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RTABLE_ADD(9) Kernel Developer's Manual RTABLE_ADD(9)

rtable_add, rtable_exists, rtable_loindex, rtable_l2, rtable_l2set
routing tables and routing domains interface

#include <net/rtable.h>
rtable_add(unsigned int id);
rtable_exists(unsigned int id);
unsigned int
rtable_loindex(unsigned int id);
unsigned int
rtable_l2(unsigned int id);
rtable_l2set(unsigned int id, unsigned int rdomain);

Routing tables contain layer 2 and 3 forwarding information. Each address family in use will have its own routing table. Routing domains are a way of logically segmenting a router among multiple networks and may contain more than one routing table.
rtable_add(unsigned int id)
Add routing table with ID of id to routing domain 0.
rtable_exists(unsigned int id)
Return 1 if routing table with ID id exists, 0 otherwise.
rtable_loindex(unsigned int id)
Return the default lo(4) interface index for the routing table with ID of id.
rtable_l2(unsigned int id)
Get the routing domain of routing table with ID of id.
rtable_l2set(unsigned int id, unsigned int rdomain)
Place routing table with ID of id under the routing domain with ID of rdomain.

rtable_add(), rtable_exists(), rtable_loindex(), rtable_l2(), and task_l2set() can be called during autoconf, from process context, or from interrupt context.

rtable_add() may fail with:
A routing table with ID of id already exists.
Memory could not be allocated to extend the list of routing domains.

lo(4), route(4), route(8)
November 14, 2016 OpenBSD-current