Re: [PATCH v15 3/5] tools: Added bpf_get_ns_current_pid_tgid helper

[Yonghong Song <yhs@fb.com>]

On 10/22/19 12:17 PM, Carlos Neira wrote:
> sync tools/include/uapi/linux/bpf.h to include new helper.
> 
> Signed-off-by: Carlos Neira <cneirabustos@gmail.com>

Acked-by: Yonghong Song <yhs@fb.com>

> ---
>   tools/include/uapi/linux/bpf.h | 20 +++++++++++++++++++-
>   1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index 4af8b0819a32..4c3e0b0952e6 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -2775,6 +2775,19 @@ union bpf_attr {
>    * 		restricted to raw_tracepoint bpf programs.
>    * 	Return
>    * 		0 on success, or a negative error in case of failure.
> + *
> + * int bpf_get_ns_current_pid_tgid(u64 dev, u64 ino, struct bpf_pidns_info *nsdata, u32 size)
> + *	Description
> + *		Returns 0 on success, values for *pid* and *tgid* as seen from the current
> + *		*namespace* will be returned in *nsdata*.
> + *
> + *		On failure, the returned value is one of the following:
> + *
> + *		**-EINVAL** if dev and inum supplied don't match dev_t and inode number
> + *              with nsfs of current task, or if dev conversion to dev_t lost high bits.
> + *
> + *		**-ENOENT** if pidns does not exists for the current task.
> + *
>    */
>   #define __BPF_FUNC_MAPPER(FN)		\
>   	FN(unspec),			\
> @@ -2888,7 +2901,8 @@ union bpf_attr {
>   	FN(sk_storage_delete),		\
>   	FN(send_signal),		\
>   	FN(tcp_gen_syncookie),		\
> -	FN(skb_output),
> +	FN(skb_output),			\
> +	FN(get_ns_current_pid_tgid),
>   
>   /* integer value in 'imm' field of BPF_CALL instruction selects which helper
>    * function eBPF program intends to call
> @@ -3639,4 +3653,8 @@ struct bpf_sockopt {
>   	__s32	retval;
>   };
>   
> +struct bpf_pidns_info {
> +	__u32 pid;
> +	__u32 tgid;
> +};
>   #endif /* _UAPI__LINUX_BPF_H__ */
>