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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tailcall5.c (662B)

      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, 3);
      9	__uint(key_size, sizeof(__u32));
     10	__uint(value_size, sizeof(__u32));
     11} jmp_table SEC(".maps");
     12
     13int selector = 0;
     14
     15#define TAIL_FUNC(x)				\
     16	SEC("tc")				\
     17	int classifier_##x(struct __sk_buff *skb)	\
     18	{					\
     19		return x;			\
     20	}
     21TAIL_FUNC(0)
     22TAIL_FUNC(1)
     23TAIL_FUNC(2)
     24
     25SEC("tc")
     26int entry(struct __sk_buff *skb)
     27{
     28	int idx = 0;
     29
     30	if (selector == 1234)
     31		idx = 1;
     32	else if (selector == 5678)
     33		idx = 2;
     34
     35	bpf_tail_call(skb, &jmp_table, idx);
     36	return 3;
     37}
     38
     39char __license[] SEC("license") = "GPL";