diff --git a/libc/kernel/uapi/linux/can/isotp.h b/libc/kernel/uapi/linux/can/isotp.h
index cff12d6..407f6ca 100644
--- a/libc/kernel/uapi/linux/can/isotp.h
+++ b/libc/kernel/uapi/linux/can/isotp.h
@@ -45,6 +45,7 @@
 #define CAN_ISOTP_WAIT_TX_DONE 0x0400
 #define CAN_ISOTP_SF_BROADCAST 0x0800
 #define CAN_ISOTP_CF_BROADCAST 0x1000
+#define CAN_ISOTP_DYN_FC_PARMS 0x2000
 #define CAN_ISOTP_DEFAULT_FLAGS 0
 #define CAN_ISOTP_DEFAULT_EXT_ADDRESS 0x00
 #define CAN_ISOTP_DEFAULT_PAD_CONTENT 0xCC
diff --git a/libc/kernel/uapi/linux/can/raw.h b/libc/kernel/uapi/linux/can/raw.h
index 940a852..8e47899 100644
--- a/libc/kernel/uapi/linux/can/raw.h
+++ b/libc/kernel/uapi/linux/can/raw.h
@@ -20,5 +20,15 @@
   CAN_RAW_FD_FRAMES,
   CAN_RAW_JOIN_FILTERS,
   CAN_RAW_XL_FRAMES,
+  CAN_RAW_XL_VCID_OPTS,
 };
+struct can_raw_vcid_options {
+  __u8 flags;
+  __u8 tx_vcid;
+  __u8 rx_vcid;
+  __u8 rx_vcid_mask;
+};
+#define CAN_RAW_XL_VCID_TX_SET 0x01
+#define CAN_RAW_XL_VCID_TX_PASS 0x02
+#define CAN_RAW_XL_VCID_RX_FILTER 0x04
 #endif