Add testcases for BPF_TRACE_SESSION. The function arguments and return value are tested both in the entry and exit. And the kfunc bpf_tracing_is_exit() is also tested.
As the layout of the stack changed for fsession, so we also test bpf_get_func_ip() for it. Session cookie for fsession is also tested. Multiple fsession BPF progs is attached to bpf_fentry_test1() and session cookie is read and write in the testcase. Signed-off-by: Menglong Dong <[email protected]> --- v3: - restructure the testcase by combine the testcases for session cookie and get_func_ip into one patch --- .../selftests/bpf/prog_tests/fsession_test.c | 95 ++++++++ .../selftests/bpf/progs/fsession_test.c | 230 ++++++++++++++++++ 2 files changed, 325 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/fsession_test.c create mode 100644 tools/testing/selftests/bpf/progs/fsession_test.c diff --git a/tools/testing/selftests/bpf/prog_tests/fsession_test.c b/tools/testing/selftests/bpf/prog_tests/fsession_test.c new file mode 100644 index 000000000000..d70bdb683691 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/fsession_test.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 ChinaTelecom */ +#include <test_progs.h> +#include "fsession_test.skel.h" + +static int check_result(struct fsession_test *skel) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + int err, prog_fd; + + /* Trigger test function calls */ + prog_fd = bpf_program__fd(skel->progs.test1); + err = bpf_prog_test_run_opts(prog_fd, &topts); + if (!ASSERT_OK(err, "test_run_opts err")) + return err; + if (!ASSERT_OK(topts.retval, "test_run_opts retval")) + return topts.retval; + + for (int i = 0; i < sizeof(*skel->bss) / sizeof(__u64); i++) { + if (!ASSERT_EQ(((__u64 *)skel->bss)[i], 1, "test_result")) + return -EINVAL; + } + + /* some fields go to the "data" sections, not "bss" */ + for (int i = 0; i < sizeof(*skel->data) / sizeof(__u64); i++) { + if (!ASSERT_EQ(((__u64 *)skel->data)[i], 1, "test_result")) + return -EINVAL; + } + return 0; +} + +static void test_fsession_basic(void) +{ + struct fsession_test *skel = NULL; + int err; + + skel = fsession_test__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fsession_test__open_and_load")) + goto cleanup; + + err = fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_attach")) + goto cleanup; + + check_result(skel); +cleanup: + fsession_test__destroy(skel); +} + +static void test_fsession_reattach(void) +{ + struct fsession_test *skel = NULL; + int err; + + skel = fsession_test__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fsession_test__open_and_load")) + goto cleanup; + + /* First attach */ + err = fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_first_attach")) + goto cleanup; + + if (check_result(skel)) + goto cleanup; + + /* Detach */ + fsession_test__detach(skel); + + /* Reset counters */ + memset(skel->bss, 0, sizeof(*skel->bss)); + + /* Second attach */ + err = fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_second_attach")) + goto cleanup; + + if (check_result(skel)) + goto cleanup; + +cleanup: + fsession_test__destroy(skel); +} + +void test_fsession_test(void) +{ +#if !defined(__x86_64__) + test__skip(); + return; +#endif + if (test__start_subtest("fsession_basic")) + test_fsession_basic(); + if (test__start_subtest("fsession_reattach")) + test_fsession_reattach(); +} diff --git a/tools/testing/selftests/bpf/progs/fsession_test.c b/tools/testing/selftests/bpf/progs/fsession_test.c new file mode 100644 index 000000000000..8f266d8e4b55 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/fsession_test.c @@ -0,0 +1,230 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 ChinaTelecom */ +#include <vmlinux.h> +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +char _license[] SEC("license") = "GPL"; + +__u64 test1_entry_result = 0; +__u64 test1_exit_result = 0; + +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test1, int a, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test1_entry_result = a == 1 && ret == 0; + /* Return 0 to allow exit to be called */ + return 0; + } + + /* This is exit */ + test1_exit_result = a == 1 && ret == 2; + return 0; +} + +__u64 test2_entry_result = 0; +__u64 test2_exit_result = 1; + +SEC("fsession/bpf_fentry_test2") +int BPF_PROG(test2, int a, __u64 b, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test2_entry_result = a == 2 && b == 3 && ret == 0; + /* Return non-zero value to block exit call */ + return 1; + } + + /* This is exit - should not be called due to blocking */ + test2_exit_result = 0; + return 0; +} + +__u64 test3_entry_result = 0; +__u64 test3_exit_result = 0; + +SEC("fsession/bpf_fentry_test3") +int BPF_PROG(test3, char a, int b, __u64 c, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + test3_entry_result = a == 4 && b == 5 && c == 6 && ret == 0; + return 0; + } + + test3_exit_result = a == 4 && b == 5 && c == 6 && ret == 15; + return 0; +} + +__u64 test4_entry_result = 0; +__u64 test4_exit_result = 0; + +SEC("fsession/bpf_fentry_test4") +int BPF_PROG(test4, void *a, char b, int c, __u64 d, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + test4_entry_result = a == (void *)7 && b == 8 && c == 9 && d == 10 && ret == 0; + return 0; + } + + test4_exit_result = a == (void *)7 && b == 8 && c == 9 && d == 10 && ret == 34; + return 0; +} + +__u64 test5_entry_result = 0; +__u64 test5_exit_result = 0; + +SEC("fsession/bpf_fentry_test5") +int BPF_PROG(test5, __u64 a, void *b, short c, int d, __u64 e, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + test5_entry_result = a == 11 && b == (void *)12 && c == 13 && d == 14 && + e == 15 && ret == 0; + return 0; + } + + test5_exit_result = a == 11 && b == (void *)12 && c == 13 && d == 14 && + e == 15 && ret == 65; + return 0; +} + +__u64 test6_entry_result = 0; +__u64 test6_exit_result = 1; + +SEC("fsession/bpf_fentry_test6") +int BPF_PROG(test6, __u64 a, void *b, short c, int d, void *e, __u64 f, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + test6_entry_result = a == 16 && b == (void *)17 && c == 18 && d == 19 && + e == (void *)20 && f == 21 && ret == 0; + return 1; + } + + test6_exit_result = 0; + return 0; +} + +__u64 test7_entry_result = 0; +__u64 test7_exit_result = 0; + +SEC("fsession/bpf_fentry_test7") +int BPF_PROG(test7, struct bpf_fentry_test_t *arg, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + if (!arg) + test7_entry_result = ret == 0; + return 0; + } + + if (!arg) + test7_exit_result = 1; + return 0; +} + +__u64 test8_entry_result = 0; +__u64 test8_exit_result = 1; +/* + * test1, test8 and test9 hook the same target to verify the "ret" is always + * 0 in the entry. + */ +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test8, int a, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + test8_entry_result = a == 1 && ret == 0; + return -21; + } + + /* This is exit */ + test8_exit_result = 0; + return 0; +} + +__u64 test9_entry_result = 0; +__u64 test9_exit_result = 1; + +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test9, int a, int ret) +{ + bool is_exit = bpf_tracing_is_exit(ctx); + + if (!is_exit) { + test9_entry_result = a == 1 && ret == 0; + return -22; + } + + test9_exit_result = 0; + return 0; +} + +__u64 test10_entry_result = 0; +__u64 test10_exit_result = 0; +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test10, int a) +{ + __u64 addr = bpf_get_func_ip(ctx); + + if (bpf_tracing_is_exit(ctx)) + test10_exit_result = (const void *) addr == &bpf_fentry_test1; + else + test10_entry_result = (const void *) addr == &bpf_fentry_test1; + return 0; +} + +__u64 test11_entry_ok = 0; +__u64 test11_exit_ok = 0; +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test11, int a) +{ + __u64 *cookie = bpf_fsession_cookie(ctx); + + if (!bpf_tracing_is_exit(ctx)) { + if (cookie) { + *cookie = 0xAAAABBBBCCCCDDDDull; + test11_entry_ok = *cookie == 0xAAAABBBBCCCCDDDDull; + } + return 0; + } + + if (cookie) + test11_exit_ok = *cookie == 0xAAAABBBBCCCCDDDDull; + return 0; +} + +__u64 test12_entry_ok = 0; +__u64 test12_exit_ok = 0; + +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test12, int a) +{ + __u64 *cookie = bpf_fsession_cookie(ctx); + + if (!bpf_tracing_is_exit(ctx)) { + if (cookie) { + *cookie = 0x1111222233334444ull; + test12_entry_ok = *cookie == 0x1111222233334444ull; + } + return 0; + } + + if (cookie) + test12_exit_ok = *cookie == 0x1111222233334444ull; + return 0; +} -- 2.51.1
