Import Exception for scapy.layers.l2 on MacOS #4787
Description
Brief description
I used scapy lightly on my macbook then i started getting an error on import for scapy.layers.l2. tried recreating the venv, but it seems the problem persists across venvs
Scapy version
2.6.1
Python version
3.13.5
Operating system
MacOS M3 Sequoia 15.5
Additional environment information
I was running thousands of ARP lookups before this started happening.
requests similar to this:
arp_request = ARP(pdst='0.0.0.0')
broadcast = Ether(dst="ff:ff:ff:ff:ff:ff")
packet = broadcast / arp_request
srp(packet, timeout=0, verbose=False)How to reproduce
Get a macbook (mine is M3)
Join a local network with a large subnet, with a mask <20 ( over 4096 possible IPs )
run: import scapy.layers.l2
Actual result
>>> from scapy.all import ARP, Ether, srp
Traceback (most recent call last):
File "<python-input-1>", line 1, in <module>
from scapy.all import ARP, Ether, srp
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/all.py", line 26, in <module>
from scapy.route import *
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/route.py", line 247, in <module>
conf.route = Route()
~~~~~^^
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/route.py", line 37, in __init__
self.resync()
~~~~~~~~~~~^^
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/route.py", line 47, in resync
self.routes = read_routes()
~~~~~~~~~~~^^
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/arch/bpf/pfroute.py", line 1011, in read_routes
resp = _sr1_bsdsysctl(mib)
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/arch/bpf/pfroute.py", line 988, in _sr1_bsdsysctl
return pfmsghdrs(bytes(oldp))
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/base_classes.py", line 481, in __call__
i.__init__(*args, **kargs)
~~~~~~~~~~^^^^^^^^^^^^^^^^
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/packet.py", line 186, in __init__
self.dissect(_pkt)
~~~~~~~~~~~~^^^^^^
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/packet.py", line 1082, in dissect
s = self.do_dissect(s)
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/packet.py", line 1020, in do_dissect
s, fval = f.getfield(self, s)
~~~~~~~~~~^^^^^^^^^
File "/Users/michaeldennis/Documents/GitHub/LANscape/.env/lib/python3.13/site-packages/scapy/fields.py", line 1836, in getfield
raise MaximumItemsCount(
...<3 lines>...
)
scapy.fields.MaximumItemsCount: Maximum amount of items reached in PacketListField: 4096 (defaults to conf.max_list_count)
NOTE: the instance where this is happening is not leveraging the conf.max_list_count, but rather overridden using an optional arg on class instantiation
Expected result
Not a failure on import