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Podman network #1790
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Podman network #1790
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| Copyright 2020 The Kubernetes Authors. | ||
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| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package podman | ||
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| import ( | ||
| "crypto/sha1" | ||
| "encoding/binary" | ||
| "net" | ||
| "regexp" | ||
| "strings" | ||
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| "sigs.k8s.io/kind/pkg/errors" | ||
| "sigs.k8s.io/kind/pkg/exec" | ||
| ) | ||
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| // This may be overridden by KIND_EXPERIMENTAL_PODMAN_NETWORK env, | ||
| // experimentally... | ||
| // | ||
| // By default currently picking a single network is equivalent to the previous | ||
| // behavior *except* that we moved from the default bridge to a user defined | ||
| // network because the default bridge is actually special versus any other | ||
| // docker network and lacks the emebdded DNS | ||
| // | ||
| // For now this also makes it easier for apps to join the same network, and | ||
| // leaves users with complex networking desires to create and manage their own | ||
| // networks. | ||
| const fixedNetworkName = "kind" | ||
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| // ensureNetwork creates a new network | ||
| // podman only creates IPv6 networks for versions >= 2.2.0 | ||
| func ensureNetwork(name string) error { | ||
| // network already exists | ||
| if checkIfNetworkExists(name) { | ||
| return nil | ||
| } | ||
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| // generate unique subnet per network based on the name | ||
| // obtained from the ULA fc00::/8 range | ||
| // Make N attempts with "probing" in case we happen to collide | ||
| subnet := generateULASubnetFromName(name, 0) | ||
| err := createNetwork(name, subnet) | ||
| if err == nil { | ||
| // Success! | ||
| return nil | ||
| } | ||
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| if isUnknownIPv6FlagError(err) { | ||
| return createNetwork(name, "") | ||
| } | ||
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| // Only continue if the error is because of the subnet range | ||
| // is already allocated | ||
| if !isPoolOverlapError(err) { | ||
| return err | ||
| } | ||
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| // keep trying for ipv6 subnets | ||
| const maxAttempts = 5 | ||
| for attempt := int32(1); attempt < maxAttempts; attempt++ { | ||
| subnet := generateULASubnetFromName(name, attempt) | ||
| err = createNetwork(name, subnet) | ||
| if err == nil { | ||
| // success! | ||
| return nil | ||
| } else if !isPoolOverlapError(err) { | ||
| // unknown error ... | ||
| return err | ||
| } | ||
| } | ||
| return errors.New("exhausted attempts trying to find a non-overlapping subnet") | ||
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| } | ||
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| func createNetwork(name, ipv6Subnet string) error { | ||
| if ipv6Subnet == "" { | ||
| return exec.Command("podman", "network", "create", "-d=bridge", name).Run() | ||
| } | ||
| return exec.Command("podman", "network", "create", "-d=bridge", | ||
| "--ipv6", "--subnet", ipv6Subnet, name).Run() | ||
| } | ||
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| func checkIfNetworkExists(name string) bool { | ||
| _, err := exec.Output(exec.Command( | ||
| "podman", "network", "inspect", | ||
| regexp.QuoteMeta(name), | ||
| )) | ||
| return err == nil | ||
| } | ||
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| func isUnknownIPv6FlagError(err error) bool { | ||
| rerr := exec.RunErrorForError(err) | ||
| return rerr != nil && | ||
| strings.Contains(string(rerr.Output), "unknown flag: --ipv6") | ||
| } | ||
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| func isPoolOverlapError(err error) bool { | ||
| rerr := exec.RunErrorForError(err) | ||
| return rerr != nil && | ||
| (strings.Contains(string(rerr.Output), "is being used by a network interface") || | ||
| strings.Contains(string(rerr.Output), "is already being used by a cni configuration")) | ||
| } | ||
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| // generateULASubnetFromName generate an IPv6 subnet based on the | ||
| // name and Nth probing attempt | ||
| func generateULASubnetFromName(name string, attempt int32) string { | ||
| ip := make([]byte, 16) | ||
| ip[0] = 0xfc | ||
| ip[1] = 0x00 | ||
| h := sha1.New() | ||
| _, _ = h.Write([]byte(name)) | ||
| _ = binary.Write(h, binary.LittleEndian, attempt) | ||
| bs := h.Sum(nil) | ||
| for i := 2; i < 8; i++ { | ||
| ip[i] = bs[i] | ||
| } | ||
| subnet := &net.IPNet{ | ||
| IP: net.IP(ip), | ||
| Mask: net.CIDRMask(64, 128), | ||
| } | ||
| return subnet.String() | ||
| } |
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TODO: we can insert the name of the one we're using here, there's a .String() on provider
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(we want to avoid useless detail / sending people looking at the wrong thing)
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#1960