mirror of
https://github.com/markqvist/Reticulum.git
synced 2024-11-23 06:00:18 +00:00
Implemented ability to change MTU.
This commit is contained in:
parent
40f7a6d359
commit
cd8de64201
@ -34,12 +34,13 @@ class Identity:
|
|||||||
"""
|
"""
|
||||||
|
|
||||||
# Non-configurable constants
|
# Non-configurable constants
|
||||||
AES_HMAC_OVERHEAD = 58 # In bytes
|
FERNET_VERSION = 0x80
|
||||||
|
FERNET_OVERHEAD = 57 # In bytes
|
||||||
AES128_BLOCKSIZE = 16 # In bytes
|
AES128_BLOCKSIZE = 16 # In bytes
|
||||||
HASHLENGTH = 256 # In bits
|
HASHLENGTH = 256 # In bits
|
||||||
SIGLENGTH = KEYSIZE # In bits
|
SIGLENGTH = KEYSIZE # In bits
|
||||||
|
|
||||||
TRUNCATED_HASHLENGTH = 80 # In bits
|
TRUNCATED_HASHLENGTH = RNS.Reticulum.TRUNCATED_HASHLENGTH
|
||||||
"""
|
"""
|
||||||
Constant specifying the truncated hash length (in bits) used by Reticulum
|
Constant specifying the truncated hash length (in bits) used by Reticulum
|
||||||
for addressable hashes and other purposes. Non-configurable.
|
for addressable hashes and other purposes. Non-configurable.
|
||||||
|
@ -44,7 +44,7 @@ class Link:
|
|||||||
ECPUBSIZE = 32+32
|
ECPUBSIZE = 32+32
|
||||||
KEYSIZE = 32
|
KEYSIZE = 32
|
||||||
|
|
||||||
MDU = math.floor((RNS.Reticulum.MDU-RNS.Identity.AES_HMAC_OVERHEAD)/RNS.Identity.AES128_BLOCKSIZE)*RNS.Identity.AES128_BLOCKSIZE - 1
|
MDU = math.floor((RNS.Reticulum.MTU-RNS.Reticulum.HEADER_MINSIZE-RNS.Identity.FERNET_OVERHEAD)/RNS.Identity.AES128_BLOCKSIZE)*RNS.Identity.AES128_BLOCKSIZE - 1
|
||||||
|
|
||||||
# This value is set at a reasonable
|
# This value is set at a reasonable
|
||||||
# level for a 1 Kb/s channel.
|
# level for a 1 Kb/s channel.
|
||||||
@ -284,6 +284,7 @@ class Link:
|
|||||||
:param failed_callback: An optional function or method with the signature *failed_callback(request_receipt)* to be called when a request fails. See the :ref:`Request Example<example-request>` for more info.
|
:param failed_callback: An optional function or method with the signature *failed_callback(request_receipt)* to be called when a request fails. See the :ref:`Request Example<example-request>` for more info.
|
||||||
:param progress_callback: An optional function or method with the signature *progress_callback(request_receipt)* to be called when progress is made receiving the response. Progress can be accessed as a float between 0.0 and 1.0 by the *request_receipt.progress* property.
|
:param progress_callback: An optional function or method with the signature *progress_callback(request_receipt)* to be called when progress is made receiving the response. Progress can be accessed as a float between 0.0 and 1.0 by the *request_receipt.progress* property.
|
||||||
:param timeout: An optional timeout in seconds for the request. If *None* is supplied it will be calculated based on link RTT.
|
:param timeout: An optional timeout in seconds for the request. If *None* is supplied it will be calculated based on link RTT.
|
||||||
|
:returns: A :ref:`RNS.RequestReceipt<api-requestreceipt>` instance if the request was sent, or *False* if it was not.
|
||||||
"""
|
"""
|
||||||
request_path_hash = RNS.Identity.truncated_hash(path.encode("utf-8"))
|
request_path_hash = RNS.Identity.truncated_hash(path.encode("utf-8"))
|
||||||
unpacked_request = [time.time(), request_path_hash, data]
|
unpacked_request = [time.time(), request_path_hash, data]
|
||||||
@ -296,8 +297,10 @@ class Link:
|
|||||||
request_packet = RNS.Packet(self, packed_request, RNS.Packet.DATA, context = RNS.Packet.REQUEST)
|
request_packet = RNS.Packet(self, packed_request, RNS.Packet.DATA, context = RNS.Packet.REQUEST)
|
||||||
packet_receipt = request_packet.send()
|
packet_receipt = request_packet.send()
|
||||||
|
|
||||||
|
if packet_receipt == False:
|
||||||
|
return False
|
||||||
|
else:
|
||||||
packet_receipt.set_timeout(timeout)
|
packet_receipt.set_timeout(timeout)
|
||||||
|
|
||||||
return RequestReceipt(
|
return RequestReceipt(
|
||||||
self,
|
self,
|
||||||
packet_receipt = packet_receipt,
|
packet_receipt = packet_receipt,
|
||||||
|
@ -71,7 +71,7 @@ class Packet:
|
|||||||
# With an MTU of 500, the maximum of data we can
|
# With an MTU of 500, the maximum of data we can
|
||||||
# send in a single encrypted packet is given by
|
# send in a single encrypted packet is given by
|
||||||
# the below calculation; 383 bytes.
|
# the below calculation; 383 bytes.
|
||||||
ENCRYPTED_MDU = math.floor((RNS.Reticulum.MDU-RNS.Identity.AES_HMAC_OVERHEAD-RNS.Identity.KEYSIZE//16)/RNS.Identity.AES128_BLOCKSIZE)*RNS.Identity.AES128_BLOCKSIZE - 1
|
ENCRYPTED_MDU = math.floor((RNS.Reticulum.MDU-RNS.Identity.FERNET_OVERHEAD-RNS.Identity.KEYSIZE//16)/RNS.Identity.AES128_BLOCKSIZE)*RNS.Identity.AES128_BLOCKSIZE - 1
|
||||||
"""
|
"""
|
||||||
The maximum size of the payload data in a single encrypted packet
|
The maximum size of the payload data in a single encrypted packet
|
||||||
"""
|
"""
|
||||||
|
@ -781,9 +781,12 @@ class Resource:
|
|||||||
|
|
||||||
|
|
||||||
class ResourceAdvertisement:
|
class ResourceAdvertisement:
|
||||||
HASHMAP_MAX_LEN = 70
|
OVERHEAD = 128
|
||||||
|
HASHMAP_MAX_LEN = math.floor((RNS.Link.MDU-OVERHEAD)/Resource.MAPHASH_LEN)
|
||||||
COLLISION_GUARD_SIZE = 2*Resource.WINDOW_MAX+HASHMAP_MAX_LEN
|
COLLISION_GUARD_SIZE = 2*Resource.WINDOW_MAX+HASHMAP_MAX_LEN
|
||||||
|
|
||||||
|
assert HASHMAP_MAX_LEN > 0, "The configured MTU is too small to include any map hashes in resource advertisments"
|
||||||
|
|
||||||
@staticmethod
|
@staticmethod
|
||||||
def is_request(advertisement_packet):
|
def is_request(advertisement_packet):
|
||||||
adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
|
adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
|
||||||
|
@ -36,15 +36,24 @@ class Reticulum:
|
|||||||
other programs to use on demand.
|
other programs to use on demand.
|
||||||
"""
|
"""
|
||||||
|
|
||||||
# The default RNS MTU is 500 bytes. This number has been chosen as
|
|
||||||
# a balance between compatibility with existing hardware devices
|
|
||||||
# on one hand, and the ability to use sufficiently high cryptographic
|
|
||||||
# key sizes on the other. In custom RNS network implementations, it
|
|
||||||
# is possible to raise this value, but doing so will completely break
|
|
||||||
# compatibility with all other RNS networks. An identical MTU is a
|
|
||||||
# prerequisite for peers to communicate in the same network.
|
|
||||||
MTU = 500
|
MTU = 500
|
||||||
HEADER_MAXSIZE = 23
|
"""
|
||||||
|
The MTU that Reticulum adheres to, and will expect other peers to
|
||||||
|
adhere to. By default, the MTU is 500 bytes. In custom RNS network
|
||||||
|
implementations, it is possible to change this value, but doing so will
|
||||||
|
completely break compatibility with all other RNS networks. An identical
|
||||||
|
MTU is a prerequisite for peers to communicate in the same network.
|
||||||
|
|
||||||
|
The absolute minimum MTU that Reticulum will function with is 215 bytes,
|
||||||
|
but bandwidth efficiency will be significantly impacted.
|
||||||
|
"""
|
||||||
|
|
||||||
|
# Length of truncated hashes in bits.
|
||||||
|
TRUNCATED_HASHLENGTH = 80
|
||||||
|
|
||||||
|
HEADER_MINSIZE = 2+1+(TRUNCATED_HASHLENGTH//8)*1
|
||||||
|
HEADER_MAXSIZE = 2+1+(TRUNCATED_HASHLENGTH//8)*2
|
||||||
|
|
||||||
MDU = MTU - HEADER_MAXSIZE
|
MDU = MTU - HEADER_MAXSIZE
|
||||||
|
|
||||||
router = None
|
router = None
|
||||||
|
Loading…
Reference in New Issue
Block a user