load.sh

#!/bin/bash
set -x
set -e

# Mount bpf filesystem
sudo mount -t bpf bpf /sys/fs/bpf/

# Compile the bpf_sockops program
clang -O2 -g  -Wall -target bpf  -c bpf_sockops.c -o bpf_sockops.o

# Load the bpf_sockops program
sudo bpftool prog load bpf_sockops.o "/sys/fs/bpf/bpf_sockop"
sudo bpftool cgroup attach "/sys/fs/cgroup/unified/" sock_ops pinned "/sys/fs/bpf/bpf_sockop"

MAP_ID=$(sudo bpftool prog show pinned "/sys/fs/bpf/bpf_sockop" | grep -o -E 'map_ids [0-9]+' | awk '{print $2}')
sudo bpftool map pin id $MAP_ID "/sys/fs/bpf/sock_ops_map"

# Load the bpf_redir program
if [ -z $1 ]
then
   clang -O2 -g  -Wall -target bpf  -c bpf_redir.c -o bpf_redir.o
   sudo bpftool prog load bpf_redir.o "/sys/fs/bpf/bpf_redir" map name sock_ops_map pinned "/sys/fs/bpf/sock_ops_map"
   sudo bpftool prog attach pinned "/sys/fs/bpf/bpf_redir" msg_verdict pinned "/sys/fs/bpf/sock_ops_map"
fi