History

Tony Garnock-Jones 62f8385b24 Remove unused definition		5 years ago
..
incremental-highlevel	Remove unused definition	5 years ago
monolithic-lowlevel	Adjust demo-config.rkt to cope with full domain names	6 years ago
.gitignore	Move into subfolder in prep for merge	7 years ago
README.md	Clean up netstack README and TODO situation.	7 years ago
TODO.md	Clean up netstack README and TODO situation.	7 years ago

README.md

TCP/IP Stack

There are two (closely-related) implementations here:

monolithic-lowlevel is the original implementation, originally written for minimart, a language that followed our ESOP 2014 paper quite closely. Porting it to a monolithic-assertion-set Syndicate dialect helped substantially simplify the code.
incremental-highlevel is a port of monolithic-lowlevel to the Syndicate high-level DSL ("syndicate/actor"). Moving from the low-level Syndicate style to the high-level style also drastically simplified the code.

Linux Firewall Configuration

Imagine a setup where the machine you are running this code has IP 192.168.1.10. This code claims 192.168.1.222 for itself. Now, pinging 192.168.1.222 from some other machine, say 192.168.1.99, will cause the local kernel to receive the pings and then forward them on to 192.168.1.222, which because of the gratuitous ARP announcement, it knows to be on its own Ethernet MAC address. This causes the ping requests to repeat endlessly, each time with one lower TTL.

One approach to solving the problem is to prevent the kernel from forwarding packets addressed to 192.168.1.222. To do this,

sudo iptables -I FORWARD -d 192.168.1.222 -j DROP