3 /* * <-1byte(8bits) -> * +---------------+ * | 0 | hopc |len| * +---------------+ * | len (cont) | * +---------------+ * | | * +- DDP csum -+ * | | * +---------------+ * | | * +- Dest NET -+ * | | * +---------------+ * | | * +- Src NET -+ * | | * +---------------+ * | Dest NODE | * +---------------+ * | Src NODE | * +---------------+ * | Dest PORT | * +---------------+ * | Src PORT | * +---------------+ * * On Apples, there is also a ddp_type field, after src_port. However, * under this unix implementation, user level processes need to be able * to set the ddp_type. In later revisions, the ddp_type may only be * available in a raw_appletalk interface. */