IPSEC kernel configuration API PF_KEY will be deprecated

Issue

• From RHEL9.3 when the af_key module is loaded the following dmesg appears:

Warning: Deprecated Driver is detected: PF_KEY will not be maintained in a future major release and may be disabled

"NET: Registered PF_KEY protocol family" message is expected and has always appeared. The af_key is loaded by "modprobe af_key" or whenever a program (such as the one below) requires it.

#include <sys/socket.h>
#include <linux/pfkeyv2.h>
int main(){
  socket(PF_KEY, SOCK_RAW, PF_KEY_V2);
}