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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connect6_prog.c (2472B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (c) 2018 Facebook
      3
      4#include <string.h>
      5
      6#include <linux/stddef.h>
      7#include <linux/bpf.h>
      8#include <linux/in.h>
      9#include <linux/in6.h>
     10#include <sys/socket.h>
     11
     12#include <bpf/bpf_helpers.h>
     13#include <bpf/bpf_endian.h>
     14
     15#define SRC_REWRITE_IP6_0	0
     16#define SRC_REWRITE_IP6_1	0
     17#define SRC_REWRITE_IP6_2	0
     18#define SRC_REWRITE_IP6_3	6
     19
     20#define DST_REWRITE_IP6_0	0
     21#define DST_REWRITE_IP6_1	0
     22#define DST_REWRITE_IP6_2	0
     23#define DST_REWRITE_IP6_3	1
     24
     25#define DST_REWRITE_PORT6	6666
     26
     27SEC("cgroup/connect6")
     28int connect_v6_prog(struct bpf_sock_addr *ctx)
     29{
     30	struct bpf_sock_tuple tuple = {};
     31	struct sockaddr_in6 sa;
     32	struct bpf_sock *sk;
     33
     34	/* Verify that new destination is available. */
     35	memset(&tuple.ipv6.saddr, 0, sizeof(tuple.ipv6.saddr));
     36	memset(&tuple.ipv6.sport, 0, sizeof(tuple.ipv6.sport));
     37
     38	tuple.ipv6.daddr[0] = bpf_htonl(DST_REWRITE_IP6_0);
     39	tuple.ipv6.daddr[1] = bpf_htonl(DST_REWRITE_IP6_1);
     40	tuple.ipv6.daddr[2] = bpf_htonl(DST_REWRITE_IP6_2);
     41	tuple.ipv6.daddr[3] = bpf_htonl(DST_REWRITE_IP6_3);
     42
     43	tuple.ipv6.dport = bpf_htons(DST_REWRITE_PORT6);
     44
     45	if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
     46		return 0;
     47	else if (ctx->type == SOCK_STREAM)
     48		sk = bpf_sk_lookup_tcp(ctx, &tuple, sizeof(tuple.ipv6),
     49				       BPF_F_CURRENT_NETNS, 0);
     50	else
     51		sk = bpf_sk_lookup_udp(ctx, &tuple, sizeof(tuple.ipv6),
     52				       BPF_F_CURRENT_NETNS, 0);
     53
     54	if (!sk)
     55		return 0;
     56
     57	if (sk->src_ip6[0] != tuple.ipv6.daddr[0] ||
     58	    sk->src_ip6[1] != tuple.ipv6.daddr[1] ||
     59	    sk->src_ip6[2] != tuple.ipv6.daddr[2] ||
     60	    sk->src_ip6[3] != tuple.ipv6.daddr[3] ||
     61	    sk->src_port != DST_REWRITE_PORT6) {
     62		bpf_sk_release(sk);
     63		return 0;
     64	}
     65
     66	bpf_sk_release(sk);
     67
     68	/* Rewrite destination. */
     69	ctx->user_ip6[0] = bpf_htonl(DST_REWRITE_IP6_0);
     70	ctx->user_ip6[1] = bpf_htonl(DST_REWRITE_IP6_1);
     71	ctx->user_ip6[2] = bpf_htonl(DST_REWRITE_IP6_2);
     72	ctx->user_ip6[3] = bpf_htonl(DST_REWRITE_IP6_3);
     73
     74	ctx->user_port = bpf_htons(DST_REWRITE_PORT6);
     75
     76	/* Rewrite source. */
     77	memset(&sa, 0, sizeof(sa));
     78
     79	sa.sin6_family = AF_INET6;
     80	sa.sin6_port = bpf_htons(0);
     81
     82	sa.sin6_addr.s6_addr32[0] = bpf_htonl(SRC_REWRITE_IP6_0);
     83	sa.sin6_addr.s6_addr32[1] = bpf_htonl(SRC_REWRITE_IP6_1);
     84	sa.sin6_addr.s6_addr32[2] = bpf_htonl(SRC_REWRITE_IP6_2);
     85	sa.sin6_addr.s6_addr32[3] = bpf_htonl(SRC_REWRITE_IP6_3);
     86
     87	if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
     88		return 0;
     89
     90	return 1;
     91}
     92
     93char _license[] SEC("license") = "GPL";