/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#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>

struct perf_event;
struct bpf_map;

/* map is generic key/value storage optionally accesible by eBPF programs */
struct bpf_map_ops {
        /* funcs callable from userspace (via syscall) */
        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);

        /* 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);

        /* 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);
};

struct bpf_map {
        atomic_t refcnt;
        enum bpf_map_type map_type;
        u32 key_size;
        u32 value_size;
        u32 max_entries;
        u32 map_flags;
        u32 pages;
        struct user_struct *user;
        const struct bpf_map_ops *ops;
        struct work_struct work;
        atomic_t usercnt;
};

struct bpf_map_type_list {
        struct list_head list_node;
        const struct bpf_map_ops *ops;
        enum bpf_map_type type;
};

/* 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 */

        /* the following constraints used to prototype bpf_memcmp() and other
         * functions that access data on eBPF program stack
         */
        ARG_PTR_TO_STACK,       /* any pointer to eBPF program stack */
        ARG_PTR_TO_RAW_STACK,   /* any pointer to eBPF program stack, area does not
                                 * need to be initialized, helper function must fill
                                 * all bytes or clear them in error case.
                                 */

        ARG_CONST_STACK_SIZE,   /* number of bytes accessed from stack */
        ARG_CONST_STACK_SIZE_OR_ZERO, /* number of bytes accessed from stack or 0 */

        ARG_PTR_TO_CTX,         /* pointer to context */
        ARG_ANYTHING,           /* any (initialized) argument is ok */
};

/* 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_OR_NULL,   /* returns a pointer to map elem value 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;
        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;
};

/* 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 */
enum bpf_reg_type {
        NOT_INIT = 0,            /* nothing was written into register */
        UNKNOWN_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 */
        FRAME_PTR,               /* reg == frame_pointer */
        PTR_TO_STACK,            /* reg == frame_pointer + imm */
        CONST_IMM,               /* constant integer value */

        /* PTR_TO_PACKET represents:
         * skb->data
         * skb->data + imm
         * skb->data + (u16) var
         * skb->data + (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) menas that 'imm' was added
         */
        PTR_TO_PACKET,
        PTR_TO_PACKET_END,       /* skb->data + headlen */

        /* PTR_TO_MAP_VALUE_ADJ is used for doing pointer math inside of a map
         * elem value.  We only allow this if we can statically verify that
         * access from this register are going to fall within the size of the
         * map element.
         */
        PTR_TO_MAP_VALUE_ADJ,
};

struct bpf_prog;

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

        /* 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,
                                enum bpf_reg_type *reg_type);
        int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
                            const struct bpf_prog *prog);
        u32 (*convert_ctx_access)(enum bpf_access_type type, int dst_reg,
                                  int src_reg, int ctx_off,
                                  struct bpf_insn *insn, struct bpf_prog *prog);
};

struct bpf_prog_type_list {
        struct list_head list_node;
        const struct bpf_verifier_ops *ops;
        enum bpf_prog_type type;
};

struct bpf_prog_aux {
        atomic_t refcnt;
        u32 used_map_cnt;
        u32 max_ctx_offset;
        const struct bpf_verifier_ops *ops;
        struct bpf_map **used_maps;
        struct bpf_prog *prog;
        struct user_struct *user;
        union {
                struct work_struct work;
                struct rcu_head rcu;
        };
};

struct bpf_array {
        struct bpf_map map;
        u32 elem_size;
        /* '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 owner_prog_type;
        bool owner_jited;
        union {
                char value[0] __aligned(8);
                void *ptrs[0] __aligned(8);
                void __percpu *pptrs[0] __aligned(8);
        };
};

#define MAX_TAIL_CALL_CNT 32

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

u64 bpf_tail_call(u64 ctx, u64 r2, u64 index, u64 r4, u64 r5);
u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);

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

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);

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);

#ifdef CONFIG_BPF_SYSCALL
DECLARE_PER_CPU(int, bpf_prog_active);

void bpf_register_prog_type(struct bpf_prog_type_list *tl);
void bpf_register_map_type(struct bpf_map_type_list *tl);

struct bpf_prog *bpf_prog_get(u32 ufd);
struct bpf_prog *bpf_prog_get_type(u32 ufd, enum bpf_prog_type type);
struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i);
struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog);
void bpf_prog_put(struct bpf_prog *prog);

struct bpf_map *bpf_map_get_with_uref(u32 ufd);
struct bpf_map *__bpf_map_get(struct fd f);
struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref);
void bpf_map_put_with_uref(struct bpf_map *map);
void bpf_map_put(struct bpf_map *map);
int bpf_map_precharge_memlock(u32 pages);

extern int sysctl_unprivileged_bpf_disabled;

int bpf_map_new_fd(struct bpf_map *map);
int bpf_prog_new_fd(struct bpf_prog *prog);

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

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);
void bpf_fd_array_map_clear(struct bpf_map *map);

/* 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);
#else
static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl)
{
}

static inline struct bpf_prog *bpf_prog_get(u32 ufd)
{
        return ERR_PTR(-EOPNOTSUPP);
}

static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
                                                 enum bpf_prog_type type)
{
        return ERR_PTR(-EOPNOTSUPP);
}
static inline struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i)
{
        return ERR_PTR(-EOPNOTSUPP);
}

static inline void bpf_prog_put(struct bpf_prog *prog)
{
}
static inline struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
{
        return ERR_PTR(-EOPNOTSUPP);
}
#endif /* 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_get_prandom_u32_proto;
extern const struct bpf_func_proto bpf_get_smp_processor_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_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_skb_vlan_push_proto;
extern const struct bpf_func_proto bpf_skb_vlan_pop_proto;
extern const struct bpf_func_proto bpf_get_stackid_proto;

/* 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);

#endif /* _LINUX_BPF_H */