netlink

Documentation

Overview

Package netlink provides router implementation that uses netlink.

Index

• type Retriever
  • func (Retriever) Retrieve(prefix netip.Prefix, ignoreTable uint) (netip.Addr, net.Interface, error)
• type Router
  • func (r *Router) Add(route routes.Route) error
  • func (r *Router) Flush() error

Types

type Retriever

type Retriever struct{}

Retriever is a routes.GatewayRetriever implementation that is using netlink

func (Retriever) Retrieve

func (Retriever) Retrieve(prefix netip.Prefix, ignoreTable uint) (netip.Addr, net.Interface, error)

Retrieve a gateway to a given address while ignoring the given routing table. The mechanism for determining a gateway:

1. All routes are queried in the system;
2. Routes are filtered so they contain only those routes which contain the subnet;
3. Filtered routes are sorted in priority order as it would be on route selection for a packet;
4. All rules are listed and ordered by priority by default;
5. Routes are re-ordered by the ip rule that applies to the route. Routes for which same route can be applied, maintain the same order as defined in 3;
6. First route in the list is chosen as the best match and used to determine a gateway.

type Router

type Router struct {
	sync.Mutex
	// contains filtered or unexported fields
}

Router uses netlink under the hood.

func (*Router) Add

func (r *Router) Add(route routes.Route) error

Add appends route to a routes list via netlink if it does not exist yet.

func (*Router) Flush

func (r *Router) Flush() error

Flush deletes all previously added routes via netlink.