1 // SPDX-License-Identifier: GPL-2.0
3 #include <bpf/bpf_tracing.h>
4 #include <bpf/bpf_helpers.h>
5 #include <bpf/bpf_core_read.h>
6 #include "bpf_experimental.h"
12 struct bpf_rb_node node;
15 #define private(name) SEC(".data." #name) __hidden __attribute__((aligned(8)))
16 private(A) struct bpf_spin_lock glock;
17 private(A) struct bpf_rb_root groot __contains(node_data, node);
18 private(A) struct bpf_rb_root groot2 __contains(node_data, node);
20 static bool less(struct bpf_rb_node *a, const struct bpf_rb_node *b)
22 struct node_data *node_a;
23 struct node_data *node_b;
25 node_a = container_of(a, struct node_data, node);
26 node_b = container_of(b, struct node_data, node);
28 return node_a->key < node_b->key;
32 __failure __msg("bpf_spin_lock at off=16 must be held for bpf_rb_root")
33 long rbtree_api_nolock_add(void *ctx)
37 n = bpf_obj_new(typeof(*n));
41 bpf_rbtree_add(&groot, &n->node, less);
46 __failure __msg("bpf_spin_lock at off=16 must be held for bpf_rb_root")
47 long rbtree_api_nolock_remove(void *ctx)
51 n = bpf_obj_new(typeof(*n));
55 bpf_spin_lock(&glock);
56 bpf_rbtree_add(&groot, &n->node, less);
57 bpf_spin_unlock(&glock);
59 bpf_rbtree_remove(&groot, &n->node);
64 __failure __msg("bpf_spin_lock at off=16 must be held for bpf_rb_root")
65 long rbtree_api_nolock_first(void *ctx)
67 bpf_rbtree_first(&groot);
72 __failure __msg("rbtree_remove node input must be non-owning ref")
73 long rbtree_api_remove_unadded_node(void *ctx)
75 struct node_data *n, *m;
76 struct bpf_rb_node *res;
78 n = bpf_obj_new(typeof(*n));
82 m = bpf_obj_new(typeof(*m));
88 bpf_spin_lock(&glock);
89 bpf_rbtree_add(&groot, &n->node, less);
91 /* This remove should pass verifier */
92 res = bpf_rbtree_remove(&groot, &n->node);
93 n = container_of(res, struct node_data, node);
95 /* This remove shouldn't, m isn't in an rbtree */
96 res = bpf_rbtree_remove(&groot, &m->node);
97 m = container_of(res, struct node_data, node);
98 bpf_spin_unlock(&glock);
108 __failure __msg("Unreleased reference id=3 alloc_insn=10")
109 long rbtree_api_remove_no_drop(void *ctx)
111 struct bpf_rb_node *res;
114 bpf_spin_lock(&glock);
115 res = bpf_rbtree_first(&groot);
119 res = bpf_rbtree_remove(&groot, res);
122 n = container_of(res, struct node_data, node);
125 bpf_spin_unlock(&glock);
127 /* if (res) { bpf_obj_drop(n); } is missing here */
131 bpf_spin_unlock(&glock);
136 __failure __msg("arg#1 expected pointer to allocated object")
137 long rbtree_api_add_to_multiple_trees(void *ctx)
141 n = bpf_obj_new(typeof(*n));
145 bpf_spin_lock(&glock);
146 bpf_rbtree_add(&groot, &n->node, less);
148 /* This add should fail since n already in groot's tree */
149 bpf_rbtree_add(&groot2, &n->node, less);
150 bpf_spin_unlock(&glock);
155 __failure __msg("dereference of modified ptr_or_null_ ptr R2 off=16 disallowed")
156 long rbtree_api_use_unchecked_remove_retval(void *ctx)
158 struct bpf_rb_node *res;
160 bpf_spin_lock(&glock);
162 res = bpf_rbtree_first(&groot);
165 res = bpf_rbtree_remove(&groot, res);
167 bpf_spin_unlock(&glock);
169 bpf_spin_lock(&glock);
170 /* Must check res for NULL before using in rbtree_add below */
171 bpf_rbtree_add(&groot, res, less);
172 bpf_spin_unlock(&glock);
176 bpf_spin_unlock(&glock);
181 __failure __msg("rbtree_remove node input must be non-owning ref")
182 long rbtree_api_add_release_unlock_escape(void *ctx)
186 n = bpf_obj_new(typeof(*n));
190 bpf_spin_lock(&glock);
191 bpf_rbtree_add(&groot, &n->node, less);
192 bpf_spin_unlock(&glock);
194 bpf_spin_lock(&glock);
195 /* After add() in previous critical section, n should be
196 * release_on_unlock and released after previous spin_unlock,
197 * so should not be possible to use it here
199 bpf_rbtree_remove(&groot, &n->node);
200 bpf_spin_unlock(&glock);
205 __failure __msg("rbtree_remove node input must be non-owning ref")
206 long rbtree_api_first_release_unlock_escape(void *ctx)
208 struct bpf_rb_node *res;
211 bpf_spin_lock(&glock);
212 res = bpf_rbtree_first(&groot);
214 bpf_spin_unlock(&glock);
217 n = container_of(res, struct node_data, node);
218 bpf_spin_unlock(&glock);
220 bpf_spin_lock(&glock);
221 /* After first() in previous critical section, n should be
222 * release_on_unlock and released after previous spin_unlock,
223 * so should not be possible to use it here
225 bpf_rbtree_remove(&groot, &n->node);
226 bpf_spin_unlock(&glock);
230 static bool less__bad_fn_call_add(struct bpf_rb_node *a, const struct bpf_rb_node *b)
232 struct node_data *node_a;
233 struct node_data *node_b;
235 node_a = container_of(a, struct node_data, node);
236 node_b = container_of(b, struct node_data, node);
237 bpf_rbtree_add(&groot, &node_a->node, less);
239 return node_a->key < node_b->key;
242 static bool less__bad_fn_call_remove(struct bpf_rb_node *a, const struct bpf_rb_node *b)
244 struct node_data *node_a;
245 struct node_data *node_b;
247 node_a = container_of(a, struct node_data, node);
248 node_b = container_of(b, struct node_data, node);
249 bpf_rbtree_remove(&groot, &node_a->node);
251 return node_a->key < node_b->key;
254 static bool less__bad_fn_call_first_unlock_after(struct bpf_rb_node *a, const struct bpf_rb_node *b)
256 struct node_data *node_a;
257 struct node_data *node_b;
259 node_a = container_of(a, struct node_data, node);
260 node_b = container_of(b, struct node_data, node);
261 bpf_rbtree_first(&groot);
262 bpf_spin_unlock(&glock);
264 return node_a->key < node_b->key;
267 static __always_inline
268 long add_with_cb(bool (cb)(struct bpf_rb_node *a, const struct bpf_rb_node *b))
272 n = bpf_obj_new(typeof(*n));
276 bpf_spin_lock(&glock);
277 bpf_rbtree_add(&groot, &n->node, cb);
278 bpf_spin_unlock(&glock);
283 __failure __msg("arg#1 expected pointer to allocated object")
284 long rbtree_api_add_bad_cb_bad_fn_call_add(void *ctx)
286 return add_with_cb(less__bad_fn_call_add);
290 __failure __msg("rbtree_remove not allowed in rbtree cb")
291 long rbtree_api_add_bad_cb_bad_fn_call_remove(void *ctx)
293 return add_with_cb(less__bad_fn_call_remove);
297 __failure __msg("can't spin_{lock,unlock} in rbtree cb")
298 long rbtree_api_add_bad_cb_bad_fn_call_first_unlock_after(void *ctx)
300 return add_with_cb(less__bad_fn_call_first_unlock_after);
303 char _license[] SEC("license") = "GPL";