1 // SPDX-License-Identifier: GPL-2.0
3 #include <bpf/bpf_helpers.h>
8 struct bpf_timer timer;
12 __uint(type, BPF_MAP_TYPE_HASH);
13 __uint(max_entries, 64);
15 __type(value, struct hmap_elem);
18 __attribute__((noinline))
19 static int timer_cb(void *map, int *key, struct bpf_timer *timer)
21 volatile char buf[256] = {};
25 __attribute__((noinline))
26 static int bad_timer_cb(void *map, int *key, struct bpf_timer *timer)
28 volatile char buf[300] = {};
29 return buf[255] + timer_cb(NULL, NULL, NULL);
33 __failure __msg("combined stack size of 2 calls is 576. Too large")
34 int pseudo_call_check(struct __sk_buff *ctx)
36 struct hmap_elem *elem;
37 volatile char buf[256] = {};
39 elem = bpf_map_lookup_elem(&hmap, &(int){0});
43 timer_cb(NULL, NULL, NULL);
44 return bpf_timer_set_callback(&elem->timer, timer_cb) + buf[0];
48 __failure __msg("combined stack size of 2 calls is 608. Too large")
49 int async_call_root_check(struct __sk_buff *ctx)
51 struct hmap_elem *elem;
52 volatile char buf[256] = {};
54 elem = bpf_map_lookup_elem(&hmap, &(int){0});
58 return bpf_timer_set_callback(&elem->timer, bad_timer_cb) + buf[0];
61 char _license[] SEC("license") = "GPL";