diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c b/tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c new file mode 100644 index 000000000..c7a47b57a --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c @@ -0,0 +1,51 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <test_progs.h> +#include <network_helpers.h> + +void serial_test_flow_dissector_load_bytes(void) +{ + struct bpf_flow_keys flow_keys; + struct bpf_insn prog[] = { + // BPF_REG_1 - 1st argument: context + // BPF_REG_2 - 2nd argument: offset, start at first byte + BPF_MOV64_IMM(BPF_REG_2, 0), + // BPF_REG_3 - 3rd argument: destination, reserve byte on stack + BPF_ALU64_REG(BPF_MOV, BPF_REG_3, BPF_REG_10), + BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -1), + // BPF_REG_4 - 4th argument: copy one byte + BPF_MOV64_IMM(BPF_REG_4, 1), + // bpf_skb_load_bytes(ctx, sizeof(pkt_v4), ptr, 1) + BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, + BPF_FUNC_skb_load_bytes), + BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2), + // if (ret == 0) return BPF_DROP (2) + BPF_MOV64_IMM(BPF_REG_0, BPF_DROP), + BPF_EXIT_INSN(), + // if (ret != 0) return BPF_OK (0) + BPF_MOV64_IMM(BPF_REG_0, BPF_OK), + BPF_EXIT_INSN(), + }; + int fd, err; + LIBBPF_OPTS(bpf_test_run_opts, topts, + .data_in = &pkt_v4, + .data_size_in = sizeof(pkt_v4), + .data_out = &flow_keys, + .data_size_out = sizeof(flow_keys), + .repeat = 1, + ); + + /* make sure bpf_skb_load_bytes is not allowed from skb-less context + */ + fd = bpf_test_load_program(BPF_PROG_TYPE_FLOW_DISSECTOR, prog, + ARRAY_SIZE(prog), "GPL", 0, NULL, 0); + ASSERT_GE(fd, 0, "bpf_test_load_program good fd"); + + err = bpf_prog_test_run_opts(fd, &topts); + ASSERT_OK(err, "test_run"); + ASSERT_EQ(topts.data_size_out, sizeof(flow_keys), + "test_run data_size_out"); + ASSERT_EQ(topts.retval, BPF_OK, "test_run retval"); + + if (fd >= -1) + close(fd); +} |