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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <stdbool.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#define ENOENT 2
#define EEXIST 17
char _license[] SEC("license") = "GPL";
int err;
struct elem {
char arr[128];
int val;
};
struct special_elem {
struct task_struct __kptr *task;
int val;
};
struct {
__uint(type, BPF_MAP_TYPE_RHASH);
__uint(map_flags, BPF_F_NO_PREALLOC);
__uint(max_entries, 128);
__type(key, int);
__type(value, struct elem);
} rhmap SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_RHASH);
__uint(map_flags, BPF_F_NO_PREALLOC);
__uint(max_entries, 1);
__type(key, int);
__type(value, struct special_elem);
} special_fields SEC(".maps");
extern struct task_struct *bpf_task_acquire(struct task_struct *p) __ksym;
extern void bpf_task_release(struct task_struct *p) __ksym;
SEC("syscall")
int test_rhash_lookup_update(void *ctx)
{
int key = 5;
struct elem empty = {.val = 3, .arr = {0}};
struct elem *e;
err = 1;
e = bpf_map_lookup_elem(&rhmap, &key);
if (e)
return 1;
err = bpf_map_update_elem(&rhmap, &key, &empty, BPF_NOEXIST);
if (err)
return 1;
e = bpf_map_lookup_elem(&rhmap, &key);
if (!e || e->val != empty.val) {
err = 2;
return 2;
}
err = 0;
return 0;
}
SEC("syscall")
int test_rhash_update_delete(void *ctx)
{
int key = 6;
struct elem empty = {.val = 4, .arr = {0}};
struct elem *e;
err = 1;
e = bpf_map_lookup_elem(&rhmap, &key);
if (e)
return 1;
err = bpf_map_update_elem(&rhmap, &key, &empty, BPF_NOEXIST);
if (err)
return 2;
err = bpf_map_delete_elem(&rhmap, &key);
if (err)
return 3;
e = bpf_map_lookup_elem(&rhmap, &key);
if (e) {
err = 4;
return 4;
}
err = 0;
return 0;
}
SEC("syscall")
int test_rhash_update_elements(void *ctx)
{
int key = 0;
struct elem empty = {.val = 4, .arr = {0}};
struct elem *e;
int i;
err = 1;
for (i = 0; i < 128; ++i) {
key = i;
e = bpf_map_lookup_elem(&rhmap, &key);
if (e)
return 1;
empty.val = key;
err = bpf_map_update_elem(&rhmap, &key, &empty, BPF_NOEXIST);
if (err)
return 2;
e = bpf_map_lookup_elem(&rhmap, &key);
if (!e || e->val != key) {
err = 4;
return 4;
}
}
for (i = 0; i < 128; ++i) {
key = i;
err = bpf_map_delete_elem(&rhmap, &key);
if (err)
return 3;
e = bpf_map_lookup_elem(&rhmap, &key);
if (e) {
err = 5;
return 5;
}
}
err = 0;
return 0;
}
SEC("syscall")
int test_rhash_update_exist(void *ctx)
{
int key = 10;
struct elem val1 = {.val = 100, .arr = {0}};
struct elem val2 = {.val = 200, .arr = {0}};
struct elem *e;
int ret;
err = 1;
/* BPF_EXIST on non-existent key should fail with -ENOENT */
ret = bpf_map_update_elem(&rhmap, &key, &val1, BPF_EXIST);
if (ret != -ENOENT)
return 1;
/* Insert element first */
ret = bpf_map_update_elem(&rhmap, &key, &val1, BPF_NOEXIST);
if (ret)
return 2;
/* Verify initial value */
e = bpf_map_lookup_elem(&rhmap, &key);
if (!e || e->val != 100)
return 3;
/* BPF_EXIST on existing key should succeed and update value */
ret = bpf_map_update_elem(&rhmap, &key, &val2, BPF_EXIST);
if (ret)
return 4;
/* Verify value was updated */
e = bpf_map_lookup_elem(&rhmap, &key);
if (!e || e->val != 200)
return 5;
/* Cleanup */
bpf_map_delete_elem(&rhmap, &key);
err = 0;
return 0;
}
SEC("syscall")
int test_rhash_update_any(void *ctx)
{
int key = 11;
struct elem val1 = {.val = 111, .arr = {0}};
struct elem val2 = {.val = 222, .arr = {0}};
struct elem *e;
int ret;
err = 1;
/* BPF_ANY on non-existent key should insert */
ret = bpf_map_update_elem(&rhmap, &key, &val1, BPF_ANY);
if (ret)
return 1;
e = bpf_map_lookup_elem(&rhmap, &key);
if (!e || e->val != 111)
return 2;
/* BPF_ANY on existing key should update */
ret = bpf_map_update_elem(&rhmap, &key, &val2, BPF_ANY);
if (ret)
return 3;
e = bpf_map_lookup_elem(&rhmap, &key);
if (!e || e->val != 222)
return 4;
/* Cleanup */
bpf_map_delete_elem(&rhmap, &key);
err = 0;
return 0;
}
SEC("syscall")
int test_rhash_noexist_duplicate(void *ctx)
{
int key = 12;
struct elem val = {.val = 600, .arr = {0}};
int ret;
err = 1;
/* Insert element */
ret = bpf_map_update_elem(&rhmap, &key, &val, BPF_NOEXIST);
if (ret)
return 1;
/* Try to insert again with BPF_NOEXIST - should fail with -EEXIST */
ret = bpf_map_update_elem(&rhmap, &key, &val, BPF_NOEXIST);
if (ret != -EEXIST)
return 2;
/* Cleanup */
bpf_map_delete_elem(&rhmap, &key);
err = 0;
return 0;
}
SEC("syscall")
int test_rhash_delete_nonexistent(void *ctx)
{
int key = 99999;
int ret;
err = 1;
/* Delete non-existent key should return -ENOENT */
ret = bpf_map_delete_elem(&rhmap, &key);
if (ret != -ENOENT)
return 1;
err = 0;
return 0;
}
SEC("syscall")
int test_rhash_kptr_update(void *ctx)
{
struct special_elem val1 = { .val = 1 };
struct special_elem val2 = { .val = 2 };
struct task_struct *task, *old;
struct special_elem *elem;
int key = 0;
err = 1;
if (bpf_map_update_elem(&special_fields, &key, &val1, BPF_NOEXIST))
return 1;
err = 2;
elem = bpf_map_lookup_elem(&special_fields, &key);
if (!elem)
return 2;
err = 3;
task = bpf_task_acquire(bpf_get_current_task_btf());
if (!task)
return 3;
err = 4;
old = bpf_kptr_xchg(&elem->task, task);
if (old) {
bpf_task_release(old);
return 4;
}
err = 5;
if (bpf_map_update_elem(&special_fields, &key, &val2, BPF_EXIST))
return 5;
err = 6;
elem = bpf_map_lookup_elem(&special_fields, &key);
if (!elem || elem->val != 2)
return 6;
err = 7;
old = bpf_kptr_xchg(&elem->task, NULL);
if (!old)
return 7;
bpf_task_release(old);
err = 8;
if (bpf_map_delete_elem(&special_fields, &key))
return 8;
err = 0;
return 0;
}
SEC("syscall")
int test_rhash_kptr_delete(void *ctx)
{
struct special_elem val = {};
struct task_struct *task, *old;
struct special_elem *elem;
int key = 0;
err = 1;
if (bpf_map_update_elem(&special_fields, &key, &val, BPF_NOEXIST))
return 1;
err = 2;
elem = bpf_map_lookup_elem(&special_fields, &key);
if (!elem)
return 2;
err = 3;
task = bpf_task_acquire(bpf_get_current_task_btf());
if (!task)
return 3;
err = 4;
old = bpf_kptr_xchg(&elem->task, task);
if (old) {
bpf_task_release(old);
return 4;
}
err = 5;
if (bpf_map_delete_elem(&special_fields, &key))
return 5;
err = 6;
old = bpf_kptr_xchg(&elem->task, NULL);
if (!old)
return 6;
bpf_task_release(old);
err = 0;
return 0;
}
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