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bpf: Add bpf_skc_to_unix_sock() helper
The helper is used in tracing programs to cast a socket pointer to a unix_sock pointer. The return value could be NULL if the casting is illegal. Suggested-by: Yonghong Song <yhs@fb.com> Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20211021134752.1223426-2-hengqi.chen@gmail.com
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