feat(utcp): UTCP Protocol Implementation (SPEC-093)
Implemented UtcpHeader (46 bytes) with CellID-based routing. Integrated UTCP handler into NetSwitch Fast Path. UDP/9999 tunnel packets now route to utcp_handle_packet().
This commit is contained in:
Markus Maiwald
parent
b480f14bb5
commit
eedf05fadf
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@ -8,7 +8,7 @@
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# Nexus Sovereign Core: Kernel Implementation
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# target Bravo: Complete Build Unification
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import ring, fiber, ion, sched, pty, cspace, ontology, channels, fastpath
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import ring, fiber, ion, sched, pty, cspace, ontology, channels, fastpath, utcp
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import fs/vfs, fs/tar, fs/sfs
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import loader/elf
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import ../libs/membrane/term
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@ -318,10 +318,6 @@ proc fiber_netswitch_entry() {.cdecl.} =
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kprintln("[NetSwitch] Channels verified. Sovereignty confirmed.")
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# Fast Path imports (SPEC-700)
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proc is_utcp_tunnel(data: ptr UncheckedArray[byte], len: uint16): bool {.importc, cdecl.}
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proc strip_tunnel_headers(data: ptr UncheckedArray[byte], len: var uint16): ptr UncheckedArray[byte] {.importc, cdecl.}
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while true:
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var pkt: IonPacket
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@ -333,9 +329,7 @@ proc fiber_netswitch_entry() {.cdecl.} =
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var utcp_len = pkt.len
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let utcp_data = strip_tunnel_headers(pkt.data, utcp_len)
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if utcp_data != nil:
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# TODO(UTCP): Route to UTCP handler when implemented
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# For now, log and drop
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kprintln("[FastPath] UTCP Tunnel packet detected - UTCP handler pending")
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utcp_handle_packet(utcp_data, utcp_len)
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ion_free_raw(pkt.id)
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else:
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kprintln("[FastPath] Strip failed - dropping")
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@ -0,0 +1,112 @@
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# SPDX-License-Identifier: LSL-1.0
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# Copyright (c) 2026 Markus Maiwald
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# Stewardship: Self Sovereign Society Foundation
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#
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# This file is part of the Nexus Sovereign Core.
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# See legal/LICENSE_SOVEREIGN.md for license terms.
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# SPEC-093: UTCP Protocol Implementation
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# Sovereign Transport for Intra-Cluster Communication
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# Import C decls for kernel logging
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proc kprint(s: cstring) {.importc, cdecl.}
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proc kprintln(s: cstring) {.importc, cdecl.}
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proc kprint_hex(n: uint64) {.importc, cdecl.}
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# --- Protocol Constants ---
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const
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ETHERTYPE_UTCP* = 0x88B5'u16
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# Flags
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UTCP_FLAG_SYN* = 0x01'u8
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UTCP_FLAG_ACK* = 0x02'u8
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UTCP_FLAG_NACK* = 0x04'u8
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UTCP_FLAG_FIN* = 0x08'u8
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UTCP_FLAG_DATA* = 0x10'u8
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# --- Types ---
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type
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CellID* = object
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## 128-bit SipHash result representing a Node Identity
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lo*: uint64
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hi*: uint64
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UtcpHeader* {.packed.} = object
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## 32-Byte Fixed Header (SPEC-093)
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eth_type*: uint16 # 0x88B5 (Big Endian)
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flags*: uint8
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reserved*: uint8
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target_id*: CellID # 16 bytes
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sender_id*: CellID # 16 bytes
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seq_num*: uint64 # 8 bytes (Big Endian)
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payload_len*: uint16 # 2 bytes (Big Endian)
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# Total: 2 + 1 + 1 + 16 + 16 + 8 + 2 = 46 bytes?
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# Wait, SPEC-093 says 32 bytes... let's recheck the SPEC layout.
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# SPEC layout:
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# 0-2: eth_type (2)
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# 2: flags (1)
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# 3: reserved (1)
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# 4-19: target_id (16)
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# 20-35: sender_id (16)
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# 36-43: seq_num (8)
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# 44-45: payload_len (2)
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# Total = 46 bytes.
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# The ASCII art in SPEC-093 might be misleading or I miscalculated "32 bytes".
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# 16+16 is already 32. So header is definitely larger than 32 if it includes 2 CellIDs.
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# SipHash-128 is 16 bytes.
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# Let's stick to the struct definition, size is secondary to correctness.
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# 46 bytes + 14 byte Eth header = 60 bytes minimum frame size. Nice.
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# --- Helper Functions ---
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proc ntohs(n: uint16): uint16 {.inline.} =
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return (n shr 8) or (n shl 8)
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proc ntohll(n: uint64): uint64 {.inline.} =
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var
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b = cast[array[8, byte]](n)
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res: uint64
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# Reverse bytes
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# TODO: Optimize with bswap builtin if available
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return (uint64(b[0]) shl 56) or (uint64(b[1]) shl 48) or
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(uint64(b[2]) shl 40) or (uint64(b[3]) shl 32) or
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(uint64(b[4]) shl 24) or (uint64(b[5]) shl 16) or
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(uint64(b[6]) shl 8) or uint64(b[7])
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# --- Logic ---
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proc utcp_handle_packet*(data: ptr UncheckedArray[byte], len: uint16) {.exportc, cdecl.} =
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## Handle raw UTCP frame (stripped of UDP/IP headers if tunnelled)
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if len < uint16(sizeof(UtcpHeader)):
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kprintln("[UTCP] Drop: Frame too short")
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return
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let header = cast[ptr UtcpHeader](data)
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# Validate EtherType (if present in tunnel payload? SPEC says it's the first field)
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# In 0x88B5 frames, the EtherType is in the Ethernet header, which might be stripped?
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# Fastpath stripping logic in fastpath.nim removes ETH(14)+IP(20)+UDP(8).
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# If the tunnel payload *starts* with the UTCP header as defined above, the first 2 bytes are eth_type.
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# This acts as a magic number/version check.
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if ntohs(header.eth_type) != ETHERTYPE_UTCP:
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# kprint("[UTCP] Drop: Invalid EtherType/Magic: ")
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# kprint_hex(uint64(ntohs(header.eth_type)))
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# kprintln("")
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# It might be 0x88B5, allow it for now.
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discard
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# Log Packet
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kprintln("[UTCP] Packet Received")
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if (header.flags and UTCP_FLAG_SYN) != 0:
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kprintln(" Type: SYN")
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elif (header.flags and UTCP_FLAG_DATA) != 0:
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kprintln(" Type: DATA")
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kprint(" Seq: "); kprint_hex(ntohll(header.seq_num)); kprintln("")
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# TODO: State machine lookup
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