-
Notifications
You must be signed in to change notification settings - Fork 103
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
459f2e3
commit 0c8a3e2
Showing
5 changed files
with
133 additions
and
26 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // Copyright 2019-2023 The Liqo Authors | ||
| // | ||
| // 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 tunneloperator | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/coreos/go-iptables/iptables" | ||
| utilruntime "k8s.io/apimachinery/pkg/util/runtime" | ||
| "k8s.io/apimachinery/pkg/util/wait" | ||
| "k8s.io/klog/v2" | ||
|
|
||
| liqonetsignals "github.com/liqotech/liqo/pkg/liqonet/utils/signals" | ||
| ) | ||
|
|
||
| const ( | ||
| filterTable = "filter" | ||
| ) | ||
|
|
||
| type firewallRule struct { | ||
| table string | ||
| chain string | ||
| rule []string | ||
| } | ||
|
|
||
| func (fr *firewallRule) String() string { | ||
| ruleString := strings.Join(fr.rule, " ") | ||
| return strings.Join([]string{fr.table, fr.chain, ruleString}, " ") | ||
| } | ||
|
|
||
| func enforceFirewallRules(ctx context.Context, wg *sync.WaitGroup, ipt *iptables.IPTables, ifaceName string) { | ||
| wg.Add(1) | ||
| defer wg.Done() | ||
| err := wait.PollUntilContextCancel(ctx, 5*time.Second, false, func(ctx context.Context) (done bool, err error) { | ||
| rules := generateForwardingRules(ifaceName) | ||
| for i := range rules { | ||
| if err := addRule(ipt, &rules[i]); err != nil { | ||
| return false, err | ||
| } | ||
| } | ||
| return false, nil | ||
| }) | ||
| if err != nil && ctx.Err() == nil { | ||
| klog.Errorf("Unable to enforce firewall rules: %v", err) | ||
| utilruntime.Must(liqonetsignals.Shutdown()) | ||
| } | ||
| } | ||
|
|
||
| // generateRules generates the firewall rules for the given overlay interface. | ||
| func generateForwardingRules(ifaceName string) []firewallRule { | ||
| comment := fmt.Sprintf("LIQO accept traffic from/to overlay interface %s", ifaceName) | ||
| return []firewallRule{ | ||
| { | ||
| table: filterTable, | ||
| chain: "INPUT", | ||
| rule: []string{"-i", ifaceName, "-j", "ACCEPT", "-m", "comment", "--comment", comment}, | ||
| }, | ||
| { | ||
| table: filterTable, | ||
| chain: "FORWARD", | ||
| rule: []string{"-i", ifaceName, "-j", "ACCEPT", "-m", "comment", "--comment", comment}, | ||
| }, | ||
| { | ||
| table: filterTable, | ||
| chain: "OUTPUT", | ||
| rule: []string{"-o", ifaceName, "-j", "ACCEPT", "-m", "comment", "--comment", comment}, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // addRule appends the rule if it does not exist. | ||
| func addRule(ipt *iptables.IPTables, rule *firewallRule) error { | ||
| return ipt.AppendUnique(rule.table, rule.chain, rule.rule...) | ||
| } | ||
|
|
||
| // deleteRule removes the rule if it exists. | ||
| func deleteRule(ipt *iptables.IPTables, rule *firewallRule) error { | ||
| return ipt.DeleteIfExists(rule.table, rule.chain, rule.rule...) | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters