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// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>
struct map_value {
struct prog_test_ref_kfunc __kptr *unref_ptr;
struct prog_test_ref_kfunc __kptr_ref *ref_ptr;
};
struct array_map {
__uint(type, BPF_MAP_TYPE_ARRAY);
__type(key, int);
__type(value, struct map_value);
__uint(max_entries, 1);
} array_map SEC(".maps");
struct hash_map {
__uint(type, BPF_MAP_TYPE_HASH);
__type(key, int);
__type(value, struct map_value);
__uint(max_entries, 1);
} hash_map SEC(".maps");
struct hash_malloc_map {
__uint(type, BPF_MAP_TYPE_HASH);
__type(key, int);
__type(value, struct map_value);
__uint(max_entries, 1);
__uint(map_flags, BPF_F_NO_PREALLOC);
} hash_malloc_map SEC(".maps");
struct lru_hash_map {
__uint(type, BPF_MAP_TYPE_LRU_HASH);
__type(key, int);
__type(value, struct map_value);
__uint(max_entries, 1);
} lru_hash_map SEC(".maps");
#define DEFINE_MAP_OF_MAP(map_type, inner_map_type, name) \
struct { \
__uint(type, map_type); \
__uint(max_entries, 1); \
__uint(key_size, sizeof(int)); \
__uint(value_size, sizeof(int)); \
__array(values, struct inner_map_type); \
} name SEC(".maps") = { \
.values = { [0] = &inner_map_type }, \
}
DEFINE_MAP_OF_MAP(BPF_MAP_TYPE_ARRAY_OF_MAPS, array_map, array_of_array_maps);
DEFINE_MAP_OF_MAP(BPF_MAP_TYPE_ARRAY_OF_MAPS, hash_map, array_of_hash_maps);
DEFINE_MAP_OF_MAP(BPF_MAP_TYPE_ARRAY_OF_MAPS, hash_malloc_map, array_of_hash_malloc_maps);
DEFINE_MAP_OF_MAP(BPF_MAP_TYPE_ARRAY_OF_MAPS, lru_hash_map, array_of_lru_hash_maps);
DEFINE_MAP_OF_MAP(BPF_MAP_TYPE_HASH_OF_MAPS, array_map, hash_of_array_maps);
DEFINE_MAP_OF_MAP(BPF_MAP_TYPE_HASH_OF_MAPS, hash_map, hash_of_hash_maps);
DEFINE_MAP_OF_MAP(BPF_MAP_TYPE_HASH_OF_MAPS, hash_malloc_map, hash_of_hash_malloc_maps);
DEFINE_MAP_OF_MAP(BPF_MAP_TYPE_HASH_OF_MAPS, lru_hash_map, hash_of_lru_hash_maps);
extern struct prog_test_ref_kfunc *bpf_kfunc_call_test_acquire(unsigned long *sp) __ksym;
extern struct prog_test_ref_kfunc *
bpf_kfunc_call_test_kptr_get(struct prog_test_ref_kfunc **p, int a, int b) __ksym;
extern void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) __ksym;
#define WRITE_ONCE(x, val) ((*(volatile typeof(x) *) &(x)) = (val))
static void test_kptr_unref(struct map_value *v)
{
struct prog_test_ref_kfunc *p;
p = v->unref_ptr;
/* store untrusted_ptr_or_null_ */
WRITE_ONCE(v->unref_ptr, p);
if (!p)
return;
if (p->a + p->b > 100)
return;
/* store untrusted_ptr_ */
WRITE_ONCE(v->unref_ptr, p);
/* store NULL */
WRITE_ONCE(v->unref_ptr, NULL);
}
static void test_kptr_ref(struct map_value *v)
{
struct prog_test_ref_kfunc *p;
p = v->ref_ptr;
/* store ptr_or_null_ */
WRITE_ONCE(v->unref_ptr, p);
if (!p)
return;
if (p->a + p->b > 100)
return;
/* store NULL */
p = bpf_kptr_xchg(&v->ref_ptr, NULL);
if (!p)
return;
if (p->a + p->b > 100) {
bpf_kfunc_call_test_release(p);
return;
}
/* store ptr_ */
WRITE_ONCE(v->unref_ptr, p);
bpf_kfunc_call_test_release(p);
p = bpf_kfunc_call_test_acquire(&(unsigned long){0});
if (!p)
return;
/* store ptr_ */
p = bpf_kptr_xchg(&v->ref_ptr, p);
if (!p)
return;
if (p->a + p->b > 100) {
bpf_kfunc_call_test_release(p);
return;
}
bpf_kfunc_call_test_release(p);
}
static void test_kptr_get(struct map_value *v)
{
struct prog_test_ref_kfunc *p;
p = bpf_kfunc_call_test_kptr_get(&v->ref_ptr, 0, 0);
if (!p)
return;
if (p->a + p->b > 100) {
bpf_kfunc_call_test_release(p);
return;
}
bpf_kfunc_call_test_release(p);
}
static void test_kptr(struct map_value *v)
{
test_kptr_unref(v);
test_kptr_ref(v);
test_kptr_get(v);
}
SEC("tc")
int test_map_kptr(struct __sk_buff *ctx)
{
struct map_value *v;
int key = 0;
#define TEST(map) \
v = bpf_map_lookup_elem(&map, &key); \
if (!v) \
return 0; \
test_kptr(v)
TEST(array_map);
TEST(hash_map);
TEST(hash_malloc_map);
TEST(lru_hash_map);
#undef TEST
return 0;
}
SEC("tc")
int test_map_in_map_kptr(struct __sk_buff *ctx)
{
struct map_value *v;
int key = 0;
void *map;
#define TEST(map_in_map) \
map = bpf_map_lookup_elem(&map_in_map, &key); \
if (!map) \
return 0; \
v = bpf_map_lookup_elem(map, &key); \
if (!v) \
return 0; \
test_kptr(v)
TEST(array_of_array_maps);
TEST(array_of_hash_maps);
TEST(array_of_hash_malloc_maps);
TEST(array_of_lru_hash_maps);
TEST(hash_of_array_maps);
TEST(hash_of_hash_maps);
TEST(hash_of_hash_malloc_maps);
TEST(hash_of_lru_hash_maps);
#undef TEST
return 0;
}
SEC("tc")
int test_map_kptr_ref(struct __sk_buff *ctx)
{
struct prog_test_ref_kfunc *p, *p_st;
unsigned long arg = 0;
struct map_value *v;
int key = 0, ret;
p = bpf_kfunc_call_test_acquire(&arg);
if (!p)
return 1;
p_st = p->next;
if (p_st->cnt.refs.counter != 2) {
ret = 2;
goto end;
}
v = bpf_map_lookup_elem(&array_map, &key);
if (!v) {
ret = 3;
goto end;
}
p = bpf_kptr_xchg(&v->ref_ptr, p);
if (p) {
ret = 4;
goto end;
}
if (p_st->cnt.refs.counter != 2)
return 5;
p = bpf_kfunc_call_test_kptr_get(&v->ref_ptr, 0, 0);
if (!p)
return 6;
if (p_st->cnt.refs.counter != 3) {
ret = 7;
goto end;
}
bpf_kfunc_call_test_release(p);
if (p_st->cnt.refs.counter != 2)
return 8;
p = bpf_kptr_xchg(&v->ref_ptr, NULL);
if (!p)
return 9;
bpf_kfunc_call_test_release(p);
if (p_st->cnt.refs.counter != 1)
return 10;
p = bpf_kfunc_call_test_acquire(&arg);
if (!p)
return 11;
p = bpf_kptr_xchg(&v->ref_ptr, p);
if (p) {
ret = 12;
goto end;
}
if (p_st->cnt.refs.counter != 2)
return 13;
/* Leave in map */
return 0;
end:
bpf_kfunc_call_test_release(p);
return ret;
}
SEC("tc")
int test_map_kptr_ref2(struct __sk_buff *ctx)
{
struct prog_test_ref_kfunc *p, *p_st;
struct map_value *v;
int key = 0;
v = bpf_map_lookup_elem(&array_map, &key);
if (!v)
return 1;
p_st = v->ref_ptr;
if (!p_st || p_st->cnt.refs.counter != 2)
return 2;
p = bpf_kptr_xchg(&v->ref_ptr, NULL);
if (!p)
return 3;
if (p_st->cnt.refs.counter != 2) {
bpf_kfunc_call_test_release(p);
return 4;
}
p = bpf_kptr_xchg(&v->ref_ptr, p);
if (p) {
bpf_kfunc_call_test_release(p);
return 5;
}
if (p_st->cnt.refs.counter != 2)
return 6;
return 0;
}
char _license[] SEC("license") = "GPL";
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