_MAP_VALUE_OR_NULL,	/* returns a pointer to map elem value or NULL */

  	RET_PTR_TO_SOCKET_OR_NULL,	/* returns a pointer to a socket or NULL */

  	RET_PTR_TO_TCP_SOCK_OR_NULL,	/* returns a pointer to a tcp_sock or NULL */

  	RET_PTR_TO_SOCK_COMMON_OR_NULL,	/* returns a pointer to a sock_common or NULL */

  	RET_PTR_TO_ALLOC_MEM_OR_NULL,	/* returns a pointer to dynamically allocated memory or NULL */

  	RET_PTR_TO_BTF_ID_OR_NULL,	/* returns a pointer to a btf_id or NULL */

  	RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL, /* returns a pointer to a valid memory or a btf_id or NULL */

  	RET_PTR_TO_MEM_OR_BTF_ID,	/* returns a pointer to a valid memory or a btf_id */

  };

  /* 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];
  	};

  	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_VALUE_OR_NULL,/* points to map elem value or NULL */

  	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_SOCKET_OR_NULL,	 /* reg points to struct bpf_sock or NULL */

  	PTR_TO_SOCK_COMMON,	 /* reg points to sock_common */
  	PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */

  	PTR_TO_TCP_SOCK,	 /* reg points to struct tcp_sock */
  	PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */

  	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_BTF_ID_OR_NULL,

  	PTR_TO_MEM,		 /* reg points to valid memory region */
  	PTR_TO_MEM_OR_NULL,	 /* reg points to valid memory region or NULL */

  	PTR_TO_RDONLY_BUF,	 /* reg points to a readonly buffer */
  	PTR_TO_RDONLY_BUF_OR_NULL, /* reg points to a readonly buffer or NULL */
  	PTR_TO_RDWR_BUF,	 /* reg points to a read/write buffer */
  	PTR_TO_RDWR_BUF_OR_NULL, /* reg points to a read/write buffer or NULL */

  	PTR_TO_PERCPU_BTF_ID,	 /* reg points to a percpu kernel variable */

  };

  /* 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;
  		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;
  }

  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_type *t, int off, int size,
  				 enum bpf_access_type atype,
  				 u32 *next_btf_id);

  };

  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

  struct bpf_prog_stats {
  	u64 cnt;
  	u64 nsecs;
  	struct u64_stats_sync syncp;

  } __aligned(2 * sizeof(u64));

  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)

  /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
   * bytes on x86.  Pick a number to fit into BPF_IMAGE_SIZE / 2
   */
  #define BPF_MAX_TRAMP_PROGS 40
  
  struct bpf_tramp_progs {
  	struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
  	int nr_progs;
  };

  /* 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
   */

  int arch_prepare_bpf_trampoline(void *image, void *image_end,
  				const struct btf_func_model *m, u32 flags,

  				struct bpf_tramp_progs *tprogs,

  				void *orig_call);
  /* these two functions are called from generated trampoline */
  u64 notrace __bpf_prog_enter(void);
  void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);

  void notrace __bpf_prog_enter_sleepable(void);
  void notrace __bpf_prog_exit_sleepable(void);

  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_trampoline {
  	/* hlist for trampoline_table */
  	struct hlist_node hlist;
  	/* serializes access to fields of this trampoline */
  	struct mutex mutex;
  	refcount_t refcnt;
  	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 */
  	void *image;
  	u64 selector;

  	struct bpf_ksym ksym;

  };

  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,
  	unsigned int (*bpf_func)(const void *,
  				 const struct bpf_insn *))
  {
  	return bpf_func(ctx, insnsi);
  }

  #ifdef CONFIG_BPF_JIT

  int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr);
  int bpf_trampoline_unlink_prog(struct bpf_prog *prog, 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);

  #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,				\
  		unsigned int (*bpf_func)(const void *,			\
  					 const struct bpf_insn *))	\
  	{								\
  		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,				\
  		unsigned int (*bpf_func)(const void *,			\
  					 const struct bpf_insn *));	\

  	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);

  #else

  static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
  					   struct bpf_trampoline *tr)

  {
  	return -ENOTSUPP;
  }

  static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog,
  					     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;
  }

  #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;

  	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 bpf_prog_aux {

  	atomic64_t refcnt;

  	u32 used_map_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;

  	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;

  	enum bpf_tramp_prog_type trampoline_prog_type;

  	struct hlist_node tramp_hlist;

  	/* 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;
  	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 bpf_prog *prog;

  	struct user_struct *user;

  	u64 load_time; /* ns since boottime */

  	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;

  	struct bpf_prog_stats __percpu *stats;

  	union {
  		struct work_struct work;
  		struct rcu_head	rcu;
  	};

  };

  struct bpf_array_aux {
  	/* 'Ownership' of prog array 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 and JITed flag.
  	 */
  	enum bpf_prog_type type;
  	bool jited;

  	/* 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_link_primer {
  	struct bpf_link *link;
  	struct file *file;
  	int fd;
  	u32 id;
  };

  struct bpf_struct_ops_value;

  struct btf_type;
  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);
  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);
  }

  #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

  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 32

  #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;
  };

  bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);

  int bpf_prog_calc_tag(struct bpf_prog *fp);

  const char *kernel_type_name(u32 btf_type_id);

  const struct bpf_func_proto *bpf_get_trace_printk_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(&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;

  	struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];

  };

  struct bpf_prog_array {
  	struct rcu_head rcu;

  	struct bpf_prog_array_item items[];

  };

  struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);

  void bpf_prog_array_free(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,
  			struct bpf_prog_array **new_array);
  
  #define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)	\

  	({						\

  		struct bpf_prog_array_item *_item;	\
  		struct bpf_prog *_prog;			\

  		struct bpf_prog_array *_array;		\

  		u32 _ret = 1;				\

  		migrate_disable();			\

  		rcu_read_lock();			\

  		_array = rcu_dereference(array);	\
  		if (unlikely(check_non_null && !_array))\
  			goto _out;			\

  		_item = &_array->items[0];		\
  		while ((_prog = READ_ONCE(_item->prog))) {		\
  			bpf_cgroup_storage_set(_item->cgroup_storage);	\
  			_ret &= func(_prog, ctx);	\
  			_item++;			\

  		}					\
  _out:							\

  		rcu_read_unlock();			\

  		migrate_enable();			\

  		_ret;					\
  	 })

  /* To be used by __cgroup_bpf_run_filter_skb for EGRESS BPF progs
   * so BPF programs can request cwr for TCP packets.
   *
   * Current cgroup skb programs can only return 0 or 1 (0 to drop the
   * packet. This macro changes the behavior so the low order bit
   * indicates whether the packet should be dropped (0) or not (1)
   * and the next bit is a congestion notification bit. This could be
   * used by TCP to call tcp_enter_cwr()
   *
   * Hence, new allowed return values of CGROUP EGRESS BPF programs are:
   *   0: drop packet
   *   1: keep packet
   *   2: drop packet and cn
   *   3: keep packet and cn
   *
   * This macro then converts it to one of the NET_XMIT or an error
   * code that is then interpreted as drop packet (and no cn):
   *   0: NET_XMIT_SUCCESS  skb should be transmitted
   *   1: NET_XMIT_DROP     skb should be dropped and cn
   *   2: NET_XMIT_CN       skb should be transmitted and cn
   *   3: -EPERM            skb should be dropped
   */
  #define BPF_PROG_CGROUP_INET_EGRESS_RUN_ARRAY(array, ctx, func)		\
  	({						\
  		struct bpf_prog_array_item *_item;	\
  		struct bpf_prog *_prog;			\
  		struct bpf_prog_array *_array;		\
  		u32 ret;				\
  		u32 _ret = 1;				\
  		u32 _cn = 0;				\

  		migrate_disable();			\

  		rcu_read_lock();			\
  		_array = rcu_dereference(array);	\
  		_item = &_array->items[0];		\
  		while ((_prog = READ_ONCE(_item->prog))) {		\
  			bpf_cgroup_storage_set(_item->cgroup_storage);	\
  			ret = func(_prog, ctx);		\
  			_ret &= (ret & 1);		\
  			_cn |= (ret & 2);		\
  			_item++;			\
  		}					\
  		rcu_read_unlock();			\

  		migrate_enable();			\

  		if (_ret)				\
  			_ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS);	\
  		else					\
  			_ret = (_cn ? NET_XMIT_DROP : -EPERM);		\
  		_ret;					\
  	})

  #define BPF_PROG_RUN_ARRAY(array, ctx, func)		\
  	__BPF_PROG_RUN_ARRAY(array, ctx, func, false)
  
  #define BPF_PROG_RUN_ARRAY_CHECK(array, ctx, func)	\
  	__BPF_PROG_RUN_ARRAY(array, ctx, func, true)

  #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.
   *
   * Use the preemption safe inc/dec variants on RT because migrate disable
   * is preemptible on RT and preemption in the middle of the RMW operation
   * might lead to inconsistent state. Use the raw variants for non RT
   * kernels as migrate_disable() maps to preempt_disable() so the slightly
   * more expensive save operation can be avoided.
   */
  static inline void bpf_disable_instrumentation(void)
  {
  	migrate_disable();
  	if (IS_ENABLED(CONFIG_PREEMPT_RT))
  		this_cpu_inc(bpf_prog_active);
  	else
  		__this_cpu_inc(bpf_prog_active);
  }
  
  static inline void bpf_enable_instrumentation(void)
  {
  	if (IS_ENABLED(CONFIG_PREEMPT_RT))
  		this_cpu_dec(bpf_prog_active);
  	else
  		__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);

  int __bpf_prog_charge(struct user_struct *user, u32 pages);
  void __bpf_prog_uncharge(struct user_struct *user, u32 pages);

  void __bpf_free_used_maps(struct bpf_prog_aux *aux,
  			  struct bpf_map **used_maps, u32 len);

  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 *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);

  int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
  void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);

  int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);

  void bpf_map_charge_finish(struct bpf_map_memory *mem);
  void bpf_map_charge_move(struct bpf_map_memory *dst,
  			 struct bpf_map_memory *src);

  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);

  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);

  extern int sysctl_unprivileged_bpf_disabled;

  static inline bool bpf_allow_ptr_leaks(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);

  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);

  #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;

  	u32 ctx_arg_info_size;
  	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);

  int bpf_iter_link_attach(const union bpf_attr *attr, 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 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(void __user *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,
  	      union bpf_attr __user *uattr);

  void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);

  struct btf *bpf_get_btf_vmlinux(void);

  /* Map specifics */

  struct xdp_buff;

  struct sk_buff;

  
  struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);

  struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);

  void __dev_flush(void);
  int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
  		    struct net_device *dev_rx);

  int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
  		    struct net_device *dev_rx);

  int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
  			     struct bpf_prog *xdp_prog);

  bool dev_map_can_have_prog(struct bpf_map *map);

  struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);

  void __cpu_map_flush(void);

  int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
  		    struct net_device *dev_rx);

  bool cpu_map_prog_allowed(struct bpf_map *map);

  /* 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);

  bool btf_ctx_access(int off, int size, enum bpf_access_type type,
  		    const struct bpf_prog *prog,
  		    struct bpf_insn_access_aux *info);
  int btf_struct_access(struct bpf_verifier_log *log,
  		      const struct btf_type *t, int off, int size,
  		      enum bpf_access_type atype,
  		      u32 *next_btf_id);

  bool btf_struct_ids_match(struct bpf_verifier_log *log,
  			  int off, u32 id, u32 need_type_id);

  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_func_arg_match(struct bpf_verifier_env *env, int subprog,
  			     struct bpf_reg_state *regs);
  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);

  #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 int __bpf_prog_charge(struct user_struct *user, u32 pages)
  {
  	return 0;
  }
  
  static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
  {
  }

  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 struct net_device  *__dev_map_lookup_elem(struct bpf_map *map,
  						       u32 key)
  {
  	return NULL;
  }

  static inline struct net_device  *__dev_map_hash_lookup_elem(struct bpf_map *map,
  							     u32 key)
  {
  	return NULL;
  }

  static inline bool dev_map_can_have_prog(struct bpf_map *map)
  {
  	return false;
  }

  static inline void __dev_flush(void)

  {
  }

  struct xdp_buff;
  struct bpf_dtab_netdev;
  
  static inline

  int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
  		    struct net_device *dev_rx)
  {
  	return 0;
  }
  
  static inline

  int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
  		    struct net_device *dev_rx)

  {
  	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
  struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)
  {
  	return NULL;
  }

  static inline void __cpu_map_flush(void)

  {
  }

  static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
  				  struct xdp_buff *xdp,
  				  struct net_device *dev_rx)
  {
  	return 0;
  }

  static inline bool cpu_map_prog_allowed(struct bpf_map *map)
  {
  	return false;
  }

  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 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;
  }

  #endif /* CONFIG_BPF_SYSCALL */

  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);
  }

  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);

  #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);

  #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)
  {
  }

  #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */

  #if defined(CONFIG_BPF_STREAM_PARSER)

  int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog,
  			 struct bpf_prog *old, u32 which);

  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);

  void sock_map_unhash(struct sock *sk);
  void sock_map_close(struct sock *sk, long timeout);

  #else

  static inline int sock_map_prog_update(struct bpf_map *map,

  				       struct bpf_prog *prog,
  				       struct bpf_prog *old, u32 which)

  {
  	return -EOPNOTSUPP;
  }

  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;
  }

  #endif /* CONFIG_BPF_STREAM_PARSER */

  #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_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;