//#include <bcc/proto.h>
#include <stdint.h>
#include <stddef.h>
#include <linux/bpf.h>

#include <linux/if_ether.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <linux/filter.h>

#include "bpf_helpers.h"

#define LINUX_VERSION_CODE 263682

int SEC("filter") hashfilter(struct __sk_buff *skb) {
    __u32 nhoff = BPF_LL_OFF + ETH_HLEN;

    skb->cb[0] = nhoff;
    switch (skb->protocol) {
        case __constant_htons(ETH_P_IP):
            return -1;
        case __constant_htons(ETH_P_IPV6):
            return 0;
        default:
#if 0
            {
                char fmt[] = "Got proto %u\n";
                bpf_trace_printk(fmt, sizeof(fmt), h_proto);
                break;
            }
#else
            break;
#endif
    }
    return -1;
}


char __license[] SEC("license") = "GPL";

uint32_t __version SEC("version") = LINUX_VERSION_CODE;