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Path MTU discovery for links

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Mark Qvist 2025-01-11 11:43:47 +01:00
parent 503f475ca5
commit bf6e73e163
5 changed files with 90 additions and 22 deletions
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34
RNS/Transport.py
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@ -1282,6 +1282,22 @@ class Transport:
now = time.time()
proof_timeout = Transport.extra_link_proof_timeout(packet.receiving_interface)
proof_timeout += now + RNS.Link.ESTABLISHMENT_TIMEOUT_PER_HOP * max(1, remaining_hops)
path_mtu = RNS.Link.mtu_from_lr_packet(packet)
nh_mtu = outbound_interface.HW_MTU
if path_mtu:
RNS.log(f"Seeing transported LR path MTU of {RNS.prettysize(path_mtu)}") # TODO: Remove debug
if outbound_interface.HW_MTU == None:
RNS.log(f"No next-hop HW MTU, disabling link MTU upgrade") # TODO: Remove debug
path_mtu = None
new_raw = new_raw[:RNS.Link.ECPUBSIZE]
else:
if nh_mtu < path_mtu:
path_mtu = nh_mtu
clamped_mtu = RNS.Link.mtu_bytes(path_mtu)
RNS.log(f"Clamping link MTU to {RNS.prettysize(nh_mtu)}: {RNS.hexrep(clamped_mtu)}") # TODO: Remove debug
RNS.log(f"New raw: {RNS.hexrep(new_raw)}")
new_raw = new_raw[:-RNS.Link.LINK_MTU_SIZE]+clamped_mtu
# Entry format is
link_entry = [ now, # 0: Timestamp,
@ -1294,7 +1310,7 @@ class Transport:
False, # 7: Validated
proof_timeout] # 8: Proof timeout timestamp
Transport.link_table[packet.getTruncatedHash()] = link_entry
Transport.link_table[RNS.Link.link_id_from_lr_packet(packet)] = link_entry
else:
# Entry format is
@ -1790,12 +1806,16 @@ class Transport:
if packet.hops == link_entry[3]:
if packet.receiving_interface == link_entry[2]:
try:
if len(packet.data) == RNS.Identity.SIGLENGTH//8+RNS.Link.ECPUBSIZE//2:
if len(packet.data) == RNS.Identity.SIGLENGTH//8+RNS.Link.ECPUBSIZE//2 or len(packet.data) == RNS.Identity.SIGLENGTH//8+RNS.Link.ECPUBSIZE//2+RNS.Link.LINK_MTU_SIZE:
mtu_bytes = b""
if len(packet.data) == RNS.Identity.SIGLENGTH//8+RNS.Link.ECPUBSIZE//2+RNS.Link.LINK_MTU_SIZE:
mtu_bytes = RNS.Link.mtu_bytes(RNS.Link.mtu_from_lp_packet(packet))
peer_pub_bytes = packet.data[RNS.Identity.SIGLENGTH//8:RNS.Identity.SIGLENGTH//8+RNS.Link.ECPUBSIZE//2]
peer_identity = RNS.Identity.recall(link_entry[6])
peer_sig_pub_bytes = peer_identity.get_public_key()[RNS.Link.ECPUBSIZE//2:RNS.Link.ECPUBSIZE]
signed_data = packet.destination_hash+peer_pub_bytes+peer_sig_pub_bytes
signed_data = packet.destination_hash+peer_pub_bytes+peer_sig_pub_bytes+mtu_bytes
signature = packet.data[:RNS.Identity.SIGLENGTH//8]
if peer_identity.validate(signature, signed_data):
@ -2189,6 +2209,14 @@ class Transport:
else:
return None
@staticmethod
def next_hop_interface_hw_mtu(destination_hash):
next_hop_interface = Transport.next_hop_interface(destination_hash)
if next_hop_interface != None:
return next_hop_interface.HW_MTU
else:
return None
@staticmethod
def next_hop_per_bit_latency(destination_hash):
next_hop_interface_bitrate = Transport.next_hop_interface_bitrate(destination_hash)