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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tailcall_bpf2bpf3.c (1058B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/bpf.h>
      3#include <bpf/bpf_helpers.h>
      4#include "bpf_legacy.h"
      5
      6struct {
      7	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
      8	__uint(max_entries, 2);
      9	__uint(key_size, sizeof(__u32));
     10	__uint(value_size, sizeof(__u32));
     11} jmp_table SEC(".maps");
     12
     13__noinline
     14int subprog_tail2(struct __sk_buff *skb)
     15{
     16	volatile char arr[64] = {};
     17
     18	if (load_word(skb, 0) || load_half(skb, 0))
     19		bpf_tail_call_static(skb, &jmp_table, 10);
     20	else
     21		bpf_tail_call_static(skb, &jmp_table, 1);
     22
     23	return skb->len;
     24}
     25
     26static __noinline
     27int subprog_tail(struct __sk_buff *skb)
     28{
     29	volatile char arr[64] = {};
     30
     31	bpf_tail_call_static(skb, &jmp_table, 0);
     32
     33	return skb->len * 2;
     34}
     35
     36SEC("tc")
     37int classifier_0(struct __sk_buff *skb)
     38{
     39	volatile char arr[128] = {};
     40
     41	return subprog_tail2(skb);
     42}
     43
     44SEC("tc")
     45int classifier_1(struct __sk_buff *skb)
     46{
     47	volatile char arr[128] = {};
     48
     49	return skb->len * 3;
     50}
     51
     52SEC("tc")
     53int entry(struct __sk_buff *skb)
     54{
     55	volatile char arr[128] = {};
     56
     57	return subprog_tail(skb);
     58}
     59
     60char __license[] SEC("license") = "GPL";