-
Notifications
You must be signed in to change notification settings - Fork 881
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Experimental: Advertise container network with BGP in ipvlan l3
- Loading branch information
1 parent
3f771e3
commit 4b8de9e
Showing
9 changed files
with
828 additions
and
6 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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, | ||
| }) | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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 | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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) | ||
| } |
Oops, something went wrong.