func open() *bgp.BGPMessage {
p1 := bgp.NewOptionParameterCapability(
[]bgp.ParameterCapabilityInterface{bgp.NewCapRouteRefresh()})
p2 := bgp.NewOptionParameterCapability(
[]bgp.ParameterCapabilityInterface{bgp.NewCapMultiProtocol(bgp.RF_IPv4_UC)})
g := &bgp.CapGracefulRestartTuple{4, 2, 3}
p3 := bgp.NewOptionParameterCapability(
[]bgp.ParameterCapabilityInterface{bgp.NewCapGracefulRestart(true, 100,
[]*bgp.CapGracefulRestartTuple{g})})
p4 := bgp.NewOptionParameterCapability(
[]bgp.ParameterCapabilityInterface{bgp.NewCapFourOctetASNumber(100000)})
return bgp.NewBGPOpenMessage(11033, 303, "100.4.10.3",
[]bgp.OptionParameterInterface{p1, p2, p3, p4})
}
func capabilitiesFromConfig(pConf *config.Neighbor) []bgp.ParameterCapabilityInterface {
caps := make([]bgp.ParameterCapabilityInterface, 0, 4)
caps = append(caps, bgp.NewCapRouteRefresh())
for _, rf := range pConf.AfiSafis {
family, _ := bgp.GetRouteFamily(string(rf.Config.AfiSafiName))
caps = append(caps, bgp.NewCapMultiProtocol(family))
}
caps = append(caps, bgp.NewCapFourOctetASNumber(pConf.Config.LocalAs))
if c := pConf.GracefulRestart.Config; c.Enabled {
tuples := []*bgp.CapGracefulRestartTuple{}
ltuples := []*bgp.CapLongLivedGracefulRestartTuple{}
// RFC 4724 4.1
// To re-establish the session with its peer, the Restarting Speaker
// MUST set the "Restart State" bit in the Graceful Restart Capability
// of the OPEN message.
restarting := pConf.GracefulRestart.State.LocalRestarting
if !c.HelperOnly {
for i, rf := range pConf.AfiSafis {
k, _ := bgp.GetRouteFamily(string(rf.Config.AfiSafiName))
if m := rf.MpGracefulRestart.Config; m.Enabled {
// When restarting, always flag forwaring bit.
// This can be a lie, depending on how gobgpd is used.
// For a route-server use-case, since a route-server
// itself doesn't forward packets, and the dataplane
// is a l2 switch which continues to work with no
// relation to bgpd, this behavior is ok.
// TODO consideration of other use-cases
tuples = append(tuples, bgp.NewCapGracefulRestartTuple(k, restarting))
pConf.AfiSafis[i].MpGracefulRestart.State.Advertised = true
}
if m := rf.LongLivedGracefulRestart.Config; m.Enabled {
ltuples = append(ltuples, bgp.NewCapLongLivedGracefulRestartTuple(k, restarting, m.RestartTime))
}
}
}
time := c.RestartTime
notification := c.NotificationEnabled
caps = append(caps, bgp.NewCapGracefulRestart(restarting, notification, time, tuples))
if c.LongLivedEnabled {
caps = append(caps, bgp.NewCapLongLivedGracefulRestart(ltuples))
}
}
return caps
}