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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test_tc_peer.c (1307B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <stdint.h>
      3#include <stdbool.h>
      4
      5#include <linux/bpf.h>
      6#include <linux/stddef.h>
      7#include <linux/pkt_cls.h>
      8#include <linux/if_ether.h>
      9#include <linux/ip.h>
     10
     11#include <bpf/bpf_helpers.h>
     12
     13volatile const __u32 IFINDEX_SRC;
     14volatile const __u32 IFINDEX_DST;
     15
     16static const __u8 src_mac[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55};
     17static const __u8 dst_mac[] = {0x00, 0x22, 0x33, 0x44, 0x55, 0x66};
     18
     19SEC("tc")
     20int tc_chk(struct __sk_buff *skb)
     21{
     22	return TC_ACT_SHOT;
     23}
     24
     25SEC("tc")
     26int tc_dst(struct __sk_buff *skb)
     27{
     28	return bpf_redirect_peer(IFINDEX_SRC, 0);
     29}
     30
     31SEC("tc")
     32int tc_src(struct __sk_buff *skb)
     33{
     34	return bpf_redirect_peer(IFINDEX_DST, 0);
     35}
     36
     37SEC("tc")
     38int tc_dst_l3(struct __sk_buff *skb)
     39{
     40	return bpf_redirect(IFINDEX_SRC, 0);
     41}
     42
     43SEC("tc")
     44int tc_src_l3(struct __sk_buff *skb)
     45{
     46	__u16 proto = skb->protocol;
     47
     48	if (bpf_skb_change_head(skb, ETH_HLEN, 0) != 0)
     49		return TC_ACT_SHOT;
     50
     51	if (bpf_skb_store_bytes(skb, 0, &src_mac, ETH_ALEN, 0) != 0)
     52		return TC_ACT_SHOT;
     53
     54	if (bpf_skb_store_bytes(skb, ETH_ALEN, &dst_mac, ETH_ALEN, 0) != 0)
     55		return TC_ACT_SHOT;
     56
     57	if (bpf_skb_store_bytes(skb, ETH_ALEN + ETH_ALEN, &proto, sizeof(__u16), 0) != 0)
     58		return TC_ACT_SHOT;
     59
     60	return bpf_redirect_peer(IFINDEX_DST, 0);
     61}
     62
     63char __license[] SEC("license") = "GPL";