From ea18a0d490bee428f6c90106241cd8956b4c1854 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Tue, 31 Mar 2026 15:37:10 +0800
Subject: [PATCH] dns: populate reverse mapping for legacy predefined responses

The legacy path returned predefined responses early, bypassing the
reverse mapping cache. Use goto to reach the shared post-exchange
block so both legacy and new paths record predefined A/AAAA answers.
---
 dns/router.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dns/router.go b/dns/router.go
index ae986d712..0d0c9519d 100644
--- a/dns/router.go
+++ b/dns/router.go
@@ -759,7 +759,9 @@ func (r *Router) Exchange(ctx context.Context, message *mDNS.Msg, options adapte
 						return nil, tun.ErrDrop
 					}
 				case *R.RuleActionPredefined:
-					return action.Response(message), nil
+					err = nil
+					response = action.Response(message)
+					goto done
 				}
 			}
 			responseCheck := addressLimitResponseCheck(rule, metadata)
@@ -787,6 +789,7 @@ func (r *Router) Exchange(ctx context.Context, message *mDNS.Msg, options adapte
 			break
 		}
 	}
+done:
 	if err != nil {
 		return nil, err
 	}