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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recvmsg4_prog.c (758B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#include <linux/stddef.h>
      4#include <linux/bpf.h>
      5#include <linux/in.h>
      6#include <sys/socket.h>
      7
      8#include <bpf/bpf_helpers.h>
      9#include <bpf/bpf_endian.h>
     10
     11#include <bpf_sockopt_helpers.h>
     12
     13#define SERV4_IP		0xc0a801feU /* 192.168.1.254 */
     14#define SERV4_PORT		4040
     15
     16SEC("cgroup/recvmsg4")
     17int recvmsg4_prog(struct bpf_sock_addr *ctx)
     18{
     19	struct bpf_sock *sk;
     20	__u32 user_ip4;
     21	__u16 user_port;
     22
     23	sk = ctx->sk;
     24	if (!sk)
     25		return 1;
     26
     27	if (sk->family != AF_INET)
     28		return 1;
     29
     30	if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
     31		return 1;
     32
     33	if (!get_set_sk_priority(ctx))
     34		return 1;
     35
     36	ctx->user_ip4 = bpf_htonl(SERV4_IP);
     37	ctx->user_port = bpf_htons(SERV4_PORT);
     38
     39	return 1;
     40}
     41
     42char _license[] SEC("license") = "GPL";