feat: bridge mixed wire protocol SUDP payloads

SUDP payload codec follows transport wireProtocol; same-protocol v1/v1 and v2/v2 keep raw join; only mixed proxy/visitor protocols use message-aware bridge; no new capability/selection field.

Release.md

@@ -1,9 +1,11 @@
 ## Features
 
-* `transport.wireProtocol = "v2"` now also applies to UDP-based proxy payloads, including ordinary UDP and SUDP, so their payload framing is consistent with the selected wire protocol.
+* When `transport.wireProtocol = "v2"` is enabled, ordinary UDP proxy work connection payloads now use wire protocol v2 message framing. This keeps UDP message payloads aligned with the negotiated frpc/frps wire protocol.
-* Improved SUDP compatibility during mixed `transport.wireProtocol` deployments, allowing frps to bridge payloads between v1/default and v2 SUDP clients.
+* SUDP proxy payloads now also follow the connection wire protocol. SUDP v2 endpoints use wire protocol v2 message framing, while v1/default endpoints continue to use the legacy message codec. When the SUDP proxy frpc and visitor frpc use mixed v1/v2 wire protocols, frps bridges UDPPacket messages between the two codecs.
-* XTCP work connection `NatHoleSid` messages now follow the selected `transport.wireProtocol`.
 
 ## Compatibility Notes
 
-* When enabling `transport.wireProtocol = "v2"` for SUDP, upgrade both the proxy and visitor frpc instances first, or keep them on `v1` until both sides are upgraded.
+* The default/empty `transport.wireProtocol` and `transport.wireProtocol = "v1"` continue to use the legacy message codec for ordinary UDP and SUDP proxy payloads.
+* Raw stream proxy paths such as TCP, HTTP, and STCP remain unframed and are not affected by the UDP/SUDP payload framing change.
+* Direct NAT hole UDP sid probing packets are not changed by this release.
+* `transport.wireProtocol = "v2"` requires peers to use versions that support the same wire v2 payload semantics. Mixing a newer peer that sends v2-framed UDP or SUDP payloads with an older v2-capable peer that still expects the legacy payload codec can break that proxy traffic. During rolling upgrades, upgrade both SUDP proxy and visitor frpc instances before enabling `transport.wireProtocol = "v2"` for SUDP, or keep those clients on `transport.wireProtocol = "v1"` until both sides are upgraded.

pkg/util/version/version.go

@@ -14,7 +14,7 @@
 
 package version
 
-var version = "0.69.1"
+var version = "0.69.0"
 
 func Full() string {
 	return version

test/e2e/compatibility/compatibility_test.go

@@ -7,8 +7,6 @@ import (
 	"io"
 	"net/http"
 	"os"
-	"strconv"
-	"strings"
 	"testing"
 	"time"
 
@@ -160,7 +158,7 @@ webServer.port = %d
 		framework.NewRequestExpect(f).PortName(portName).Ensure()
 	})
 
-	ginkgo.It("baseline frps handles current frpc forced to v2 according to baseline support", func() {
+	ginkgo.It("baseline frps rejects current frpc forced to v2", func() {
 		portName := port.GenName("CompatBaselineFRPSForcedV2")
 		clientConf := tcpClientConfig("tcp", portName, `
 transport.wireProtocol = "v2"
@@ -172,21 +170,6 @@ transport.wireProtocol = "v2"
 			consts.DefaultServerConfig,
 			[]string{clientConf},
 		)
-
-		// frp v0.69.0 added control connection wireProtocol v2 support, so
-		// baseline frps v0.69.0 and newer should accept a current frpc forced
-		// to v2. Older known baselines still must reject the unsupported protocol.
-		// For custom baselines, the version is unknown and the binary may be either
-		// side of the support boundary, so this versioned expectation is skipped.
-		supportsV2, knownVersion := baselineSupportsControlWireProtocolV2(compatCtx.BaselineVersion)
-		if !knownVersion {
-			ginkgo.Skip(fmt.Sprintf("baseline version %q is not semver; skip versioned forced-v2 expectation", compatCtx.BaselineVersion))
-		}
-		if supportsV2 {
-			framework.NewRequestExpect(f).PortName(portName).Ensure()
-			return
-		}
-
 		expectProcessExit(clientProcesses[0], 5*time.Second)
 		framework.NewRequestExpect(f).PortName(portName).ExpectError(true).Ensure()
 	})
@@ -216,39 +199,6 @@ func expectProcessExit(p *process.Process, timeout time.Duration) {
 	}
 }
 
-func baselineSupportsControlWireProtocolV2(version string) (supports bool, known bool) {
-	version = strings.TrimPrefix(version, "v")
-	parts := strings.Split(version, ".")
-	if len(parts) != 3 {
-		return false, false
-	}
-
-	major, err := strconv.Atoi(parts[0])
-	if err != nil {
-		return false, false
-	}
-	minor, err := strconv.Atoi(parts[1])
-	if err != nil {
-		return false, false
-	}
-	patch, err := strconv.Atoi(parts[2])
-	if err != nil {
-		return false, false
-	}
-
-	return compareSemanticVersion(major, minor, patch, 0, 69, 0) >= 0, true
-}
-
-func compareSemanticVersion(major, minor, patch int, baseMajor, baseMinor, basePatch int) int {
-	if major != baseMajor {
-		return major - baseMajor
-	}
-	if minor != baseMinor {
-		return minor - baseMinor
-	}
-	return patch - basePatch
-}
-
 type wireClientInfo struct {
 	ClientID     string `json:"clientID"`
 	WireProtocol string `json:"wireProtocol"`