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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tcp_rtt.c (1212B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/bpf.h>
      3#include <bpf/bpf_helpers.h>
      4
      5char _license[] SEC("license") = "GPL";
      6
      7struct tcp_rtt_storage {
      8	__u32 invoked;
      9	__u32 dsack_dups;
     10	__u32 delivered;
     11	__u32 delivered_ce;
     12	__u32 icsk_retransmits;
     13};
     14
     15struct {
     16	__uint(type, BPF_MAP_TYPE_SK_STORAGE);
     17	__uint(map_flags, BPF_F_NO_PREALLOC);
     18	__type(key, int);
     19	__type(value, struct tcp_rtt_storage);
     20} socket_storage_map SEC(".maps");
     21
     22SEC("sockops")
     23int _sockops(struct bpf_sock_ops *ctx)
     24{
     25	struct tcp_rtt_storage *storage;
     26	struct bpf_tcp_sock *tcp_sk;
     27	int op = (int) ctx->op;
     28	struct bpf_sock *sk;
     29
     30	sk = ctx->sk;
     31	if (!sk)
     32		return 1;
     33
     34	storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
     35				     BPF_SK_STORAGE_GET_F_CREATE);
     36	if (!storage)
     37		return 1;
     38
     39	if (op == BPF_SOCK_OPS_TCP_CONNECT_CB) {
     40		bpf_sock_ops_cb_flags_set(ctx, BPF_SOCK_OPS_RTT_CB_FLAG);
     41		return 1;
     42	}
     43
     44	if (op != BPF_SOCK_OPS_RTT_CB)
     45		return 1;
     46
     47	tcp_sk = bpf_tcp_sock(sk);
     48	if (!tcp_sk)
     49		return 1;
     50
     51	storage->invoked++;
     52
     53	storage->dsack_dups = tcp_sk->dsack_dups;
     54	storage->delivered = tcp_sk->delivered;
     55	storage->delivered_ce = tcp_sk->delivered_ce;
     56	storage->icsk_retransmits = tcp_sk->icsk_retransmits;
     57
     58	return 1;
     59}