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Enhance Submariner to use VxLAN Overlay Tunnels for inter-cluster tra…
…ffic As part of supporting Network policies and for ease of debugging, this patch implements the following. 1. Creates VxLAN tunnels in the local Cluster between the worker nodes and the Cluster Gateway Node. 2. Programms the necessary iptable rules on the Cluster nodes to allow inter-cluster traffic. 3. This patch also avoids SNAT/MASQ for inter-cluster traffic, thereby preserving the original source ip of the POD all the way until the destination POD. 4. Programs the routing rules on the workerNodes to forward the remoteCluster traffic over the VxLAN interface that is created between the worker node and Cluster GatewayNode. This patch depends on the following other patches Depends-On: submariner-io#135 Depends-On: submariner-io/submariner-charts#3 Depends-On: submariner-io/submariner-charts#4
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package route | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/coreos/go-iptables/iptables" | ||
| "k8s.io/klog" | ||
| ) | ||
|
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||
| func (r *Controller) createIPTableChains() error { | ||
| ipt, err := iptables.New() | ||
| if err != nil { | ||
| klog.Errorf("Error while initializing iptables: %v", err) | ||
| return err | ||
| } | ||
|
|
||
| klog.V(4).Infof("Install/ensure %s chain exists", SM_POSTROUTING_CHAIN) | ||
| if err = ipt.NewChain("nat", SM_POSTROUTING_CHAIN); err != nil { | ||
| klog.Errorf("Unable to create %s chain in iptables: %v", SM_POSTROUTING_CHAIN, err) | ||
| } | ||
|
|
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| klog.V(4).Infof("Insert %s rule that has rules for inter-cluster traffic", SM_POSTROUTING_CHAIN) | ||
| forwardToSubPostroutingRuleSpec := []string{"-j", SM_POSTROUTING_CHAIN} | ||
| if err = r.insertUnique(ipt, "nat", "POSTROUTING", 1, forwardToSubPostroutingRuleSpec); err != nil { | ||
| klog.Errorf("Unable to insert iptable rule in NAT table, POSTROUTING chain: %v", err) | ||
| } | ||
|
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||
| klog.V(4).Infof("Install/ensure SUBMARINER-INPUT chain exists") | ||
| if err = ipt.NewChain("filter", "SUBMARINER-INPUT"); err != nil { | ||
| klog.Errorf("Unable to create SUBMARINER-INPUT chain in iptables: %v", err) | ||
| } | ||
|
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| forwardToSubInputRuleSpec := []string{"-p", "udp", "-m", "udp", "-j", "SUBMARINER-INPUT"} | ||
| if err = ipt.AppendUnique("filter", "INPUT", forwardToSubInputRuleSpec...); err != nil { | ||
| klog.Errorf("Unable to append iptables rule \"%s\": %v\n", strings.Join(forwardToSubInputRuleSpec, " "), err) | ||
| } | ||
|
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| klog.V(4).Infof("Allow VxLAN incoming traffic in SUBMARINER-INPUT Chain") | ||
| ruleSpec := []string{"-p", "udp", "-m", "udp", "--dport", VXLAN_PORT, "-j", "ACCEPT"} | ||
| if err = ipt.AppendUnique("filter", "SUBMARINER-INPUT", ruleSpec...); err != nil { | ||
| klog.Errorf("Unable to append iptables rule \"%s\": %v\n", strings.Join(ruleSpec, " "), err) | ||
| } | ||
|
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| klog.V(4).Infof("Insert rule to allow traffic over %s interface in FORWARDing Chain", VXLAN_IFACE) | ||
| ruleSpec = []string{"-o", VXLAN_IFACE, "-j", "ACCEPT"} | ||
| if err = r.insertUnique(ipt, "filter", "FORWARD", 1, ruleSpec); err != nil { | ||
| klog.Errorf("Unable to insert iptable rule in filter table to allow vxlan traffic: %v", err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
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| func (r *Controller) programIptableRulesForInterClusterTraffic(remoteCidrBlock string) { | ||
| ipt, err := iptables.New() | ||
| if err != nil { | ||
| klog.Errorf("error while initializing iptables: %v", err) | ||
| } | ||
|
|
||
| for _, localClusterCidr := range r.localClusterCidr { | ||
| ruleSpec := []string{"-s", localClusterCidr, "-d", remoteCidrBlock, "-j", "ACCEPT"} | ||
| klog.V(4).Infof("Installing iptables rule for outgoing traffic: %s", strings.Join(ruleSpec, " ")) | ||
| if err = ipt.AppendUnique("nat", SM_POSTROUTING_CHAIN, ruleSpec...); err != nil { | ||
| klog.Errorf("error appending iptables rule \"%s\": %v\n", strings.Join(ruleSpec, " "), err) | ||
| } | ||
|
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| // Todo: revisit we only have to program to the PODCidr | ||
| ruleSpec = []string{"-s", remoteCidrBlock, "-d", localClusterCidr, "-j", "ACCEPT"} | ||
| klog.V(4).Infof("Installing iptables rule for incoming traffic: %s", strings.Join(ruleSpec, " ")) | ||
| if err = ipt.AppendUnique("nat", SM_POSTROUTING_CHAIN, ruleSpec...); err != nil { | ||
| klog.Errorf("error appending iptables rule \"%s\": %v\n", strings.Join(ruleSpec, " "), err) | ||
| } | ||
| } | ||
| } | ||
|
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| func (r *Controller) insertUnique(ipt *iptables.IPTables, table string, chain string, position int, ruleSpec []string) error { | ||
| rules, err := ipt.List(table, chain) | ||
| if err != nil { | ||
| return fmt.Errorf("error listing the rules in %s chain: %v", chain, err) | ||
| } | ||
|
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| if strings.Contains(rules[position], strings.Join(ruleSpec, " ")) { | ||
| klog.V(4).Infof("In %s table, iptables rule \"%s\", already exists.", table, strings.Join(ruleSpec, " ")) | ||
| return nil | ||
| } else { | ||
| if err = ipt.Insert(table, chain, position, ruleSpec...); err != nil { | ||
| klog.Errorf("In %s table, unable to insert iptables rule \"%s\": %v\n", table, strings.Join(ruleSpec, " "), err) | ||
| } | ||
| } | ||
| return nil | ||
| } |
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