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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>
#include "cgrp_kfunc_common.h"
char _license[] SEC("license") = "GPL";
int err, pid, invocations;
/* Prototype for all of the program trace events below:
*
* TRACE_EVENT(cgroup_mkdir,
* TP_PROTO(struct cgroup *cgrp, const char *path),
* TP_ARGS(cgrp, path)
*/
static bool is_test_kfunc_task(void)
{
int cur_pid = bpf_get_current_pid_tgid() >> 32;
bool same = pid == cur_pid;
if (same)
__sync_fetch_and_add(&invocations, 1);
return same;
}
SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_cgrp_acquire_release_argument, struct cgroup *cgrp, const char *path)
{
struct cgroup *acquired;
if (!is_test_kfunc_task())
return 0;
acquired = bpf_cgroup_acquire(cgrp);
if (!acquired)
err = 1;
else
bpf_cgroup_release(acquired);
return 0;
}
SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_cgrp_acquire_leave_in_map, struct cgroup *cgrp, const char *path)
{
long status;
if (!is_test_kfunc_task())
return 0;
status = cgrps_kfunc_map_insert(cgrp);
if (status)
err = 1;
return 0;
}
SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_cgrp_xchg_release, struct cgroup *cgrp, const char *path)
{
struct cgroup *kptr, *cg;
struct __cgrps_kfunc_map_value *v;
long status;
if (!is_test_kfunc_task())
return 0;
status = cgrps_kfunc_map_insert(cgrp);
if (status) {
err = 1;
return 0;
}
v = cgrps_kfunc_map_value_lookup(cgrp);
if (!v) {
err = 2;
return 0;
}
kptr = v->cgrp;
if (!kptr) {
err = 4;
return 0;
}
cg = bpf_cgroup_ancestor(kptr, 1);
if (cg) /* verifier only check */
bpf_cgroup_release(cg);
kptr = bpf_kptr_xchg(&v->cgrp, NULL);
if (!kptr) {
err = 3;
return 0;
}
bpf_cgroup_release(kptr);
return 0;
}
SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_cgrp_get_release, struct cgroup *cgrp, const char *path)
{
struct cgroup *kptr;
struct __cgrps_kfunc_map_value *v;
long status;
if (!is_test_kfunc_task())
return 0;
status = cgrps_kfunc_map_insert(cgrp);
if (status) {
err = 1;
return 0;
}
v = cgrps_kfunc_map_value_lookup(cgrp);
if (!v) {
err = 2;
return 0;
}
bpf_rcu_read_lock();
kptr = v->cgrp;
if (!kptr)
err = 3;
bpf_rcu_read_unlock();
return 0;
}
SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_cgrp_get_ancestors, struct cgroup *cgrp, const char *path)
{
struct cgroup *self, *ancestor1, *invalid;
if (!is_test_kfunc_task())
return 0;
self = bpf_cgroup_ancestor(cgrp, cgrp->level);
if (!self) {
err = 1;
return 0;
}
if (self->self.id != cgrp->self.id) {
bpf_cgroup_release(self);
err = 2;
return 0;
}
bpf_cgroup_release(self);
ancestor1 = bpf_cgroup_ancestor(cgrp, cgrp->level - 1);
if (!ancestor1) {
err = 3;
return 0;
}
bpf_cgroup_release(ancestor1);
invalid = bpf_cgroup_ancestor(cgrp, 10000);
if (invalid) {
bpf_cgroup_release(invalid);
err = 4;
return 0;
}
invalid = bpf_cgroup_ancestor(cgrp, -1);
if (invalid) {
bpf_cgroup_release(invalid);
err = 5;
return 0;
}
return 0;
}
SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_cgrp_from_id, struct cgroup *cgrp, const char *path)
{
struct cgroup *parent, *res;
u64 parent_cgid;
if (!is_test_kfunc_task())
return 0;
/* @cgrp's ID is not visible yet, let's test with the parent */
parent = bpf_cgroup_ancestor(cgrp, cgrp->level - 1);
if (!parent) {
err = 1;
return 0;
}
parent_cgid = parent->kn->id;
bpf_cgroup_release(parent);
res = bpf_cgroup_from_id(parent_cgid);
if (!res) {
err = 2;
return 0;
}
bpf_cgroup_release(res);
if (res != parent) {
err = 3;
return 0;
}
res = bpf_cgroup_from_id((u64)-1);
if (res) {
bpf_cgroup_release(res);
err = 4;
return 0;
}
return 0;
}
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