netdev - [PATCH v13 3/4] tools: Added bpf_get_ns_current_pid

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Message-Id: <20191009152632.14218-4-cneirabustos@gmail.com>
Date:   Wed,  9 Oct 2019 12:26:31 -0300
From:   Carlos Neira <cneirabustos@...il.com>
To:     netdev@...r.kernel.org
Cc:     yhs@...com, ebiederm@...ssion.com, brouer@...hat.com,
        bpf@...r.kernel.org, cneirabustos@...il.com
Subject: [PATCH v13 3/4] tools: Added bpf_get_ns_current_pid_tgid helper

sync tools/include/uapi/linux/bpf.h to include new helper.

Signed-off-by: Carlos Neira <cneirabustos@...il.com>
---
 tools/include/uapi/linux/bpf.h | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 77c6be96d676..6ad3f2abf00d 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2750,6 +2750,19 @@ union bpf_attr {
  *		**-EOPNOTSUPP** kernel configuration does not enable SYN cookies
  *
  *		**-EPROTONOSUPPORT** IP packet version is not 4 or 6
+ *
+ * u64 bpf_get_ns_current_pid_tgid(struct *bpf_pidns_info, u32 size)
+ *	Return
+ *		0 on success, values for pid and tgid from nsinfo will be as seen
+ *		from the namespace that matches dev and inum from nsinfo.
+ *
+ *		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 /proc/self/ns does not exists.
+ *
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -2862,7 +2875,8 @@ union bpf_attr {
 	FN(sk_storage_get),		\
 	FN(sk_storage_delete),		\
 	FN(send_signal),		\
-	FN(tcp_gen_syncookie),
+	FN(tcp_gen_syncookie),          \
+	FN(get_ns_current_pid_tgid),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call
@@ -3613,4 +3627,10 @@ struct bpf_sockopt {
 	__s32	retval;
 };
 
+struct bpf_pidns_info {
+	__u64 dev;
+	__u64 inum;
+	__u32 pid;
+	__u32 tgid;
+};
 #endif /* _UAPI__LINUX_BPF_H__ */
-- 
2.20.1