netdev - [PATCH bpf-next v11 3/4] tools: Added bpf_get_ns_current_pid

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Message-Id: <20190924152005.4659-4-cneirabustos@gmail.com>
Date:   Tue, 24 Sep 2019 12:20:04 -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 bpf-next v11 3/4] tools: Added bpf_get_ns_current_pid_tgid helper

Signed-off-by: Carlos Neira <cneirabustos@...il.com>
---
 tools/include/uapi/linux/bpf.h | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 77c6be96d676..9272dc8fb08c 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2750,6 +2750,21 @@ union bpf_attr {
  *		**-EOPNOTSUPP** kernel configuration does not enable SYN cookies
  *
  *		**-EPROTONOSUPPORT** IP packet version is not 4 or 6
+ *
+ * int bpf_get_ns_current_pid_tgid(u32 dev, u64 inum)
+ *	Return
+ *		A 64-bit integer containing the current tgid and pid from current task
+ *              which namespace inode and dev_t matches , and is create as such:
+ *		*current_task*\ **->tgid << 32 \|**
+ *		*current_task*\ **->pid**.
+ *
+ *		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.
+ *
+ *		**-ENOENT** if /proc/self/ns does not exists.
+ *
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -2862,7 +2877,8 @@ 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
-- 
2.20.1