diff options
Diffstat (limited to 'src/test/test-bpf-foreign-programs.c')
| -rw-r--r-- | src/test/test-bpf-foreign-programs.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/src/test/test-bpf-foreign-programs.c b/src/test/test-bpf-foreign-programs.c new file mode 100644 index 0000000..35c7e0d --- /dev/null +++ b/src/test/test-bpf-foreign-programs.c @@ -0,0 +1,330 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <fcntl.h> +#include <linux/bpf_insn.h> +#include <string.h> +#include <sys/mman.h> +#include <unistd.h> + +#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(RUNTIME_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; +} |