1 files changed, 246 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/progs/rbtree.c b/tools/testing/selftests/bpf/progs/rbtree.c
new file mode 100644
index 000000000000..b09f4fffe57c
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/rbtree.c
@@ -0,0 +1,246 @@
+// 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 <bpf/bpf_core_read.h>
+#include "bpf_experimental.h"
+
+struct node_data {
+	long key;
+	long data;
+	struct bpf_rb_node node;
+};
+
+long less_callback_ran = -1;
+long removed_key = -1;
+long first_data[2] = {-1, -1};
+
+#define private(name) SEC(".data." #name) __hidden __attribute__((aligned(8)))
+private(A) struct bpf_spin_lock glock;
+private(A) struct bpf_rb_root groot __contains(node_data, node);
+
+static bool less(struct bpf_rb_node *a, const struct bpf_rb_node *b)
+{
+	struct node_data *node_a;
+	struct node_data *node_b;
+
+	node_a = container_of(a, struct node_data, node);
+	node_b = container_of(b, struct node_data, node);
+	less_callback_ran = 1;
+
+	return node_a->key < node_b->key;
+}
+
+static long __add_three(struct bpf_rb_root *root, struct bpf_spin_lock *lock)
+{
+	struct node_data *n, *m;
+
+	n = bpf_obj_new(typeof(*n));
+	if (!n)
+		return 1;
+	n->key = 5;
+
+	m = bpf_obj_new(typeof(*m));
+	if (!m) {
+		bpf_obj_drop(n);
+		return 2;
+	}
+	m->key = 1;
+
+	bpf_spin_lock(&glock);
+	bpf_rbtree_add(&groot, &n->node, less);
+	bpf_rbtree_add(&groot, &m->node, less);
+	bpf_spin_unlock(&glock);
+
+	n = bpf_obj_new(typeof(*n));
+	if (!n)
+		return 3;
+	n->key = 3;
+
+	bpf_spin_lock(&glock);
+	bpf_rbtree_add(&groot, &n->node, less);
+	bpf_spin_unlock(&glock);
+	return 0;
+}
+
+SEC("tc")
+long rbtree_add_nodes(void *ctx)
+{
+	return __add_three(&groot, &glock);
+}
+
+SEC("tc")
+long rbtree_add_and_remove(void *ctx)
+{
+	struct bpf_rb_node *res = NULL;
+	struct node_data *n, *m = NULL;
+
+	n = bpf_obj_new(typeof(*n));
+	if (!n)
+		goto err_out;
+	n->key = 5;
+
+	m = bpf_obj_new(typeof(*m));
+	if (!m)
+		goto err_out;
+	m->key = 3;
+
+	bpf_spin_lock(&glock);
+	bpf_rbtree_add(&groot, &n->node, less);
+	bpf_rbtree_add(&groot, &m->node, less);
+	res = bpf_rbtree_remove(&groot, &n->node);
+	bpf_spin_unlock(&glock);
+
+	if (!res)
+		return 1;
+
+	n = container_of(res, struct node_data, node);
+	removed_key = n->key;
+	bpf_obj_drop(n);
+
+	return 0;
+err_out:
+	if (n)
+		bpf_obj_drop(n);
+	if (m)
+		bpf_obj_drop(m);
+	return 1;
+}
+
+SEC("tc")
+long rbtree_first_and_remove(void *ctx)
+{
+	struct bpf_rb_node *res = NULL;
+	struct node_data *n, *m, *o;
+
+	n = bpf_obj_new(typeof(*n));
+	if (!n)
+		return 1;
+	n->key = 3;
+	n->data = 4;
+
+	m = bpf_obj_new(typeof(*m));
+	if (!m)
+		goto err_out;
+	m->key = 5;
+	m->data = 6;
+
+	o = bpf_obj_new(typeof(*o));
+	if (!o)
+		goto err_out;
+	o->key = 1;
+	o->data = 2;
+
+	bpf_spin_lock(&glock);
+	bpf_rbtree_add(&groot, &n->node, less);
+	bpf_rbtree_add(&groot, &m->node, less);
+	bpf_rbtree_add(&groot, &o->node, less);
+
+	res = bpf_rbtree_first(&groot);
+	if (!res) {
+		bpf_spin_unlock(&glock);
+		return 2;
+	}
+
+	o = container_of(res, struct node_data, node);
+	first_data[0] = o->data;
+
+	res = bpf_rbtree_remove(&groot, &o->node);
+	bpf_spin_unlock(&glock);
+
+	if (!res)
+		return 5;
+
+	o = container_of(res, struct node_data, node);
+	removed_key = o->key;
+	bpf_obj_drop(o);
+
+	bpf_spin_lock(&glock);
+	res = bpf_rbtree_first(&groot);
+	if (!res) {
+		bpf_spin_unlock(&glock);
+		return 3;
+	}
+
+	o = container_of(res, struct node_data, node);
+	first_data[1] = o->data;
+	bpf_spin_unlock(&glock);
+
+	return 0;
+err_out:
+	if (n)
+		bpf_obj_drop(n);
+	if (m)
+		bpf_obj_drop(m);
+	return 1;
+}
+
+SEC("tc")
+long rbtree_api_release_aliasing(void *ctx)
+{
+	struct node_data *n, *m, *o;
+	struct bpf_rb_node *res, *res2;
+
+	n = bpf_obj_new(typeof(*n));
+	if (!n)
+		return 1;
+	n->key = 41;
+	n->data = 42;
+
+	bpf_spin_lock(&glock);
+	bpf_rbtree_add(&groot, &n->node, less);
+	bpf_spin_unlock(&glock);
+
+	bpf_spin_lock(&glock);
+
+	/* m and o point to the same node,
+	 * but verifier doesn't know this
+	 */
+	res = bpf_rbtree_first(&groot);
+	if (!res)
+		goto err_out;
+	o = container_of(res, struct node_data, node);
+
+	res = bpf_rbtree_first(&groot);
+	if (!res)
+		goto err_out;
+	m = container_of(res, struct node_data, node);
+
+	res = bpf_rbtree_remove(&groot, &m->node);
+	/* Retval of previous remove returns an owning reference to m,
+	 * which is the same node non-owning ref o is pointing at.
+	 * We can safely try to remove o as the second rbtree_remove will
+	 * return NULL since the node isn't in a tree.
+	 *
+	 * Previously we relied on the verifier type system + rbtree_remove
+	 * invalidating non-owning refs to ensure that rbtree_remove couldn't
+	 * fail, but now rbtree_remove does runtime checking so we no longer
+	 * invalidate non-owning refs after remove.
+	 */
+	res2 = bpf_rbtree_remove(&groot, &o->node);
+
+	bpf_spin_unlock(&glock);
+
+	if (res) {
+		o = container_of(res, struct node_data, node);
+		first_data[0] = o->data;
+		bpf_obj_drop(o);
+	}
+	if (res2) {
+		/* The second remove fails, so res2 is null and this doesn't
+		 * execute
+		 */
+		m = container_of(res2, struct node_data, node);
+		first_data[1] = m->data;
+		bpf_obj_drop(m);
+	}
+	return 0;
+
+err_out:
+	bpf_spin_unlock(&glock);
+	return 1;
+}
+
+char _license[] SEC("license") = "GPL";