tools/testing/selftests/bpf/progs/test_skb_ctx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/bpf.h>
   4 #include <bpf/bpf_helpers.h>
   5
   6 int _version SEC("version") = 1;
   7 char _license[] SEC("license") = "GPL";
   8
   9 SEC("skb_ctx")
  10 int 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 }