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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mptcp_sock.c (1888B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2020, Tessares SA. */
      3/* Copyright (c) 2022, SUSE. */
      4
      5#include <linux/bpf.h>
      6#include <bpf/bpf_helpers.h>
      7#include "bpf_tcp_helpers.h"
      8
      9char _license[] SEC("license") = "GPL";
     10__u32 token = 0;
     11
     12struct mptcp_storage {
     13	__u32 invoked;
     14	__u32 is_mptcp;
     15	struct sock *sk;
     16	__u32 token;
     17	struct sock *first;
     18	char ca_name[TCP_CA_NAME_MAX];
     19};
     20
     21struct {
     22	__uint(type, BPF_MAP_TYPE_SK_STORAGE);
     23	__uint(map_flags, BPF_F_NO_PREALLOC);
     24	__type(key, int);
     25	__type(value, struct mptcp_storage);
     26} socket_storage_map SEC(".maps");
     27
     28SEC("sockops")
     29int _sockops(struct bpf_sock_ops *ctx)
     30{
     31	struct mptcp_storage *storage;
     32	struct mptcp_sock *msk;
     33	int op = (int)ctx->op;
     34	struct tcp_sock *tsk;
     35	struct bpf_sock *sk;
     36	bool is_mptcp;
     37
     38	if (op != BPF_SOCK_OPS_TCP_CONNECT_CB)
     39		return 1;
     40
     41	sk = ctx->sk;
     42	if (!sk)
     43		return 1;
     44
     45	tsk = bpf_skc_to_tcp_sock(sk);
     46	if (!tsk)
     47		return 1;
     48
     49	is_mptcp = bpf_core_field_exists(tsk->is_mptcp) ? tsk->is_mptcp : 0;
     50	if (!is_mptcp) {
     51		storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
     52					     BPF_SK_STORAGE_GET_F_CREATE);
     53		if (!storage)
     54			return 1;
     55
     56		storage->token = 0;
     57		__builtin_memset(storage->ca_name, 0, TCP_CA_NAME_MAX);
     58		storage->first = NULL;
     59	} else {
     60		msk = bpf_skc_to_mptcp_sock(sk);
     61		if (!msk)
     62			return 1;
     63
     64		storage = bpf_sk_storage_get(&socket_storage_map, msk, 0,
     65					     BPF_SK_STORAGE_GET_F_CREATE);
     66		if (!storage)
     67			return 1;
     68
     69		storage->token = msk->token;
     70		__builtin_memcpy(storage->ca_name, msk->ca_name, TCP_CA_NAME_MAX);
     71		storage->first = msk->first;
     72	}
     73	storage->invoked++;
     74	storage->is_mptcp = is_mptcp;
     75	storage->sk = (struct sock *)sk;
     76
     77	return 1;
     78}
     79
     80SEC("fentry/mptcp_pm_new_connection")
     81int BPF_PROG(trace_mptcp_pm_new_connection, struct mptcp_sock *msk,
     82	     const struct sock *ssk, int server_side)
     83{
     84	if (!server_side)
     85		token = msk->token;
     86
     87	return 0;
     88}