nstack
Overview
nstack is a Linux userspace TCP/IP stack. It was constructed to meet the following goals:
- Learn TCP/IP
- Learn Linux systems/network programming
- Learn Linux Socket API
Current features:
- One network interface and socket
- Ethernet frame handling
- ARP request/reply, simple caching
- ICMP pings and replies
- IPv4 packet handling, checksum
- TCPv4 Handshake
- TCP data transmission
Build and Test
makeSet up test environment:
sudo tools/testenv.sh start
tools/run.sh veth1Execute ping inside test environment:
tools/ping_test.shExpected nstack messages:
arp_gratuitous: Announce 10.0.0.2
nstack_ingress_thread: Waiting for rx
nstack_ingress_thread: Frame received!
ether_input: proto id: 0x800
ip_input: proto id: 0x1
icmp_input: ICMP type: 8
nstack_ingress_thread: tick
nstack_ingress_thread: Waiting for rx
nstack_ingress_thread: Frame received!
ether_input: proto id: 0x800
ip_input: proto id: 0x1
icmp_input: ICMP type: 8
Ending the test environment:
sudo tools/testenv.sh stopLicensing
nstack is freely redistributable under the two-clause BSD License.
Use of this source code is governed by a BSD-style license that can be found
in the LICENSE file.