This is a project to develop an ebpf program that utilizes tc-bpf to strip the UDP Outer Header on ingress ipv4 udp flows if a geneve header is detected.

prereqs: Ubuntu 22.04 server

       sudo apt update

       sudo apt upgrade

       sudo reboot

       sudo apt install -y gcc clang libc6-dev-i386 libbpfcc-dev libbpf-dev linux-tools-common

       aws specific tools package - ```linux-tools-aws```

compile:

    clang -O2 -Wall -Wextra -target bpf -c -o geneve.o geneve.c

attach:

    sudo tc qdisc add dev <interface name>  clsact

    sudo tc filter add dev <interface name> ingress bpf da obj geneve.o sec sk_skb

detach:

    sudo tc qdisc del dev <interface name>  clsact

Example: Monitor ebpf trace messages

       sudo cat /sys/kernel/debug/tracing/trace_pipe
       
       <idle>-0       [001] d.s.. 69289.977151: bpf_trace_printk: prefix_len=0x18
       <idle>-0       [001] dNs.. 69289.977183: bpf_trace_printk: match on dest=ac10f000
       <idle>-0       [001] dNs.. 69289.977184: bpf_trace_printk: match on dest_port=5060
       <idle>-0       [001] dNs.. 69289.977184: bpf_trace_printk: match on tproxy_ip=7f000001
       <idle>-0       [001] dNs.. 69289.977185: bpf_trace_printk: forwarding_to_tproxy_port=58997
       <idle>-0       [001] dNs.. 69289.977187: bpf_trace_printk: Assigned

Important Note

The release workflow that creates the release binary and uploads it to the release folder will only be triggered when the state of PR changes to ready for review!.