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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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7
tools/include/uapi/linux/bpf.h
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@ -4909,6 +4909,12 @@ union bpf_attr {
* Return
* The number of bytes written to the buffer, or a negative error
* in case of failure.
*
* struct unix_sock *bpf_skc_to_unix_sock(void *sk)
* Description
* Dynamically cast a *sk* pointer to a *unix_sock* pointer.
* Return
* *sk* if casting is valid, or **NULL** otherwise.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@ -5089,6 +5095,7 @@ union bpf_attr {
FN(task_pt_regs), \
FN(get_branch_snapshot), \
FN(trace_vprintk), \
FN(skc_to_unix_sock), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper