52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include <network_helpers.h>
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void serial_test_flow_dissector_load_bytes(void)
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{
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struct bpf_flow_keys flow_keys;
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struct bpf_insn prog[] = {
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// BPF_REG_1 - 1st argument: context
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// BPF_REG_2 - 2nd argument: offset, start at first byte
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BPF_MOV64_IMM(BPF_REG_2, 0),
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// BPF_REG_3 - 3rd argument: destination, reserve byte on stack
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BPF_ALU64_REG(BPF_MOV, BPF_REG_3, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -1),
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// BPF_REG_4 - 4th argument: copy one byte
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BPF_MOV64_IMM(BPF_REG_4, 1),
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// bpf_skb_load_bytes(ctx, sizeof(pkt_v4), ptr, 1)
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
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BPF_FUNC_skb_load_bytes),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
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// if (ret == 0) return BPF_DROP (2)
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BPF_MOV64_IMM(BPF_REG_0, BPF_DROP),
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BPF_EXIT_INSN(),
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// if (ret != 0) return BPF_OK (0)
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BPF_MOV64_IMM(BPF_REG_0, BPF_OK),
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BPF_EXIT_INSN(),
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};
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int fd, err;
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LIBBPF_OPTS(bpf_test_run_opts, topts,
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.data_in = &pkt_v4,
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.data_size_in = sizeof(pkt_v4),
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.data_out = &flow_keys,
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.data_size_out = sizeof(flow_keys),
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.repeat = 1,
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);
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/* make sure bpf_skb_load_bytes is not allowed from skb-less context
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*/
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fd = bpf_test_load_program(BPF_PROG_TYPE_FLOW_DISSECTOR, prog,
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ARRAY_SIZE(prog), "GPL", 0, NULL, 0);
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ASSERT_GE(fd, 0, "bpf_test_load_program good fd");
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err = bpf_prog_test_run_opts(fd, &topts);
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ASSERT_OK(err, "test_run");
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ASSERT_EQ(topts.data_size_out, sizeof(flow_keys),
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"test_run data_size_out");
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ASSERT_EQ(topts.retval, 1, "test_run retval");
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if (fd >= -1)
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close(fd);
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}
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