/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include "bpf-foreign.h" #include "load-fragment.h" #include "manager.h" #include "process-util.h" #include "rlimit-util.h" #include "rm-rf.h" #include "service.h" #include "tests.h" #include "unit.h" #include "virt.h" struct Test { const char *option_name; enum bpf_prog_type prog_type; enum bpf_attach_type attach_type; const char *bpffs_path; }; typedef struct Test Test; #define BPFFS_PATH(prog_suffix) ("/sys/fs/bpf/test-bpf-foreing-" # prog_suffix) static const Test single_prog[] = { { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SKB, .attach_type = BPF_CGROUP_INET_INGRESS, .bpffs_path = BPFFS_PATH("trivial-skb"), }, }; static const Test path_split_test[] = { { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SKB, .attach_type = BPF_CGROUP_INET_INGRESS, .bpffs_path = BPFFS_PATH("path:split:test"), }, }; static const Test same_prog_same_hook[] = { { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SOCK, .attach_type = BPF_CGROUP_INET_SOCK_CREATE, .bpffs_path = BPFFS_PATH("trivial-sock"), }, { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SOCK, .attach_type = BPF_CGROUP_INET_SOCK_CREATE, .bpffs_path = BPFFS_PATH("trivial-sock"), } }; static const Test multi_prog_same_hook[] = { { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SOCK, .attach_type = BPF_CGROUP_INET_SOCK_CREATE, .bpffs_path = BPFFS_PATH("trivial-sock-0"), }, { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SOCK, .attach_type = BPF_CGROUP_INET_SOCK_CREATE, .bpffs_path = BPFFS_PATH("trivial-sock-1"), } }; static const Test same_prog_multi_hook[] = { { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SKB, .attach_type = BPF_CGROUP_INET_INGRESS, .bpffs_path = BPFFS_PATH("trivial-skb"), }, { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SKB, .attach_type = BPF_CGROUP_INET_EGRESS, .bpffs_path = BPFFS_PATH("trivial-skb"), } }; static const Test same_prog_multi_option_0[] = { { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SKB, .attach_type = BPF_CGROUP_INET_INGRESS, .bpffs_path = BPFFS_PATH("trivial-skb"), }, { .option_name = "IPIngressFilterPath", .prog_type = BPF_PROG_TYPE_CGROUP_SKB, .attach_type = BPF_CGROUP_INET_INGRESS, .bpffs_path = BPFFS_PATH("trivial-skb"), } }; static const Test same_prog_multi_option_1[] = { { .option_name = "IPEgressFilterPath", .prog_type = BPF_PROG_TYPE_CGROUP_SKB, .attach_type = BPF_CGROUP_INET_EGRESS, .bpffs_path = BPFFS_PATH("trivial-skb"), }, { .option_name = "BPFProgram", .prog_type = BPF_PROG_TYPE_CGROUP_SKB, .attach_type = BPF_CGROUP_INET_EGRESS, .bpffs_path = BPFFS_PATH("trivial-skb"), } }; #undef BPFFS_PATH static int bpf_foreign_test_to_string(enum bpf_attach_type attach_type, const char *bpffs_path, char **ret_str) { const char *s = NULL; assert_se(bpffs_path); assert_se(ret_str); assert_se(s = bpf_cgroup_attach_type_to_string(attach_type)); assert_se(*ret_str = strjoin(s, ":", bpffs_path)); return 0; } static char **unlink_paths_and_free(char **paths) { STRV_FOREACH(i, paths) (void) unlink(*i); return strv_free(paths); } DEFINE_TRIVIAL_CLEANUP_FUNC(char **, unlink_paths_and_free); static int pin_programs(Unit *u, CGroupContext *cc, const Test *test_suite, size_t test_suite_size, char ***paths_ret) { _cleanup_(unlink_paths_and_freep) char **bpffs_paths = NULL; static const struct bpf_insn trivial[] = { BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN() }; char log_buf[0xffff]; int r; assert_se(paths_ret); for (size_t i = 0; i < test_suite_size; i++) { _cleanup_(bpf_program_freep) BPFProgram *prog = NULL; _cleanup_free_ char *str = NULL; r = bpf_foreign_test_to_string(test_suite[i].attach_type, test_suite[i].bpffs_path, &str); if (r < 0) return log_error_errno(r, "Failed to convert program to string"); r = bpf_program_new(test_suite[i].prog_type, "sd_trivial", &prog); if (r < 0) return log_error_errno(r, "Failed to create program '%s'", str); r = bpf_program_add_instructions(prog, trivial, ELEMENTSOF(trivial)); if (r < 0) return log_error_errno(r, "Failed to add trivial instructions for '%s'", str); r = bpf_program_load_kernel(prog, log_buf, ELEMENTSOF(log_buf)); if (r < 0) return log_error_errno(r, "Failed to load BPF program '%s'", str); if (strv_contains(bpffs_paths, test_suite[i].bpffs_path)) continue; r = strv_extend(&bpffs_paths, test_suite[i].bpffs_path); if (r < 0) return log_error_errno(r, "Failed to put path into a vector: %m"); r = bpf_program_pin(prog->kernel_fd, test_suite[i].bpffs_path); if (r < 0) return log_error_errno(r, "Failed to pin BPF program '%s'", str); } *paths_ret = TAKE_PTR(bpffs_paths); return 0; } static int test_bpf_cgroup_programs(Manager *m, const char *unit_name, const Test *test_suite, size_t test_suite_size) { _cleanup_(unlink_paths_and_freep) char **bpffs_paths = NULL; _cleanup_(unit_freep) Unit *u = NULL; CGroupContext *cc = NULL; int cld_code, r; assert_se(u = unit_new(m, sizeof(Service))); assert_se(unit_add_name(u, unit_name) == 0); assert_se(cc = unit_get_cgroup_context(u)); r = pin_programs(u, cc, test_suite, test_suite_size, &bpffs_paths); if (r < 0) return log_error_errno(r, "Failed to pin programs: %m"); for (size_t i = 0; i < test_suite_size; i++) { if (streq(test_suite[i].option_name, "BPFProgram")) { _cleanup_free_ char *option = NULL; r = bpf_foreign_test_to_string(test_suite[i].attach_type, test_suite[i].bpffs_path, &option); if (r < 0) return log_error_errno(r, "Failed to compose option string: %m"); r = config_parse_bpf_foreign_program( u->id, "filename", 1, "Service", 1, test_suite[i].option_name, 0, option, cc, u); if (r < 0) return log_error_errno(r, "Failed to parse option string '%s': %m", option); } else if (STR_IN_SET(test_suite[i].option_name, "IPIngressFilterPath", "IPEgressFilterPath")) { const char *option = test_suite[i].bpffs_path; void *paths = NULL; if (streq(test_suite[i].option_name, "IPIngressFilterPath")) paths = &cc->ip_filters_ingress; else paths = &cc->ip_filters_egress; r = config_parse_ip_filter_bpf_progs( u->id, "filename", 1, "Service", 1, test_suite[i].option_name, 0, option, paths, u); if (r < 0) return log_error_errno(r, "Failed to parse option string '%s': %m", option); } } r = config_parse_exec( u->id, "filename", 1, "Service", 1, "ExecStart", SERVICE_EXEC_START, "-/bin/ping -c 5 127.0.0.1 -W 1", SERVICE(u)->exec_command, u); if (r < 0) return log_error_errno(r, "Failed to parse ExecStart"); SERVICE(u)->type = SERVICE_ONESHOT; u->load_state = UNIT_LOADED; r = unit_start(u, NULL); if (r < 0) return log_error_errno(r, "Unit start failed %m"); while (!IN_SET(SERVICE(u)->state, SERVICE_DEAD, SERVICE_FAILED)) { r = sd_event_run(m->event, UINT64_MAX); if (r < 0) return log_error_errno(errno, "Event run failed %m"); } cld_code = SERVICE(u)->exec_command[SERVICE_EXEC_START]->exec_status.code; if (cld_code != CLD_EXITED) return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Child didn't exit normally, code='%s'", sigchld_code_to_string(cld_code)); if (SERVICE(u)->state != SERVICE_DEAD) return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Service is not dead"); return r; } int main(int argc, char *argv[]) { _cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL; _cleanup_(manager_freep) Manager *m = NULL; _cleanup_free_ char *unit_dir = NULL; struct rlimit rl; int r; test_setup_logging(LOG_DEBUG); if (detect_container() > 0) return log_tests_skipped("test-bpf fails inside LXC and Docker containers: https://github.com/systemd/systemd/issues/9666"); if (getuid() != 0) return log_tests_skipped("not running as root"); assert_se(getrlimit(RLIMIT_MEMLOCK, &rl) >= 0); rl.rlim_cur = rl.rlim_max = MAX(rl.rlim_max, CAN_MEMLOCK_SIZE); (void) setrlimit_closest(RLIMIT_MEMLOCK, &rl); if (!can_memlock()) return log_tests_skipped("Can't use mlock()"); r = cg_all_unified(); if (r <= 0) return log_tests_skipped("Unified hierarchy is required"); r = enter_cgroup_subroot(NULL); if (r == -ENOMEDIUM) return log_tests_skipped("cgroupfs not available"); assert_se(get_testdata_dir("units", &unit_dir) >= 0); assert_se(set_unit_path(unit_dir) >= 0); assert_se(runtime_dir = setup_fake_runtime_dir()); assert_se(manager_new(LOOKUP_SCOPE_USER, MANAGER_TEST_RUN_BASIC, &m) >= 0); assert_se(manager_startup(m, NULL, NULL, NULL) >= 0); assert_se(test_bpf_cgroup_programs(m, "single_prog.service", single_prog, ELEMENTSOF(single_prog)) >= 0); assert_se(test_bpf_cgroup_programs(m, "multi_prog_same_hook.service", multi_prog_same_hook, ELEMENTSOF(multi_prog_same_hook)) >= 0); assert_se(test_bpf_cgroup_programs(m, "same_prog_multi_hook.service", same_prog_multi_hook, ELEMENTSOF(same_prog_multi_hook)) >= 0); assert_se(test_bpf_cgroup_programs(m, "same_prog_multi_option_0.service", same_prog_multi_option_0, ELEMENTSOF(same_prog_multi_option_0)) >= 0); assert_se(test_bpf_cgroup_programs(m, "same_prog_multi_option_1.service", same_prog_multi_option_1, ELEMENTSOF(same_prog_multi_option_1)) >= 0); assert_se(test_bpf_cgroup_programs(m, "same_prog_same_hook.service", same_prog_same_hook, ELEMENTSOF(same_prog_same_hook)) >= 0); assert_se(test_bpf_cgroup_programs(m, "path_split_test.service", path_split_test, ELEMENTSOF(path_split_test)) >= 0); return 0; }