1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2019 Facebook */
 3#include <test_progs.h>
 4
 5/* that's kernel internal BPF_MAX_TRAMP_PROGS define */
 6#define CNT 38
 7
 8void test_fexit_stress(void)
 9{
10	char test_skb[128] = {};
11	int fexit_fd[CNT] = {};
12	int link_fd[CNT] = {};
13	__u32 duration = 0;
14	char error[4096];
15	__u32 prog_ret;
16	int err, i, filter_fd;
17
18	const struct bpf_insn trace_program[] = {
19		BPF_MOV64_IMM(BPF_REG_0, 0),
20		BPF_EXIT_INSN(),
21	};
22
23	struct bpf_load_program_attr load_attr = {
24		.prog_type = BPF_PROG_TYPE_TRACING,
25		.license = "GPL",
26		.insns = trace_program,
27		.insns_cnt = sizeof(trace_program) / sizeof(struct bpf_insn),
28		.expected_attach_type = BPF_TRACE_FEXIT,
29	};
30
31	const struct bpf_insn skb_program[] = {
32		BPF_MOV64_IMM(BPF_REG_0, 0),
33		BPF_EXIT_INSN(),
34	};
35
36	struct bpf_load_program_attr skb_load_attr = {
37		.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
38		.license = "GPL",
39		.insns = skb_program,
40		.insns_cnt = sizeof(skb_program) / sizeof(struct bpf_insn),
41	};
42
43	err = libbpf_find_vmlinux_btf_id("bpf_fentry_test1",
44					 load_attr.expected_attach_type);
45	if (CHECK(err <= 0, "find_vmlinux_btf_id", "failed: %d\n", err))
46		goto out;
47	load_attr.attach_btf_id = err;
48
49	for (i = 0; i < CNT; i++) {
50		fexit_fd[i] = bpf_load_program_xattr(&load_attr, error, sizeof(error));
51		if (CHECK(fexit_fd[i] < 0, "fexit loaded",
52			  "failed: %d errno %d\n", fexit_fd[i], errno))
53			goto out;
54		link_fd[i] = bpf_raw_tracepoint_open(NULL, fexit_fd[i]);
55		if (CHECK(link_fd[i] < 0, "fexit attach failed",
56			  "prog %d failed: %d err %d\n", i, link_fd[i], errno))
57			goto out;
58	}
59
60	filter_fd = bpf_load_program_xattr(&skb_load_attr, error, sizeof(error));
61	if (CHECK(filter_fd < 0, "test_program_loaded", "failed: %d errno %d\n",
62		  filter_fd, errno))
63		goto out;
64
65	err = bpf_prog_test_run(filter_fd, 1, test_skb, sizeof(test_skb), 0,
66				0, &prog_ret, 0);
67	close(filter_fd);
68	CHECK_FAIL(err);
69out:
70	for (i = 0; i < CNT; i++) {
71		if (link_fd[i])
72			close(link_fd[i]);
73		if (fexit_fd[i])
74			close(fexit_fd[i]);
75	}
76}