linux+c+tcp+ip模型,nstack是Linux用户空间的TCP / IP协议栈

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

make

Set up test environment:

sudo tools/testenv.sh start

tools/run.sh veth1

Execute ping inside test environment:

tools/ping_test.sh

Expected 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 stop

Licensing

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.

Reference