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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xdpsock_kern.c (593B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/bpf.h>
      3#include <bpf/bpf_helpers.h>
      4#include "xdpsock.h"
      5
      6/* This XDP program is only needed for the XDP_SHARED_UMEM mode.
      7 * If you do not use this mode, libbpf can supply an XDP program for you.
      8 */
      9
     10struct {
     11	__uint(type, BPF_MAP_TYPE_XSKMAP);
     12	__uint(max_entries, MAX_SOCKS);
     13	__uint(key_size, sizeof(int));
     14	__uint(value_size, sizeof(int));
     15} xsks_map SEC(".maps");
     16
     17static unsigned int rr;
     18
     19SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx)
     20{
     21	rr = (rr + 1) & (MAX_SOCKS - 1);
     22
     23	return bpf_redirect_map(&xsks_map, rr, XDP_DROP);
     24}