It only implements IPv4 which explains to a degree that why IPv6 isn't ubiquitous: it's costly to implement.

passt (the network stack that you might be using if you're running qemu, or podman containers) also has no dynamic memory allocations. I always thought it's quite an interesting achievement. https://blog.vmsplice.net/2021/10/a-new-approach-to-usermode... https://passt.top/passt/about/#security

It would be interesting to know why you would choose this over something like the Contiki uIP or lwIP that everything seems to use.