microps

microps is an implementation of a small TCP/IP protocol stack for learning.

Old master branch: https://github.com/pandax381/microps/tree/master
If you love the Go language: https://github.com/pandax381/lectcp
Porting to xv6: https://github.com/pandax381/xv6-net

Features

Abstraction Layer

Physical device abstraction
- Define structure for physical device abstraction (struct net_device)
- Support multiple link protocols and physical devices
Logical interface abstraction
- Define structure for logical interface abstraction (struct net_iface)
- Support multiple address family and logical interfaces

Devices

Protocols

API

Socket like API

Logs

18:43:46.153 [I] net_protocol_register: registerd, type=ARP(0x0806) (net.c:223)
18:43:46.153 [I] net_timer_register: registerd: ARP Timer interval={1, 0} (net.c:257)
18:43:46.153 [I] net_protocol_register: registerd, type=IP(0x0800) (net.c:223)
18:43:46.153 [I] ip_protocol_register: registerd, type=ICMP(0x01) (ip.c:440)
18:43:46.153 [I] ip_protocol_register: registerd, type=UDP(0x11) (ip.c:440)
18:43:46.153 [I] ip_protocol_register: registerd, type=TCP(0x06) (ip.c:440)
18:43:46.153 [I] net_timer_register: registerd: TCP Timer interval={0, 100000} (net.c:257)
18:43:46.153 [I] net_device_register: registerd, dev=net0, type=0x0000 (net.c:74)
18:43:46.153 [D] null_init: initialized, dev=net0 (driver/null.c:46)
18:43:46.153 [I] net_device_register: registerd, dev=net1, type=0x0001 (net.c:74)
18:43:46.153 [D] loopback_init: initialized, dev=net1 (driver/loopback.c:49)
18:43:46.153 [I] ip_route_add: network=127.0.0.0, netmask=255.0.0.0, nexthop=0.0.0.0, iface=127.0.0.1 dev=net1 (ip.c:136)
18:43:46.153 [I] ip_iface_register: registerd: dev=net1, unicast=127.0.0.1, netmask=127.0.0.1, broadcast=255.0.0.0 (ip.c:233)
18:43:46.153 [I] net_device_register: registerd, dev=net2, type=0x0002 (net.c:74)
18:43:46.153 [D] ether_tap_init: ethernet device initialized, dev=net2 (driver/ether_tap_linux.c:174)
18:43:46.153 [I] ip_route_add: network=192.0.2.0, netmask=255.255.255.0, nexthop=0.0.0.0, iface=192.0.2.2 dev=net2 (ip.c:136)
18:43:46.153 [I] ip_iface_register: registerd: dev=net2, unicast=192.0.2.2, netmask=192.0.2.2, broadcast=255.255.255.0 (ip.c:233)
18:43:46.153 [I] ip_route_add: network=0.0.0.0, netmask=0.0.0.0, nexthop=192.0.2.1, iface=192.0.2.2 dev=net2 (ip.c:136)
18:43:46.153 [D] net_run: open all devices... (net.c:314)
18:43:46.153 [I] net_device_open: dev=net2, state=up (net.c:92)
18:43:46.153 [I] net_device_open: dev=net1, state=up (net.c:92)
18:43:46.153 [I] net_device_open: dev=net0, state=up (net.c:92)
18:43:46.153 [D] net_run: create background thread... (net.c:318)
18:43:46.154 [D] net_run: running... (net.c:324)
18:43:57.931 [D] ether_poll_helper: dev=net2, type=ARP(0x0806), len=42 (ether.c:127)
        src: 0e:4e:af:bc:64:c6
        dst: ff:ff:ff:ff:ff:ff
       type: 0x0806 (ARP)
18:43:57.931 [D] net_input_handler: queue pushed (num:1), dev=net2, type=ARP(0x0806), len=28 (net.c:191)
18:43:57.931 [D] net_thread: queue poped (num:0), dev=net2, type=ARP(0x0806), len=28 (net.c:286)
18:43:57.931 [D] arp_input: dev=net2, opcode=Request(0x0001), len=28 (arp.c:239)
        hrd: 0x0001
        pro: 0x0800
        hln: 6
        pln: 4
         op: 0x0001 (Request)
        sha: 0e:4e:af:bc:64:c6
        spa: 192.0.2.1
        tha: 00:00:00:00:00:00
        tpa: 192.0.2.2
18:43:57.931 [D] arp_cache_insert: INSERT: pa=192.0.2.1, ha=0e:4e:af:bc:64:c6 (arp.c:163)
18:43:57.931 [D] arp_reply: dev=net2, opcode=Reply(0x0002), len=28 (arp.c:213)
        hrd: 0x0001
        pro: 0x0800
        hln: 6
        pln: 4
         op: 0x0002 (Reply)
        sha: 00:00:5e:00:53:01
        spa: 192.0.2.2
        tha: 0e:4e:af:bc:64:c6
        tpa: 192.0.2.1
18:43:57.931 [D] net_device_output: dev=net2, type=ARP(0x0806), len=28 (net.c:156)
18:43:57.931 [D] ether_transmit_helper: dev=net2, type=ARP(0x0806), len=60 (ether.c:101)
        src: 00:00:5e:00:53:01
        dst: 0e:4e:af:bc:64:c6
       type: 0x0806 (ARP)
18:43:57.931 [D] ether_poll_helper: dev=net2, type=IP(0x0800), len=98 (ether.c:127)
        src: 0e:4e:af:bc:64:c6
        dst: 00:00:5e:00:53:01
       type: 0x0800 (IP)
18:43:57.931 [D] net_input_handler: queue pushed (num:1), dev=net2, type=IP(0x0800), len=84 (net.c:191)
18:43:57.932 [D] net_thread: queue poped (num:0), dev=net2, type=IP(0x0800), len=84 (net.c:286)
18:43:57.932 [D] ip_input: dev=net2, iface=192.0.2.2, protocol=ICMP(0x01), len=84 (ip.c:303)
        vhl: 0x45 [v: 4, hl: 5 (20)]
        tos: 0x00
      total: 84 (payload: 64)
         id: 41026
     offset: 0x4000 [flags=2, offset=0]
        ttl: 64
   protocol: 1 (ICMP)
        sum: 0x1663 (0x1663)
        src: 192.0.2.1
        dst: 192.0.2.2
18:43:57.932 [D] icmp_input: 192.0.2.1 => 192.0.2.2, type=Echo(8), len=64, iface=192.0.2.2 (icmp.c:100)
       type: 8 (Echo)
       code: 0
        sum: 0xb692 (0xb692)
         id: 55
        seq: 1
18:43:57.932 [D] icmp_output: 192.0.2.2 => 192.0.2.1, type=EchoReply(0), len=64 (icmp.c:138)
       type: 0 (EchoReply)
       code: 0
        sum: 0xbe92 (0xbe92)
         id: 55
        seq: 1
18:43:57.932 [D] ip_output_core: dev=net2, iface=192.0.2.1, protocol=ICMP(0x01), len=84 (ip.c:357)
        vhl: 0x45 [v: 4, hl: 5 (20)]
        tos: 0x00
      total: 84 (payload: 64)
         id: 128
     offset: 0x0000 [flags=0, offset=0]
        ttl: 255
   protocol: 1 (ICMP)
        sum: 0x3725 (0x3725)
        src: 192.0.2.2
        dst: 192.0.2.1
18:43:57.932 [D] arp_resolve: resolved, pa=192.0.2.1, ha=0e:4e:af:bc:64:c6 (arp.c:301)
18:43:57.932 [D] net_device_output: dev=net2, type=IP(0x0800), len=84 (net.c:156)
18:43:57.932 [D] ether_transmit_helper: dev=net2, type=IP(0x0800), len=98 (ether.c:101)
        src: 00:00:5e:00:53:01
        dst: 0e:4e:af:bc:64:c6
       type: 0x0800 (IP)
^C18:44:01.605 [D] net_shutdown: terminate background thread... (net.c:334)
18:44:01.606 [D] net_shutdown: close all devices... (net.c:341)
18:44:01.606 [I] net_device_close: dev=net2, state=down (net.c:110)
18:44:01.606 [I] net_device_close: dev=net1, state=down (net.c:110)
18:44:01.606 [I] net_device_close: dev=net0, state=down (net.c:110)
18:44:01.606 [D] net_shutdown: shutdown (net.c:345)

Tutorial

Build

$ git clone [email protected]:pandax381/microps.git
$ cd microps
$ make

Prepare Tap device

$ sudo ip tuntap add mode tap user $USER name tap0
$ sudo ip addr add 192.0.2.1/24 dev tap0
$ sudo ip link set tap0 up

It is temporary and will disappear after reboot.

Run sample application

$ ./app/tcps.exe 7
11:48:55.884 [I] net_protocol_register: registerd, type=ARP(0x0806) (net.c:223)
11:48:55.884 [I] net_timer_register: registerd: ARP Timer interval={1, 0} (net.c:257)
11:48:55.884 [I] net_protocol_register: registerd, type=IP(0x0800) (net.c:223)
...
11:48:55.884 [D] net_run: running... (net.c:324)
11:48:55.884 [D] tcp_bind: success: addr=0.0.0.0, port=7 (tcp.c:1156)

TCP Echo Server start on port 7. (default address is 192.0.2.2/24)

Test (Operate in another terminal)

Ping

$ ping 192.0.2.2
PING 192.0.2.2 (192.0.2.2) 56(84) bytes of data.
64 bytes from 192.0.2.2: icmp_seq=1 ttl=255 time=0.660 ms
64 bytes from 192.0.2.2: icmp_seq=2 ttl=255 time=0.688 ms
64 bytes from 192.0.2.2: icmp_seq=3 ttl=255 time=0.574 ms
...

TCP communication

$ nc 192.0.2.2 7
foo
foo
bar
bar

Sending text will be sent back by the Echo Server.

License

microps is under the MIT License: See LICENSE file.

Name		Name	Last commit message	Last commit date
Latest commit History 55 Commits
app		app
driver		driver
test		test
.gitignore		.gitignore
CONTRIBUTORS		CONTRIBUTORS
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
arp.c		arp.c
arp.h		arp.h
compile_flags.txt		compile_flags.txt
ether.c		ether.c
ether.h		ether.h
icmp.c		icmp.c
icmp.h		icmp.h
ip.c		ip.c
ip.h		ip.h
net.c		net.c
net.h		net.h
tcp.c		tcp.c
tcp.h		tcp.h
udp.c		udp.c
udp.h		udp.h
util.c		util.c
util.h		util.h

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