From bd6fecb9a99cceb949271c1821cfbad2b2db97c6 Mon Sep 17 00:00:00 2001 From: YiFei Zhu Date: Wed, 10 Jun 2020 13:41:40 -0500 Subject: selftests/bpf: Add cgroup_skb/egress test for load_bytes_relative When cgroup_skb/egress triggers the MAC header is not set. Added a test that asserts reading MAC header is a -EFAULT but NET header succeeds. The test result from within the eBPF program is stored in an 1-element array map that the userspace then reads and asserts on. Another assertion is added that reading from a large offset, past the end of packet, returns -EFAULT. Signed-off-by: YiFei Zhu Signed-off-by: Daniel Borkmann Reviewed-by: Stanislav Fomichev Link: https://lore.kernel.org/bpf/9028ccbea4385a620e69c0a104f469ffd655c01e.1591812755.git.zhuyifei@google.com --- .../selftests/bpf/prog_tests/load_bytes_relative.c | 71 ++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/load_bytes_relative.c (limited to 'tools/testing/selftests/bpf/prog_tests/load_bytes_relative.c') diff --git a/tools/testing/selftests/bpf/prog_tests/load_bytes_relative.c b/tools/testing/selftests/bpf/prog_tests/load_bytes_relative.c new file mode 100644 index 000000000000..c1168e4a9036 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/load_bytes_relative.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* + * Copyright 2020 Google LLC. + */ + +#include +#include + +void test_load_bytes_relative(void) +{ + int server_fd, cgroup_fd, prog_fd, map_fd, client_fd; + int err; + struct bpf_object *obj; + struct bpf_program *prog; + struct bpf_map *test_result; + __u32 duration = 0; + + __u32 map_key = 0; + __u32 map_value = 0; + + cgroup_fd = test__join_cgroup("/load_bytes_relative"); + if (CHECK_FAIL(cgroup_fd < 0)) + return; + + server_fd = start_server(AF_INET, SOCK_STREAM); + if (CHECK_FAIL(server_fd < 0)) + goto close_cgroup_fd; + + err = bpf_prog_load("./load_bytes_relative.o", BPF_PROG_TYPE_CGROUP_SKB, + &obj, &prog_fd); + if (CHECK_FAIL(err)) + goto close_server_fd; + + test_result = bpf_object__find_map_by_name(obj, "test_result"); + if (CHECK_FAIL(!test_result)) + goto close_bpf_object; + + map_fd = bpf_map__fd(test_result); + if (map_fd < 0) + goto close_bpf_object; + + prog = bpf_object__find_program_by_name(obj, "load_bytes_relative"); + if (CHECK_FAIL(!prog)) + goto close_bpf_object; + + err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, + BPF_F_ALLOW_MULTI); + if (CHECK_FAIL(err)) + goto close_bpf_object; + + client_fd = connect_to_fd(AF_INET, SOCK_STREAM, server_fd); + if (CHECK_FAIL(client_fd < 0)) + goto close_bpf_object; + close(client_fd); + + err = bpf_map_lookup_elem(map_fd, &map_key, &map_value); + if (CHECK_FAIL(err)) + goto close_bpf_object; + + CHECK(map_value != 1, "bpf", "bpf program returned failure"); + +close_bpf_object: + bpf_object__close(obj); + +close_server_fd: + close(server_fd); + +close_cgroup_fd: + close(cgroup_fd); +} -- cgit