chore(netlink): debug log ip rule commands in netlink instead of routing package

internal/netlink/helpers_test.go

@@ -0,0 +1,8 @@
+package netlink
+
+import "net/netip"
+
+func makeNetipPrefix(n byte) netip.Prefix {
+	const bits = 24
+	return netip.PrefixFrom(netip.AddrFrom4([4]byte{n, n, n, 0}), bits)
+}

internal/netlink/interfaces.go

@@ -3,6 +3,7 @@ package netlink
 import "github.com/qdm12/log"
 
 type DebugLogger interface {
+	Debug(message string)
 	Debugf(format string, args ...any)
 	Patch(options ...log.Option)
 }

internal/netlink/rule.go

@@ -3,6 +3,8 @@
 package netlink
 
 import (
+	"fmt"
+
 	"github.com/vishvananda/netlink"
 )
 
@@ -17,6 +19,15 @@ func NewRule() Rule {
 }
 
 func (n *NetLink) RuleList(family int) (rules []Rule, err error) {
+	switch family {
+	case FamilyAll:
+		n.debugLogger.Debug("ip -4 rule list")
+		n.debugLogger.Debug("ip -6 rule list")
+	case FamilyV4:
+		n.debugLogger.Debug("ip -4 rule list")
+	case FamilyV6:
+		n.debugLogger.Debug("ip -6 rule list")
+	}
 	netlinkRules, err := netlink.RuleList(family)
 	if err != nil {
 		return nil, err
@@ -30,11 +41,13 @@ func (n *NetLink) RuleList(family int) (rules []Rule, err error) {
 }
 
 func (n *NetLink) RuleAdd(rule Rule) error {
+	n.debugLogger.Debug(ruleDbgMsg(true, rule))
 	netlinkRule := ruleToNetlinkRule(rule)
 	return netlink.RuleAdd(&netlinkRule)
 }
 
 func (n *NetLink) RuleDel(rule Rule) error {
+	n.debugLogger.Debug(ruleDbgMsg(false, rule))
 	netlinkRule := ruleToNetlinkRule(rule)
 	return netlink.RuleDel(&netlinkRule)
 }
@@ -62,3 +75,31 @@ func netlinkRuleToRule(netlinkRule netlink.Rule) (rule Rule) {
 		Invert:   netlinkRule.Invert,
 	}
 }
+
+func ruleDbgMsg(add bool, rule Rule) (debugMessage string) {
+	debugMessage = "ip rule"
+
+	if add {
+		debugMessage += " add"
+	} else {
+		debugMessage += " del"
+	}
+
+	if rule.Src.IsValid() {
+		debugMessage += " from " + rule.Src.String()
+	}
+
+	if rule.Dst.IsValid() {
+		debugMessage += " to " + rule.Dst.String()
+	}
+
+	if rule.Table != 0 {
+		debugMessage += " lookup " + fmt.Sprint(rule.Table)
+	}
+
+	if rule.Priority != -1 {
+		debugMessage += " pref " + fmt.Sprint(rule.Priority)
+	}
+
+	return debugMessage
+}

internal/netlink/rule_test.go

@@ -0,0 +1,50 @@
+package netlink
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_ruleDbgMsg(t *testing.T) {
+	t.Parallel()
+
+	testCases := map[string]struct {
+		add    bool
+		rule   Rule
+		dbgMsg string
+	}{
+		"default values": {
+			dbgMsg: "ip rule del pref 0",
+		},
+		"add rule": {
+			add: true,
+			rule: Rule{
+				Src:      makeNetipPrefix(1),
+				Dst:      makeNetipPrefix(2),
+				Table:    100,
+				Priority: 101,
+			},
+			dbgMsg: "ip rule add from 1.1.1.0/24 to 2.2.2.0/24 lookup 100 pref 101",
+		},
+		"del rule": {
+			rule: Rule{
+				Src:      makeNetipPrefix(1),
+				Dst:      makeNetipPrefix(2),
+				Table:    100,
+				Priority: 101,
+			},
+			dbgMsg: "ip rule del from 1.1.1.0/24 to 2.2.2.0/24 lookup 100 pref 101",
+		},
+	}
+
+	for name, testCase := range testCases {
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			dbgMsg := ruleDbgMsg(testCase.add, testCase.rule)
+
+			assert.Equal(t, testCase.dbgMsg, dbgMsg)
+		})
+	}
+}