mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 17:23:55 +08:00
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
|
/* 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_VERIFIER_H
|
||
|
|
#define _LINUX_BPF_VERIFIER_H 1
|
||
|
|
|
||
|
|
#include <linux/bpf.h> /* for enum bpf_reg_type */
|
||
|
|
#include <linux/filter.h> /* for MAX_BPF_STACK */
|
||
|
|
|
||
|
|
struct bpf_reg_state {
|
||
|
|
enum bpf_reg_type type;
|
||
|
|
union {
|
||
|
|
/* valid when type == CONST_IMM | PTR_TO_STACK | UNKNOWN_VALUE */
|
||
|
|
s64 imm;
|
||
|
|
|
||
|
|
/* valid when type == PTR_TO_PACKET* */
|
||
|
|
struct {
|
||
|
|
u32 id;
|
||
|
|
u16 off;
|
||
|
|
u16 range;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* valid when type == CONST_PTR_TO_MAP | PTR_TO_MAP_VALUE |
|
||
|
|
* PTR_TO_MAP_VALUE_OR_NULL
|
||
|
|
*/
|
||
|
|
struct bpf_map *map_ptr;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
enum bpf_stack_slot_type {
|
||
|
|
STACK_INVALID, /* nothing was stored in this stack slot */
|
||
|
|
STACK_SPILL, /* register spilled into stack */
|
||
|
|
STACK_MISC /* BPF program wrote some data into this slot */
|
||
|
|
};
|
||
|
|
|
||
|
|
#define BPF_REG_SIZE 8 /* size of eBPF register in bytes */
|
||
|
|
|
||
|
|
/* state of the program:
|
||
|
|
* type of all registers and stack info
|
||
|
|
*/
|
||
|
|
struct bpf_verifier_state {
|
||
|
|
struct bpf_reg_state regs[MAX_BPF_REG];
|
||
|
|
u8 stack_slot_type[MAX_BPF_STACK];
|
||
|
|
struct bpf_reg_state spilled_regs[MAX_BPF_STACK / BPF_REG_SIZE];
|
||
|
|
};
|
||
|
|
|
||
|
|
/* linked list of verifier states used to prune search */
|
||
|
|
struct bpf_verifier_state_list {
|
||
|
|
struct bpf_verifier_state state;
|
||
|
|
struct bpf_verifier_state_list *next;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct bpf_insn_aux_data {
|
||
|
|
enum bpf_reg_type ptr_type; /* pointer type for load/store insns */
|
||
|
|
};
|
||
|
|
|
||
|
|
#define MAX_USED_MAPS 64 /* max number of maps accessed by one eBPF program */
|
||
|
|
|
||
|
|
/* single container for all structs
|
||
|
|
* one verifier_env per bpf_check() call
|
||
|
|
*/
|
||
|
|
struct bpf_verifier_env {
|
||
|
|
struct bpf_prog *prog; /* eBPF program being verified */
|
||
|
|
struct bpf_verifier_stack_elem *head; /* stack of verifier states to be processed */
|
||
|
|
int stack_size; /* number of states to be processed */
|
||
|
|
struct bpf_verifier_state cur_state; /* current verifier state */
|
||
|
|
struct bpf_verifier_state_list **explored_states; /* search pruning optimization */
|
||
|
|
struct bpf_map *used_maps[MAX_USED_MAPS]; /* array of map's used by eBPF program */
|
||
|
|
u32 used_map_cnt; /* number of used maps */
|
||
|
|
u32 id_gen; /* used to generate unique reg IDs */
|
||
|
|
bool allow_ptr_leaks;
|
||
|
|
bool seen_direct_write;
|
||
|
|
struct bpf_insn_aux_data *insn_aux_data; /* array of per-insn state */
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* _LINUX_BPF_VERIFIER_H */
|