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add redirect to host rules for dns issue in kind
A dns issue showed in kind cluster, due to specific iptables rules added by docker. This commit addresses that by adding a feature allowing to redirect some traffic to host, to get it pass through iptables. This is applied to coredns pods. We use some new user config to specify rulesfor this feature. A tag "host" is added to cnat snat poliy feature and we use it for our vpptap0 to disable snat on traffic outgoing through it.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| // Copyright (C) 2023 Cisco Systems Inc. | ||
| // | ||
| // 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 | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // 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. | ||
|
|
||
| package vpplink | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/projectcalico/vpp-dataplane/v3/vpplink/generated/bindings/classify" | ||
| "github.com/projectcalico/vpp-dataplane/v3/vpplink/generated/bindings/interface_types" | ||
| "github.com/projectcalico/vpp-dataplane/v3/vpplink/types" | ||
| ) | ||
|
|
||
| func (v *VppLink) addDelClassifyTable(table *types.ClassifyTable, action types.ClassifyAction) (uint32, error) { | ||
| client := classify.NewServiceClient(v.GetConnection()) | ||
|
|
||
| isAdd, delChain := false, false | ||
| currentDataFlags := uint8(0) | ||
| tableIndex := types.InvalidTableId | ||
| switch action { | ||
| case types.AddAbsolute: | ||
| isAdd = true | ||
| case types.AddRelative: | ||
| isAdd = true | ||
| currentDataFlags = uint8(1) | ||
| case types.Del: | ||
| tableIndex = table.TableIndex | ||
| case types.DelChain: | ||
| tableIndex = table.TableIndex | ||
| delChain = true | ||
| } | ||
|
|
||
| mask := ExtendToVector(table.Mask) | ||
|
|
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| matchNVectors := table.MatchNVectors | ||
| if matchNVectors == 0 { | ||
| matchNVectors = uint32(len(mask)) / types.VectorSize | ||
| } | ||
|
|
||
| nBuckets := table.NBuckets | ||
| if nBuckets == 0 { | ||
| // We provide as many buckets as the max number of entries we expect in the table | ||
| nBuckets = table.MaxNumEntries | ||
| } | ||
|
|
||
| memorySize := table.MemorySize | ||
| if memorySize == 0 { | ||
| /* memory needed for the table: | ||
| * - each entry has a size of (32-bytes + mask vectors) | ||
| * - up to 2 entries per page for collision resolution | ||
| * - double for margin | ||
| */ | ||
| memorySize = table.MaxNumEntries * (32 + matchNVectors*types.VectorSize) * 2 * 2 | ||
| } | ||
|
|
||
| response, err := client.ClassifyAddDelTable(v.GetContext(), &classify.ClassifyAddDelTable{ | ||
| IsAdd: isAdd, | ||
| DelChain: delChain, | ||
| TableIndex: tableIndex, | ||
| Nbuckets: nBuckets, | ||
| MemorySize: memorySize, | ||
| SkipNVectors: table.SkipNVectors, | ||
| MatchNVectors: matchNVectors, | ||
| NextTableIndex: table.NextTableIndex, | ||
| MissNextIndex: table.MissNextIndex, | ||
| CurrentDataFlag: currentDataFlags, | ||
| CurrentDataOffset: table.CurrentDataOffset, | ||
| MaskLen: uint32(len(mask)), | ||
| Mask: mask, | ||
| }) | ||
|
|
||
| if err != nil { | ||
| return types.InvalidID, fmt.Errorf("Failed to %s the classify table: %w", map[bool]string{true: "add", false: "del"}[isAdd], err) | ||
| } | ||
|
|
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| return response.NewTableIndex, nil | ||
| } | ||
|
|
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| func (v *VppLink) AddClassifyTable(table *types.ClassifyTable) (uint32, error) { | ||
| return v.addDelClassifyTable(table, types.AddRelative) | ||
| } | ||
|
|
||
| func (v *VppLink) DelClassifyTable(tableIndex uint32) error { | ||
| _, err := v.addDelClassifyTable(&types.ClassifyTable{TableIndex: tableIndex}, types.Del) | ||
| return err | ||
| } | ||
|
|
||
| func ExtendToVector(match []byte) []byte { | ||
| n := len(match) % types.VectorSize | ||
| if n != 0 { | ||
| match = match[:len(match)+types.VectorSize-n] | ||
| } | ||
| return match | ||
| } | ||
|
|
||
| func (v *VppLink) SetClassifyInputInterfaceTables(swIfIndex uint32, ip4TableIndex uint32, ip6TableIndex uint32, l2TableIndex uint32, isAdd bool) error { | ||
| client := classify.NewServiceClient(v.GetConnection()) | ||
|
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| _, err := client.InputACLSetInterface(v.GetContext(), &classify.InputACLSetInterface{ | ||
| IsAdd: isAdd, | ||
| SwIfIndex: interface_types.InterfaceIndex(swIfIndex), | ||
| IP4TableIndex: ip4TableIndex, | ||
| IP6TableIndex: ip6TableIndex, | ||
| L2TableIndex: l2TableIndex, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to set input acl tables for this interface: %w", err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (v *VppLink) SetClassifyOutputInterfaceTables(swIfIndex uint32, ip4TableIndex uint32, ip6TableIndex uint32, l2TableIndex uint32, isAdd bool) error { | ||
| client := classify.NewServiceClient(v.GetConnection()) | ||
|
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| _, err := client.OutputACLSetInterface(v.GetContext(), &classify.OutputACLSetInterface{ | ||
| IsAdd: isAdd, | ||
| SwIfIndex: interface_types.InterfaceIndex(swIfIndex), | ||
| IP4TableIndex: ip4TableIndex, | ||
| IP6TableIndex: ip6TableIndex, | ||
| L2TableIndex: l2TableIndex, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to set input acl tables for this interface: %w", err) | ||
| } | ||
| return nil | ||
| } |
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