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/* 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.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/bpf.h>
/* test stubs for BPF_MAP_TYPE_UNSPEC and for BPF_PROG_TYPE_UNSPEC
* to be used by user space verifier testsuite
*/
struct bpf_context {
u64 arg1;
u64 arg2;
};
static u64 test_func(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
{
return 0;
}
static struct bpf_func_proto test_funcs[] = {
[BPF_FUNC_unspec] = {
.func = test_func,
.gpl_only = true,
.ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_MAP_KEY,
},
};
static const struct bpf_func_proto *test_func_proto(enum bpf_func_id func_id)
{
if (func_id < 0 || func_id >= ARRAY_SIZE(test_funcs))
return NULL;
return &test_funcs[func_id];
}
static const struct bpf_context_access {
int size;
enum bpf_access_type type;
} test_ctx_access[] = {
[offsetof(struct bpf_context, arg1)] = {
FIELD_SIZEOF(struct bpf_context, arg1),
BPF_READ
},
[offsetof(struct bpf_context, arg2)] = {
FIELD_SIZEOF(struct bpf_context, arg2),
BPF_READ
},
};
static bool test_is_valid_access(int off, int size, enum bpf_access_type type)
{
const struct bpf_context_access *access;
if (off < 0 || off >= ARRAY_SIZE(test_ctx_access))
return false;
access = &test_ctx_access[off];
if (access->size == size && (access->type & type))
return true;
return false;
}
static struct bpf_verifier_ops test_ops = {
.get_func_proto = test_func_proto,
.is_valid_access = test_is_valid_access,
};
static struct bpf_prog_type_list tl_prog = {
.ops = &test_ops,
.type = BPF_PROG_TYPE_UNSPEC,
};
static struct bpf_map *test_map_alloc(union bpf_attr *attr)
{
struct bpf_map *map;
map = kzalloc(sizeof(*map), GFP_USER);
if (!map)
return ERR_PTR(-ENOMEM);
map->key_size = attr->key_size;
map->value_size = attr->value_size;
map->max_entries = attr->max_entries;
return map;
}
static void test_map_free(struct bpf_map *map)
{
kfree(map);
}
static struct bpf_map_ops test_map_ops = {
.map_alloc = test_map_alloc,
.map_free = test_map_free,
};
static struct bpf_map_type_list tl_map = {
.ops = &test_map_ops,
.type = BPF_MAP_TYPE_UNSPEC,
};
static int __init register_test_ops(void)
{
bpf_register_map_type(&tl_map);
bpf_register_prog_type(&tl_prog);
return 0;
}
late_initcall(register_test_ops);
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