Here are the classes, structs, unions and interfaces with brief descriptions:

Caddr_info
Cc	Deallocate
Cget_addr_user_callback	Convenience struct for passing addr to user callback
Cget_limits_user_callback	Convenience struct for passing limits to user callback
Ckey_in	Bundle IPv4 address and port as a hash key
Ckey_in6	Bundle IPv6 address and port as a hash key
Clm_value	Mptcpd listener map entry value
Cmptcpd_addr_info	Information associated with a network address
Cmptcpd_config	Mptcpd configuration parameters
Cmptcpd_hash_sockaddr_key	Hash key information
Cmptcpd_idm	Internal mptcpd address ID manager data
Cmptcpd_interface	Network interface-specific information
Cmptcpd_interface_callback_data	Callback information supplied by the user
Cmptcpd_kpm_cmd_ops	Kernel-side MPTCP path management netlink commands
Cmptcpd_limit	MPTCP resource type/limit pair
Cmptcpd_lm	Internal mptcpd listern manager data
Cmptcpd_netlink_pm
Cmptcpd_nm	Data needed to run the network monitor
Cmptcpd_nm_ops	Network monitor event tracking operations
Cmptcpd_plugin_desc	Plugin-specific characteristics / descriptor
Cmptcpd_plugin_ops	Mptcpd plugin interface
Cmptcpd_pm	Data needed to run the path manager
Cmptcpd_pm_cmd_ops	MPTCP path management generic netlink command functions
Cmptcpd_pm_ops	Path manager event tracking operations
Cmptcpd_rtm_addr	Encapsulate network address information
Cnm_addr_info	Convenience structure to bundle address information
Cnm_ops_info	Network monitoring event tracking callback information
Cplugin_address_info	Convenience structure to bundle address information
Cplugin_info	Plugin information
Cplugin_interface_info	Convenience structure to bundle interface information
Cpm_event_attrs	MPTCP generic netlink attribute values
Cpm_ops_info	Path manager event tracking callback information
Cremove_info
Csspi_interface_info	Network interface information
Csspi_new_connection_info	Package `new_connection()` plugin operation arguments
Csspi_nm_callback_data	Type used to return index associated with local address
Ctok_entry