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_tcpnotify_kern.c (2017B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <stddef.h>
      3#include <string.h>
      4#include <netinet/in.h>
      5#include <linux/bpf.h>
      6#include <linux/if_ether.h>
      7#include <linux/if_packet.h>
      8#include <linux/ip.h>
      9#include <linux/ipv6.h>
     10#include <linux/types.h>
     11#include <linux/socket.h>
     12#include <linux/tcp.h>
     13#include <bpf/bpf_helpers.h>
     14#include <bpf/bpf_endian.h>
     15#include "test_tcpnotify.h"
     16
     17struct {
     18	__uint(type, BPF_MAP_TYPE_ARRAY);
     19	__uint(max_entries, 4);
     20	__type(key, __u32);
     21	__type(value, struct tcpnotify_globals);
     22} global_map SEC(".maps");
     23
     24struct {
     25	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
     26	__uint(max_entries, 2);
     27	__type(key, int);
     28	__type(value, __u32);
     29} perf_event_map SEC(".maps");
     30
     31SEC("sockops")
     32int bpf_testcb(struct bpf_sock_ops *skops)
     33{
     34	int rv = -1;
     35	int op;
     36
     37	op = (int) skops->op;
     38
     39	if (bpf_ntohl(skops->remote_port) != TESTPORT) {
     40		skops->reply = -1;
     41		return 0;
     42	}
     43
     44	switch (op) {
     45	case BPF_SOCK_OPS_TIMEOUT_INIT:
     46	case BPF_SOCK_OPS_RWND_INIT:
     47	case BPF_SOCK_OPS_NEEDS_ECN:
     48	case BPF_SOCK_OPS_BASE_RTT:
     49	case BPF_SOCK_OPS_RTO_CB:
     50		rv = 1;
     51		break;
     52
     53	case BPF_SOCK_OPS_TCP_CONNECT_CB:
     54	case BPF_SOCK_OPS_TCP_LISTEN_CB:
     55	case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
     56	case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
     57		bpf_sock_ops_cb_flags_set(skops, (BPF_SOCK_OPS_RETRANS_CB_FLAG|
     58					  BPF_SOCK_OPS_RTO_CB_FLAG));
     59		rv = 1;
     60		break;
     61	case BPF_SOCK_OPS_RETRANS_CB: {
     62			__u32 key = 0;
     63			struct tcpnotify_globals g, *gp;
     64			struct tcp_notifier msg = {
     65				.type = 0xde,
     66				.subtype = 0xad,
     67				.source = 0xbe,
     68				.hash = 0xef,
     69			};
     70
     71			rv = 1;
     72
     73			/* Update results */
     74			gp = bpf_map_lookup_elem(&global_map, &key);
     75			if (!gp)
     76				break;
     77			g = *gp;
     78			g.total_retrans = skops->total_retrans;
     79			g.ncalls++;
     80			bpf_map_update_elem(&global_map, &key, &g,
     81					    BPF_ANY);
     82			bpf_perf_event_output(skops, &perf_event_map,
     83					      BPF_F_CURRENT_CPU,
     84					      &msg, sizeof(msg));
     85		}
     86		break;
     87	default:
     88		rv = -1;
     89	}
     90	skops->reply = rv;
     91	return 1;
     92}
     93char _license[] SEC("license") = "GPL";