#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>

SEC("sk_skb1")
int bpf_prog1(struct __sk_buff *skb)
{
        void *data_end = (void *)(long) skb->data_end;
        void *data = (void *)(long) skb->data;
        __u8 *d = data;
        int err;

        if (data + 10 > data_end) {
                err = bpf_skb_pull_data(skb, 10);
                if (err)
                        return SK_DROP;

                data_end = (void *)(long)skb->data_end;
                data = (void *)(long)skb->data;
                if (data + 10 > data_end)
                        return SK_DROP;
        }

        /* This write/read is a bit pointless but tests the verifier and
         * strparser handler for read/write pkt data and access into sk
         * fields.
         */
        d = data;
        d[7] = 1;
        return skb->len;
}

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