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Miller" , Jakub Kicinski , Jesper Dangaard Brouer , Shaun Crampton , netdev@vger.kernel.org Subject: [PATCH bpf-next v5 3/3] libbpf: add selftests for TC-BPF API Date: Wed, 28 Apr 2021 21:55:53 +0530 Message-Id: <20210428162553.719588-4-memxor@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210428162553.719588-1-memxor@gmail.com> References: <20210428162553.719588-1-memxor@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This adds some basic tests for the low level bpf_tc_* API. Reviewed-by: Toke Høiland-Jørgensen Signed-off-by: Kumar Kartikeya Dwivedi --- .../testing/selftests/bpf/prog_tests/tc_bpf.c | 467 ++++++++++++++++++ .../testing/selftests/bpf/progs/test_tc_bpf.c | 12 + 2 files changed, 479 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/tc_bpf.c create mode 100644 tools/testing/selftests/bpf/progs/test_tc_bpf.c diff --git a/tools/testing/selftests/bpf/prog_tests/tc_bpf.c b/tools/testing/selftests/bpf/prog_tests/tc_bpf.c new file mode 100644 index 000000000000..40441f4e23e2 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/tc_bpf.c @@ -0,0 +1,467 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include + +#include "test_tc_bpf.skel.h" + +#define LO_IFINDEX 1 + +static int test_tc_internal(const struct bpf_tc_hook *hook, int fd) +{ + DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 1, + .prog_fd = fd); + struct bpf_prog_info info = {}; + int ret; + + ret = bpf_obj_get_info_by_fd(fd, &info, &(__u32){sizeof(info)}); + if (!ASSERT_OK(ret, "bpf_obj_get_info_by_fd")) + return ret; + + ret = bpf_tc_attach(hook, &opts, 0); + if (!ASSERT_OK(ret, "bpf_tc_attach")) + return ret; + + if (!ASSERT_EQ(opts.handle, 1, "handle set") || + !ASSERT_EQ(opts.priority, 1, "priority set") || + !ASSERT_EQ(opts.prog_id, info.id, "prog_id set")) + goto end; + + DECLARE_LIBBPF_OPTS(bpf_tc_opts, info_opts, .prog_fd = fd); + ret = bpf_tc_query(hook, &info_opts); + if (!ASSERT_OK(ret, "bpf_tc_query")) + goto end; + + DECLARE_LIBBPF_OPTS(bpf_tc_opts, info_opts2, .prog_id = info.id); + ret = bpf_tc_query(hook, &info_opts2); + if (!ASSERT_OK(ret, "bpf_tc_query")) + goto end; + + if (!ASSERT_EQ(opts.handle, 1, "handle set") || + !ASSERT_EQ(opts.priority, 1, "priority set") || + !ASSERT_EQ(opts.prog_id, info.id, "prog_id set")) + goto end; + + opts.prog_id = 0; + ret = bpf_tc_attach(hook, &opts, BPF_TC_F_REPLACE); + if (!ASSERT_OK(ret, "bpf_tc_attach replace mode")) + return ret; + +end: + opts.prog_fd = opts.prog_id = 0; + ret = bpf_tc_detach(hook, &opts); + ASSERT_OK(ret, "bpf_tc_detach"); + return ret; +} + +static int test_tc_bpf_api(struct bpf_tc_hook *hook, int fd) +{ + DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 1); + DECLARE_LIBBPF_OPTS(bpf_tc_opts, attach_opts, .handle = 1, .priority = 1, + .prog_fd = fd); + DECLARE_LIBBPF_OPTS(bpf_tc_hook, inv_hook, .attach_point = BPF_TC_INGRESS); + int ret; + + ret = bpf_tc_hook_create(NULL, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook = NULL")) + return -EINVAL; + + ret = bpf_tc_hook_create(hook, 42); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid flags")) + return -EINVAL; + ret = bpf_tc_hook_destroy(NULL); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook = NULL")) + return -EINVAL; + + /* hook ifindex = 0 */ + ret = bpf_tc_hook_create(&inv_hook, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook ifindex == 0")) + return -EINVAL; + ret = bpf_tc_hook_destroy(&inv_hook); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook ifindex == 0")) + return -EINVAL; + ret = bpf_tc_attach(&inv_hook, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook ifindex == 0")) + return -EINVAL; + ret = bpf_tc_detach(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook ifindex == 0")) + return -EINVAL; + ret = bpf_tc_query(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook ifindex == 0")) + return -EINVAL; + + /* hook ifindex < 0 */ + inv_hook.ifindex = -1; + ret = bpf_tc_hook_create(&inv_hook, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook ifindex < 0")) + return -EINVAL; + ret = bpf_tc_hook_destroy(&inv_hook); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook ifindex < 0")) + return -EINVAL; + ret = bpf_tc_attach(&inv_hook, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook ifindex < 0")) + return -EINVAL; + ret = bpf_tc_detach(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook ifindex < 0")) + return -EINVAL; + ret = bpf_tc_query(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook ifindex < 0")) + return -EINVAL; + inv_hook.ifindex = LO_IFINDEX; + + /* hook.attach_point invalid */ + inv_hook.attach_point = 0xabcd; + ret = bpf_tc_hook_create(&inv_hook, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook.attach_point")) + return -EINVAL; + ret = bpf_tc_hook_destroy(&inv_hook); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook.attach_point")) + return -EINVAL; + ret = bpf_tc_attach(&inv_hook, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook.attach_point")) + return -EINVAL; + ret = bpf_tc_detach(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook.attach_point")) + return -EINVAL; + ret = bpf_tc_query(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook.attach_point")) + return -EINVAL; + inv_hook.attach_point = BPF_TC_INGRESS; + + /* hook.attach_point valid, but parent invalid */ + inv_hook.parent = TC_H_MAKE(1UL << 16, 10); + ret = bpf_tc_hook_create(&inv_hook, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook parent")) + return -EINVAL; + ret = bpf_tc_hook_destroy(&inv_hook); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook parent")) + return -EINVAL; + ret = bpf_tc_attach(&inv_hook, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook parent")) + return -EINVAL; + ret = bpf_tc_detach(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook parent")) + return -EINVAL; + ret = bpf_tc_query(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook parent")) + return -EINVAL; + + inv_hook.attach_point = BPF_TC_CUSTOM; + inv_hook.parent = 0; + /* These return EOPNOTSUPP instead of EINVAL as parent is checked after + * attach_point of the hook. + */ + ret = bpf_tc_hook_create(&inv_hook, 0); + if (!ASSERT_EQ(ret, -EOPNOTSUPP, "bpf_tc_hook_create invalid hook parent")) + return -EINVAL; + ret = bpf_tc_hook_destroy(&inv_hook); + if (!ASSERT_EQ(ret, -EOPNOTSUPP, "bpf_tc_hook_destroy invalid hook parent")) + return -EINVAL; + ret = bpf_tc_attach(&inv_hook, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook parent")) + return -EINVAL; + ret = bpf_tc_detach(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook parent")) + return -EINVAL; + ret = bpf_tc_query(&inv_hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook parent")) + return -EINVAL; + inv_hook.attach_point = BPF_TC_INGRESS; + + /* detach */ + ret = bpf_tc_detach(NULL, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook = NULL")) + return -EINVAL; + opts.prog_fd = 42; + ret = bpf_tc_detach(hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid prog_fd set")) + return -EINVAL; + opts.prog_fd = 0; + opts.prog_id = 42; + ret = bpf_tc_detach(hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid prog_id set")) + return -EINVAL; + opts.prog_id = 0; + opts.handle = 0; + ret = bpf_tc_detach(hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid handle unset")) + return -EINVAL; + opts.handle = 1; + opts.priority = 0; + ret = bpf_tc_detach(hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid priority unset")) + return -EINVAL; + opts.priority = UINT16_MAX + 1; + ret = bpf_tc_detach(hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid priority > UINT16_MAX")) + return -EINVAL; + opts.priority = 1; + ret = bpf_tc_detach(hook, NULL); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid opts = NULL")) + return -EINVAL; + + /* query */ + ret = bpf_tc_query(NULL, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook = NULL")) + return -EINVAL; + opts.prog_fd = fd; + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid only prog_fd set")) + return -EINVAL; + opts.prog_fd = 0; + opts.prog_id = 42; + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid only prog_id set")) + return -EINVAL; + opts.prog_fd = opts.prog_id = 42; + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid both prog_fd and prog_id set")) + return -EINVAL; + opts.prog_fd = opts.prog_id = 0; + opts.handle = 0; + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid handle unset")) + return -EINVAL; + opts.handle = 1; + opts.priority = 0; + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid priority unset")) + return -EINVAL; + opts.priority = UINT16_MAX + 1; + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid priority > UINT16_MAX")) + return -EINVAL; + opts.priority = 1; + ret = bpf_tc_query(hook, NULL); + if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid opts = NULL")) + return -EINVAL; + + /* attach */ + ret = bpf_tc_attach(NULL, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook = NULL")) + return -EINVAL; + ret = bpf_tc_attach(hook, &attach_opts, 42); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid flags")) + return -EINVAL; + attach_opts.prog_fd = 0; + ret = bpf_tc_attach(hook, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid prog_fd unset")) + return -EINVAL; + attach_opts.prog_fd = fd; + attach_opts.prog_id = 42; + ret = bpf_tc_attach(hook, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid prog_id set")) + return -EINVAL; + attach_opts.prog_id = 0; + attach_opts.handle = 0; + ret = bpf_tc_attach(hook, &attach_opts, 0); + if (!ASSERT_OK(ret, "bpf_tc_attach valid handle unset")) + return -EINVAL; + attach_opts.prog_fd = attach_opts.prog_id = 0; + ASSERT_OK(bpf_tc_detach(hook, &attach_opts), "bpf_tc_detach"); + attach_opts.prog_fd = fd; + attach_opts.handle = 1; + attach_opts.priority = 0; + ret = bpf_tc_attach(hook, &attach_opts, 0); + if (!ASSERT_OK(ret, "bpf_tc_attach valid priority unset")) + return -EINVAL; + attach_opts.prog_fd = attach_opts.prog_id = 0; + ASSERT_OK(bpf_tc_detach(hook, &attach_opts), "bpf_tc_detach"); + attach_opts.prog_fd = fd; + attach_opts.priority = UINT16_MAX + 1; + ret = bpf_tc_attach(hook, &attach_opts, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid priority > UINT16_MAX")) + return -EINVAL; + attach_opts.priority = 0; + attach_opts.handle = attach_opts.priority = 0; + ret = bpf_tc_attach(hook, &attach_opts, 0); + if (!ASSERT_OK(ret, "bpf_tc_attach valid both handle and priority unset")) + return -EINVAL; + attach_opts.prog_fd = attach_opts.prog_id = 0; + ASSERT_OK(bpf_tc_detach(hook, &attach_opts), "bpf_tc_detach"); + ret = bpf_tc_attach(hook, NULL, 0); + if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid opts = NULL")) + return -EINVAL; + + return 0; +} + +static int test_tc_query(const struct bpf_tc_hook *hook, int fd) +{ + struct test_tc_bpf *skel = NULL; + int new_fd, ret, i = 0; + + skel = test_tc_bpf__open_and_load(); + if (!ASSERT_OK_PTR(skel, "test_tc_bpf__open_and_load")) + return -EINVAL; + + new_fd = bpf_program__fd(skel->progs.cls); + + /* make sure no other filters are attached */ + ret = bpf_tc_query(hook, NULL); + if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query == -ENOENT")) + goto end_destroy; + + for (i = 0; i < 5; i++) { + DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .prog_fd = fd); + ret = bpf_tc_attach(hook, &opts, 0); + if (!ASSERT_OK(ret, "bpf_tc_attach")) + goto end; + } + DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 1, + .prog_fd = new_fd); + ret = bpf_tc_attach(hook, &opts, 0); + if (!ASSERT_OK(ret, "bpf_tc_attach")) + goto end; + i++; + + ASSERT_EQ(opts.handle, 1, "handle match"); + ASSERT_EQ(opts.priority, 1, "priority match"); + ASSERT_NEQ(opts.prog_id, 0, "prog_id set"); + + opts.prog_fd = 0; + /* search with handle, priority, prog_id */ + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_OK(ret, "bpf_tc_query")) + goto end; + + ASSERT_EQ(opts.handle, 1, "handle match"); + ASSERT_EQ(opts.priority, 1, "priority match"); + ASSERT_NEQ(opts.prog_id, 0, "prog_id set"); + + opts.priority = opts.prog_fd = 0; + /* search with handle, prog_id */ + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_OK(ret, "bpf_tc_query")) + goto end; + + ASSERT_EQ(opts.handle, 1, "handle match"); + ASSERT_EQ(opts.priority, 1, "priority match"); + ASSERT_NEQ(opts.prog_id, 0, "prog_id set"); + + opts.handle = opts.prog_fd = 0; + /* search with priority, prog_id */ + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_OK(ret, "bpf_tc_query")) + goto end; + + ASSERT_EQ(opts.handle, 1, "handle match"); + ASSERT_EQ(opts.priority, 1, "priority match"); + ASSERT_NEQ(opts.prog_id, 0, "prog_id set"); + + opts.handle = opts.priority = opts.prog_fd = 0; + /* search with prog_id */ + ret = bpf_tc_query(hook, &opts); + if (!ASSERT_OK(ret, "bpf_tc_query")) + goto end; + + ASSERT_EQ(opts.handle, 1, "handle match"); + ASSERT_EQ(opts.priority, 1, "priority match"); + ASSERT_NEQ(opts.prog_id, 0, "prog_id set"); + + while (i != 1) { + DECLARE_LIBBPF_OPTS(bpf_tc_opts, del_opts, .prog_fd = fd); + ret = bpf_tc_query(hook, &del_opts); + if (!ASSERT_OK(ret, "bpf_tc_query")) + goto end; + ASSERT_NEQ(del_opts.prog_id, opts.prog_id, "prog_id should not be same"); + ASSERT_NEQ(del_opts.priority, 1, "priority should not be 1"); + del_opts.prog_fd = del_opts.prog_id = 0; + ret = bpf_tc_detach(hook, &del_opts); + if (!ASSERT_OK(ret, "bpf_tc_detach")) + goto end; + i--; + } + + opts.handle = opts.priority = opts.prog_id = 0; + opts.prog_fd = fd; + ret = bpf_tc_query(hook, &opts); + ASSERT_EQ(ret, -ENOENT, "bpf_tc_query == -ENOENT"); + +end: + while (i--) { + DECLARE_LIBBPF_OPTS(bpf_tc_opts, del_opts, 0); + ret = bpf_tc_query(hook, &del_opts); + if (!ASSERT_OK(ret, "bpf_tc_query")) + break; + del_opts.prog_id = 0; + ret = bpf_tc_detach(hook, &del_opts); + if (!ASSERT_OK(ret, "bpf_tc_detach")) + break; + } + ASSERT_EQ(bpf_tc_query(hook, NULL), -ENOENT, "bpf_tc_query == -ENOENT"); +end_destroy: + test_tc_bpf__destroy(skel); + return ret; +} + +void test_tc_bpf(void) +{ + struct test_tc_bpf *skel = NULL; + bool hook_created = true; + int cls_fd, ret; + + skel = test_tc_bpf__open_and_load(); + if (!ASSERT_OK_PTR(skel, "test_tc_bpf__open_and_load")) + return; + + cls_fd = bpf_program__fd(skel->progs.cls); + + DECLARE_LIBBPF_OPTS(bpf_tc_hook, hook, .ifindex = LO_IFINDEX, + .attach_point = BPF_TC_INGRESS); + ret = bpf_tc_hook_create(&hook, 0); + if (ret < 0 && ret == -EEXIST) { + hook_created = false; + ret = 0; + } + if (!ASSERT_OK(ret, "bpf_tc_hook_create(BPF_TC_INGRESS)")) + goto end; + + hook.attach_point = BPF_TC_CUSTOM; + hook.parent = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS); + ret = bpf_tc_hook_create(&hook, 0); + if (!ASSERT_EQ(ret, -EOPNOTSUPP, "bpf_tc_hook_create invalid hook.attach_point")) + goto end; + + ret = test_tc_internal(&hook, cls_fd); + if (!ASSERT_OK(ret, "test_tc_internal ingress")) + goto end; + + ret = bpf_tc_hook_destroy(&hook); + if (!ASSERT_EQ(ret, -EOPNOTSUPP, "bpf_tc_hook_destroy invalid hook.attach_point")) + goto end; + + hook.attach_point = BPF_TC_INGRESS; + hook.parent = 0; + bpf_tc_hook_destroy(&hook); + + ret = test_tc_internal(&hook, cls_fd); + if (!ASSERT_OK(ret, "test_tc_internal ingress")) + goto end; + + bpf_tc_hook_destroy(&hook); + + hook.attach_point = BPF_TC_EGRESS; + ret = test_tc_internal(&hook, cls_fd); + if (!ASSERT_OK(ret, "test_tc_internal egress")) + goto end; + + bpf_tc_hook_destroy(&hook); + + ret = test_tc_bpf_api(&hook, cls_fd); + if (!ASSERT_OK(ret, "test_tc_bpf_api")) + goto end; + + bpf_tc_hook_destroy(&hook); + + ret = test_tc_query(&hook, cls_fd); + if (!ASSERT_OK(ret, "test_tc_query")) + goto end; + +end: + if (hook_created) { + hook.attach_point = BPF_TC_INGRESS|BPF_TC_EGRESS; + bpf_tc_hook_destroy(&hook); + } + test_tc_bpf__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_tc_bpf.c b/tools/testing/selftests/bpf/progs/test_tc_bpf.c new file mode 100644 index 000000000000..18a3a7ed924a --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_tc_bpf.c @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include + +/* Dummy prog to test TC-BPF API */ + +SEC("classifier") +int cls(struct __sk_buff *skb) +{ + return 0; +} -- 2.30.2