]> Git Repo - J-linux.git/blob - tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c
Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / tools / testing / selftests / bpf / prog_tests / flow_dissector_load_bytes.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <network_helpers.h>
4
5 void serial_test_flow_dissector_load_bytes(void)
6 {
7         struct bpf_flow_keys flow_keys;
8         struct bpf_insn prog[] = {
9                 // BPF_REG_1 - 1st argument: context
10                 // BPF_REG_2 - 2nd argument: offset, start at first byte
11                 BPF_MOV64_IMM(BPF_REG_2, 0),
12                 // BPF_REG_3 - 3rd argument: destination, reserve byte on stack
13                 BPF_ALU64_REG(BPF_MOV, BPF_REG_3, BPF_REG_10),
14                 BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -1),
15                 // BPF_REG_4 - 4th argument: copy one byte
16                 BPF_MOV64_IMM(BPF_REG_4, 1),
17                 // bpf_skb_load_bytes(ctx, sizeof(pkt_v4), ptr, 1)
18                 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
19                              BPF_FUNC_skb_load_bytes),
20                 BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2),
21                 // if (ret == 0) return BPF_DROP (2)
22                 BPF_MOV64_IMM(BPF_REG_0, BPF_DROP),
23                 BPF_EXIT_INSN(),
24                 // if (ret != 0) return BPF_OK (0)
25                 BPF_MOV64_IMM(BPF_REG_0, BPF_OK),
26                 BPF_EXIT_INSN(),
27         };
28         int fd, err;
29         LIBBPF_OPTS(bpf_test_run_opts, topts,
30                 .data_in = &pkt_v4,
31                 .data_size_in = sizeof(pkt_v4),
32                 .data_out = &flow_keys,
33                 .data_size_out = sizeof(flow_keys),
34                 .repeat = 1,
35         );
36
37         /* make sure bpf_skb_load_bytes is not allowed from skb-less context
38          */
39         fd = bpf_test_load_program(BPF_PROG_TYPE_FLOW_DISSECTOR, prog,
40                               ARRAY_SIZE(prog), "GPL", 0, NULL, 0);
41         ASSERT_GE(fd, 0, "bpf_test_load_program good fd");
42
43         err = bpf_prog_test_run_opts(fd, &topts);
44         ASSERT_OK(err, "test_run");
45         ASSERT_EQ(topts.data_size_out, sizeof(flow_keys),
46                   "test_run data_size_out");
47         ASSERT_EQ(topts.retval, BPF_OK, "test_run retval");
48
49         if (fd >= -1)
50                 close(fd);
51 }
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