Hysteria transport: Add congestion config (""/"reno"/"bbr"/"brutal"/"force-brutal") (#5549)

Closes https://github.com/XTLS/Xray-core/issues/5546

proxy/hysteria/client.go

@@ -17,6 +17,7 @@ import (
 	"github.com/xtls/xray-core/common/task"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/policy"
+	hyCtx "github.com/xtls/xray-core/proxy/hysteria/ctx"
 	"github.com/xtls/xray-core/transport"
 	"github.com/xtls/xray-core/transport/internet"
 	"github.com/xtls/xray-core/transport/internet/hysteria"
@@ -55,6 +56,9 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 	ob.CanSpliceCopy = 3
 	target := ob.Target
 
+	if target.Network == net.Network_UDP {
+		hyCtx.ContextWithRequireDatagram(ctx)
+	}
 	conn, err := dialer.Dial(ctx, c.server.Destination)
 	if err != nil {
 		return errors.New("failed to find an available destination").AtWarning().Base(err)

proxy/hysteria/ctx/ctx.go

@@ -0,0 +1,20 @@
+package ctx
+
+import (
+	"context"
+)
+
+type key int
+
+const (
+	requireDatagram key = iota
+)
+
+func ContextWithRequireDatagram(ctx context.Context) context.Context {
+	return context.WithValue(ctx, requireDatagram, struct{}{})
+}
+
+func RequireDatagramFromContext(ctx context.Context) bool {
+	_, ok := ctx.Value(requireDatagram).(struct{})
+	return ok
+}