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Last-hop LR MTU clamping

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This commit is contained in:
Mark Qvist 2025-01-12 17:31:17 +01:00
parent 47eba03a4b
commit a0f219f7f4
1 changed files with 18 additions and 4 deletions
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22
RNS/Transport.py
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@ -1333,15 +1333,14 @@ class Transport:
nh_mtu = outbound_interface.HW_MTU
if path_mtu:
if outbound_interface.HW_MTU == None:
RNS.log(f"No next-hop HW MTU, disabling link MTU upgrade") # TODO: Remove debug
RNS.log(f"No next-hop HW MTU, disabling link MTU upgrade", RNS.LOG_DEBUG) # TODO: Remove debug
path_mtu = None
new_raw = new_raw[:RNS.Link.ECPUBSIZE]
new_raw = new_raw[:RNS.Link.ECPUBSIZE] # TODO: Fix this
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)}")
RNS.log(f"Clamping link MTU to {RNS.prettysize(nh_mtu)}: {RNS.hexrep(clamped_mtu)}", RNS.LOG_DEBUG) # TODO: Remove debug
new_raw = new_raw[:-RNS.Link.LINK_MTU_SIZE]+clamped_mtu
# Entry format is
@ -1794,6 +1793,21 @@ class Transport:
if packet.transport_id == None or packet.transport_id == Transport.identity.hash:
for destination in Transport.destinations:
if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
path_mtu = RNS.Link.mtu_from_lr_packet(packet)
nh_mtu = packet.receiving_interface.HW_MTU
RNS.log(f"Final hop path MTU of {path_mtu}, possible MTU is {nh_mtu}", RNS.LOG_DEBUG) # TODO: Remove debug
if path_mtu:
if packet.receiving_interface.HW_MTU == None:
RNS.log(f"No next-hop HW MTU, disabling link MTU upgrade", RNS.LOG_DEBUG) # TODO: Remove debug
path_mtu = None
packet.data = packet.data[:RNS.Link.ECPUBSIZE] # TODO: Fix this
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)}", RNS.LOG_DEBUG) # TODO: Remove debug
packet.data = packet.data[:-RNS.Link.LINK_MTU_SIZE]+clamped_mtu
packet.destination = destination
destination.receive(packet)