mptcp: simplify subflow_syn_recv_sock()

[linux.git] / include / linux / bpf.h

/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
 */
#ifndef _LINUX_BPF_H
#define _LINUX_BPF_H 1

#include <uapi/linux/bpf.h>
#include <uapi/linux/filter.h>

#include <linux/workqueue.h>
#include <linux/file.h>
#include <linux/percpu.h>
#include <linux/err.h>
#include <linux/rbtree_latch.h>
#include <linux/numa.h>
#include <linux/mm_types.h>
#include <linux/wait.h>
#include <linux/refcount.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/capability.h>
#include <linux/sched/mm.h>
#include <linux/slab.h>
#include <linux/percpu-refcount.h>
#include <linux/stddef.h>
#include <linux/bpfptr.h>
#include <linux/btf.h>
#include <linux/rcupdate_trace.h>
#include <linux/static_call.h>
#include <linux/memcontrol.h>

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;
struct cgroup;

extern struct idr btf_idr;
extern spinlock_t btf_idr_lock;
extern struct kobject *btf_kobj;
extern struct bpf_mem_alloc bpf_global_ma;
extern bool bpf_global_ma_set;

typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
                                        struct bpf_iter_aux_info *aux);
typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
typedef unsigned int (*bpf_func_t)(const void *,
                                   const struct bpf_insn *);
struct bpf_iter_seq_info {
        const struct seq_operations *seq_ops;
        bpf_iter_init_seq_priv_t init_seq_private;
        bpf_iter_fini_seq_priv_t fini_seq_private;
        u32 seq_priv_size;
};

/* map is generic key/value storage optionally accessible by eBPF programs */
struct bpf_map_ops {
        /* funcs callable from userspace (via syscall) */
        int (*map_alloc_check)(union bpf_attr *attr);
        struct bpf_map *(*map_alloc)(union bpf_attr *attr);
        void (*map_release)(struct bpf_map *map, struct file *map_file);
        void (*map_free)(struct bpf_map *map);
        int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
        void (*map_release_uref)(struct bpf_map *map);
        void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
        int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
                                union bpf_attr __user *uattr);
        int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
                                          void *value, u64 flags);
        int (*map_lookup_and_delete_batch)(struct bpf_map *map,
                                           const union bpf_attr *attr,
                                           union bpf_attr __user *uattr);
        int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
                                const union bpf_attr *attr,
                                union bpf_attr __user *uattr);
        int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
                                union bpf_attr __user *uattr);

        /* funcs callable from userspace and from eBPF programs */
        void *(*map_lookup_elem)(struct bpf_map *map, void *key);
        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, u64 key, u64 flags);

        /* map_meta_equal must be implemented for maps that can be
         * used as an inner map.  It is a runtime check to ensure
         * an inner map can be inserted to an outer map.
         *
         * Some properties of the inner map has been used during the
         * verification time.  When inserting an inner map at the runtime,
         * map_meta_equal has to ensure the inserting map has the same
         * properties that the verifier has used earlier.
         */
        bool (*map_meta_equal)(const struct bpf_map *meta0,
                               const struct bpf_map *meta1);


        int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
                                              struct bpf_func_state *caller,
                                              struct bpf_func_state *callee);
        int (*map_for_each_callback)(struct bpf_map *map,
                                     bpf_callback_t callback_fn,
                                     void *callback_ctx, u64 flags);

        u64 (*map_mem_usage)(const struct bpf_map *map);

        /* BTF id of struct allocated by map_alloc */
        int *map_btf_id;

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

enum {
        /* Support at most 10 fields in a BTF type */
        BTF_FIELDS_MAX     = 10,
};

enum btf_field_type {
        BPF_SPIN_LOCK  = (1 << 0),
        BPF_TIMER      = (1 << 1),
        BPF_KPTR_UNREF = (1 << 2),
        BPF_KPTR_REF   = (1 << 3),
        BPF_KPTR       = BPF_KPTR_UNREF | BPF_KPTR_REF,
        BPF_LIST_HEAD  = (1 << 4),
        BPF_LIST_NODE  = (1 << 5),
        BPF_RB_ROOT    = (1 << 6),
        BPF_RB_NODE    = (1 << 7),
        BPF_GRAPH_NODE_OR_ROOT = BPF_LIST_NODE | BPF_LIST_HEAD |
                                 BPF_RB_NODE | BPF_RB_ROOT,
};

struct btf_field_kptr {
        struct btf *btf;
        struct module *module;
        btf_dtor_kfunc_t dtor;
        u32 btf_id;
};

struct btf_field_graph_root {
        struct btf *btf;
        u32 value_btf_id;
        u32 node_offset;
        struct btf_record *value_rec;
};

struct btf_field {
        u32 offset;
        enum btf_field_type type;
        union {
                struct btf_field_kptr kptr;
                struct btf_field_graph_root graph_root;
        };
};

struct btf_record {
        u32 cnt;
        u32 field_mask;
        int spin_lock_off;
        int timer_off;
        struct btf_field fields[];
};

struct btf_field_offs {
        u32 cnt;
        u32 field_off[BTF_FIELDS_MAX];
        u8 field_sz[BTF_FIELDS_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;
        u32 id;
        struct btf_record *record;
        int numa_node;
        u32 btf_key_type_id;
        u32 btf_value_type_id;
        u32 btf_vmlinux_value_type_id;
        struct btf *btf;
#ifdef CONFIG_MEMCG_KMEM
        struct obj_cgroup *objcg;
#endif
        char name[BPF_OBJ_NAME_LEN];
        struct btf_field_offs *field_offs;
        /* 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 const char *btf_field_type_name(enum btf_field_type type)
{
        switch (type) {
        case BPF_SPIN_LOCK:
                return "bpf_spin_lock";
        case BPF_TIMER:
                return "bpf_timer";
        case BPF_KPTR_UNREF:
        case BPF_KPTR_REF:
                return "kptr";
        case BPF_LIST_HEAD:
                return "bpf_list_head";
        case BPF_LIST_NODE:
                return "bpf_list_node";
        case BPF_RB_ROOT:
                return "bpf_rb_root";
        case BPF_RB_NODE:
                return "bpf_rb_node";
        default:
                WARN_ON_ONCE(1);
                return "unknown";
        }
}

static inline u32 btf_field_type_size(enum btf_field_type type)
{
        switch (type) {
        case BPF_SPIN_LOCK:
                return sizeof(struct bpf_spin_lock);
        case BPF_TIMER:
                return sizeof(struct bpf_timer);
        case BPF_KPTR_UNREF:
        case BPF_KPTR_REF:
                return sizeof(u64);
        case BPF_LIST_HEAD:
                return sizeof(struct bpf_list_head);
        case BPF_LIST_NODE:
                return sizeof(struct bpf_list_node);
        case BPF_RB_ROOT:
                return sizeof(struct bpf_rb_root);
        case BPF_RB_NODE:
                return sizeof(struct bpf_rb_node);
        default:
                WARN_ON_ONCE(1);
                return 0;
        }
}

static inline u32 btf_field_type_align(enum btf_field_type type)
{
        switch (type) {
        case BPF_SPIN_LOCK:
                return __alignof__(struct bpf_spin_lock);
        case BPF_TIMER:
                return __alignof__(struct bpf_timer);
        case BPF_KPTR_UNREF:
        case BPF_KPTR_REF:
                return __alignof__(u64);
        case BPF_LIST_HEAD:
                return __alignof__(struct bpf_list_head);
        case BPF_LIST_NODE:
                return __alignof__(struct bpf_list_node);
        case BPF_RB_ROOT:
                return __alignof__(struct bpf_rb_root);
        case BPF_RB_NODE:
                return __alignof__(struct bpf_rb_node);
        default:
                WARN_ON_ONCE(1);
                return 0;
        }
}

static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
{
        if (IS_ERR_OR_NULL(rec))
                return false;
        return rec->field_mask & type;
}

static inline void bpf_obj_init(const struct btf_field_offs *foffs, void *obj)
{
        int i;

        if (!foffs)
                return;
        for (i = 0; i < foffs->cnt; i++)
                memset(obj + foffs->field_off[i], 0, foffs->field_sz[i]);
}

/* 'dst' must be a temporary buffer and should not point to memory that is being
 * used in parallel by a bpf program or bpf syscall, otherwise the access from
 * the bpf program or bpf syscall may be corrupted by the reinitialization,
 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
 * program or bpf syscall.
 */
static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
{
        bpf_obj_init(map->field_offs, dst);
}

/* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
 * forced to use 'long' read/writes to try to atomically copy long counters.
 * Best-effort only.  No barriers here, since it _will_ race with concurrent
 * updates from BPF programs. Called from bpf syscall and mostly used with
 * size 8 or 16 bytes, so ask compiler to inline it.
 */
static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
{
        const long *lsrc = src;
        long *ldst = dst;

        size /= sizeof(long);
        while (size--)
                *ldst++ = *lsrc++;
}

/* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
static inline void bpf_obj_memcpy(struct btf_field_offs *foffs,
                                  void *dst, void *src, u32 size,
                                  bool long_memcpy)
{
        u32 curr_off = 0;
        int i;

        if (likely(!foffs)) {
                if (long_memcpy)
                        bpf_long_memcpy(dst, src, round_up(size, 8));
                else
                        memcpy(dst, src, size);
                return;
        }

        for (i = 0; i < foffs->cnt; i++) {
                u32 next_off = foffs->field_off[i];
                u32 sz = next_off - curr_off;

                memcpy(dst + curr_off, src + curr_off, sz);
                curr_off += foffs->field_sz[i] + sz;
        }
        memcpy(dst + curr_off, src + curr_off, size - curr_off);
}

static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
{
        bpf_obj_memcpy(map->field_offs, dst, src, map->value_size, false);
}

static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
{
        bpf_obj_memcpy(map->field_offs, dst, src, map->value_size, true);
}

static inline void bpf_obj_memzero(struct btf_field_offs *foffs, void *dst, u32 size)
{
        u32 curr_off = 0;
        int i;

        if (likely(!foffs)) {
                memset(dst, 0, size);
                return;
        }

        for (i = 0; i < foffs->cnt; i++) {
                u32 next_off = foffs->field_off[i];
                u32 sz = next_off - curr_off;

                memset(dst + curr_off, 0, sz);
                curr_off += foffs->field_sz[i] + sz;
        }
        memset(dst + curr_off, 0, size - curr_off);
}

static inline void zero_map_value(struct bpf_map *map, void *dst)
{
        bpf_obj_memzero(map->field_offs, dst, map->value_size);
}

void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
                           bool lock_src);
void bpf_timer_cancel_and_free(void *timer);
void bpf_list_head_free(const struct btf_field *field, void *list_head,
                        struct bpf_spin_lock *spin_lock);
void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
                      struct bpf_spin_lock *spin_lock);


int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);

struct bpf_offload_dev;
struct bpf_offloaded_map;

struct bpf_map_dev_ops {
        int (*map_get_next_key)(struct bpf_offloaded_map *map,
                                void *key, void *next_key);
        int (*map_lookup_elem)(struct bpf_offloaded_map *map,
                               void *key, void *value);
        int (*map_update_elem)(struct bpf_offloaded_map *map,
                               void *key, void *value, u64 flags);
        int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
};

struct bpf_offloaded_map {
        struct bpf_map map;
        struct net_device *netdev;
        const struct bpf_map_dev_ops *dev_ops;
        void *dev_priv;
        struct list_head offloads;
};

static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
{
        return container_of(map, struct bpf_offloaded_map, map);
}

static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
{
        return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
}

static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
{
        return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
                map->ops->map_seq_show_elem;
}

int map_check_no_btf(const struct bpf_map *map,
                     const struct btf *btf,
                     const struct btf_type *key_type,
                     const struct btf_type *value_type);

bool bpf_map_meta_equal(const struct bpf_map *meta0,
                        const struct bpf_map *meta1);

extern const struct bpf_map_ops bpf_map_offload_ops;

/* bpf_type_flag contains a set of flags that are applicable to the values of
 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
 * or a memory is read-only. We classify types into two categories: base types
 * and extended types. Extended types are base types combined with a type flag.
 *
 * Currently there are no more than 32 base types in arg_type, ret_type and
 * reg_types.
 */
#define BPF_BASE_TYPE_BITS      8

enum bpf_type_flag {
        /* PTR may be NULL. */
        PTR_MAYBE_NULL          = BIT(0 + BPF_BASE_TYPE_BITS),

        /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
         * compatible with both mutable and immutable memory.
         */
        MEM_RDONLY              = BIT(1 + BPF_BASE_TYPE_BITS),

        /* MEM points to BPF ring buffer reservation. */
        MEM_RINGBUF             = BIT(2 + BPF_BASE_TYPE_BITS),

        /* MEM is in user address space. */
        MEM_USER                = BIT(3 + BPF_BASE_TYPE_BITS),

        /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
         * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
         * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
         * or bpf_this_cpu_ptr(), which will return the pointer corresponding
         * to the specified cpu.
         */
        MEM_PERCPU              = BIT(4 + BPF_BASE_TYPE_BITS),

        /* Indicates that the argument will be released. */
        OBJ_RELEASE             = BIT(5 + BPF_BASE_TYPE_BITS),

        /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
         * unreferenced and referenced kptr loaded from map value using a load
         * instruction, so that they can only be dereferenced but not escape the
         * BPF program into the kernel (i.e. cannot be passed as arguments to
         * kfunc or bpf helpers).
         */
        PTR_UNTRUSTED           = BIT(6 + BPF_BASE_TYPE_BITS),

        MEM_UNINIT              = BIT(7 + BPF_BASE_TYPE_BITS),

        /* DYNPTR points to memory local to the bpf program. */
        DYNPTR_TYPE_LOCAL       = BIT(8 + BPF_BASE_TYPE_BITS),

        /* DYNPTR points to a kernel-produced ringbuf record. */
        DYNPTR_TYPE_RINGBUF     = BIT(9 + BPF_BASE_TYPE_BITS),

        /* Size is known at compile time. */
        MEM_FIXED_SIZE          = BIT(10 + BPF_BASE_TYPE_BITS),

        /* MEM is of an allocated object of type in program BTF. This is used to
         * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
         */
        MEM_ALLOC               = BIT(11 + BPF_BASE_TYPE_BITS),

        /* PTR was passed from the kernel in a trusted context, and may be
         * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
         * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
         * PTR_UNTRUSTED refers to a kptr that was read directly from a map
         * without invoking bpf_kptr_xchg(). What we really need to know is
         * whether a pointer is safe to pass to a kfunc or BPF helper function.
         * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
         * helpers, they do not cover all possible instances of unsafe
         * pointers. For example, a pointer that was obtained from walking a
         * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
         * fact that it may be NULL, invalid, etc. This is due to backwards
         * compatibility requirements, as this was the behavior that was first
         * introduced when kptrs were added. The behavior is now considered
         * deprecated, and PTR_UNTRUSTED will eventually be removed.
         *
         * PTR_TRUSTED, on the other hand, is a pointer that the kernel
         * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
         * For example, pointers passed to tracepoint arguments are considered
         * PTR_TRUSTED, as are pointers that are passed to struct_ops
         * callbacks. As alluded to above, pointers that are obtained from
         * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
         * struct task_struct *task is PTR_TRUSTED, then accessing
         * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
         * in a BPF register. Similarly, pointers passed to certain programs
         * types such as kretprobes are not guaranteed to be valid, as they may
         * for example contain an object that was recently freed.
         */
        PTR_TRUSTED             = BIT(12 + BPF_BASE_TYPE_BITS),

        /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
        MEM_RCU                 = BIT(13 + BPF_BASE_TYPE_BITS),

        /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
         * Currently only valid for linked-list and rbtree nodes.
         */
        NON_OWN_REF             = BIT(14 + BPF_BASE_TYPE_BITS),

        /* DYNPTR points to sk_buff */
        DYNPTR_TYPE_SKB         = BIT(15 + BPF_BASE_TYPE_BITS),

        /* DYNPTR points to xdp_buff */
        DYNPTR_TYPE_XDP         = BIT(16 + BPF_BASE_TYPE_BITS),

        __BPF_TYPE_FLAG_MAX,
        __BPF_TYPE_LAST_FLAG    = __BPF_TYPE_FLAG_MAX - 1,
};

#define DYNPTR_TYPE_FLAG_MASK   (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
                                 | DYNPTR_TYPE_XDP)

/* Max number of base types. */
#define BPF_BASE_TYPE_LIMIT     (1UL << BPF_BASE_TYPE_BITS)

/* Max number of all types. */
#define BPF_TYPE_LIMIT          (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))

/* function argument constraints */
enum bpf_arg_type {
        ARG_DONTCARE = 0,       /* unused argument in helper function */

        /* the following constraints used to prototype
         * bpf_map_lookup/update/delete_elem() functions
         */
        ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
        ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
        ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */

        /* Used to prototype bpf_memcmp() and other functions that access data
         * on eBPF program stack
         */
        ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */

        ARG_CONST_SIZE,         /* number of bytes accessed from memory */
        ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */

        ARG_PTR_TO_CTX,         /* pointer to context */
        ARG_ANYTHING,           /* any (initialized) argument is ok */
        ARG_PTR_TO_SPIN_LOCK,   /* pointer to bpf_spin_lock */
        ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
        ARG_PTR_TO_INT,         /* pointer to int */
        ARG_PTR_TO_LONG,        /* pointer to long */
        ARG_PTR_TO_SOCKET,      /* pointer to bpf_sock (fullsock) */
        ARG_PTR_TO_BTF_ID,      /* pointer to in-kernel struct */
        ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
        ARG_CONST_ALLOC_SIZE_OR_ZERO,   /* number of allocated bytes requested */
        ARG_PTR_TO_BTF_ID_SOCK_COMMON,  /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
        ARG_PTR_TO_PERCPU_BTF_ID,       /* pointer to in-kernel percpu type */
        ARG_PTR_TO_FUNC,        /* pointer to a bpf program function */
        ARG_PTR_TO_STACK,       /* pointer to stack */
        ARG_PTR_TO_CONST_STR,   /* pointer to a null terminated read-only string */
        ARG_PTR_TO_TIMER,       /* pointer to bpf_timer */
        ARG_PTR_TO_KPTR,        /* pointer to referenced kptr */
        ARG_PTR_TO_DYNPTR,      /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
        __BPF_ARG_TYPE_MAX,

        /* Extended arg_types. */
        ARG_PTR_TO_MAP_VALUE_OR_NULL    = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
        ARG_PTR_TO_MEM_OR_NULL          = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
        ARG_PTR_TO_CTX_OR_NULL          = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
        ARG_PTR_TO_SOCKET_OR_NULL       = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
        ARG_PTR_TO_STACK_OR_NULL        = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
        ARG_PTR_TO_BTF_ID_OR_NULL       = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
        /* pointer to memory does not need to be initialized, helper function must fill
         * all bytes or clear them in error case.
         */
        ARG_PTR_TO_UNINIT_MEM           = MEM_UNINIT | ARG_PTR_TO_MEM,
        /* Pointer to valid memory of size known at compile time. */
        ARG_PTR_TO_FIXED_SIZE_MEM       = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,

        /* This must be the last entry. Its purpose is to ensure the enum is
         * wide enough to hold the higher bits reserved for bpf_type_flag.
         */
        __BPF_ARG_TYPE_LIMIT    = BPF_TYPE_LIMIT,
};
static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);

/* type of values returned from helper functions */
enum bpf_return_type {
        RET_INTEGER,                    /* function returns integer */
        RET_VOID,                       /* function doesn't return anything */
        RET_PTR_TO_MAP_VALUE,           /* returns a pointer to map elem value */
        RET_PTR_TO_SOCKET,              /* returns a pointer to a socket */
        RET_PTR_TO_TCP_SOCK,            /* returns a pointer to a tcp_sock */
        RET_PTR_TO_SOCK_COMMON,         /* returns a pointer to a sock_common */
        RET_PTR_TO_MEM,                 /* returns a pointer to memory */
        RET_PTR_TO_MEM_OR_BTF_ID,       /* returns a pointer to a valid memory or a btf_id */
        RET_PTR_TO_BTF_ID,              /* returns a pointer to a btf_id */
        __BPF_RET_TYPE_MAX,

        /* Extended ret_types. */
        RET_PTR_TO_MAP_VALUE_OR_NULL    = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
        RET_PTR_TO_SOCKET_OR_NULL       = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
        RET_PTR_TO_TCP_SOCK_OR_NULL     = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
        RET_PTR_TO_SOCK_COMMON_OR_NULL  = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
        RET_PTR_TO_RINGBUF_MEM_OR_NULL  = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
        RET_PTR_TO_DYNPTR_MEM_OR_NULL   = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
        RET_PTR_TO_BTF_ID_OR_NULL       = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
        RET_PTR_TO_BTF_ID_TRUSTED       = PTR_TRUSTED    | RET_PTR_TO_BTF_ID,

        /* This must be the last entry. Its purpose is to ensure the enum is
         * wide enough to hold the higher bits reserved for bpf_type_flag.
         */
        __BPF_RET_TYPE_LIMIT    = BPF_TYPE_LIMIT,
};
static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);

/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 * instructions after verifying
 */
struct bpf_func_proto {
        u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
        bool gpl_only;
        bool pkt_access;
        bool might_sleep;
        enum bpf_return_type ret_type;
        union {
                struct {
                        enum bpf_arg_type arg1_type;
                        enum bpf_arg_type arg2_type;
                        enum bpf_arg_type arg3_type;
                        enum bpf_arg_type arg4_type;
                        enum bpf_arg_type arg5_type;
                };
                enum bpf_arg_type arg_type[5];
        };
        union {
                struct {
                        u32 *arg1_btf_id;
                        u32 *arg2_btf_id;
                        u32 *arg3_btf_id;
                        u32 *arg4_btf_id;
                        u32 *arg5_btf_id;
                };
                u32 *arg_btf_id[5];
                struct {
                        size_t arg1_size;
                        size_t arg2_size;
                        size_t arg3_size;
                        size_t arg4_size;
                        size_t arg5_size;
                };
                size_t arg_size[5];
        };
        int *ret_btf_id; /* return value btf_id */
        bool (*allowed)(const struct bpf_prog *prog);
};

/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
 * the first argument to eBPF programs.
 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
 */
struct bpf_context;

enum bpf_access_type {
        BPF_READ = 1,
        BPF_WRITE = 2
};

/* types of values stored in eBPF registers */
/* Pointer types represent:
 * pointer
 * pointer + imm
 * pointer + (u16) var
 * pointer + (u16) var + imm
 * if (range > 0) then [ptr, ptr + range - off) is safe to access
 * if (id > 0) means that some 'var' was added
 * if (off > 0) means that 'imm' was added
 */
enum bpf_reg_type {
        NOT_INIT = 0,            /* nothing was written into register */
        SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
        PTR_TO_CTX,              /* reg points to bpf_context */
        CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
        PTR_TO_MAP_VALUE,        /* reg points to map element value */
        PTR_TO_MAP_KEY,          /* reg points to a map element key */
        PTR_TO_STACK,            /* reg == frame_pointer + offset */
        PTR_TO_PACKET_META,      /* skb->data - meta_len */
        PTR_TO_PACKET,           /* reg points to skb->data */
        PTR_TO_PACKET_END,       /* skb->data + headlen */
        PTR_TO_FLOW_KEYS,        /* reg points to bpf_flow_keys */
        PTR_TO_SOCKET,           /* reg points to struct bpf_sock */
        PTR_TO_SOCK_COMMON,      /* reg points to sock_common */
        PTR_TO_TCP_SOCK,         /* reg points to struct tcp_sock */
        PTR_TO_TP_BUFFER,        /* reg points to a writable raw tp's buffer */
        PTR_TO_XDP_SOCK,         /* reg points to struct xdp_sock */
        /* PTR_TO_BTF_ID points to a kernel struct that does not need
         * to be null checked by the BPF program. This does not imply the
         * pointer is _not_ null and in practice this can easily be a null
         * pointer when reading pointer chains. The assumption is program
         * context will handle null pointer dereference typically via fault
         * handling. The verifier must keep this in mind and can make no
         * assumptions about null or non-null when doing branch analysis.
         * Further, when passed into helpers the helpers can not, without
         * additional context, assume the value is non-null.
         */
        PTR_TO_BTF_ID,
        /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
         * been checked for null. Used primarily to inform the verifier
         * an explicit null check is required for this struct.
         */
        PTR_TO_MEM,              /* reg points to valid memory region */
        PTR_TO_BUF,              /* reg points to a read/write buffer */
        PTR_TO_FUNC,             /* reg points to a bpf program function */
        CONST_PTR_TO_DYNPTR,     /* reg points to a const struct bpf_dynptr */
        __BPF_REG_TYPE_MAX,

        /* Extended reg_types. */
        PTR_TO_MAP_VALUE_OR_NULL        = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
        PTR_TO_SOCKET_OR_NULL           = PTR_MAYBE_NULL | PTR_TO_SOCKET,
        PTR_TO_SOCK_COMMON_OR_NULL      = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
        PTR_TO_TCP_SOCK_OR_NULL         = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
        PTR_TO_BTF_ID_OR_NULL           = PTR_MAYBE_NULL | PTR_TO_BTF_ID,

        /* This must be the last entry. Its purpose is to ensure the enum is
         * wide enough to hold the higher bits reserved for bpf_type_flag.
         */
        __BPF_REG_TYPE_LIMIT    = BPF_TYPE_LIMIT,
};
static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);

/* The information passed from prog-specific *_is_valid_access
 * back to the verifier.
 */
struct bpf_insn_access_aux {
        enum bpf_reg_type reg_type;
        union {
                int ctx_field_size;
                struct {
                        struct btf *btf;
                        u32 btf_id;
                };
        };
        struct bpf_verifier_log *log; /* for verbose logs */
};

static inline void
bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
{
        aux->ctx_field_size = size;
}

static 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_reg_state;
struct bpf_verifier_ops {
        /* return eBPF function prototype for verification */
        const struct bpf_func_proto *
        (*get_func_proto)(enum bpf_func_id func_id,
                          const struct bpf_prog *prog);

        /* return true if 'size' wide access at offset 'off' within bpf_context
         * with 'type' (read or write) is allowed
         */
        bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
                                const struct bpf_prog *prog,
                                struct bpf_insn_access_aux *info);
        int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
                            const struct bpf_prog *prog);
        int (*gen_ld_abs)(const struct bpf_insn *orig,
                          struct bpf_insn *insn_buf);
        u32 (*convert_ctx_access)(enum bpf_access_type type,
                                  const struct bpf_insn *src,
                                  struct bpf_insn *dst,
                                  struct bpf_prog *prog, u32 *target_size);
        int (*btf_struct_access)(struct bpf_verifier_log *log,
                                 const struct bpf_reg_state *reg,
                                 int off, int size, 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

/* The argument is a structure. */
#define BTF_FMODEL_STRUCT_ARG           BIT(0)

/* The argument is signed. */
#define BTF_FMODEL_SIGNED_ARG           BIT(1)

struct btf_func_model {
        u8 ret_size;
        u8 ret_flags;
        u8 nr_args;
        u8 arg_size[MAX_BPF_FUNC_ARGS];
        u8 arg_flags[MAX_BPF_FUNC_ARGS];
};

/* Restore arguments before returning from trampoline to let original function
 * continue executing. This flag is used for fentry progs when there are no
 * fexit progs.
 */
#define BPF_TRAMP_F_RESTORE_REGS        BIT(0)
/* Call original function after fentry progs, but before fexit progs.
 * Makes sense for fentry/fexit, normal calls and indirect calls.
 */
#define BPF_TRAMP_F_CALL_ORIG           BIT(1)
/* Skip current frame and return to parent.  Makes sense for fentry/fexit
 * programs only. Should not be used with normal calls and indirect calls.
 */
#define BPF_TRAMP_F_SKIP_FRAME          BIT(2)
/* Store IP address of the caller on the trampoline stack,
 * so it's available for trampoline's programs.
 */
#define BPF_TRAMP_F_IP_ARG              BIT(3)
/* Return the return value of fentry prog. Only used by bpf_struct_ops. */
#define BPF_TRAMP_F_RET_FENTRY_RET      BIT(4)

/* Get original function from stack instead of from provided direct address.
 * Makes sense for trampolines with fexit or fmod_ret programs.
 */
#define BPF_TRAMP_F_ORIG_STACK          BIT(5)

/* This trampoline is on a function with another ftrace_ops with IPMODIFY,
 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
 */
#define BPF_TRAMP_F_SHARE_IPMODIFY      BIT(6)

/* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
 * bytes on x86.
 */
enum {
#if defined(__s390x__)
        BPF_MAX_TRAMP_LINKS = 27,
#else
        BPF_MAX_TRAMP_LINKS = 38,
#endif
};

struct bpf_tramp_links {
        struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
        int nr_links;
};

struct bpf_tramp_run_ctx;

/* Different use cases for BPF trampoline:
 * 1. replace nop at the function entry (kprobe equivalent)
 *    flags = BPF_TRAMP_F_RESTORE_REGS
 *    fentry = a set of programs to run before returning from trampoline
 *
 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
 *    flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
 *    orig_call = fentry_ip + MCOUNT_INSN_SIZE
 *    fentry = a set of program to run before calling original function
 *    fexit = a set of program to run after original function
 *
 * 3. replace direct call instruction anywhere in the function body
 *    or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
 *    With flags = 0
 *      fentry = a set of programs to run before returning from trampoline
 *    With flags = BPF_TRAMP_F_CALL_ORIG
 *      orig_call = original callback addr or direct function addr
 *      fentry = a set of program to run before calling original function
 *      fexit = a set of program to run after original function
 */
struct bpf_tramp_image;
int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
                                const struct btf_func_model *m, u32 flags,
                                struct bpf_tramp_links *tlinks,
                                void *orig_call);
u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
                                             struct bpf_tramp_run_ctx *run_ctx);
void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
                                             struct bpf_tramp_run_ctx *run_ctx);
void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
                                      struct bpf_tramp_run_ctx *run_ctx);
typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
                                      struct bpf_tramp_run_ctx *run_ctx);
bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);

struct bpf_ksym {
        unsigned long            start;
        unsigned long            end;
        char                     name[KSYM_NAME_LEN];
        struct list_head         lnode;
        struct latch_tree_node   tnode;
        bool                     prog;
};

enum bpf_tramp_prog_type {
        BPF_TRAMP_FENTRY,
        BPF_TRAMP_FEXIT,
        BPF_TRAMP_MODIFY_RETURN,
        BPF_TRAMP_MAX,
        BPF_TRAMP_REPLACE, /* more than MAX */
};

struct bpf_tramp_image {
        void *image;
        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;
        void *rw_image;
        u32 image_off;
        struct bpf_ksym ksym;
#ifdef CONFIG_HAVE_STATIC_CALL
        struct static_call_key *sc_key;
        void *sc_tramp;
#endif
};

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);
}

/* the implementation of the opaque uapi struct bpf_dynptr */
struct bpf_dynptr_kern {
        void *data;
        /* Size represents the number of usable bytes of dynptr data.
         * If for example the offset is at 4 for a local dynptr whose data is
         * of type u64, the number of usable bytes is 4.
         *
         * The upper 8 bits are reserved. It is as follows:
         * Bits 0 - 23 = size
         * Bits 24 - 30 = dynptr type
         * Bit 31 = whether dynptr is read-only
         */
        u32 size;
        u32 offset;
} __aligned(8);

enum bpf_dynptr_type {
        BPF_DYNPTR_TYPE_INVALID,
        /* Points to memory that is local to the bpf program */
        BPF_DYNPTR_TYPE_LOCAL,
        /* Underlying data is a ringbuf record */
        BPF_DYNPTR_TYPE_RINGBUF,
        /* Underlying data is a sk_buff */
        BPF_DYNPTR_TYPE_SKB,
        /* Underlying data is a xdp_buff */
        BPF_DYNPTR_TYPE_XDP,
};

int bpf_dynptr_check_size(u32 size);
u32 bpf_dynptr_get_size(const struct bpf_dynptr_kern *ptr);

#ifdef CONFIG_BPF_JIT
int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
struct bpf_trampoline *bpf_trampoline_get(u64 key,
                                          struct bpf_attach_target_info *tgt_info);
void bpf_trampoline_put(struct bpf_trampoline *tr);
int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);

/*
 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
 * indirection with a direct call to the bpf program. If the architecture does
 * not have STATIC_CALL, avoid a double-indirection.
 */
#ifdef CONFIG_HAVE_STATIC_CALL

#define __BPF_DISPATCHER_SC_INIT(_name)                         \
        .sc_key = &STATIC_CALL_KEY(_name),                      \
        .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),

#define __BPF_DISPATCHER_SC(name)                               \
        DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)

#define __BPF_DISPATCHER_CALL(name)                             \
        static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)

#define __BPF_DISPATCHER_UPDATE(_d, _new)                       \
        __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))

#else
#define __BPF_DISPATCHER_SC_INIT(name)
#define __BPF_DISPATCHER_SC(name)
#define __BPF_DISPATCHER_CALL(name)             bpf_func(ctx, insnsi)
#define __BPF_DISPATCHER_UPDATE(_d, _new)
#endif

#define BPF_DISPATCHER_INIT(_name) {                            \
        .mutex = __MUTEX_INITIALIZER(_name.mutex),              \
        .func = &_name##_func,                                  \
        .progs = {},                                            \
        .num_progs = 0,                                         \
        .image = NULL,                                          \
        .image_off = 0,                                         \
        .ksym = {                                               \
                .name  = #_name,                                \
                .lnode = LIST_HEAD_INIT(_name.ksym.lnode),      \
        },                                                      \
        __BPF_DISPATCHER_SC_INIT(_name##_call)                  \
}

#define DEFINE_BPF_DISPATCHER(name)                                     \
        __BPF_DISPATCHER_SC(name);                                      \
        noinline __nocfi unsigned int bpf_dispatcher_##name##_func(     \
                const void *ctx,                                        \
                const struct bpf_insn *insnsi,                          \
                bpf_func_t bpf_func)                                    \
        {                                                               \
                return __BPF_DISPATCHER_CALL(name);                     \
        }                                                               \
        EXPORT_SYMBOL(bpf_dispatcher_##name##_func);                    \
        struct bpf_dispatcher bpf_dispatcher_##name =                   \
                BPF_DISPATCHER_INIT(bpf_dispatcher_##name);

#define DECLARE_BPF_DISPATCHER(name)                                    \
        unsigned int bpf_dispatcher_##name##_func(                      \
                const void *ctx,                                        \
                const struct bpf_insn *insnsi,                          \
                bpf_func_t bpf_func);                                   \
        extern struct bpf_dispatcher bpf_dispatcher_##name;

#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
#define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
                                struct bpf_prog *to);
/* Called only from JIT-enabled code, so there's no need for stubs. */
void bpf_image_ksym_add(void *data, 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 dev_bound; /* Program is bound to the netdev. */
        bool offload_requested; /* Program is bound and offloaded to the netdev. */
        bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
        bool 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,
                            const struct bpf_prog *prog);
        int (*init_member)(const struct btf_type *t,
                           const struct btf_member *member,
                           void *kdata, const void *udata);
        int (*reg)(void *kdata);
        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 (*test_sleepable)(struct bpf_dummy_ops_state *cb);
};

int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
                            union bpf_attr __user *uattr);
#endif
#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 {
                DECLARE_FLEX_ARRAY(char, value) __aligned(8);
                DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
                DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
        };
};

#define BPF_COMPLEXITY_LIMIT_INSNS      1000000 /* yes. 1M insns */
#define MAX_TAIL_CALL_CNT 33

/* Maximum number of loops for bpf_loop */
#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)

/* Maximum number of user-producer ring buffer samples that can be drained in
 * a call to bpf_user_ringbuf_drain().
 */
#define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)

static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
{
        u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);

        /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
         * not possible.
         */
        if (access_flags & BPF_F_RDONLY_PROG)
                return BPF_MAP_CAN_READ;
        else if (access_flags & BPF_F_WRONLY_PROG)
                return BPF_MAP_CAN_WRITE;
        else
                return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
}

static inline bool bpf_map_flags_access_ok(u32 access_flags)
{
        return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
               (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
}

struct bpf_event_entry {
        struct perf_event *event;
        struct file *perf_file;
        struct file *map_file;
        struct rcu_head rcu;
};

static inline bool map_type_contains_progs(struct bpf_map *map)
{
        return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
               map->map_type == BPF_MAP_TYPE_DEVMAP ||
               map->map_type == BPF_MAP_TYPE_CPUMAP;
}

bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
int bpf_prog_calc_tag(struct bpf_prog *fp);

const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);

typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
                                        unsigned long off, unsigned long len);
typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
                                        const struct bpf_insn *src,
                                        struct bpf_insn *dst,
                                        struct bpf_prog *prog,
                                        u32 *target_size);

u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
                     void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);

/* an array of programs to be executed under rcu_lock.
 *
 * Typical usage:
 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
 *
 * the structure returned by bpf_prog_array_alloc() should be populated
 * with program pointers and the last pointer must be NULL.
 * The user has to keep refcnt on the program and make sure the program
 * is removed from the array before bpf_prog_put().
 * The 'struct bpf_prog_array *' should only be replaced with xchg()
 * since other cpus are walking the array of pointers in parallel.
 */
struct bpf_prog_array_item {
        struct bpf_prog *prog;
        union {
                struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
                u64 bpf_cookie;
        };
};

struct bpf_prog_array {
        struct rcu_head rcu;
        struct bpf_prog_array_item items[];
};

struct bpf_empty_prog_array {
        struct bpf_prog_array hdr;
        struct bpf_prog *null_prog;
};

/* to avoid allocating empty bpf_prog_array for cgroups that
 * don't have bpf program attached use one global 'bpf_empty_prog_array'
 * It will not be modified the caller of bpf_prog_array_alloc()
 * (since caller requested prog_cnt == 0)
 * that pointer should be 'freed' by bpf_prog_array_free()
 */
extern struct bpf_empty_prog_array bpf_empty_prog_array;

struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
void bpf_prog_array_free(struct bpf_prog_array *progs);
/* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
int bpf_prog_array_length(struct bpf_prog_array *progs);
bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
                                __u32 __user *prog_ids, u32 cnt);

void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
                                struct bpf_prog *old_prog);
int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
                             struct bpf_prog *prog);
int bpf_prog_array_copy_info(struct bpf_prog_array *array,
                             u32 *prog_ids, u32 request_cnt,
                             u32 *prog_cnt);
int bpf_prog_array_copy(struct bpf_prog_array *old_array,
                        struct bpf_prog *exclude_prog,
                        struct bpf_prog *include_prog,
                        u64 bpf_cookie,
                        struct bpf_prog_array **new_array);

struct bpf_run_ctx {};

struct bpf_cg_run_ctx {
        struct bpf_run_ctx run_ctx;
        const struct bpf_prog_array_item *prog_item;
        int retval;
};

struct bpf_trace_run_ctx {
        struct bpf_run_ctx run_ctx;
        u64 bpf_cookie;
};

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);
void bpf_map_free_id(struct bpf_map *map);

struct btf_field *btf_record_find(const struct btf_record *rec,
                                  u32 offset, enum btf_field_type type);
void btf_record_free(struct btf_record *rec);
void bpf_map_free_record(struct bpf_map *map);
struct btf_record *btf_record_dup(const struct btf_record *rec);
bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
void bpf_obj_free_fields(const struct btf_record *rec, void *obj);

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, struct file *map_file,
                              const union bpf_attr *attr,
                              union bpf_attr __user *uattr);
int  generic_map_delete_batch(struct bpf_map *map,
                              const union bpf_attr *attr,
                              union bpf_attr __user *uattr);
struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);

#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 *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
                       gfp_t flags);
void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
                                    size_t align, gfp_t flags);
#else
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 *
bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, gfp_t flags)
{
        return kvcalloc(n, 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_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; }

/*
 * The task type of iterators.
 *
 * For BPF task iterators, they can be parameterized with various
 * parameters to visit only some of tasks.
 *
 * BPF_TASK_ITER_ALL (default)
 *      Iterate over resources of every task.
 *
 * BPF_TASK_ITER_TID
 *      Iterate over resources of a task/tid.
 *
 * BPF_TASK_ITER_TGID
 *      Iterate over resources of every task of a process / task group.
 */
enum bpf_iter_task_type {
        BPF_TASK_ITER_ALL = 0,
        BPF_TASK_ITER_TID,
        BPF_TASK_ITER_TGID,
};

struct bpf_iter_aux_info {
        /* for map_elem iter */
        struct bpf_map *map;

        /* for cgroup iter */
        struct {
                struct cgroup *start; /* starting cgroup */
                enum bpf_cgroup_iter_order order;
        } cgroup;
        struct {
                enum bpf_iter_task_type type;
                u32 pid;
        } task;
};

typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
                                        union bpf_iter_link_info *linfo,
                                        struct bpf_iter_aux_info *aux);
typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
                                        struct seq_file *seq);
typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
                                         struct bpf_link_info *info);
typedef const struct bpf_func_proto *
(*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
                             const struct bpf_prog *prog);

enum bpf_iter_feature {
        BPF_ITER_RESCHED        = BIT(0),
};

#define BPF_ITER_CTX_ARG_MAX 2
struct bpf_iter_reg {
        const char *target;
        bpf_iter_attach_target_t attach_target;
        bpf_iter_detach_target_t detach_target;
        bpf_iter_show_fdinfo_t show_fdinfo;
        bpf_iter_fill_link_info_t fill_link_info;
        bpf_iter_get_func_proto_t get_func_proto;
        u32 ctx_arg_info_size;
        u32 feature;
        struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
        const struct bpf_iter_seq_info *seq_info;
};

struct bpf_iter_meta {
        __bpf_md_ptr(struct seq_file *, seq);
        u64 session_id;
        u64 seq_num;
};

struct bpf_iter__bpf_map_elem {
        __bpf_md_ptr(struct bpf_iter_meta *, meta);
        __bpf_md_ptr(struct bpf_map *, map);
        __bpf_md_ptr(void *, key);
        __bpf_md_ptr(void *, value);
};

int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
bool bpf_iter_prog_supported(struct bpf_prog *prog);
const struct bpf_func_proto *
bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
int bpf_iter_new_fd(struct bpf_link *link);
bool bpf_link_is_iter(struct bpf_link *link);
struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
                              struct seq_file *seq);
int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
                                struct bpf_link_info *info);

int map_set_for_each_callback_args(struct bpf_verifier_env *env,
                                   struct bpf_func_state *caller,
                                   struct bpf_func_state *callee);

int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
                           u64 flags);
int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
                            u64 flags);

int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);

int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
                                 void *key, void *value, u64 map_flags);
int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
                                void *key, void *value, u64 map_flags);
int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);

int bpf_get_file_flag(int flags);
int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
                             size_t actual_size);

/* verify correctness of eBPF program */
int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr);

#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 bpf_reg_state *reg,
                      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_subprog_call(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);
void bpf_task_storage_free(struct task_struct *task);
void bpf_cgrp_storage_free(struct cgroup *cgroup);
bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
const struct btf_func_model *
bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
                         const struct bpf_insn *insn);
struct bpf_core_ctx {
        struct bpf_verifier_log *log;
        const struct btf *btf;
};

bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
                                const struct bpf_reg_state *reg,
                                int off, const char *suffix);

bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
                               const struct btf *reg_btf, u32 reg_id,
                               const struct btf *arg_btf, u32 arg_id);

int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
                   int relo_idx, void *insn);

static inline bool unprivileged_ebpf_enabled(void)
{
        return !sysctl_unprivileged_bpf_disabled;
}

/* Not all bpf prog type has the bpf_ctx.
 * For the bpf prog type that has initialized the bpf_ctx,
 * this function can be used to decide if a kernel function
 * is called by a bpf program.
 */
static inline bool has_current_bpf_ctx(void)
{
        return !!current->bpf_ctx;
}

void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);

void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
                     enum bpf_dynptr_type type, u32 offset, u32 size);
void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
#else /* !CONFIG_BPF_SYSCALL */
static inline struct bpf_prog *bpf_prog_get(u32 ufd)
{
        return ERR_PTR(-EOPNOTSUPP);
}

static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
                                                     enum bpf_prog_type type,
                                                     bool attach_drv)
{
        return ERR_PTR(-EOPNOTSUPP);
}

static inline void bpf_prog_add(struct bpf_prog *prog, int i)
{
}

static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
{
}

static inline void bpf_prog_put(struct bpf_prog *prog)
{
}

static inline void bpf_prog_inc(struct bpf_prog *prog)
{
}

static inline struct bpf_prog *__must_check
bpf_prog_inc_not_zero(struct bpf_prog *prog)
{
        return ERR_PTR(-EOPNOTSUPP);
}

static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
                                 const struct bpf_link_ops *ops,
                                 struct bpf_prog *prog)
{
}

static inline int bpf_link_prime(struct bpf_link *link,
                                 struct bpf_link_primer *primer)
{
        return -EOPNOTSUPP;
}

static inline int bpf_link_settle(struct bpf_link_primer *primer)
{
        return -EOPNOTSUPP;
}

static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
{
}

static inline void bpf_link_inc(struct bpf_link *link)
{
}

static inline 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 int btf_struct_access(struct bpf_verifier_log *log,
                                    const struct bpf_reg_state *reg,
                                    int off, int size, enum bpf_access_type atype,
                                    u32 *next_btf_id, enum bpf_type_flag *flag)
{
        return -EACCES;
}

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;
}

static inline bool has_current_bpf_ctx(void)
{
        return false;
}

static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
{
}

static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
{
}

static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
                                   enum bpf_dynptr_type type, u32 offset, u32 size)
{
}

static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
{
}

static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
{
}
#endif /* CONFIG_BPF_SYSCALL */

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_dev_bound_destroy(struct bpf_prog *prog);
int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
                               struct bpf_prog *prog);

int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);

int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
int bpf_map_offload_update_elem(struct bpf_map *map,
                                void *key, void *value, u64 flags);
int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
int bpf_map_offload_get_next_key(struct bpf_map *map,
                                 void *key, void *next_key);

bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);

struct bpf_offload_dev *
bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
                                    struct net_device *netdev);
void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
                                       struct net_device *netdev);
bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);

void unpriv_ebpf_notify(int new_state);

#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
                              struct bpf_prog_aux *prog_aux);
void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
void bpf_dev_bound_netdev_unregister(struct net_device *dev);

static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
{
        return aux->dev_bound;
}

static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
{
        return aux->offload_requested;
}

bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);

static inline bool bpf_map_is_offloaded(struct bpf_map *map)
{
        return unlikely(map->ops == &bpf_map_offload_ops);
}

struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
void bpf_map_offload_map_free(struct bpf_map *map);
u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
int bpf_prog_test_run_syscall(struct bpf_prog *prog,
                              const union bpf_attr *kattr,
                              union bpf_attr __user *uattr);

int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
int sock_map_bpf_prog_query(const union bpf_attr *attr,
                            union bpf_attr __user *uattr);

void sock_map_unhash(struct sock *sk);
void sock_map_destroy(struct sock *sk);
void sock_map_close(struct sock *sk, long timeout);
#else
static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
                                            struct bpf_prog_aux *prog_aux)
{
        return -EOPNOTSUPP;
}

static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
                                                u32 func_id)
{
        return NULL;
}

static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
                                          union bpf_attr *attr)
{
        return -EOPNOTSUPP;
}

static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
                                             struct bpf_prog *old_prog)
{
        return -EOPNOTSUPP;
}

static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
{
}

static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
{
        return false;
}

static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
{
        return false;
}

static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
{
        return false;
}

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

static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
{
        return ERR_PTR(-EOPNOTSUPP);
}

static inline void bpf_map_offload_map_free(struct bpf_map *map)
{
}

static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
{
        return 0;
}

static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
                                            const union bpf_attr *kattr,
                                            union bpf_attr __user *uattr)
{
        return -ENOTSUPP;
}

#ifdef CONFIG_BPF_SYSCALL
static inline int sock_map_get_from_fd(const union bpf_attr *attr,
                                       struct bpf_prog *prog)
{
        return -EINVAL;
}

static inline int sock_map_prog_detach(const union bpf_attr *attr,
                                       enum bpf_prog_type ptype)
{
        return -EOPNOTSUPP;
}

static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
                                           u64 flags)
{
        return -EOPNOTSUPP;
}

static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
                                          union bpf_attr __user *uattr)
{
        return -EINVAL;
}
#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_ktime_get_tai_ns_proto;
extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
extern const struct bpf_func_proto bpf_get_current_comm_proto;
extern const struct bpf_func_proto bpf_get_stackid_proto;
extern const struct bpf_func_proto bpf_get_stack_proto;
extern const struct bpf_func_proto bpf_get_task_stack_proto;
extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
extern const struct bpf_func_proto bpf_get_stack_proto_pe;
extern const struct bpf_func_proto bpf_sock_map_update_proto;
extern const struct bpf_func_proto bpf_sock_hash_update_proto;
extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
extern const struct bpf_func_proto bpf_spin_lock_proto;
extern const struct bpf_func_proto bpf_spin_unlock_proto;
extern const struct bpf_func_proto bpf_get_local_storage_proto;
extern const struct bpf_func_proto bpf_strtol_proto;
extern const struct bpf_func_proto bpf_strtoul_proto;
extern const struct bpf_func_proto bpf_tcp_sock_proto;
extern const struct bpf_func_proto bpf_jiffies64_proto;
extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
extern const struct bpf_func_proto bpf_event_output_data_proto;
extern const struct bpf_func_proto bpf_ringbuf_output_proto;
extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
extern const struct bpf_func_proto bpf_ringbuf_query_proto;
extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
extern const struct bpf_func_proto bpf_copy_from_user_proto;
extern const struct bpf_func_proto bpf_snprintf_btf_proto;
extern const struct bpf_func_proto bpf_snprintf_proto;
extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
extern const struct bpf_func_proto bpf_sock_from_file_proto;
extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
extern const struct bpf_func_proto bpf_task_storage_get_proto;
extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
extern const struct bpf_func_proto bpf_task_storage_delete_proto;
extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
extern const struct bpf_func_proto bpf_find_vma_proto;
extern const struct bpf_func_proto bpf_loop_proto;
extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
extern const struct bpf_func_proto bpf_set_retval_proto;
extern const struct bpf_func_proto bpf_get_retval_proto;
extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;

const struct bpf_func_proto *tracing_prog_func_proto(
  enum bpf_func_id func_id, const struct bpf_prog *prog);

/* Shared helpers among cBPF and eBPF. */
void bpf_user_rnd_init_once(void);
u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);

#if defined(CONFIG_NET)
bool bpf_sock_common_is_valid_access(int off, int size,
                                     enum bpf_access_type type,
                                     struct bpf_insn_access_aux *info);
bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
                              struct bpf_insn_access_aux *info);
u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
                                const struct bpf_insn *si,
                                struct bpf_insn *insn_buf,
                                struct bpf_prog *prog,
                                u32 *target_size);
int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
                               struct bpf_dynptr_kern *ptr);
#else
static inline bool bpf_sock_common_is_valid_access(int off, int size,
                                                   enum bpf_access_type type,
                                                   struct bpf_insn_access_aux *info)
{
        return false;
}
static inline bool bpf_sock_is_valid_access(int off, int size,
                                            enum bpf_access_type type,
                                            struct bpf_insn_access_aux *info)
{
        return false;
}
static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
                                              const struct bpf_insn *si,
                                              struct bpf_insn *insn_buf,
                                              struct bpf_prog *prog,
                                              u32 *target_size)
{
        return 0;
}
static inline int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
                                             struct bpf_dynptr_kern *ptr)
{
        return -EOPNOTSUPP;
}
#endif

#ifdef CONFIG_INET
struct sk_reuseport_kern {
        struct sk_buff *skb;
        struct sock *sk;
        struct sock *selected_sk;
        struct sock *migrating_sk;
        void *data_end;
        u32 hash;
        u32 reuseport_id;
        bool bind_inany;
};
bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
                                  struct bpf_insn_access_aux *info);

u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
                                    const struct bpf_insn *si,
                                    struct bpf_insn *insn_buf,
                                    struct bpf_prog *prog,
                                    u32 *target_size);

bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
                                  struct bpf_insn_access_aux *info);

u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
                                    const struct bpf_insn *si,
                                    struct bpf_insn *insn_buf,
                                    struct bpf_prog *prog,
                                    u32 *target_size);
#else
static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
                                                enum bpf_access_type type,
                                                struct bpf_insn_access_aux *info)
{
        return false;
}

static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
                                                  const struct bpf_insn *si,
                                                  struct bpf_insn *insn_buf,
                                                  struct bpf_prog *prog,
                                                  u32 *target_size)
{
        return 0;
}
static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
                                                enum bpf_access_type type,
                                                struct bpf_insn_access_aux *info)
{
        return false;
}

static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
                                                  const struct bpf_insn *si,
                                                  struct bpf_insn *insn_buf,
                                                  struct bpf_prog *prog,
                                                  u32 *target_size)
{
        return 0;
}
#endif /* CONFIG_INET */

enum bpf_text_poke_type {
        BPF_MOD_CALL,
        BPF_MOD_JUMP,
};

int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
                       void *addr1, void *addr2);

void *bpf_arch_text_copy(void *dst, void *src, size_t len);
int bpf_arch_text_invalidate(void *dst, size_t len);

struct btf_id_set;
bool btf_id_set_contains(const struct btf_id_set *set, u32 id);

#define MAX_BPRINTF_VARARGS             12
#define MAX_BPRINTF_BUF                 1024

struct bpf_bprintf_data {
        u32 *bin_args;
        char *buf;
        bool get_bin_args;
        bool get_buf;
};

int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
                        u32 num_args, struct bpf_bprintf_data *data);
void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);

#ifdef CONFIG_BPF_LSM
void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
void bpf_cgroup_atype_put(int cgroup_atype);
#else
static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
#endif /* CONFIG_BPF_LSM */

struct key;

#ifdef CONFIG_KEYS
struct bpf_key {
        struct key *key;
        bool has_ref;
};
#endif /* CONFIG_KEYS */

static inline bool type_is_alloc(u32 type)
{
        return type & MEM_ALLOC;
}

static inline gfp_t bpf_memcg_flags(gfp_t flags)
{
        if (memcg_bpf_enabled())
                return flags | __GFP_ACCOUNT;
        return flags;
}

#endif /* _LINUX_BPF_H */