// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <test_progs.h>
#include <network_helpers.h>
#include <bpf/btf.h>
#include "bind4_prog.skel.h"
#include "freplace_progmap.skel.h"
#include "xdp_dummy.skel.h"
typedef int (*test_cb)(struct bpf_object *obj);
static int check_data_map(struct bpf_object *obj, int prog_cnt, bool reset)
{
struct bpf_map *data_map = NULL, *map;
__u64 *result = NULL;
const int zero = 0;
__u32 duration = 0;
int ret = -1, i;
result = malloc((prog_cnt + 32 /* spare */) * sizeof(__u64));
if (CHECK(!result, "alloc_memory", "failed to alloc memory"))
return -ENOMEM;
bpf_object__for_each_map(map, obj)
if (bpf_map__is_internal(map)) {
data_map = map;
break;
}
if (CHECK(!data_map, "find_data_map", "data map not found\n"))
goto out;
ret = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, result);
if (CHECK(ret, "get_result",
"failed to get output data: %d\n", ret))
goto out;
for (i = 0; i < prog_cnt; i++) {
if (CHECK(result[i] != 1, "result",
"fexit_bpf2bpf result[%d] failed err %llu\n",
i, result[i]))
goto out;
result[i] = 0;
}
if (reset) {
ret = bpf_map_update_elem(bpf_map__fd(data_map), &zero, result, 0);
if (CHECK(ret, "reset_result", "failed to reset result\n"))
goto out;
}
ret = 0;
out:
free(result);
return ret;
}
static void test_fexit_bpf2bpf_common(const char *obj_file,
const char *target_obj_file,
int prog_cnt,
const char **prog_name,
bool run_prog,
test_cb cb)
{
struct bpf_object *obj = NULL, *tgt_obj;
__u32 tgt_prog_id, info_len;
struct bpf_prog_info prog_info = {};
struct bpf_program **prog = NULL, *p;
struct bpf_link **link = NULL;
int err, tgt_fd, i;
struct btf *btf;
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v6,
.data_size_in = sizeof(pkt_v6),
.repeat = 1,
);
err = bpf_prog_test_load(target_obj_file, BPF_PROG_TYPE_UNSPEC,
&tgt_obj, &tgt_fd);
if (!ASSERT_OK(err, "tgt_prog_load"))
return;
info_len = sizeof(prog_info);
err = bpf_prog_get_info_by_fd(tgt_fd, &prog_info, &info_len);
if (!ASSERT_OK(err, "tgt_fd_get_info"))
goto close_prog;
tgt_prog_id = prog_info.id;
btf = bpf_object__btf(tgt_obj);
link = calloc(sizeof(struct bpf_link *), prog_cnt);
if (!ASSERT_OK_PTR(link, "link_ptr"))
goto close_prog;
prog = calloc(sizeof(struct bpf_program *), prog_cnt);
if (!ASSERT_OK_PTR(prog, "prog_ptr"))
goto close_prog;
obj = bpf_object__open_file(obj_file, NULL);
if (!ASSERT_OK_PTR(obj, "obj_open"))
goto close_prog;
bpf_object__for_each_program(p, obj) {
err = bpf_program__set_attach_target(p, tgt_fd, NULL);
ASSERT_OK(err, "set_attach_target");
}
err = bpf_object__load(obj);
if (!ASSERT_OK(err, "obj_load"))
goto close_prog;
for (i = 0; i < prog_cnt; i++) {
struct bpf_link_info link_info;
struct bpf_program *pos;
const char *pos_sec_name;
char *tgt_name;
__s32 btf_id;
tgt_name = strstr(prog_name[i], "/");
if (!ASSERT_OK_PTR(tgt_name, "tgt_name"))
goto close_prog;
btf_id = btf__find_by_name_kind(btf, tgt_name + 1, BTF_KIND_FUNC);
prog[i] = NULL;
bpf_object__for_each_program(pos, obj) {
pos_sec_name = bpf_program__section_name(pos);
if (pos_sec_name && !strcmp(pos_sec_name, prog_name[i])) {
prog[i] = pos;
break;
}
}
if (!ASSERT_OK_PTR(prog[i], prog_name[i]))
goto close_prog;
link[i] = bpf_program__attach_trace(prog[i]);
if (!ASSERT_OK_PTR(link[i], "attach_trace"))
goto close_prog;
info_len = sizeof(link_info);
memset(&link_info, 0, sizeof(link_info));
err = bpf_link_get_info_by_fd(bpf_link__fd(link[i]),
&link_info, &info_len);
ASSERT_OK(err, "link_fd_get_info");
ASSERT_EQ(link_info.tracing.attach_type,
bpf_program__expected_attach_type(prog[i]),
"link_attach_type");
ASSERT_EQ(link_info.tracing.target_obj_id, tgt_prog_id, "link_tgt_obj_id");
ASSERT_EQ(link_info.tracing.target_btf_id, btf_id, "link_tgt_btf_id");
}
if (cb) {
err = cb(obj);
if (err)
goto close_prog;
}
if (!run_prog)
goto close_prog;
err = bpf_prog_test_run_opts(tgt_fd, &topts);
ASSERT_OK(err, "prog_run");
ASSERT_EQ(topts.retval, 0, "prog_run_ret");
if (check_data_map(obj, prog_cnt, false))
goto close_prog;
close_prog:
for (i = 0; i < prog_cnt; i++)
bpf_link__destroy(link[i]);
bpf_object__close(obj);
bpf_object__close(tgt_obj);
free(link);
free(prog);
}
static void test_target_no_callees(void)
{
const char *prog_name[] = {
"fexit/test_pkt_md_access",
};
test_fexit_bpf2bpf_common("./fexit_bpf2bpf_simple.bpf.o",
"./test_pkt_md_access.bpf.o",
ARRAY_SIZE(prog_name),
prog_name, true, NULL);
}
static void test_target_yes_callees(void)
{
const char *prog_name[] = {
"fexit/test_pkt_access",
"fexit/test_pkt_access_subprog1",
"fexit/test_pkt_access_subprog2",
"fexit/test_pkt_access_subprog3",
};
test_fexit_bpf2bpf_common("./fexit_bpf2bpf.bpf.o",
"./test_pkt_access.bpf.o",
ARRAY_SIZE(prog_name),
prog_name, true, NULL);
}
static void test_func_replace(void)
{
const char *prog_name[] = {
"fexit/test_pkt_access",
"fexit/test_pkt_access_subprog1",
"fexit/test_pkt_access_subprog2",
"fexit/test_pkt_access_subprog3",
"freplace/get_skb_len",
"freplace/get_skb_ifindex",
"freplace/get_constant",
"freplace/test_pkt_write_access_subprog",
};
test_fexit_bpf2bpf_common("./fexit_bpf2bpf.bpf.o",
"./test_pkt_access.bpf.o",
ARRAY_SIZE(prog_name),
prog_name, true, NULL);
}
static void test_func_replace_verify(void)
{
const char *prog_name[] = {
"freplace/do_bind",
};
test_fexit_bpf2bpf_common("./freplace_connect4.bpf.o",
"./connect4_prog.bpf.o",
ARRAY_SIZE(prog_name),
prog_name, false, NULL);
}
static int test_second_attach(struct bpf_object *obj)
{
const char *prog_name = "security_new_get_constant";
const char *tgt_name = "get_constant";
const char *tgt_obj_file = "./test_pkt_access.bpf.o";
struct bpf_program *prog = NULL;
struct bpf_object *tgt_obj;
struct bpf_link *link;
int err = 0, tgt_fd;
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v6,
.data_size_in = sizeof(pkt_v6),
.repeat = 1,
);
prog = bpf_object__find_program_by_name(obj, prog_name);
if (!ASSERT_OK_PTR(prog, "find_prog"))
return -ENOENT;
err = bpf_prog_test_load(tgt_obj_file, BPF_PROG_TYPE_UNSPEC,
&tgt_obj, &tgt_fd);
if (!ASSERT_OK(err, "second_prog_load"))
return err;
link = bpf_program__attach_freplace(prog, tgt_fd, tgt_name);
if (!ASSERT_OK_PTR(link, "second_link"))
goto out;
err = bpf_prog_test_run_opts(tgt_fd, &topts);
if (!ASSERT_OK(err, "ipv6 test_run"))
goto out;
if (!ASSERT_OK(topts.retval, "ipv6 retval"))
goto out;
err = check_data_map(obj, 1, true);
if (err)
goto out;
out:
bpf_link__destroy(link);
bpf_object__close(tgt_obj);
return err;
}
static void test_func_replace_multi(void)
{
const char *prog_name[] = {
"freplace/get_constant",
};
test_fexit_bpf2bpf_common("./freplace_get_constant.bpf.o",
"./test_pkt_access.bpf.o",
ARRAY_SIZE(prog_name),
prog_name, true, test_second_attach);
}
static void test_fmod_ret_freplace(void)
{
struct bpf_object *freplace_obj = NULL, *pkt_obj, *fmod_obj = NULL;
const char *freplace_name = "./freplace_get_constant.bpf.o";
const char *fmod_ret_name = "./fmod_ret_freplace.bpf.o";
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts);
const char *tgt_name = "./test_pkt_access.bpf.o";
struct bpf_link *freplace_link = NULL;
struct bpf_program *prog;
__u32 duration = 0;
int err, pkt_fd, attach_prog_fd;
err = bpf_prog_test_load(tgt_name, BPF_PROG_TYPE_UNSPEC,
&pkt_obj, &pkt_fd);
/* the target prog should load fine */
if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n",
tgt_name, err, errno))
return;
freplace_obj = bpf_object__open_file(freplace_name, NULL);
if (!ASSERT_OK_PTR(freplace_obj, "freplace_obj_open"))
goto out;
prog = bpf_object__next_program(freplace_obj, NULL);
err = bpf_program__set_attach_target(prog, pkt_fd, NULL);
ASSERT_OK(err, "freplace__set_attach_target");
err = bpf_object__load(freplace_obj);
if (CHECK(err, "freplace_obj_load", "err %d\n", err))
goto out;
freplace_link = bpf_program__attach_trace(prog);
if (!ASSERT_OK_PTR(freplace_link, "freplace_attach_trace"))
goto out;
fmod_obj = bpf_object__open_file(fmod_ret_name, NULL);
if (!ASSERT_OK_PTR(fmod_obj, "fmod_obj_open"))
goto out;
attach_prog_fd = bpf_program__fd(prog);
prog = bpf_object__next_program(fmod_obj, NULL);
err = bpf_program__set_attach_target(prog, attach_prog_fd, NULL);
ASSERT_OK(err, "fmod_ret_set_attach_target");
err = bpf_object__load(fmod_obj);
if (CHECK(!err, "fmod_obj_load", "loading fmod_ret should fail\n"))
goto out;
out:
bpf_link__destroy(freplace_link);
bpf_object__close(freplace_obj);
bpf_object__close(fmod_obj);
bpf_object__close(pkt_obj);
}
static void test_func_sockmap_update(void)
{
const char *prog_name[] = {
"freplace/cls_redirect",
};
test_fexit_bpf2bpf_common("./freplace_cls_redirect.bpf.o",
"./test_cls_redirect.bpf.o",
ARRAY_SIZE(prog_name),
prog_name, false, NULL);
}
static void test_obj_load_failure_common(const char *obj_file,
const char *target_obj_file,
const char *exp_msg)
{
/*
* standalone test that asserts failure to load freplace prog
* because of invalid return code.
*/
struct bpf_object *obj = NULL, *pkt_obj;
struct bpf_program *prog;
char log_buf[64 * 1024];
int err, pkt_fd;
__u32 duration = 0;
err = bpf_prog_test_load(target_obj_file, BPF_PROG_TYPE_UNSPEC,
&pkt_obj, &pkt_fd);
/* the target prog should load fine */
if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n",
target_obj_file, err, errno))
return;
obj = bpf_object__open_file(obj_file, NULL);
if (!ASSERT_OK_PTR(obj, "obj_open"))
goto close_prog;
prog = bpf_object__next_program(obj, NULL);
err = bpf_program__set_attach_target(prog, pkt_fd, NULL);
ASSERT_OK(err, "set_attach_target");
log_buf[0] = '\0';
if (exp_msg)
bpf_program__set_log_buf(prog, log_buf, sizeof(log_buf));
if (env.verbosity > VERBOSE_NONE)
bpf_program__set_log_level(prog, 2);
/* It should fail to load the program */
err = bpf_object__load(obj);
if (env.verbosity > VERBOSE_NONE && exp_msg) /* we overtook log */
printf("VERIFIER LOG:\n================\n%s\n================\n", log_buf);
if (CHECK(!err, "bpf_obj_load should fail", "err %d\n", err))
goto close_prog;
if (exp_msg)
ASSERT_HAS_SUBSTR(log_buf, exp_msg, "fail_msg");
close_prog:
bpf_object__close(obj);
bpf_object__close(pkt_obj);
}
static void test_func_replace_return_code(void)
{
/* test invalid return code in the replaced program */
test_obj_load_failure_common("./freplace_connect_v4_prog.bpf.o",
"./connect4_prog.bpf.o", NULL);
}
static void test_func_map_prog_compatibility(void)
{
/* test with spin lock map value in the replaced program */
test_obj_load_failure_common("./freplace_attach_probe.bpf.o",
"./test_attach_probe.bpf.o", NULL);
}
static void test_func_replace_unreliable(void)
{
/* freplace'ing unreliable main prog should fail with error
* "Cannot replace static functions"
*/
test_obj_load_failure_common("freplace_unreliable_prog.bpf.o",
"./verifier_btf_unreliable_prog.bpf.o",
"Cannot replace static functions");
}
static void test_func_replace_global_func(void)
{
const char *prog_name[] = {
"freplace/test_pkt_access",
};
test_fexit_bpf2bpf_common("./freplace_global_func.bpf.o",
"./test_pkt_access.bpf.o",
ARRAY_SIZE(prog_name),
prog_name, false, NULL);
}
static int find_prog_btf_id(const char *name, __u32 attach_prog_fd)
{
struct bpf_prog_info info = {};
__u32 info_len = sizeof(info);
struct btf *btf;
int ret;
ret = bpf_prog_get_info_by_fd(attach_prog_fd, &info, &info_len);
if (ret)
return ret;
if (!info.btf_id)
return -EINVAL;
btf = btf__load_from_kernel_by_id(info.btf_id);
ret = libbpf_get_error(btf);
if (ret)
return ret;
ret = btf__find_by_name_kind(btf, name, BTF_KIND_FUNC);
btf__free(btf);
return ret;
}
static int load_fentry(int attach_prog_fd, int attach_btf_id)
{
LIBBPF_OPTS(bpf_prog_load_opts, opts,
.expected_attach_type = BPF_TRACE_FENTRY,
.attach_prog_fd = attach_prog_fd,
.attach_btf_id = attach_btf_id,
);
struct bpf_insn insns[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
};
return bpf_prog_load(BPF_PROG_TYPE_TRACING,
"bind4_fentry",
"GPL",
insns,
ARRAY_SIZE(insns),
&opts);
}
static void test_fentry_to_cgroup_bpf(void)
{
struct bind4_prog *skel = NULL;
struct bpf_prog_info info = {};
__u32 info_len = sizeof(info);
int cgroup_fd = -1;
int fentry_fd = -1;
int btf_id;
cgroup_fd = test__join_cgroup("/fentry_to_cgroup_bpf");
if (!ASSERT_GE(cgroup_fd, 0, "cgroup_fd"))
return;
skel = bind4_prog__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel"))
goto cleanup;
skel->links.bind_v4_prog = bpf_program__attach_cgroup(skel->progs.bind_v4_prog, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.bind_v4_prog, "bpf_program__attach_cgroup"))
goto cleanup;
btf_id = find_prog_btf_id("bind_v4_prog", bpf_program__fd(skel->progs.bind_v4_prog));
if (!ASSERT_GE(btf_id, 0, "find_prog_btf_id"))
goto cleanup;
fentry_fd = load_fentry(bpf_program__fd(skel->progs.bind_v4_prog), btf_id);
if (!ASSERT_GE(fentry_fd, 0, "load_fentry"))
goto cleanup;
/* Make sure bpf_prog_get_info_by_fd works correctly when attaching
* to another BPF program.
*/
ASSERT_OK(bpf_prog_get_info_by_fd(fentry_fd, &info, &info_len),
"bpf_prog_get_info_by_fd");
ASSERT_EQ(info.btf_id, 0, "info.btf_id");
ASSERT_EQ(info.attach_btf_id, btf_id, "info.attach_btf_id");
ASSERT_GT(info.attach_btf_obj_id, 0, "info.attach_btf_obj_id");
cleanup:
if (cgroup_fd >= 0)
close(cgroup_fd);
if (fentry_fd >= 0)
close(fentry_fd);
bind4_prog__destroy(skel);
}
static void test_func_replace_progmap(void)
{
struct bpf_cpumap_val value = { .qsize = 1 };
struct freplace_progmap *skel = NULL;
struct xdp_dummy *tgt_skel = NULL;
__u32 key = 0;
int err;
skel = freplace_progmap__open();
if (!ASSERT_OK_PTR(skel, "prog_open"))
return;
tgt_skel = xdp_dummy__open_and_load();
if (!ASSERT_OK_PTR(tgt_skel, "tgt_prog_load"))
goto out;
err = bpf_program__set_attach_target(skel->progs.xdp_cpumap_prog,
bpf_program__fd(tgt_skel->progs.xdp_dummy_prog),
"xdp_dummy_prog");
if (!ASSERT_OK(err, "set_attach_target"))
goto out;
err = freplace_progmap__load(skel);
if (!ASSERT_OK(err, "obj_load"))
goto out;
/* Prior to fixing the kernel, loading the PROG_TYPE_EXT 'redirect'
* program above will cause the map owner type of 'cpumap' to be set to
* PROG_TYPE_EXT. This in turn will cause the bpf_map_update_elem()
* below to fail, because the program we are inserting into the map is
* of PROG_TYPE_XDP. After fixing the kernel, the initial ownership will
* be correctly resolved to the *target* of the PROG_TYPE_EXT program
* (i.e., PROG_TYPE_XDP) and the map update will succeed.
*/
value.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_drop_prog);
err = bpf_map_update_elem(bpf_map__fd(skel->maps.cpu_map),
&key, &value, 0);
ASSERT_OK(err, "map_update");
out:
xdp_dummy__destroy(tgt_skel);
freplace_progmap__destroy(skel);
}
/* NOTE: affect other tests, must run in serial mode */
void serial_test_fexit_bpf2bpf(void)
{
if (test__start_subtest("target_no_callees"))
test_target_no_callees();
if (test__start_subtest("target_yes_callees"))
test_target_yes_callees();
if (test__start_subtest("func_replace"))
test_func_replace();
if (test__start_subtest("func_replace_verify"))
test_func_replace_verify();
if (test__start_subtest("func_sockmap_update"))
test_func_sockmap_update();
if (test__start_subtest("func_replace_return_code"))
test_func_replace_return_code();
if (test__start_subtest("func_map_prog_compatibility"))
test_func_map_prog_compatibility();
if (test__start_subtest("func_replace_unreliable"))
test_func_replace_unreliable();
if (test__start_subtest("func_replace_multi"))
test_func_replace_multi();
if (test__start_subtest("fmod_ret_freplace"))
test_fmod_ret_freplace();
if (test__start_subtest("func_replace_global_func"))
test_func_replace_global_func();
if (test__start_subtest("fentry_to_cgroup_bpf"))
test_fentry_to_cgroup_bpf();
if (test__start_subtest("func_replace_progmap"))
test_func_replace_progmap();
}
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