LXR linux/tools/testing/selftests/bpf/progs/test_skb

   1// SPDX-License-Identifier: GPL-2.0
   2
   3#include <linux/bpf.h>
   4#include <bpf/bpf_helpers.h>
   5
   6int _version SEC("version") = 1;
   7char _license[] SEC("license") = "GPL";
   8
   9SEC("skb_ctx")
  10int process(struct __sk_buff *skb)
  11{
  12        #pragma clang loop unroll(full)
  13        for (int i = 0; i < 5; i++) {
  14                if (skb->cb[i] != i + 1)
  15                        return 1;
  16                skb->cb[i]++;
  17        }
  18        skb->priority++;
  19        skb->tstamp++;
  20        skb->mark++;
  21
  22        if (skb->wire_len != 100)
  23                return 1;
  24        if (skb->gso_segs != 8)
  25                return 1;
  26        if (skb->gso_size != 10)
  27                return 1;
  28
  29        return 0;
  30}
  31