Constants

Auditing.

Kernel connector. See Documentation/connector/* in the Linux kernel source tree for further information.

Netlink interface to request information about ciphers registered with the kernel crypto API as well as allow configuration of the kernel crypto API.

DECnet routing messages.

Access to FIB lookup from user space.

Transport IPv4 packets from netfilter to user space. Used by ip_queue kernel module. After a long period of being declared obsolete (in favor of the more advanced nfnetlink_queue feature), it was removed in Linux 3.5.

Generic netlink family for simplified netlink usage.

Transport IPv6 packets from netfilter to user space. Used by ip6_queue kernel module.

Open-iSCSI.

Kernel messages to user space.

Netfilter subsystem.

Netfilter/iptables ULOG.

Infiniband RDMA.

Receives routing and link updates and may be used to modify the routing tables (both IPv4 and IPv6), IP addresses, link parameters, neighbor setups, queueing disciplines, traffic classes and packet classifiers (see rtnetlink(7)).

SCSI transpots

SELinux event notifications.

Query information about sockets of various protocol families from the kernel (see sock_diag(7)).

Reserved for user-mode socket protocols.