etc/iproute2/nl_protos

# Netlink protocol names mapping

0   rtnl
1   unused
2   usersock
3   fw
4   tcpdiag
5   nflog
6   xfrm
7   selinux
8   iscsi
9   audit
10  fiblookup
11  connector
12  nft
13  ip6fw
14  dec-rt
15  uevent
16  genl
18  scsi-trans
19  ecryptfs
20  rdma
21  crypto