cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tailcall6.c (650B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/bpf.h>
      3
      4#include <bpf/bpf_helpers.h>
      5
      6struct {
      7	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
      8	__uint(max_entries, 1);
      9	__uint(key_size, sizeof(__u32));
     10	__uint(value_size, sizeof(__u32));
     11} jmp_table SEC(".maps");
     12
     13int count, which;
     14
     15SEC("tc")
     16int classifier_0(struct __sk_buff *skb)
     17{
     18	count++;
     19	if (__builtin_constant_p(which))
     20		__bpf_unreachable();
     21	bpf_tail_call(skb, &jmp_table, which);
     22	return 1;
     23}
     24
     25SEC("tc")
     26int entry(struct __sk_buff *skb)
     27{
     28	if (__builtin_constant_p(which))
     29		__bpf_unreachable();
     30	bpf_tail_call(skb, &jmp_table, which);
     31	return 0;
     32}
     33
     34char __license[] SEC("license") = "GPL";