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Fix haveProgTestRun on kernel version 5.15.65 #788

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merged 1 commit into from Sep 14, 2022
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Fix haveProgTestRun on kernel version 5.15.65 #788

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8 changes: 6 additions & 2 deletions prog.go
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Expand Up @@ -624,8 +624,12 @@ var haveProgTestRun = internal.FeatureTest("BPF_PROG_TEST_RUN", "4.12", func() e
}
defer prog.Close()

// Programs require at least 14 bytes input
in := make([]byte, 14)
// Programs require at least 15 bytes input
// Looking in net/bpf/test_run.c, bpf_test_init() requires that the input is
// at least ETH_HLEN (14) bytes. A recent patch[0] also ensures that the skb
// is not empty after the layer 2 header is removed.
// [0]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fd1894224407c484f652ad456e1ce423e89bb3eb
in := make([]byte, 15)
attr := sys.ProgRunAttr{
ProgFd: uint32(prog.FD()),
DataSizeIn: uint32(len(in)),
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