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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.

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 Andrii Nakryiko
parent 2ef4fdac6c
commit 84cf76de9c
1 changed files with 19 additions and 1 deletions
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20
include/uapi/linux/bpf.h
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@@ -2914,6 +2914,19 @@ union bpf_attr {
* of sizeof(struct perf_branch_entry). * of sizeof(struct perf_branch_entry).
* *
* **-ENOENT** if architecture does not support branch records. * **-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) \ #define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \ FN(unspec), \
@@ -3035,7 +3048,8 @@ union bpf_attr {
FN(tcp_send_ack), \ FN(tcp_send_ack), \
FN(send_signal_thread), \ FN(send_signal_thread), \
FN(jiffies64), \ FN(jiffies64), \
FN(read_branch_records), FN(read_branch_records), \
FN(get_ns_current_pid_tgid),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper /* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call * function eBPF program intends to call
@@ -3829,4 +3843,8 @@ struct bpf_sockopt {
__s32 retval; __s32 retval;
}; };
struct bpf_pidns_info {
__u32 pid;
__u32 tgid;
};
#endif /* _UAPI__LINUX_BPF_H__ */ #endif /* _UAPI__LINUX_BPF_H__ */