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Experimental: Advertise container network with BGP in ipvlan l3
Signed-off-by: YujiOshima <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| package ipvlan | ||
|
|
||
| import ( | ||
| "fmt" | ||
| log "github.com/Sirupsen/logrus" | ||
| "github.com/vishvananda/netlink" | ||
| "net" | ||
| ) | ||
|
|
||
| // Cleanup links with netlink syscalls with a scope of: | ||
| // RT_SCOPE_LINK = 0xfd (253) | ||
| // RT_SCOPE_UNIVERSE = 0x0 (0) | ||
| func cleanExistingRoutes(ifaceStr string) error { | ||
| iface, err := netlink.LinkByName(ifaceStr) | ||
| ipvlanParentIface, err := netlink.LinkByName(ifaceStr) | ||
| if err != nil { | ||
| log.Errorf("Error occoured finding the linux link [ %s ] from netlink: %s", ipvlanParentIface.Attrs().Name, err) | ||
| return err | ||
| } | ||
| routes, err := netlink.RouteList(iface, netlink.FAMILY_V4) | ||
| if err != nil { | ||
| log.Errorf("Unable to retreive netlink routes: %s", err) | ||
| return err | ||
| } | ||
| ifaceIP, err := getIfaceIP(ifaceStr) | ||
| if err != nil { | ||
| log.Errorf("Unable to retreive a usable IP via ethernet interface: %s", ifaceStr) | ||
| return err | ||
| } | ||
| for _, route := range routes { | ||
| if route.Dst == nil { | ||
| log.Debugf("Ignoring route [ %v ] Dst is nil", route) | ||
| continue | ||
| } | ||
| if netOverlaps(ifaceIP, route.Dst) == true { | ||
| log.Debugf("Ignoring route [ %v ] as it is associated to the [ %s ] interface", ifaceIP, ifaceStr) | ||
| } else if route.Scope == 0x0 || route.Scope == 0xfd { | ||
| // Remove link and universal routes from the docker host ipvlan interface | ||
| log.Debugf("Cleaning static route cache for the destination: [ %s ]", route.Dst) | ||
| err := delRoute(route, ipvlanParentIface) | ||
| if err != nil { | ||
| log.Errorf("Error deleting static route cache for Destination: [ %s ] and Nexthop [ %s ] Error: %s", route.Dst, route.Gw, err) | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func verifyRoute(bgpRoute *net.IPNet) { | ||
| networks, err := netlink.RouteList(nil, netlink.FAMILY_V4) | ||
| if err != nil { | ||
| return | ||
| } | ||
| for _, network := range networks { | ||
| if network.Dst != nil && netOverlaps(bgpRoute, network.Dst) { | ||
| log.Errorf("The network [ %v ] learned via BGP conflicts with an existing route on this host [ %v ]", bgpRoute, network.Dst) | ||
| return | ||
| } | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func netOverlaps(netX *net.IPNet, netY *net.IPNet) bool { | ||
| if firstIP, _ := networkRange(netX); netY.Contains(firstIP) { | ||
| return true | ||
| } | ||
| if firstIP, _ := networkRange(netY); netX.Contains(firstIP) { | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| func networkRange(network *net.IPNet) (net.IP, net.IP) { | ||
| var ( | ||
| netIP = network.IP.To4() | ||
| firstIP = netIP.Mask(network.Mask) | ||
| lastIP = net.IPv4(0, 0, 0, 0).To4() | ||
| ) | ||
|
|
||
| for i := 0; i < len(lastIP); i++ { | ||
| lastIP[i] = netIP[i] | ^network.Mask[i] | ||
| } | ||
| return firstIP, lastIP | ||
| } | ||
|
|
||
| func getIfaceIP(name string) (*net.IPNet, error) { | ||
| iface, err := netlink.LinkByName(name) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| addrs, err := netlink.AddrList(iface, netlink.FAMILY_V4) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if len(addrs) == 0 { | ||
| return nil, fmt.Errorf("Interface %v has no IP addresses", name) | ||
| } | ||
| if len(addrs) > 1 { | ||
| log.Debugf("Interface %v has more than 1 IPv4 address. Default is %v\n", name, addrs[0].IP) | ||
| } | ||
| return addrs[0].IPNet, nil | ||
| } | ||
|
|
||
| // delRoute deletes any netlink route | ||
| func delRoute(route netlink.Route, iface netlink.Link) error { | ||
| return netlink.RouteDel(&netlink.Route{ | ||
| Scope: route.Scope, | ||
| LinkIndex: iface.Attrs().Index, | ||
| Dst: route.Dst, | ||
| Gw: route.Gw, | ||
| }) | ||
| } | ||
|
|
||
| // delRemoteRoute deletes a host-scoped route to a device. | ||
| func delRemoteRoute(neighborNetwork *net.IPNet, nextHop net.IP, iface netlink.Link) error { | ||
| return netlink.RouteDel(&netlink.Route{ | ||
| Scope: netlink.SCOPE_UNIVERSE, | ||
| LinkIndex: iface.Attrs().Index, | ||
| Dst: neighborNetwork, | ||
| Gw: nextHop, | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| package ipvlan | ||
|
|
||
| import ( | ||
| "net" | ||
| ) | ||
|
|
||
| type ribCache struct { | ||
| BgpTable map[string]*ribLocal | ||
| } | ||
|
|
||
| // Unmarshalled BGP update binding for simplicity | ||
| type ribLocal struct { | ||
| BgpPrefix *net.IPNet | ||
| OriginatorIP net.IP | ||
| NextHop net.IP | ||
| Age int | ||
| Best bool | ||
| IsWithdraw bool | ||
| IsHostRoute bool | ||
| IsLocal bool | ||
| AsPath string | ||
| RT string | ||
| } | ||
|
|
||
| type ribTest struct { | ||
| BgpTable map[string]*ribLocal | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package ipvlan | ||
|
|
||
| var routemanager routingInterface | ||
|
|
||
| type host struct { | ||
| isself bool | ||
| Address string | ||
| } | ||
|
|
||
| type routingInterface interface { | ||
| CreateVrfNetwork(ParentIface string, vrfID string) error | ||
| AdvertiseNewRoute(localPrefix string, vrfID string) error | ||
| WithdrawRoute(localPrefix string, vrfID string) error | ||
| DiscoverNew(isself bool, Address string) error | ||
| DiscoverDelete(isself bool, Address string) error | ||
| } | ||
|
|
||
| // InitRouteMonitering initialize and start maniternig routing table of host | ||
| func InitRouteMonitering(as string, ras string) { | ||
| routemanager = NewBgpRouteManager(as, ras) | ||
| } |
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