Packet Layout
Revision as of 14:13, 31 October 2006 by Phoenix Linden (talk | contribs)
Packet Structure
Header:
- Bytes 0: Packet Information
- LL_ACK_FLAG 0x10
- LL_RESENT_FLAG 0x20
- LL_RELIABLE_FLAG 0x40
- LL_ZERO_CODE_FLAG 0x80
- LL_SIGNED_FLAG 0x08 | 0x04 - Allows us to have 4 choices for signing (None, UMAC, HMAC, ???)
- Bytes 1-4: Packet ID, assigned by circuit
If LL_SIGNED_FLAG
- Bytes 5-13: UMAC Tag
- 64-bit signature for packet, signed after zero coding
- Everything beyond this is zerocoded for compression
- Bytes n thru n+(frequency size)
- 1/2/4 byte ID of the message the packet contains
- Bytes n thru n+(data length)
- Body of packet, possibly zero coded.
- Bytes n+(data length) thru acks
- Rest of packet is fill with as many acks as will fit from reliable messages