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BACKPORT: bpf: Added new helper bpf_get_ns_current_pid_tgid

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New bpf helper bpf_get_ns_current_pid_tgid,
This helper will return pid and tgid from current task
which namespace matches dev_t and inode number provided,
this will allows us to instrument a process inside a container.

Change-Id: I77f95343f8252baf6b26b16ccfc0179e9b81f159
Signed-off-by: Carlos Neira <cneirabustos@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200304204157.58695-3-cneirabustos@gmail.com
This commit is contained in:
Carlos Neira 2020-03-04 17:41:56 -03:00 • committed by basamaryan
commit 08bceb2e5a
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17
include/uapi/linux/bpf.h
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@ -2926,6 +2926,19 @@ union bpf_attr {
* of sizeof(struct perf_branch_entry).
*
* **-ENOENT** if architecture does not support branch records.
*
* 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), \
@ -3848,4 +3861,8 @@ struct bpf_sockopt {
__s32 retval;
};
struct bpf_pidns_info {
__u32 pid;
__u32 tgid;
};
#endif /* _UAPI__LINUX_BPF_H__ */