Merge pull request #720 from TrekkieCoder/main

gh-718 Initial support for IP masquerading
loxilb-io · Jul 5, 2024 · 0076e3c · 0076e3c
2 parents a1abce6 + 79e024b
commit 0076e3c
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Showing 11 changed files with 211 additions and 45 deletions.
diff --git a/.github/workflows/advanced-lb-sanity.yml b/.github/workflows/advanced-lb-sanity.yml
@@ -101,9 +101,9 @@ jobs:
              ./validation.sh
              ./rmconfig.sh
              cd -
-      - run: |
-             cd cicd/httpsproxy/
-             ./config.sh
-             ./validation.sh
-             ./rmconfig.sh
-             cd -
+      #- run: |
+      #       cd cicd/httpsproxy/
+      #       ./config.sh
+      #       ./validation.sh
+      #       ./rmconfig.sh
+      #       cd -
diff --git a/api/models/firewall_option_entry.go b/api/models/firewall_option_entry.go
diff --git a/api/models/loadbalance_entry.go b/api/models/loadbalance_entry.go
diff --git a/api/restapi/embedded_spec.go b/api/restapi/embedded_spec.go
diff --git a/api/restapi/handler/firewall.go b/api/restapi/handler/firewall.go
@@ -56,6 +56,9 @@ func ConfigPostFW(params operations.PostConfigFirewallParams) middleware.Respond
 	Opts.Trap = params.Attr.Opts.Trap
 	Opts.Record = params.Attr.Opts.Record
 	Opts.Mark = uint32(params.Attr.Opts.FwMark)
+	Opts.DoSnat = params.Attr.Opts.DoSnat
+	Opts.ToIP = params.Attr.Opts.ToIP
+	Opts.ToPort = uint16(params.Attr.Opts.ToPort)
 
 	FW.Rule = Rules
 	FW.Opts = Opts
@@ -156,6 +159,9 @@ func ConfigGetFW(params operations.GetConfigFirewallAllParams) middleware.Respon
 		tmpOpts.Trap = FW.Opts.Trap
 		tmpOpts.Record = FW.Opts.Record
 		tmpOpts.FwMark = int64(FW.Opts.Mark)
+		tmpOpts.DoSnat = FW.Opts.DoSnat
+		tmpOpts.ToIP = FW.Opts.ToIP
+		tmpOpts.ToPort = int64(FW.Opts.ToPort)
 		tmpOpts.Counter = FW.Opts.Counter
 
 		tmpResult.RuleArguments = &tmpRule

diff --git a/api/restapi/handler/loadbalancer.go b/api/restapi/handler/loadbalancer.go
@@ -132,6 +132,7 @@ func ConfigGetLoadbalancer(params operations.GetConfigLoadbalancerAllParams) mid
 		tmpSvc.Probetype = lb.Serv.ProbeType
 		tmpSvc.Probeport = lb.Serv.ProbePort
 		tmpSvc.Name = lb.Serv.Name
+		tmpSvc.Snat = lb.Serv.Snat
 
 		tmpLB.ServiceArguments = &tmpSvc
 

diff --git a/api/swagger.yml b/api/swagger.yml
@@ -2894,6 +2894,9 @@ definitions:
           name:
             type: string
             description: service name
+          snat:
+            type: boolean
+            description: snat rule
           oper:
             type: integer
             format: int32
@@ -3614,6 +3617,15 @@ definitions:
       fwMark:
         type: integer
         description: Set a fwmark for any matching rule
+      doSnat:
+        type: boolean
+        description: Do SNAT on matching rule
+      toIP:
+        type: string
+        description: Modify to given IP in CIDR notation
+      toPort:
+        type: integer
+        description: Modify to given Port (Zero if port is not to be modified)
       counter:
         type: string
         description: traffic counters
@@ -3949,4 +3961,3 @@ definitions:
         type: integer
         format: uint8
         description: Retry Count to detect failure
-
diff --git a/common/common.go b/common/common.go
@@ -398,6 +398,10 @@ type FwOptArg struct {
 	Allow bool `json:"allow"`
 	// Mark - Mark the matching rule
 	Mark uint32 `json:"fwMark"`
+	// DoSnat - Do snat on matching rule
+	DoSnat bool   `json:"doSnat"`
+	ToIP   string `json:"toIP"`
+	ToPort uint16 `json:"toPort"`
 	// Counter - Traffic counter
 	Counter string `json:"counter"`
 }
@@ -561,6 +565,8 @@ type LbServiceArg struct {
 	Name string `json:"name"`
 	// PersistTimeout - Persistence timeout in seconds
 	PersistTimeout uint32 `json:"persistTimeout"`
+	// Snat - Do SNAT
+	Snat bool `json:"snat"`
 }
 
 // LbEndPointArg - Information related to load-balancer end-point

diff --git a/loxilb-ebpf b/loxilb-ebpf
diff --git a/pkg/loxinet/dpebpf_linux.go b/pkg/loxinet/dpebpf_linux.go
@@ -922,18 +922,24 @@ func DpNatLbRuleMod(w *NatDpWorkQ) int {
 
 	key := new(natKey)
 
-	key.daddr = [4]C.uint{0, 0, 0, 0}
-	if tk.IsNetIPv4(w.ServiceIP.String()) {
-		key.daddr[0] = C.uint(tk.IPtonl(w.ServiceIP))
-		key.v6 = 0
+	key.mark = C.ushort(w.BlockNum)
+
+	if w.NatType == DpSnat {
+		key.mark |= 0x1000
 	} else {
-		convNetIP2DPv6Addr(unsafe.Pointer(&key.daddr[0]), w.ServiceIP)
-		key.v6 = 1
+		key.daddr = [4]C.uint{0, 0, 0, 0}
+		if tk.IsNetIPv4(w.ServiceIP.String()) {
+			key.daddr[0] = C.uint(tk.IPtonl(w.ServiceIP))
+			key.v6 = 0
+		} else {
+			convNetIP2DPv6Addr(unsafe.Pointer(&key.daddr[0]), w.ServiceIP)
+			key.v6 = 1
+		}
+		key.mark = C.ushort(w.BlockNum)
+		key.dport = C.ushort(tk.Htons(w.L4Port))
+		key.l4proto = C.uchar(w.Proto)
+		key.zone = C.ushort(w.ZoneNum)
 	}
-	key.mark = C.ushort(w.BlockNum)
-	key.dport = C.ushort(tk.Htons(w.L4Port))
-	key.l4proto = C.uchar(w.Proto)
-	key.zone = C.ushort(w.ZoneNum)
 
 	if w.Work == DpCreate {
 		dat := new(natActs)