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pytcp/protocols/ether/phrx.py 86c8b85f15a7c054c99f8d0d879e1513c6778f17 (86c8b85f) Text, 3.90 KB
#!/usr/bin/env python3
############################################################################
# #
# PyTCP - Python TCP/IP stack #
# Copyright (C) 2020-present Sebastian Majewski #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# Author's email: ccie18643@gmail.com #
# Github repository: https://github.com/ccie18643/PyTCP #
# #
############################################################################
#
# protocols/ether/phrx.py - packet handler for inbound Ethernet packets
#
# ver 2.7
#
from __future__ import annotations
from typing import TYPE_CHECKING
import pytcp.config as config
from pytcp.lib.logger import log
from pytcp.protocols.ether.fpp import EtherParser
from pytcp.protocols.ether.ps import (
ETHER_TYPE_ARP,
ETHER_TYPE_IP4,
ETHER_TYPE_IP6,
)
if TYPE_CHECKING:
from pytcp.misc.packet import PacketRx
from pytcp.subsystems.packet_handler import PacketHandler
def _phrx_ether(self: PacketHandler, packet_rx: PacketRx) -> None:
"""
Handle inbound Ethernet packets.
"""
self.packet_stats_rx.ether__pre_parse += 1
EtherParser(packet_rx)
if packet_rx.parse_failed:
self.packet_stats_rx.ether__failed_parse__drop += 1
if __debug__:
log(
"ether",
f"{packet_rx.tracker} - <CRIT>{packet_rx.parse_failed}</>",
)
return
if __debug__:
log("ether", f"{packet_rx.tracker} - {packet_rx.ether}")
# Check if received packet matches any of stack MAC addresses
if packet_rx.ether.dst not in {
self.mac_unicast,
*self.mac_multicast,
self.mac_broadcast,
}:
self.packet_stats_rx.ether__dst_unknown__drop += 1
if __debug__:
log(
"ether",
f"{packet_rx.tracker} - Ethernet packet not destined for this "
"stack, dropping",
)
return
if packet_rx.ether.dst == self.mac_unicast:
self.packet_stats_rx.ether__dst_unicast += 1
if packet_rx.ether.dst in self.mac_multicast:
self.packet_stats_rx.ether__dst_multicast += 1
if packet_rx.ether.dst == self.mac_broadcast:
self.packet_stats_rx.ether__dst_broadcast += 1
if packet_rx.ether.type == ETHER_TYPE_ARP and config.IP4_SUPPORT:
self._phrx_arp(packet_rx)
return
if packet_rx.ether.type == ETHER_TYPE_IP4 and config.IP4_SUPPORT:
self._phrx_ip4(packet_rx)
return
if packet_rx.ether.type == ETHER_TYPE_IP6 and config.IP6_SUPPORT:
self._phrx_ip6(packet_rx)
return
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