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bpf: Add bpf_skc_to_unix_sock() helper

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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
This commit is contained in:
Hengqi Chen 2021-10-21 21:47:51 +08:00 • committed by Alexei Starovoitov
parent 44ce0ac11e
commit 9eeb3aa33a
6 changed files with 42 additions and 0 deletions
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2
scripts/bpf_doc.py
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@ -537,6 +537,7 @@ class PrinterHelpers(Printer):
'struct tcp_timewait_sock',
'struct tcp_request_sock',
'struct udp6_sock',
'struct unix_sock',
'struct task_struct',
'struct __sk_buff',
@ -589,6 +590,7 @@ class PrinterHelpers(Printer):
'struct tcp_timewait_sock',
'struct tcp_request_sock',
'struct udp6_sock',
'struct unix_sock',
'struct task_struct',
'struct path',
'struct btf_ptr',