When checking audit logs, you might come across applications that
request loading of a net-pf-## module, with ## being an integer.
Having requests for net-pf-10 is a more known cause (enable IPv6) but
what about net-pf-34?
The answer can be found in /usr/src/linux/include/linux/socket.h:
#define AF_ATMPVC 8 /* ATM PVCs */
#define AF_X25 9 /* Reserved for X.25 project */
#define AF_INET6 10 /* IP version 6 */
#define AF_ROSE 11 /* Amateur Radio X.25 PLP */
#define AF_DECnet 12 /* Reserved for DECnet project */
...
#define AF_BLUETOOTH 31 /* Bluetooth sockets */
#define AF_IUCV 32 /* IUCV sockets */
#define AF_RXRPC 33 /* RxRPC sockets */
#define AF_ISDN 34 /* mISDN sockets */
#define AF_PHONET 35 /* Phonet sockets */
#define AF_IEEE802154 36 /* IEEE802154 sockets */
So next time you get such a weird module load request, check socket.h
for more information.