From 35a7e43045f106f59f03f051a14293ae1769fef7 Mon Sep 17 00:00:00 2001
From: firestar5683 <168790843+firestar5683@users.noreply.github.com>
Date: Wed, 27 May 2026 16:37:32 -0500
Subject: [PATCH] blocky block

---
 opendbc_repo/opendbc/safety/modes/hyundai_canfd.h   | 13 +++++++++++++
 .../opendbc/safety/tests/test_hyundai_canfd.py      |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/opendbc_repo/opendbc/safety/modes/hyundai_canfd.h b/opendbc_repo/opendbc/safety/modes/hyundai_canfd.h
index 4d96fe939..eeadf2178 100644
--- a/opendbc_repo/opendbc/safety/modes/hyundai_canfd.h
+++ b/opendbc_repo/opendbc/safety/modes/hyundai_canfd.h
@@ -24,6 +24,9 @@
 #define HYUNDAI_CANFD_SCC_CONTROL_COMMON_TX_MSGS(e_can, longitudinal) \
   {0x1A0, e_can, 32, .check_relay = (longitudinal)},  /* SCC_CONTROL */ \
 
+#define HYUNDAI_CANFD_MRR35_RADAR_TRACK_START 0x3A5
+#define HYUNDAI_CANFD_MRR35_RADAR_TRACK_END 0x3C4
+
 #define HYUNDAI_CANFD_BLINDSPOT_DASH_TX_MSGS(e_can) \
   {0x1BA, e_can, 24, .check_relay = false},  /* BLINDSPOTS_REAR_CORNERS */ \
   {0x1E5, e_can, 16, .check_relay = false},  /* BLINDSPOTS_FRONT_CORNER_1 */ \
@@ -81,6 +84,15 @@ static void hyundai_canfd_rx_all_hook(const CANPacket_t *msg) {
   SAFETY_UNUSED(msg);
 }
 
+static bool hyundai_canfd_fwd_hook(int bus_num, int addr) {
+  const bool mrr35_radar_track = (addr >= HYUNDAI_CANFD_MRR35_RADAR_TRACK_START) && (addr <= HYUNDAI_CANFD_MRR35_RADAR_TRACK_END);
+
+  // On LKA-steering long-control cars using live MRR35 radar tracks, openpilot parses
+  // the tracks directly from bus 0. Forwarding them to bus 2 creates a returned TX copy
+  // of every object frame on the logged CAN stream without adding planner data.
+  return hyundai_longitudinal && hyundai_canfd_lka_steering && (bus_num == 0) && mrr35_radar_track;
+}
+
 static void hyundai_canfd_rx_hook(const CANPacket_t *msg) {
 
   const unsigned pt_bus = hyundai_canfd_lka_steering ? 1U : 0U;
@@ -485,4 +497,5 @@ const safety_hooks hyundai_canfd_hooks = {
   .get_counter = hyundai_canfd_get_counter,
   .get_checksum = hyundai_canfd_get_checksum,
   .compute_checksum = hyundai_common_canfd_compute_checksum,
+  .fwd = hyundai_canfd_fwd_hook,
 };
diff --git a/opendbc_repo/opendbc/safety/tests/test_hyundai_canfd.py b/opendbc_repo/opendbc/safety/tests/test_hyundai_canfd.py
index 75b7d7d8a..247936a0e 100755
--- a/opendbc_repo/opendbc/safety/tests/test_hyundai_canfd.py
+++ b/opendbc_repo/opendbc/safety/tests/test_hyundai_canfd.py
@@ -26,6 +26,8 @@ ALL_GAS_EV_HYBRID_COMBOS = [
   {"GAS_MSG": ("ACCELERATOR_ALT", "ACCELERATOR_PEDAL"), "SCC_BUS": 2, "SAFETY_PARAM": HyundaiSafetyFlags.HYBRID_GAS | HyundaiSafetyFlags.CAMERA_SCC},
 ]
 
+MRR35_RADAR_TRACK_ADDRS = list(range(0x3A5, 0x3C5))
+
 
 def _set_value(msg: bytearray, sig, ival: int) -> None:
   i = sig.lsb // 8
@@ -516,6 +518,7 @@ class TestHyundaiCanfdLKASteeringLongEV(HyundaiLongitudinalBase, TestHyundaiCanf
              [0x1a0, 1], [0x1ea, 1], [0x200, 1], [0x345, 1], [0x1da, 1]]
 
   RELAY_MALFUNCTION_ADDRS = {0: (0x50, 0x2a4), 1: (0x1a0,)}  # LKAS, CAM_0x2A4, SCC_CONTROL
+  FWD_BLACKLISTED_ADDRS = {0: MRR35_RADAR_TRACK_ADDRS, 2: [0x50, 0x2a4]}
 
   DISABLED_ECU_UDS_MSG = (0x730, 1)
   DISABLED_ECU_ACTUATION_MSG = (0x1a0, 1)