146 lines
4.3 KiB
C
146 lines
4.3 KiB
C
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#ifndef _LINUX_BPF_H
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#define _LINUX_BPF_H 1
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#include <uapi/linux/bpf.h>
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#include <linux/workqueue.h>
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#include <linux/file.h>
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struct bpf_map;
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/* map is generic key/value storage optionally accesible by eBPF programs */
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struct bpf_map_ops {
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/* funcs callable from userspace (via syscall) */
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struct bpf_map *(*map_alloc)(union bpf_attr *attr);
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void (*map_free)(struct bpf_map *);
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int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
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/* funcs callable from userspace and from eBPF programs */
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void *(*map_lookup_elem)(struct bpf_map *map, void *key);
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int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
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int (*map_delete_elem)(struct bpf_map *map, void *key);
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};
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struct bpf_map {
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atomic_t refcnt;
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enum bpf_map_type map_type;
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u32 key_size;
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u32 value_size;
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u32 max_entries;
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struct bpf_map_ops *ops;
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struct work_struct work;
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};
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struct bpf_map_type_list {
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struct list_head list_node;
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struct bpf_map_ops *ops;
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enum bpf_map_type type;
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};
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void bpf_register_map_type(struct bpf_map_type_list *tl);
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void bpf_map_put(struct bpf_map *map);
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struct bpf_map *bpf_map_get(struct fd f);
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/* function argument constraints */
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enum bpf_arg_type {
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ARG_ANYTHING = 0, /* any argument is ok */
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/* the following constraints used to prototype
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* bpf_map_lookup/update/delete_elem() functions
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*/
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ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
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ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
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ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
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/* the following constraints used to prototype bpf_memcmp() and other
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* functions that access data on eBPF program stack
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*/
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ARG_PTR_TO_STACK, /* any pointer to eBPF program stack */
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ARG_CONST_STACK_SIZE, /* number of bytes accessed from stack */
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};
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/* type of values returned from helper functions */
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enum bpf_return_type {
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RET_INTEGER, /* function returns integer */
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RET_VOID, /* function doesn't return anything */
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RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
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};
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/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
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* to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
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* instructions after verifying
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*/
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struct bpf_func_proto {
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u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
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bool gpl_only;
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enum bpf_return_type ret_type;
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enum bpf_arg_type arg1_type;
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enum bpf_arg_type arg2_type;
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enum bpf_arg_type arg3_type;
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enum bpf_arg_type arg4_type;
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enum bpf_arg_type arg5_type;
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};
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/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
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* the first argument to eBPF programs.
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* For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
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*/
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struct bpf_context;
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enum bpf_access_type {
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BPF_READ = 1,
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BPF_WRITE = 2
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};
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struct bpf_verifier_ops {
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/* return eBPF function prototype for verification */
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const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id);
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/* return true if 'size' wide access at offset 'off' within bpf_context
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* with 'type' (read or write) is allowed
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*/
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bool (*is_valid_access)(int off, int size, enum bpf_access_type type);
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};
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struct bpf_prog_type_list {
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struct list_head list_node;
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struct bpf_verifier_ops *ops;
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enum bpf_prog_type type;
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};
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void bpf_register_prog_type(struct bpf_prog_type_list *tl);
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struct bpf_prog;
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struct bpf_prog_aux {
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atomic_t refcnt;
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bool is_gpl_compatible;
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enum bpf_prog_type prog_type;
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struct bpf_verifier_ops *ops;
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struct bpf_map **used_maps;
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u32 used_map_cnt;
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struct bpf_prog *prog;
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struct work_struct work;
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};
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#ifdef CONFIG_BPF_SYSCALL
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void bpf_prog_put(struct bpf_prog *prog);
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#else
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static inline void bpf_prog_put(struct bpf_prog *prog) {}
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#endif
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struct bpf_prog *bpf_prog_get(u32 ufd);
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/* verify correctness of eBPF program */
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int bpf_check(struct bpf_prog *fp, union bpf_attr *attr);
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/* verifier prototypes for helper functions called from eBPF programs */
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extern struct bpf_func_proto bpf_map_lookup_elem_proto;
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extern struct bpf_func_proto bpf_map_update_elem_proto;
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extern struct bpf_func_proto bpf_map_delete_elem_proto;
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#endif /* _LINUX_BPF_H */
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