From: Feng Zhou zhoufeng.zf@bytedance.com
This patch adds a test for cgroup skb to get classid.
Signed-off-by: Feng Zhou zhoufeng.zf@bytedance.com --- .../bpf/prog_tests/cg_skb_get_classid.c | 87 +++++++++++++++++++ .../selftests/bpf/progs/cg_skb_get_classid.c | 19 ++++ 2 files changed, 106 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/cg_skb_get_classid.c create mode 100644 tools/testing/selftests/bpf/progs/cg_skb_get_classid.c
diff --git a/tools/testing/selftests/bpf/prog_tests/cg_skb_get_classid.c b/tools/testing/selftests/bpf/prog_tests/cg_skb_get_classid.c new file mode 100644 index 000000000000..13a5943c387d --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/cg_skb_get_classid.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* + * Copyright 2024 Bytedance. + */ + +#include <test_progs.h> + +#include "cg_skb_get_classid.skel.h" + +#include "cgroup_helpers.h" +#include "network_helpers.h" + +static int run_test(int cgroup_fd, int server_fd) +{ + struct cg_skb_get_classid *skel; + int fd, err = 0; + + skel = cg_skb_get_classid__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return -1; + + skel->links.cg_skb_classid = + bpf_program__attach_cgroup(skel->progs.cg_skb_classid, + cgroup_fd); + if (!ASSERT_OK_PTR(skel->links.cg_skb_classid, "prog_attach")) { + err = -1; + goto out; + } + + if (!ASSERT_OK(join_classid(), "join_classid")) { + err = -1; + goto out; + } + + errno = 0; + fd = connect_to_fd_opts(server_fd, NULL); + if (fd >= 0) { + if (skel->bss->classid != getpid()) { + log_err("Get unexpected classid"); + err = -1; + } + + close(fd); + } else { + log_err("Unexpected errno from connect to server"); + err = -1; + } +out: + cg_skb_get_classid__destroy(skel); + return err; +} + +void test_cg_skb_get_classid(void) +{ + struct network_helper_opts opts = {}; + int server_fd, client_fd, cgroup_fd; + static const int port = 60120; + + /* Step 1: Check base connectivity works without any BPF. */ + server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0); + if (!ASSERT_GE(server_fd, 0, "server_fd")) + return; + client_fd = connect_to_fd_opts(server_fd, &opts); + if (!ASSERT_GE(client_fd, 0, "client_fd")) { + close(server_fd); + return; + } + close(client_fd); + close(server_fd); + + /* Step 2: Check BPF prog attached to cgroups. */ + cgroup_fd = test__join_cgroup("/cg_skb_get_classid"); + if (!ASSERT_GE(cgroup_fd, 0, "cgroup_fd")) + return; + server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0); + if (!ASSERT_GE(server_fd, 0, "server_fd")) { + close(cgroup_fd); + return; + } + setup_classid_environment(); + set_classid(); + ASSERT_OK(run_test(cgroup_fd, server_fd), "cg_skb_get_classid"); + cleanup_classid_environment(); + close(server_fd); + close(cgroup_fd); +} diff --git a/tools/testing/selftests/bpf/progs/cg_skb_get_classid.c b/tools/testing/selftests/bpf/progs/cg_skb_get_classid.c new file mode 100644 index 000000000000..aef0265d24eb --- /dev/null +++ b/tools/testing/selftests/bpf/progs/cg_skb_get_classid.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* + * Copyright 2024 Bytedance. + */ + +#include <errno.h> +#include <linux/bpf.h> +#include <bpf/bpf_helpers.h> + +__u32 classid = 0; + +SEC("cgroup_skb/egress") +int cg_skb_classid(struct __sk_buff *ctx) +{ + classid = bpf_skb_cgroup_classid(ctx); + + return 1; +}