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package ip
import (
"fmt"
"net"
"github.com/vishvananda/netlink"
"golang.org/x/sys/unix"
)
// NeighbourIPState can be { NeighbourIPStatePermanent | NeighbourIPStateNoARP | NeighbourIPStateReachable | NeighbourIPStateStale | NeighbourIPStateNone | NeighbourIPStateIncomplete | NeighbourIPStateDelay | NeighbourIPStateProbe | NeighbourIPStateFailed }.
type NeighbourIPState int
const (
// NeighbourIPStatePermanent the neighbour entry is valid forever and can be only be removed administratively.
NeighbourIPStatePermanent NeighbourIPState = unix.NUD_PERMANENT
// NeighbourIPStateNoARP the neighbour entry is valid. No attempts to validate this entry will be made but it can
// be removed when its lifetime expires.
NeighbourIPStateNoARP NeighbourIPState = unix.NUD_NOARP
// NeighbourIPStateReachable the neighbour entry is valid until the reachability timeout expires.
NeighbourIPStateReachable NeighbourIPState = unix.NUD_REACHABLE
// NeighbourIPStateStale the neighbour entry is valid but suspicious.
NeighbourIPStateStale NeighbourIPState = unix.NUD_STALE
// NeighbourIPStateNone this is a pseudo state used when initially creating a neighbour entry or after trying to
// remove it before it becomes free to do so.
NeighbourIPStateNone NeighbourIPState = unix.NUD_NONE
// NeighbourIPStateIncomplete the neighbour entry has not (yet) been validated/resolved.
NeighbourIPStateIncomplete NeighbourIPState = unix.NUD_INCOMPLETE
// NeighbourIPStateDelay neighbor entry validation is currently delayed.
NeighbourIPStateDelay NeighbourIPState = unix.NUD_DELAY
// NeighbourIPStateProbe neighbor is being probed.
NeighbourIPStateProbe NeighbourIPState = unix.NUD_PROBE
// NeighbourIPStateFailed max number of probes exceeded without success, neighbor validation has ultimately failed.
NeighbourIPStateFailed NeighbourIPState = unix.NUD_FAILED
)
// Neigh represents arguments for neighbour manipulation.
type Neigh struct {
DevName string
Addr net.IP
MAC net.HardwareAddr
State NeighbourIPState
}
// Show list neighbour entries filtered by DevName and optionally MAC address.
func (n *Neigh) Show() ([]Neigh, error) {
link, err := linkByName(n.DevName)
if err != nil {
return nil, err
}
netlinkNeighbours, err := netlink.NeighList(link.Attrs().Index, netlink.FAMILY_ALL)
if err != nil {
return nil, fmt.Errorf("Failed to get neighbours for link %q: %w", n.DevName, err)
}
neighbours := make([]Neigh, 0, len(netlinkNeighbours))
for _, neighbour := range netlinkNeighbours {
if neighbour.HardwareAddr.String() != n.MAC.String() {
continue
}
neighbours = append(neighbours, Neigh{
Addr: neighbour.IP,
MAC: neighbour.HardwareAddr,
State: NeighbourIPState(neighbour.State),
})
}
return neighbours, nil
}
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