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Merge pull request #407 from glazychev-art/iprule
Add iprule chain element
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249 changes: 249 additions & 0 deletions
249
pkg/kernel/networkservice/connectioncontextkernel/ipcontext/iprule/common.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,249 @@ | ||
| // Copyright (c) 2022 Doc.ai and/or its affiliates. | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| // 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. | ||
|
|
||
| // +build linux | ||
|
|
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| package iprule | ||
|
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| import ( | ||
| "context" | ||
| "time" | ||
|
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| "github.com/pkg/errors" | ||
| "github.com/vishvananda/netlink" | ||
| "go.uber.org/atomic" | ||
|
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| "github.com/networkservicemesh/api/pkg/api/networkservice" | ||
| "github.com/networkservicemesh/api/pkg/api/networkservice/mechanisms/kernel" | ||
|
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| "github.com/networkservicemesh/sdk/pkg/tools/log" | ||
|
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| link "github.com/networkservicemesh/sdk-kernel/pkg/kernel" | ||
| ) | ||
|
|
||
| func create(ctx context.Context, conn *networkservice.Connection, tableIDs *Map, counter *atomic.Int32) error { | ||
| if mechanism := kernel.ToMechanism(conn.GetMechanism()); mechanism != nil && mechanism.GetVLAN() == 0 { | ||
| // Construct the netlink handle for the target namespace for this kernel interface | ||
| netlinkHandle, err := link.GetNetlinkHandle(mechanism.GetNetNSURL()) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| defer netlinkHandle.Close() | ||
|
|
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| l, err := netlinkHandle.LinkByName(mechanism.GetInterfaceName()) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
|
|
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| if err = netlinkHandle.LinkSetUp(l); err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
|
|
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| for _, policy := range conn.Context.IpContext.Policies { | ||
| // Check if we already created required ip table | ||
| key := tableKey{ | ||
| from: policy.From, | ||
| protocol: policy.Proto, | ||
| port: policy.Port, | ||
| } | ||
| tableID, ok := tableIDs.Load(key) | ||
| if !ok { | ||
| counter.Inc() | ||
| tableID = int(counter.Load()) | ||
| } | ||
|
|
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| // If policy doesn't contain any route - add default | ||
| if len(policy.Routes) == 0 { | ||
| policy.Routes = append(policy.Routes, defaultRoute()) | ||
| } | ||
| for _, route := range policy.Routes { | ||
| if err := routeAdd(ctx, netlinkHandle, l, route, tableID); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
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| if !ok { | ||
| // Check and delete old rules if they don't fit | ||
| _ = delOldRules(ctx, netlinkHandle, policy, tableID) | ||
| // Add new rule | ||
| if err := ruleAdd(ctx, netlinkHandle, policy, tableID); err != nil { | ||
| return err | ||
| } | ||
| tableIDs.Store(key, tableID) | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func policyToRule(policy *networkservice.PolicyRoute) (*netlink.Rule, error) { | ||
| rule := netlink.NewRule() | ||
| if policy.From != "" { | ||
| src, err := netlink.ParseIPNet(policy.From) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| rule.Src = src | ||
| } | ||
| rule.IPProto = int(policy.Proto) | ||
| rule.Dport = netlink.NewRulePortRange(uint16(policy.Port), uint16(policy.Port)) | ||
| return rule, nil | ||
| } | ||
|
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| func ruleAdd(ctx context.Context, handle *netlink.Handle, policy *networkservice.PolicyRoute, tableID int) error { | ||
| rule, err := policyToRule(policy) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| rule.Table = tableID | ||
|
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| now := time.Now() | ||
| if err := handle.RuleAdd(rule); err != nil { | ||
| log.FromContext(ctx). | ||
| WithField("From", policy.From). | ||
| WithField("IPProto", policy.Proto). | ||
| WithField("Port", policy.Port). | ||
| WithField("Table", tableID). | ||
| WithField("duration", time.Since(now)). | ||
| WithField("netlink", "RuleAdd").Errorf("error %+v", err) | ||
| return errors.WithStack(err) | ||
| } | ||
| log.FromContext(ctx). | ||
| WithField("From", policy.From). | ||
| WithField("IPProto", policy.Proto). | ||
| WithField("Port", policy.Port). | ||
| WithField("Table", tableID). | ||
| WithField("duration", time.Since(now)). | ||
| WithField("netlink", "RuleAdd").Debug("completed") | ||
| return nil | ||
| } | ||
|
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| func delOldRules(ctx context.Context, handle *netlink.Handle, policy *networkservice.PolicyRoute, tableID int) error { | ||
| rule, err := policyToRule(policy) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| flags := netlink.RT_FILTER_PROTOCOL | ||
| if rule.Src != nil { | ||
| flags |= netlink.RT_FILTER_SRC | ||
| } | ||
| rules, err := handle.RuleListFiltered(netlink.FAMILY_ALL, rule, flags) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| for i := range rules { | ||
| if rules[i].Dport == rule.Dport { | ||
| if rules[i].Table != tableID { | ||
| err = delRule(ctx, handle, policy) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func defaultRoute() *networkservice.Route { | ||
| return &networkservice.Route{ | ||
| Prefix: "0.0.0.0/0", | ||
| } | ||
| } | ||
|
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| func routeAdd(ctx context.Context, handle *netlink.Handle, l netlink.Link, route *networkservice.Route, tableID int) error { | ||
| if route.GetPrefixIPNet() == nil { | ||
| return errors.New("kernelRoute prefix must not be nil") | ||
| } | ||
| dst := route.GetPrefixIPNet() | ||
| dst.IP = dst.IP.Mask(dst.Mask) | ||
| kernelRoute := &netlink.Route{ | ||
| LinkIndex: l.Attrs().Index, | ||
| Scope: netlink.SCOPE_UNIVERSE, | ||
| Dst: dst, | ||
| Table: tableID, | ||
| } | ||
|
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| gw := route.GetNextHopIP() | ||
| if gw != nil { | ||
| kernelRoute.Gw = gw | ||
| kernelRoute.SetFlag(netlink.FLAG_ONLINK) | ||
| } | ||
|
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| now := time.Now() | ||
| if err := handle.RouteReplace(kernelRoute); err != nil { | ||
| log.FromContext(ctx). | ||
| WithField("link.Name", l.Attrs().Name). | ||
| WithField("Dst", kernelRoute.Dst). | ||
| WithField("Gw", kernelRoute.Gw). | ||
| WithField("Scope", kernelRoute.Scope). | ||
| WithField("Flags", kernelRoute.Flags). | ||
| WithField("Table", tableID). | ||
| WithField("duration", time.Since(now)). | ||
| WithField("netlink", "RouteReplace").Errorf("error %+v", err) | ||
| return errors.WithStack(err) | ||
| } | ||
| log.FromContext(ctx). | ||
| WithField("link.Name", l.Attrs().Name). | ||
| WithField("Dst", kernelRoute.Dst). | ||
| WithField("Gw", kernelRoute.Gw). | ||
| WithField("Scope", kernelRoute.Scope). | ||
| WithField("Flags", kernelRoute.Flags). | ||
| WithField("Table", tableID). | ||
| WithField("duration", time.Since(now)). | ||
| WithField("netlink", "RouteReplace").Debug("completed") | ||
| return nil | ||
| } | ||
|
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| func del(ctx context.Context, conn *networkservice.Connection) error { | ||
| if mechanism := kernel.ToMechanism(conn.GetMechanism()); mechanism != nil && mechanism.GetVLAN() == 0 { | ||
| netlinkHandle, err := link.GetNetlinkHandle(mechanism.GetNetNSURL()) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| defer netlinkHandle.Close() | ||
| for _, policy := range conn.Context.IpContext.Policies { | ||
| if err := delRule(ctx, netlinkHandle, policy); err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func delRule(ctx context.Context, handle *netlink.Handle, policy *networkservice.PolicyRoute) error { | ||
| rule, err := policyToRule(policy) | ||
| if err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
|
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| now := time.Now() | ||
| if err := handle.RuleDel(rule); err != nil { | ||
| log.FromContext(ctx). | ||
| WithField("From", policy.From). | ||
| WithField("IPProto", policy.Proto). | ||
| WithField("Port", policy.Port). | ||
| WithField("duration", time.Since(now)). | ||
| WithField("netlink", "RuleDel").Errorf("error %+v", err) | ||
| return errors.WithStack(err) | ||
| } | ||
| log.FromContext(ctx). | ||
| WithField("From", policy.From). | ||
| WithField("IPProto", policy.Proto). | ||
| WithField("Port", policy.Port). | ||
| WithField("duration", time.Since(now)). | ||
| WithField("netlink", "RuleDel").Debug("completed") | ||
| return nil | ||
| } |
18 changes: 18 additions & 0 deletions
18
pkg/kernel/networkservice/connectioncontextkernel/ipcontext/iprule/doc.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| // Copyright (c) 2022 Doc.ai and/or its affiliates. | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| // 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. | ||
|
|
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| // Package iprule provides networkservice chain elements that support setting ip rules | ||
| package iprule |
30 changes: 30 additions & 0 deletions
30
pkg/kernel/networkservice/connectioncontextkernel/ipcontext/iprule/gen.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| // Copyright (c) 2022 Doc.ai and/or its affiliates. | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| // 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. | ||
|
|
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| package iprule | ||
|
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| import "sync" | ||
|
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| //go:generate go-syncmap -output table_map.gen.go -type Map<tableKey,int> | ||
|
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| type tableKey struct { | ||
| from string | ||
| protocol uint32 | ||
| port uint32 | ||
| } | ||
|
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| // Map - sync.Map with key == tableKey and value == uint32 | ||
| type Map sync.Map |
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