You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
95 lines
2.6 KiB
95 lines
2.6 KiB
package rings |
|
|
|
import "net/netip" |
|
|
|
// RingZeroPrefix represents the backbone that connects gateways |
|
// of the different Ring 1 networks. |
|
// |
|
// The ring 0 network corresponds to what would be ring 2 for region_id 0. |
|
// 10.0.0.0-10.0.255.255 |
|
func RingZeroPrefix(region RegionID, zone ZoneID) (cidr netip.Prefix, err error) { |
|
switch { |
|
case !region.Valid(): |
|
err = ErrOutOfRange(region, "region") |
|
case !zone.Valid(): |
|
err = ErrOutOfRange(zone, "zone") |
|
default: |
|
addr := unsafeRingZeroAddress(region, zone, 0) |
|
cidr = netip.PrefixFrom(addr, RingZeroBits) |
|
} |
|
|
|
return cidr, err |
|
} |
|
|
|
// RingZeroAddress returns a Ring 0 address for a particular node. |
|
// |
|
// A ring 0 address looks like 10.0.(region_id << 4 + zone_id).(node_id)/20 |
|
func RingZeroAddress(region RegionID, zone ZoneID, node NodeID) (addr netip.Addr, err error) { |
|
switch { |
|
case !region.Valid(): |
|
err = ErrOutOfRange(region, "region") |
|
case !zone.Valid(): |
|
err = ErrOutOfRange(zone, "zone") |
|
case !node.ValidZero(): |
|
err = ErrOutOfRange(node, "node") |
|
default: |
|
addr = unsafeRingZeroAddress(region, zone, node) |
|
} |
|
|
|
return addr, err |
|
} |
|
|
|
// RingOnePrefix represents a (virtual) local network of a zone. |
|
// |
|
// Ring 1 is `10.(region_id).(zone_id << 4).(node_id)/20` network |
|
// grouped under what would be Ring 2 for region_id 0. |
|
// There are 12 bits worth of nodes but nodes under 255 are special |
|
// as they also get a slot on Ring 0. |
|
func RingOnePrefix(region RegionID, zone ZoneID) (cidr netip.Prefix, err error) { |
|
switch { |
|
case !region.Valid(): |
|
err = ErrOutOfRange(region, "region") |
|
case !zone.Valid(): |
|
err = ErrOutOfRange(zone, "zone") |
|
default: |
|
addr := unsafeRingOneAddress(region, zone, 0) |
|
cidr = netip.PrefixFrom(addr, RingOneBits) |
|
} |
|
return cidr, err |
|
} |
|
|
|
// RingOneAddress returns a Ring 1 address for a particular node. |
|
// |
|
// A ring 1 address is `10.(region_id).(zone_id << 4).(node_id)/20` |
|
// but the node_id can take up to 12 bits. |
|
func RingOneAddress(region RegionID, zone ZoneID, node NodeID) (addr netip.Addr, err error) { |
|
switch { |
|
case !region.Valid(): |
|
err = ErrOutOfRange(region, "region") |
|
case !zone.Valid(): |
|
err = ErrOutOfRange(zone, "zone") |
|
case !node.Valid(): |
|
err = ErrOutOfRange(node, "node") |
|
default: |
|
addr = unsafeRingOneAddress(region, zone, node) |
|
} |
|
return addr, err |
|
} |
|
|
|
func unsafeRingZeroAddress(region RegionID, zone ZoneID, node NodeID) netip.Addr { |
|
r := uint(region) |
|
z := uint(zone) |
|
n := uint(node) |
|
|
|
return AddrFrom4(10, 0, r<<4+z, n) |
|
} |
|
func unsafeRingOneAddress(region RegionID, zone ZoneID, node NodeID) netip.Addr { |
|
r := uint(region) |
|
z := uint(zone) |
|
n := uint(node) |
|
|
|
n1 := n >> 8 |
|
n0 := n >> 0 |
|
|
|
return AddrFrom4(10, r, z<<4+n1, n0) |
|
}
|
|
|