1// SPDX-License-Identifier: GPL-2.0
  2/* Copyright (c) 2019 Facebook */
  3#include <test_progs.h>
  4#include <network_helpers.h>
  5
  6static void test_fexit_bpf2bpf_common(const char *obj_file,
  7				      const char *target_obj_file,
  8				      int prog_cnt,
  9				      const char **prog_name,
 10				      bool run_prog)
 11{
 12	struct bpf_object *obj = NULL, *pkt_obj;
 13	int err, pkt_fd, i;
 14	struct bpf_link **link = NULL;
 15	struct bpf_program **prog = NULL;
 16	__u32 duration = 0, retval;
 17	struct bpf_map *data_map;
 18	const int zero = 0;
 19	__u64 *result = NULL;
 20
 21	err = bpf_prog_load(target_obj_file, BPF_PROG_TYPE_UNSPEC,
 22			    &pkt_obj, &pkt_fd);
 23	if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n",
 24		  target_obj_file, err, errno))
 25		return;
 26	DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
 27			    .attach_prog_fd = pkt_fd,
 28			   );
 29
 30	link = calloc(sizeof(struct bpf_link *), prog_cnt);
 31	prog = calloc(sizeof(struct bpf_program *), prog_cnt);
 32	result = malloc((prog_cnt + 32 /* spare */) * sizeof(__u64));
 33	if (CHECK(!link || !prog || !result, "alloc_memory",
 34		  "failed to alloc memory"))
 35		goto close_prog;
 36
 37	obj = bpf_object__open_file(obj_file, &opts);
 38	if (CHECK(IS_ERR_OR_NULL(obj), "obj_open",
 39		  "failed to open %s: %ld\n", obj_file,
 40		  PTR_ERR(obj)))
 41		goto close_prog;
 42
 43	err = bpf_object__load(obj);
 44	if (CHECK(err, "obj_load", "err %d\n", err))
 45		goto close_prog;
 46
 47	for (i = 0; i < prog_cnt; i++) {
 48		prog[i] = bpf_object__find_program_by_title(obj, prog_name[i]);
 49		if (CHECK(!prog[i], "find_prog", "prog %s not found\n", prog_name[i]))
 50			goto close_prog;
 51		link[i] = bpf_program__attach_trace(prog[i]);
 52		if (CHECK(IS_ERR(link[i]), "attach_trace", "failed to link\n"))
 53			goto close_prog;
 54	}
 55
 56	if (!run_prog)
 57		goto close_prog;
 58
 59	data_map = bpf_object__find_map_by_name(obj, "fexit_bp.bss");
 60	if (CHECK(!data_map, "find_data_map", "data map not found\n"))
 61		goto close_prog;
 62
 63	err = bpf_prog_test_run(pkt_fd, 1, &pkt_v6, sizeof(pkt_v6),
 64				NULL, NULL, &retval, &duration);
 65	CHECK(err || retval, "ipv6",
 66	      "err %d errno %d retval %d duration %d\n",
 67	      err, errno, retval, duration);
 68
 69	err = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, result);
 70	if (CHECK(err, "get_result",
 71		  "failed to get output data: %d\n", err))
 72		goto close_prog;
 73
 74	for (i = 0; i < prog_cnt; i++)
 75		if (CHECK(result[i] != 1, "result", "fexit_bpf2bpf failed err %llu\n",
 76			  result[i]))
 77			goto close_prog;
 78
 79close_prog:
 80	for (i = 0; i < prog_cnt; i++)
 81		if (!IS_ERR_OR_NULL(link[i]))
 82			bpf_link__destroy(link[i]);
 83	if (!IS_ERR_OR_NULL(obj))
 84		bpf_object__close(obj);
 85	bpf_object__close(pkt_obj);
 86	free(link);
 87	free(prog);
 88	free(result);
 89}
 90
 91static void test_target_no_callees(void)
 92{
 93	const char *prog_name[] = {
 94		"fexit/test_pkt_md_access",
 95	};
 96	test_fexit_bpf2bpf_common("./fexit_bpf2bpf_simple.o",
 97				  "./test_pkt_md_access.o",
 98				  ARRAY_SIZE(prog_name),
 99				  prog_name, true);
100}
101
102static void test_target_yes_callees(void)
103{
104	const char *prog_name[] = {
105		"fexit/test_pkt_access",
106		"fexit/test_pkt_access_subprog1",
107		"fexit/test_pkt_access_subprog2",
108		"fexit/test_pkt_access_subprog3",
109	};
110	test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o",
111				  "./test_pkt_access.o",
112				  ARRAY_SIZE(prog_name),
113				  prog_name, true);
114}
115
116static void test_func_replace(void)
117{
118	const char *prog_name[] = {
119		"fexit/test_pkt_access",
120		"fexit/test_pkt_access_subprog1",
121		"fexit/test_pkt_access_subprog2",
122		"fexit/test_pkt_access_subprog3",
123		"freplace/get_skb_len",
124		"freplace/get_skb_ifindex",
125		"freplace/get_constant",
126	};
127	test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o",
128				  "./test_pkt_access.o",
129				  ARRAY_SIZE(prog_name),
130				  prog_name, true);
131}
132
133static void test_func_replace_verify(void)
134{
135	const char *prog_name[] = {
136		"freplace/do_bind",
137	};
138	test_fexit_bpf2bpf_common("./freplace_connect4.o",
139				  "./connect4_prog.o",
140				  ARRAY_SIZE(prog_name),
141				  prog_name, false);
142}
143
144void test_fexit_bpf2bpf(void)
145{
146	test_target_no_callees();
147	test_target_yes_callees();
148	test_func_replace();
149	test_func_replace_verify();
150}