WIP: Add IPv4 GNRC

[wysman]

Hi,

Why we do that :

• We create IoT object for old networks which are IPv4 only
• We want to be able to expose the shell over IPv4 TCP (ie. telnet)
• We want to be able to serve static web site over IPv4 Ethernet

We have start working on a IPv4 GNRC for RIOT, and we want to share the code early to open discussion about the implementation.

Test platform :

• Any board with a supported Ethernet PHY
• We works with the esp32-olimex-evb

Test application

• examples/gnrc_minimal_ipv4
• The shell command: sc_gnrc_icmpv4_echo

The current state :

• We can send and receive IPv4 frame
• We can send and receive ARP requests
• We can send and receive ICMP requests
• We answer to ICMP requests
• We can set IP / Netmask / Gateway / Routes
• We have limit to 2 ip address, and 8 routes, these limits can be overwrite

Work in progress

• We start a example for UDP Client/Server, the code need to be cleanup to support both IPv4 and IPv6 stack in the same time
• TCP
• Cleanup code + uncrustify
• Add doxygen documentation

[miri64]

Thanks for this great effort! I didn't have time to look into the code in detail, but from what I can tell already it might make sense to split this up into several PRs to stream-line the review process, e.g.

• ARP + IPv4 + a minimalistic example (not like gnrc_minimal, where the focus is to be as small as possible footprint-wise, but where a minimal feature set is provided),
• ICMP,
• the WIP rest

BTW regarding WIP:

* TCP

We do support TCP already in GNRC.

[wysman]

Actually, we are not working actively on this feature but we want to rework on it to be able to integrate it in RIOT for our future project.

My co-worker just tell me he have uncommitted code for the UDP section.

[aabadie]

@wysman are you still planning to work on IPv4 for GNRC ?

[wysman]

@aabadie We are going to ZephyrOS for the next project, so our work on GNRC IPv4 will be stall for long time.
I don't have the time to split the pull request and handle all the murdock process, but i can work a day from UGE Nantes or INRIA Rennes to make some technical reviews.

[aabadie]

but i can work a day from UGE Nantes or INRIA Rennes to make some technical reviews.

Do you mean that we can start a review here and you will address the comments ? By the way, are you working at Inria ?

[aabadie]

@wysman, since this PR is filling an important hole in GNRC and got a lot of positive reactions, we would really appreciate if you could find some time to finalize it.