f2fs: fix deadlock between quota writes and checkpoint

[mirror_ubuntu-jammy-kernel.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 <linux/workqueue.h>
#include <linux/file.h>
#include <linux/percpu.h>
#include <linux/err.h>
#include <linux/rbtree_latch.h>
#include <linux/numa.h>
#include <linux/mm_types.h>
#include <linux/wait.h>
#include <linux/u64_stats_sync.h>
#include <linux/refcount.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/capability.h>

struct bpf_verifier_env;
struct bpf_verifier_log;
struct perf_event;
struct bpf_prog;
struct bpf_prog_aux;
struct bpf_map;
struct sock;
struct seq_file;
struct btf;
struct btf_type;
struct exception_table_entry;
struct seq_operations;

extern struct idr btf_idr;
extern spinlock_t btf_idr_lock;

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

        /* funcs callable from userspace and from eBPF programs */
        void *(*map_lookup_elem)(struct bpf_map *map, void *key);
        int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
        int (*map_delete_elem)(struct bpf_map *map, void *key);
        int (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
        int (*map_pop_elem)(struct bpf_map *map, void *value);
        int (*map_peek_elem)(struct bpf_map *map, void *value);

        /* funcs called by prog_array and perf_event_array map */
        void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
                                int fd);
        void (*map_fd_put_ptr)(void *ptr);
        u32 (*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);
};

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

struct bpf_map {
        /* The first two cachelines with read-mostly members of which some
         * are also accessed in fast-path (e.g. ops, max_entries).
         */
        const struct bpf_map_ops *ops ____cacheline_aligned;
        struct bpf_map *inner_map_meta;
#ifdef CONFIG_SECURITY
        void *security;
#endif
        enum bpf_map_type map_type;
        u32 key_size;
        u32 value_size;
        u32 max_entries;
        u32 map_flags;
        int spin_lock_off; /* >=0 valid offset, <0 error */
        u32 id;
        int numa_node;
        u32 btf_key_type_id;
        u32 btf_value_type_id;
        struct btf *btf;
        struct bpf_map_memory memory;
        char name[BPF_OBJ_NAME_LEN];
        u32 btf_vmlinux_value_type_id;
        bool bypass_spec_v1;
        bool frozen; /* write-once; write-protected by freeze_mutex */
        /* 22 bytes hole */

        /* The 3rd and 4th cacheline with misc members to avoid false sharing
         * particularly with refcounting.
         */
        atomic64_t refcnt ____cacheline_aligned;
        atomic64_t usercnt;
        struct work_struct work;
        struct mutex freeze_mutex;
        u64 writecnt; /* writable mmap cnt; protected by freeze_mutex */
};

static inline bool map_value_has_spin_lock(const struct bpf_map *map)
{
        return map->spin_lock_off >= 0;
}

static inline void check_and_init_map_lock(struct bpf_map *map, void *dst)
{
        if (likely(!map_value_has_spin_lock(map)))
                return;
        *(struct bpf_spin_lock *)(dst + map->spin_lock_off) =
                (struct bpf_spin_lock){};
}

/* copy everything but bpf_spin_lock */
static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
{
        if (unlikely(map_value_has_spin_lock(map))) {
                u32 off = map->spin_lock_off;

                memcpy(dst, src, off);
                memcpy(dst + off + sizeof(struct bpf_spin_lock),
                       src + off + sizeof(struct bpf_spin_lock),
                       map->value_size - off - sizeof(struct bpf_spin_lock));
        } else {
                memcpy(dst, src, map->value_size);
        }
}
void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
                           bool lock_src);
int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);

struct bpf_offload_dev;
struct bpf_offloaded_map;

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

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

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

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

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

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

extern const struct bpf_map_ops bpf_map_offload_ops;

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

        /* the following constraints used to prototype
         * bpf_map_lookup/update/delete_elem() functions
         */
        ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
        ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
        ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
        ARG_PTR_TO_UNINIT_MAP_VALUE,    /* pointer to valid memory used to store a map value */
        ARG_PTR_TO_MAP_VALUE_OR_NULL,   /* pointer to stack used as map value or NULL */

        /* the following constraints used to prototype bpf_memcmp() and other
         * functions that access data on eBPF program stack
         */
        ARG_PTR_TO_MEM,         /* pointer to valid memory (stack, packet, map value) */
        ARG_PTR_TO_MEM_OR_NULL, /* pointer to valid memory or NULL */
        ARG_PTR_TO_UNINIT_MEM,  /* pointer to memory does not need to be initialized,
                                 * helper function must fill all bytes or clear
                                 * them in error case.
                                 */

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

        ARG_PTR_TO_CTX,         /* pointer to context */
        ARG_PTR_TO_CTX_OR_NULL, /* pointer to context or NULL */
        ARG_ANYTHING,           /* any (initialized) argument is ok */
        ARG_PTR_TO_SPIN_LOCK,   /* pointer to bpf_spin_lock */
        ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
        ARG_PTR_TO_INT,         /* pointer to int */
        ARG_PTR_TO_LONG,        /* pointer to long */
        ARG_PTR_TO_SOCKET,      /* pointer to bpf_sock (fullsock) */
        ARG_PTR_TO_BTF_ID,      /* pointer to in-kernel struct */
        ARG_PTR_TO_ALLOC_MEM,   /* pointer to dynamically allocated memory */
        ARG_PTR_TO_ALLOC_MEM_OR_NULL,   /* pointer to dynamically allocated memory or NULL */
        ARG_CONST_ALLOC_SIZE_OR_ZERO,   /* number of allocated bytes requested */
};

/* type of values returned from helper functions */
enum bpf_return_type {
        RET_INTEGER,                    /* function returns integer */
        RET_VOID,                       /* function doesn't return anything */
        RET_PTR_TO_MAP_VALUE,           /* returns a pointer to map elem value */
        RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
        RET_PTR_TO_SOCKET_OR_NULL,      /* returns a pointer to a socket or NULL */
        RET_PTR_TO_TCP_SOCK_OR_NULL,    /* returns a pointer to a tcp_sock or NULL */
        RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */
        RET_PTR_TO_ALLOC_MEM_OR_NULL,   /* returns a pointer to dynamically allocated memory or NULL */
};

/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
 * instructions after verifying
 */
struct bpf_func_proto {
        u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
        bool gpl_only;
        bool pkt_access;
        enum bpf_return_type ret_type;
        union {
                struct {
                        enum bpf_arg_type arg1_type;
                        enum bpf_arg_type arg2_type;
                        enum bpf_arg_type arg3_type;
                        enum bpf_arg_type arg4_type;
                        enum bpf_arg_type arg5_type;
                };
                enum bpf_arg_type arg_type[5];
        };
        int *btf_id; /* BTF ids of arguments */
};

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

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

/* types of values stored in eBPF registers */
/* Pointer types represent:
 * pointer
 * pointer + imm
 * pointer + (u16) var
 * pointer + (u16) var + imm
 * if (range > 0) then [ptr, ptr + range - off) is safe to access
 * if (id > 0) means that some 'var' was added
 * if (off > 0) means that 'imm' was added
 */
enum bpf_reg_type {
        NOT_INIT = 0,            /* nothing was written into register */
        SCALAR_VALUE,            /* reg doesn't contain a valid pointer */
        PTR_TO_CTX,              /* reg points to bpf_context */
        CONST_PTR_TO_MAP,        /* reg points to struct bpf_map */
        PTR_TO_MAP_VALUE,        /* reg points to map element value */
        PTR_TO_MAP_VALUE_OR_NULL,/* points to map elem value or NULL */
        PTR_TO_STACK,            /* reg == frame_pointer + offset */
        PTR_TO_PACKET_META,      /* skb->data - meta_len */
        PTR_TO_PACKET,           /* reg points to skb->data */
        PTR_TO_PACKET_END,       /* skb->data + headlen */
        PTR_TO_FLOW_KEYS,        /* reg points to bpf_flow_keys */
        PTR_TO_SOCKET,           /* reg points to struct bpf_sock */
        PTR_TO_SOCKET_OR_NULL,   /* reg points to struct bpf_sock or NULL */
        PTR_TO_SOCK_COMMON,      /* reg points to sock_common */
        PTR_TO_SOCK_COMMON_OR_NULL, /* reg points to sock_common or NULL */
        PTR_TO_TCP_SOCK,         /* reg points to struct tcp_sock */
        PTR_TO_TCP_SOCK_OR_NULL, /* reg points to struct tcp_sock or NULL */
        PTR_TO_TP_BUFFER,        /* reg points to a writable raw tp's buffer */
        PTR_TO_XDP_SOCK,         /* reg points to struct xdp_sock */
        PTR_TO_BTF_ID,           /* reg points to kernel struct */
        PTR_TO_BTF_ID_OR_NULL,   /* reg points to kernel struct or NULL */
        PTR_TO_MEM,              /* reg points to valid memory region */
        PTR_TO_MEM_OR_NULL,      /* reg points to valid memory region or NULL */
};

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

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

struct bpf_prog_ops {
        int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
                        union bpf_attr __user *uattr);
};

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

        /* return true if 'size' wide access at offset 'off' within bpf_context
         * with 'type' (read or write) is allowed
         */
        bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
                                const struct bpf_prog *prog,
                                struct bpf_insn_access_aux *info);
        int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
                            const struct bpf_prog *prog);
        int (*gen_ld_abs)(const struct bpf_insn *orig,
                          struct bpf_insn *insn_buf);
        u32 (*convert_ctx_access)(enum bpf_access_type type,
                                  const struct bpf_insn *src,
                                  struct bpf_insn *dst,
                                  struct bpf_prog *prog, u32 *target_size);
        int (*btf_struct_access)(struct bpf_verifier_log *log,
                                 const struct btf_type *t, int off, int size,
                                 enum bpf_access_type atype,
                                 u32 *next_btf_id);
};

struct bpf_prog_offload_ops {
        /* verifier basic callbacks */
        int (*insn_hook)(struct bpf_verifier_env *env,
                         int insn_idx, int prev_insn_idx);
        int (*finalize)(struct bpf_verifier_env *env);
        /* verifier optimization callbacks (called after .finalize) */
        int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
                            struct bpf_insn *insn);
        int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
        /* program management callbacks */
        int (*prepare)(struct bpf_prog *prog);
        int (*translate)(struct bpf_prog *prog);
        void (*destroy)(struct bpf_prog *prog);
};

struct bpf_prog_offload {
        struct bpf_prog         *prog;
        struct net_device       *netdev;
        struct bpf_offload_dev  *offdev;
        void                    *dev_priv;
        struct list_head        offloads;
        bool                    dev_state;
        bool                    opt_failed;
        void                    *jited_image;
        u32                     jited_len;
};

enum bpf_cgroup_storage_type {
        BPF_CGROUP_STORAGE_SHARED,
        BPF_CGROUP_STORAGE_PERCPU,
        __BPF_CGROUP_STORAGE_MAX
};

#define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX

/* The longest tracepoint has 12 args.
 * See include/trace/bpf_probe.h
 */
#define MAX_BPF_FUNC_ARGS 12

struct bpf_prog_stats {
        u64 cnt;
        u64 nsecs;
        struct u64_stats_sync syncp;
} __aligned(2 * sizeof(u64));

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

/* Restore arguments before returning from trampoline to let original function
 * continue executing. This flag is used for fentry progs when there are no
 * fexit progs.
 */
#define BPF_TRAMP_F_RESTORE_REGS        BIT(0)
/* Call original function after fentry progs, but before fexit progs.
 * Makes sense for fentry/fexit, normal calls and indirect calls.
 */
#define BPF_TRAMP_F_CALL_ORIG           BIT(1)
/* Skip current frame and return to parent.  Makes sense for fentry/fexit
 * programs only. Should not be used with normal calls and indirect calls.
 */
#define BPF_TRAMP_F_SKIP_FRAME          BIT(2)

/* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
 * bytes on x86.  Pick a number to fit into BPF_IMAGE_SIZE / 2
 */
#define BPF_MAX_TRAMP_PROGS 40

struct bpf_tramp_progs {
        struct bpf_prog *progs[BPF_MAX_TRAMP_PROGS];
        int nr_progs;
};

/* Different use cases for BPF trampoline:
 * 1. replace nop at the function entry (kprobe equivalent)
 *    flags = BPF_TRAMP_F_RESTORE_REGS
 *    fentry = a set of programs to run before returning from trampoline
 *
 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
 *    flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
 *    orig_call = fentry_ip + MCOUNT_INSN_SIZE
 *    fentry = a set of program to run before calling original function
 *    fexit = a set of program to run after original function
 *
 * 3. replace direct call instruction anywhere in the function body
 *    or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
 *    With flags = 0
 *      fentry = a set of programs to run before returning from trampoline
 *    With flags = BPF_TRAMP_F_CALL_ORIG
 *      orig_call = original callback addr or direct function addr
 *      fentry = a set of program to run before calling original function
 *      fexit = a set of program to run after original function
 */
int arch_prepare_bpf_trampoline(void *image, void *image_end,
                                const struct btf_func_model *m, u32 flags,
                                struct bpf_tramp_progs *tprogs,
                                void *orig_call);
/* these two functions are called from generated trampoline */
u64 notrace __bpf_prog_enter(void);
void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start);

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

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

struct bpf_trampoline {
        /* hlist for trampoline_table */
        struct hlist_node hlist;
        /* serializes access to fields of this trampoline */
        struct mutex mutex;
        refcount_t refcnt;
        u64 key;
        struct {
                struct btf_func_model model;
                void *addr;
                bool ftrace_managed;
        } func;
        /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
         * program by replacing one of its functions. func.addr is the address
         * of the function it replaced.
         */
        struct bpf_prog *extension_prog;
        /* list of BPF programs using this trampoline */
        struct hlist_head progs_hlist[BPF_TRAMP_MAX];
        /* Number of attached programs. A counter per kind. */
        int progs_cnt[BPF_TRAMP_MAX];
        /* Executable image of trampoline */
        void *image;
        u64 selector;
        struct bpf_ksym ksym;
};

#define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */

struct bpf_dispatcher_prog {
        struct bpf_prog *prog;
        refcount_t users;
};

struct bpf_dispatcher {
        /* dispatcher mutex */
        struct mutex mutex;
        void *func;
        struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
        int num_progs;
        void *image;
        u32 image_off;
        struct bpf_ksym ksym;
};

static __always_inline unsigned int bpf_dispatcher_nop_func(
        const void *ctx,
        const struct bpf_insn *insnsi,
        unsigned int (*bpf_func)(const void *,
                                 const struct bpf_insn *))
{
        return bpf_func(ctx, insnsi);
}
#ifdef CONFIG_BPF_JIT
struct bpf_trampoline *bpf_trampoline_lookup(u64 key);
int bpf_trampoline_link_prog(struct bpf_prog *prog);
int bpf_trampoline_unlink_prog(struct bpf_prog *prog);
void bpf_trampoline_put(struct bpf_trampoline *tr);
#define BPF_DISPATCHER_INIT(_name) {                            \
        .mutex = __MUTEX_INITIALIZER(_name.mutex),              \
        .func = &_name##_func,                                  \
        .progs = {},                                            \
        .num_progs = 0,                                         \
        .image = NULL,                                          \
        .image_off = 0,                                         \
        .ksym = {                                               \
                .name  = #_name,                                \
                .lnode = LIST_HEAD_INIT(_name.ksym.lnode),      \
        },                                                      \
}

#define DEFINE_BPF_DISPATCHER(name)                                     \
        noinline unsigned int bpf_dispatcher_##name##_func(             \
                const void *ctx,                                        \
                const struct bpf_insn *insnsi,                          \
                unsigned int (*bpf_func)(const void *,                  \
                                         const struct bpf_insn *))      \
        {                                                               \
                return bpf_func(ctx, insnsi);                           \
        }                                                               \
        EXPORT_SYMBOL(bpf_dispatcher_##name##_func);                    \
        struct bpf_dispatcher bpf_dispatcher_##name =                   \
                BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
#define DECLARE_BPF_DISPATCHER(name)                                    \
        unsigned int bpf_dispatcher_##name##_func(                      \
                const void *ctx,                                        \
                const struct bpf_insn *insnsi,                          \
                unsigned int (*bpf_func)(const void *,                  \
                                         const struct bpf_insn *));     \
        extern struct bpf_dispatcher bpf_dispatcher_##name;
#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
#define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
                                struct bpf_prog *to);
/* Called only from JIT-enabled code, so there's no need for stubs. */
void *bpf_jit_alloc_exec_page(void);
void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
void bpf_image_ksym_del(struct bpf_ksym *ksym);
void bpf_ksym_add(struct bpf_ksym *ksym);
void bpf_ksym_del(struct bpf_ksym *ksym);
#else
static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
{
        return NULL;
}
static inline int bpf_trampoline_link_prog(struct bpf_prog *prog)
{
        return -ENOTSUPP;
}
static inline int bpf_trampoline_unlink_prog(struct bpf_prog *prog)
{
        return -ENOTSUPP;
}
static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
#define DEFINE_BPF_DISPATCHER(name)
#define DECLARE_BPF_DISPATCHER(name)
#define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
#define BPF_DISPATCHER_PTR(name) NULL
static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
                                              struct bpf_prog *from,
                                              struct bpf_prog *to) {}
static inline bool is_bpf_image_address(unsigned long address)
{
        return false;
}
#endif

struct bpf_func_info_aux {
        u16 linkage;
        bool unreliable;
};

enum bpf_jit_poke_reason {
        BPF_POKE_REASON_TAIL_CALL,
};

/* Descriptor of pokes pointing /into/ the JITed image. */
struct bpf_jit_poke_descriptor {
        void *ip;
        union {
                struct {
                        struct bpf_map *map;
                        u32 key;
                } tail_call;
        };
        bool ip_stable;
        u8 adj_off;
        u16 reason;
};

/* reg_type info for ctx arguments */
struct bpf_ctx_arg_aux {
        u32 offset;
        enum bpf_reg_type reg_type;
};

struct bpf_prog_aux {
        atomic64_t refcnt;
        u32 used_map_cnt;
        u32 max_ctx_offset;
        u32 max_pkt_offset;
        u32 max_tp_access;
        u32 stack_depth;
        u32 id;
        u32 func_cnt; /* used by non-func prog as the number of func progs */
        u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
        u32 attach_btf_id; /* in-kernel BTF type id to attach to */
        u32 ctx_arg_info_size;
        const struct bpf_ctx_arg_aux *ctx_arg_info;
        struct bpf_prog *linked_prog;
        bool verifier_zext; /* Zero extensions has been inserted by verifier. */
        bool offload_requested;
        bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
        bool func_proto_unreliable;
        enum bpf_tramp_prog_type trampoline_prog_type;
        struct bpf_trampoline *trampoline;
        struct hlist_node tramp_hlist;
        /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
        const struct btf_type *attach_func_proto;
        /* function name for valid attach_btf_id */
        const char *attach_func_name;
        struct bpf_prog **func;
        void *jit_data; /* JIT specific data. arch dependent */
        struct bpf_jit_poke_descriptor *poke_tab;
        u32 size_poke_tab;
        struct bpf_ksym ksym;
        const struct bpf_prog_ops *ops;
        struct bpf_map **used_maps;
        struct bpf_prog *prog;
        struct user_struct *user;
        u64 load_time; /* ns since boottime */
        struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
        char name[BPF_OBJ_NAME_LEN];
#ifdef CONFIG_SECURITY
        void *security;
#endif
        struct bpf_prog_offload *offload;
        struct btf *btf;
        struct bpf_func_info *func_info;
        struct bpf_func_info_aux *func_info_aux;
        /* bpf_line_info loaded from userspace.  linfo->insn_off
         * has the xlated insn offset.
         * Both the main and sub prog share the same linfo.
         * The subprog can access its first linfo by
         * using the linfo_idx.
         */
        struct bpf_line_info *linfo;
        /* jited_linfo is the jited addr of the linfo.  It has a
         * one to one mapping to linfo:
         * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
         * Both the main and sub prog share the same jited_linfo.
         * The subprog can access its first jited_linfo by
         * using the linfo_idx.
         */
        void **jited_linfo;
        u32 func_info_cnt;
        u32 nr_linfo;
        /* subprog can use linfo_idx to access its first linfo and
         * jited_linfo.
         * main prog always has linfo_idx == 0
         */
        u32 linfo_idx;
        u32 num_exentries;
        struct exception_table_entry *extable;
        struct bpf_prog_stats __percpu *stats;
        union {
                struct work_struct work;
                struct rcu_head rcu;
        };
};

struct bpf_array_aux {
        /* 'Ownership' of prog array is claimed by the first program that
         * is going to use this map or by the first program which FD is
         * stored in the map to make sure that all callers and callees have
         * the same prog type and JITed flag.
         */
        enum bpf_prog_type type;
        bool jited;
        /* Programs with direct jumps into programs part of this array. */
        struct list_head poke_progs;
        struct bpf_map *map;
        struct mutex poke_mutex;
        struct work_struct work;
};

struct bpf_struct_ops_value;
struct btf_type;
struct btf_member;

#define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
struct bpf_struct_ops {
        const struct bpf_verifier_ops *verifier_ops;
        int (*init)(struct btf *btf);
        int (*check_member)(const struct btf_type *t,
                            const struct btf_member *member);
        int (*init_member)(const struct btf_type *t,
                           const struct btf_member *member,
                           void *kdata, const void *udata);
        int (*reg)(void *kdata);
        void (*unreg)(void *kdata);
        const struct btf_type *type;
        const struct btf_type *value_type;
        const char *name;
        struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
        u32 type_id;
        u32 value_id;
};

#if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
#define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
bool bpf_struct_ops_get(const void *kdata);
void bpf_struct_ops_put(const void *kdata);
int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
                                       void *value);
static inline bool bpf_try_module_get(const void *data, struct module *owner)
{
        if (owner == BPF_MODULE_OWNER)
                return bpf_struct_ops_get(data);
        else
                return try_module_get(owner);
}
static inline void bpf_module_put(const void *data, struct module *owner)
{
        if (owner == BPF_MODULE_OWNER)
                bpf_struct_ops_put(data);
        else
                module_put(owner);
}
#else
static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
{
        return NULL;
}
static inline void bpf_struct_ops_init(struct btf *btf,
                                       struct bpf_verifier_log *log)
{
}
static inline bool bpf_try_module_get(const void *data, struct module *owner)
{
        return try_module_get(owner);
}
static inline void bpf_module_put(const void *data, struct module *owner)
{
        module_put(owner);
}
static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
                                                     void *key,
                                                     void *value)
{
        return -EINVAL;
}
#endif

struct bpf_array {
        struct bpf_map map;
        u32 elem_size;
        u32 index_mask;
        struct bpf_array_aux *aux;
        union {
                char value[0] __aligned(8);
                void *ptrs[0] __aligned(8);
                void __percpu *pptrs[0] __aligned(8);
        };
};

#define BPF_COMPLEXITY_LIMIT_INSNS      1000000 /* yes. 1M insns */
#define MAX_TAIL_CALL_CNT 32

#define BPF_F_ACCESS_MASK       (BPF_F_RDONLY |         \
                                 BPF_F_RDONLY_PROG |    \
                                 BPF_F_WRONLY |         \
                                 BPF_F_WRONLY_PROG)

#define BPF_MAP_CAN_READ        BIT(0)
#define BPF_MAP_CAN_WRITE       BIT(1)

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

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

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

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

bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp);
int bpf_prog_calc_tag(struct bpf_prog *fp);
const char *kernel_type_name(u32 btf_type_id);

const struct bpf_func_proto *bpf_get_trace_printk_proto(void);

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

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

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

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

struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
void bpf_prog_array_free(struct bpf_prog_array *progs);
int bpf_prog_array_length(struct bpf_prog_array *progs);
bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
                                __u32 __user *prog_ids, u32 cnt);

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

#define __BPF_PROG_RUN_ARRAY(array, ctx, func, check_non_null)  \
        ({                                              \
                struct bpf_prog_array_item *_item;      \
                struct bpf_prog *_prog;                 \
                struct bpf_prog_array *_array;          \
                u32 _ret = 1;                           \
                migrate_disable();                      \
                rcu_read_lock();                        \
                _array = rcu_dereference(array);        \
                if (unlikely(check_non_null && !_array))\
                        goto _out;                      \
                _item = &_array->items[0];              \
                while ((_prog = READ_ONCE(_item->prog))) {              \
                        bpf_cgroup_storage_set(_item->cgroup_storage);  \
                        _ret &= func(_prog, ctx);       \
                        _item++;                        \
                }                                       \
_out:                                                   \
                rcu_read_unlock();                      \
                migrate_enable();                       \
                _ret;                                   \
         })

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

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

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

#ifdef CONFIG_BPF_SYSCALL
DECLARE_PER_CPU(int, bpf_prog_active);
extern struct mutex bpf_stats_enabled_mutex;

/*
 * Block execution of BPF programs attached to instrumentation (perf,
 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
 * these events can happen inside a region which holds a map bucket lock
 * and can deadlock on it.
 *
 * Use the preemption safe inc/dec variants on RT because migrate disable
 * is preemptible on RT and preemption in the middle of the RMW operation
 * might lead to inconsistent state. Use the raw variants for non RT
 * kernels as migrate_disable() maps to preempt_disable() so the slightly
 * more expensive save operation can be avoided.
 */
static inline void bpf_disable_instrumentation(void)
{
        migrate_disable();
        if (IS_ENABLED(CONFIG_PREEMPT_RT))
                this_cpu_inc(bpf_prog_active);
        else
                __this_cpu_inc(bpf_prog_active);
}

static inline void bpf_enable_instrumentation(void)
{
        if (IS_ENABLED(CONFIG_PREEMPT_RT))
                this_cpu_dec(bpf_prog_active);
        else
                __this_cpu_dec(bpf_prog_active);
        migrate_enable();
}

extern const struct file_operations bpf_map_fops;
extern const struct file_operations bpf_prog_fops;
extern const struct file_operations bpf_iter_fops;

#define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
        extern const struct bpf_prog_ops _name ## _prog_ops; \
        extern const struct bpf_verifier_ops _name ## _verifier_ops;
#define BPF_MAP_TYPE(_id, _ops) \
        extern const struct bpf_map_ops _ops;
#define BPF_LINK_TYPE(_id, _name)
#include <linux/bpf_types.h>
#undef BPF_PROG_TYPE
#undef BPF_MAP_TYPE
#undef BPF_LINK_TYPE

extern const struct bpf_prog_ops bpf_offload_prog_ops;
extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
extern const struct bpf_verifier_ops xdp_analyzer_ops;

struct bpf_prog *bpf_prog_get(u32 ufd);
struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
                                       bool attach_drv);
void bpf_prog_add(struct bpf_prog *prog, int i);
void bpf_prog_sub(struct bpf_prog *prog, int i);
void bpf_prog_inc(struct bpf_prog *prog);
struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
void bpf_prog_put(struct bpf_prog *prog);
int __bpf_prog_charge(struct user_struct *user, u32 pages);
void __bpf_prog_uncharge(struct user_struct *user, u32 pages);
void __bpf_free_used_maps(struct bpf_prog_aux *aux,
                          struct bpf_map **used_maps, u32 len);

void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);

struct bpf_map *bpf_map_get(u32 ufd);
struct bpf_map *bpf_map_get_with_uref(u32 ufd);
struct bpf_map *__bpf_map_get(struct fd f);
void bpf_map_inc(struct bpf_map *map);
void bpf_map_inc_with_uref(struct bpf_map *map);
struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
void bpf_map_put_with_uref(struct bpf_map *map);
void bpf_map_put(struct bpf_map *map);
int bpf_map_charge_memlock(struct bpf_map *map, u32 pages);
void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages);
int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size);
void bpf_map_charge_finish(struct bpf_map_memory *mem);
void bpf_map_charge_move(struct bpf_map_memory *dst,
                         struct bpf_map_memory *src);
void *bpf_map_area_alloc(u64 size, int numa_node);
void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
void bpf_map_area_free(void *base);
void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
int  generic_map_lookup_batch(struct bpf_map *map,
                              const union bpf_attr *attr,
                              union bpf_attr __user *uattr);
int  generic_map_update_batch(struct bpf_map *map,
                              const union bpf_attr *attr,
                              union bpf_attr __user *uattr);
int  generic_map_delete_batch(struct bpf_map *map,
                              const union bpf_attr *attr,
                              union bpf_attr __user *uattr);
struct bpf_map *bpf_map_get_curr_or_next(u32 *id);

extern int sysctl_unprivileged_bpf_disabled;

static inline bool bpf_allow_ptr_leaks(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);

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

struct bpf_link_ops {
        void (*release)(struct bpf_link *link);
        void (*dealloc)(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);
};

void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
                   const struct bpf_link_ops *ops, struct bpf_prog *prog);
int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
int bpf_link_settle(struct bpf_link_primer *primer);
void bpf_link_cleanup(struct bpf_link_primer *primer);
void bpf_link_inc(struct bpf_link *link);
void bpf_link_put(struct bpf_link *link);
int bpf_link_new_fd(struct bpf_link *link);
struct file *bpf_link_new_file(struct bpf_link *link, int *reserved_fd);
struct bpf_link *bpf_link_get_from_fd(u32 ufd);

int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
int bpf_obj_get_user(const char __user *pathname, int flags);

#define BPF_ITER_FUNC_PREFIX "bpf_iter_"
#define DEFINE_BPF_ITER_FUNC(target, args...)                   \
        extern int bpf_iter_ ## target(args);                   \
        int __init bpf_iter_ ## target(args) { return 0; }

typedef int (*bpf_iter_init_seq_priv_t)(void *private_data);
typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);

#define BPF_ITER_CTX_ARG_MAX 2
struct bpf_iter_reg {
        const char *target;
        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;
        u32 ctx_arg_info_size;
        struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
};

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

int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
bool bpf_iter_prog_supported(struct bpf_prog *prog);
int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
int bpf_iter_new_fd(struct bpf_link *link);
bool bpf_link_is_iter(struct bpf_link *link);
struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);

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

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

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

int bpf_get_file_flag(int flags);
int bpf_check_uarg_tail_zero(void __user *uaddr, size_t expected_size,
                             size_t actual_size);

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

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

/* verify correctness of eBPF program */
int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
              union bpf_attr __user *uattr);
void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);

/* Map specifics */
struct xdp_buff;
struct sk_buff;

struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
struct bpf_dtab_netdev *__dev_map_hash_lookup_elem(struct bpf_map *map, u32 key);
void __dev_flush(void);
int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
                    struct net_device *dev_rx);
int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
                    struct net_device *dev_rx);
int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
                             struct bpf_prog *xdp_prog);
bool dev_map_can_have_prog(struct bpf_map *map);

struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);
void __cpu_map_flush(void);
int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
                    struct net_device *dev_rx);

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

int btf_distill_func_proto(struct bpf_verifier_log *log,
                           struct btf *btf,
                           const struct btf_type *func_proto,
                           const char *func_name,
                           struct btf_func_model *m);

struct bpf_reg_state;
int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
                             struct bpf_reg_state *regs);
int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
                          struct bpf_reg_state *reg);
int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
                         struct btf *btf, const struct btf_type *t);

struct bpf_prog *bpf_prog_by_id(u32 id);

const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
#else /* !CONFIG_BPF_SYSCALL */
static inline struct bpf_prog *bpf_prog_get(u32 ufd)
{
        return ERR_PTR(-EOPNOTSUPP);
}

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

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

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

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

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

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

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

static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
{
}

static inline int bpf_obj_get_user(const char __user *pathname, int flags)
{
        return -EOPNOTSUPP;
}

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

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

static inline void __dev_flush(void)
{
}

struct xdp_buff;
struct bpf_dtab_netdev;

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

static inline
int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
                    struct net_device *dev_rx)
{
        return 0;
}

struct sk_buff;

static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
                                           struct sk_buff *skb,
                                           struct bpf_prog *xdp_prog)
{
        return 0;
}

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

static inline void __cpu_map_flush(void)
{
}

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

static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
                                enum bpf_prog_type type)
{
        return ERR_PTR(-EOPNOTSUPP);
}

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

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

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

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

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

static inline struct bpf_prog *bpf_prog_by_id(u32 id)
{
        return ERR_PTR(-ENOTSUPP);
}

static inline const struct bpf_func_proto *
bpf_base_func_proto(enum bpf_func_id func_id)
{
        return NULL;
}
#endif /* CONFIG_BPF_SYSCALL */

static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
                                                 enum bpf_prog_type type)
{
        return bpf_prog_get_type_dev(ufd, type, false);
}

bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);

int bpf_prog_offload_compile(struct bpf_prog *prog);
void bpf_prog_offload_destroy(struct bpf_prog *prog);
int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
                               struct bpf_prog *prog);

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

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

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

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

#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);

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

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

struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
void bpf_map_offload_map_free(struct bpf_map *map);
#else
static inline int bpf_prog_offload_init(struct bpf_prog *prog,
                                        union bpf_attr *attr)
{
        return -EOPNOTSUPP;
}

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

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

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

static inline void bpf_map_offload_map_free(struct bpf_map *map)
{
}
#endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */

#if defined(CONFIG_BPF_STREAM_PARSER)
int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, u32 which);
int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
void sock_map_unhash(struct sock *sk);
void sock_map_close(struct sock *sk, long timeout);
#else
static inline int sock_map_prog_update(struct bpf_map *map,
                                       struct bpf_prog *prog, u32 which)
{
        return -EOPNOTSUPP;
}

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

#if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
void bpf_sk_reuseport_detach(struct sock *sk);
int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
                                       void *value);
int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
                                       void *value, u64 map_flags);
#else
static inline void bpf_sk_reuseport_detach(struct sock *sk)
{
}

#ifdef CONFIG_BPF_SYSCALL
static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
                                                     void *key, void *value)
{
        return -EOPNOTSUPP;
}

static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
                                                     void *key, void *value,
                                                     u64 map_flags)
{
        return -EOPNOTSUPP;
}
#endif /* CONFIG_BPF_SYSCALL */
#endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */

/* verifier prototypes for helper functions called from eBPF programs */
extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
extern const struct bpf_func_proto bpf_map_update_elem_proto;
extern const struct bpf_func_proto bpf_map_delete_elem_proto;
extern const struct bpf_func_proto bpf_map_push_elem_proto;
extern const struct bpf_func_proto bpf_map_pop_elem_proto;
extern const struct bpf_func_proto bpf_map_peek_elem_proto;

extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
extern const struct bpf_func_proto bpf_tail_call_proto;
extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
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_sock_map_update_proto;
extern const struct bpf_func_proto bpf_sock_hash_update_proto;
extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
extern const struct bpf_func_proto bpf_spin_lock_proto;
extern const struct bpf_func_proto bpf_spin_unlock_proto;
extern const struct bpf_func_proto bpf_get_local_storage_proto;
extern const struct bpf_func_proto bpf_strtol_proto;
extern const struct bpf_func_proto bpf_strtoul_proto;
extern const struct bpf_func_proto bpf_tcp_sock_proto;
extern const struct bpf_func_proto bpf_jiffies64_proto;
extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
extern const struct bpf_func_proto bpf_event_output_data_proto;
extern const struct bpf_func_proto bpf_ringbuf_output_proto;
extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
extern const struct bpf_func_proto bpf_ringbuf_query_proto;

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

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

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

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

#ifdef CONFIG_INET
struct sk_reuseport_kern {
        struct sk_buff *skb;
        struct sock *sk;
        struct sock *selected_sk;
        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);

#endif /* _LINUX_BPF_H */