bd6fecb9a9
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 <zhuyifei@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/bpf/9028ccbea4385a620e69c0a104f469ffd655c01e.1591812755.git.zhuyifei@google.com
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2020 Google LLC.
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*/
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#include <test_progs.h>
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#include <network_helpers.h>
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void test_load_bytes_relative(void)
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{
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int server_fd, cgroup_fd, prog_fd, map_fd, client_fd;
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int err;
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struct bpf_object *obj;
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struct bpf_program *prog;
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struct bpf_map *test_result;
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__u32 duration = 0;
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__u32 map_key = 0;
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__u32 map_value = 0;
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cgroup_fd = test__join_cgroup("/load_bytes_relative");
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if (CHECK_FAIL(cgroup_fd < 0))
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return;
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server_fd = start_server(AF_INET, SOCK_STREAM);
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if (CHECK_FAIL(server_fd < 0))
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goto close_cgroup_fd;
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err = bpf_prog_load("./load_bytes_relative.o", BPF_PROG_TYPE_CGROUP_SKB,
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&obj, &prog_fd);
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if (CHECK_FAIL(err))
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goto close_server_fd;
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test_result = bpf_object__find_map_by_name(obj, "test_result");
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if (CHECK_FAIL(!test_result))
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goto close_bpf_object;
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map_fd = bpf_map__fd(test_result);
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if (map_fd < 0)
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goto close_bpf_object;
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prog = bpf_object__find_program_by_name(obj, "load_bytes_relative");
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if (CHECK_FAIL(!prog))
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goto close_bpf_object;
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err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS,
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BPF_F_ALLOW_MULTI);
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if (CHECK_FAIL(err))
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goto close_bpf_object;
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client_fd = connect_to_fd(AF_INET, SOCK_STREAM, server_fd);
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if (CHECK_FAIL(client_fd < 0))
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goto close_bpf_object;
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close(client_fd);
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err = bpf_map_lookup_elem(map_fd, &map_key, &map_value);
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if (CHECK_FAIL(err))
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goto close_bpf_object;
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CHECK(map_value != 1, "bpf", "bpf program returned failure");
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close_bpf_object:
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bpf_object__close(obj);
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close_server_fd:
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close(server_fd);
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close_cgroup_fd:
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close(cgroup_fd);
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}
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