Data exchange over ethernet (mac2mac), how to implement?

Question

linux

Good day everyone. There is a task to write a program to transfer data between two hosts using the ethernet transfer protocol. The essence of the question is how the channel layer works in the language, in my case C, and what APIs are generally available for these purposes. For a long time I can not find anything on this topic on the Internet (both in Russian and in English), so I ask the question of a syudeman. Thank you all in advance.

Answer 1

Directly from the repository of the Linux author himself:
https://github.com/torvalds/linux/blob/master/net/...
By the way, there is a date in the comments, this code is 29 years old, and it is still relevant.
You can also look at this for an example:
https://github.com/iputils/iputils/blob/master/arping.c

and what are the general APIs for these purposes

Probably none.

Answer 2

API? To C? At the level of ethernet packets? Well, there are probably some libs that allow you to create packages, but if I were your teacher, I would add the condition "and without using libraries."
An RFC is taken, read, a packet is formed manually and manually sent to the network stack at the desired level.