[FS#1524] Strongswan: failed to find a module named af_key

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Max (masnia) 

Attached to Project - OpenWrt/LEDE Project
Summary - Strongswan: failed to find a module named af_key
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I updated to trunk version r6772 and now with 4.14.36 kernel I can not start strongswan 5.6.2.
Returning to 17.01.4 everything works again.

Router D-Link DIR-860L
code>Sat Apr 28 19:15:32 2018 authpriv.info ipsec_starter[4606]: Starting strongSwan 5.6.2 IPsec [starter]...
Sat Apr 28 19:15:32 2018 daemon.err modprobe: failed to find a module named af_key
Sat Apr 28 19:15:32 2018 authpriv.info ipsec_starter[4606]: no netkey IPsec stack detected
Sat Apr 28 19:15:32 2018 daemon.info modprobe: Usage:     modprobe [-q] filename
Sat Apr 28 19:15:32 2018 authpriv.info ipsec_starter[4606]: no KLIPS IPsec stack detected
Sat Apr 28 19:15:32 2018 authpriv.info ipsec_starter[4606]: no known IPsec stack detected, ignoring!
Sat Apr 28 19:15:32 2018 daemon.info : 00[DMN] Starting IKE charon daemon (strongSwan 5.6.2, Linux 4.14.36, mips)
Sat Apr 28 19:15:32 2018 daemon.info : 00[KNL] unable to create netlink socket: Protocol not supported (120)
Sat Apr 28 19:15:32 2018 daemon.info : 00[NET] installing IKE bypass policy failed

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1524