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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psock_lib.h (3540B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright 2013 Google Inc.
      4 * Author: Willem de Bruijn <willemb@google.com>
      5 *         Daniel Borkmann <dborkman@redhat.com>
      6 */
      7
      8#ifndef PSOCK_LIB_H
      9#define PSOCK_LIB_H
     10
     11#include <sys/types.h>
     12#include <sys/socket.h>
     13#include <string.h>
     14#include <arpa/inet.h>
     15#include <unistd.h>
     16
     17#define DATA_LEN			100
     18#define DATA_CHAR			'a'
     19#define DATA_CHAR_1			'b'
     20
     21#define PORT_BASE			8000
     22
     23#ifndef __maybe_unused
     24# define __maybe_unused		__attribute__ ((__unused__))
     25#endif
     26
     27static __maybe_unused void pair_udp_setfilter(int fd)
     28{
     29	/* the filter below checks for all of the following conditions that
     30	 * are based on the contents of create_payload()
     31	 *  ether type 0x800 and
     32	 *  ip proto udp     and
     33	 *  skb->len == DATA_LEN and
     34	 *  udp[38] == 'a' or udp[38] == 'b'
     35	 * It can be generated from the following bpf_asm input:
     36	 *	ldh [12]
     37	 *	jne #0x800, drop	; ETH_P_IP
     38	 *	ldb [23]
     39	 *	jneq #17, drop		; IPPROTO_UDP
     40	 *	ld len			; ld skb->len
     41	 *	jlt #100, drop		; DATA_LEN
     42	 *	ldb [80]
     43	 *	jeq #97, pass		; DATA_CHAR
     44	 *	jne #98, drop		; DATA_CHAR_1
     45	 *	pass:
     46	 *	  ret #-1
     47	 *	drop:
     48	 *	  ret #0
     49	 */
     50	struct sock_filter bpf_filter[] = {
     51		{ 0x28,  0,  0, 0x0000000c },
     52		{ 0x15,  0,  8, 0x00000800 },
     53		{ 0x30,  0,  0, 0x00000017 },
     54		{ 0x15,  0,  6, 0x00000011 },
     55		{ 0x80,  0,  0, 0000000000 },
     56		{ 0x35,  0,  4, 0x00000064 },
     57		{ 0x30,  0,  0, 0x00000050 },
     58		{ 0x15,  1,  0, 0x00000061 },
     59		{ 0x15,  0,  1, 0x00000062 },
     60		{ 0x06,  0,  0, 0xffffffff },
     61		{ 0x06,  0,  0, 0000000000 },
     62	};
     63	struct sock_fprog bpf_prog;
     64
     65	bpf_prog.filter = bpf_filter;
     66	bpf_prog.len = sizeof(bpf_filter) / sizeof(struct sock_filter);
     67
     68	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf_prog,
     69		       sizeof(bpf_prog))) {
     70		perror("setsockopt SO_ATTACH_FILTER");
     71		exit(1);
     72	}
     73}
     74
     75static __maybe_unused void pair_udp_open(int fds[], uint16_t port)
     76{
     77	struct sockaddr_in saddr, daddr;
     78
     79	fds[0] = socket(PF_INET, SOCK_DGRAM, 0);
     80	fds[1] = socket(PF_INET, SOCK_DGRAM, 0);
     81	if (fds[0] == -1 || fds[1] == -1) {
     82		fprintf(stderr, "ERROR: socket dgram\n");
     83		exit(1);
     84	}
     85
     86	memset(&saddr, 0, sizeof(saddr));
     87	saddr.sin_family = AF_INET;
     88	saddr.sin_port = htons(port);
     89	saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
     90
     91	memset(&daddr, 0, sizeof(daddr));
     92	daddr.sin_family = AF_INET;
     93	daddr.sin_port = htons(port + 1);
     94	daddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
     95
     96	/* must bind both to get consistent hash result */
     97	if (bind(fds[1], (void *) &daddr, sizeof(daddr))) {
     98		perror("bind");
     99		exit(1);
    100	}
    101	if (bind(fds[0], (void *) &saddr, sizeof(saddr))) {
    102		perror("bind");
    103		exit(1);
    104	}
    105	if (connect(fds[0], (void *) &daddr, sizeof(daddr))) {
    106		perror("connect");
    107		exit(1);
    108	}
    109}
    110
    111static __maybe_unused void pair_udp_send_char(int fds[], int num, char payload)
    112{
    113	char buf[DATA_LEN], rbuf[DATA_LEN];
    114
    115	memset(buf, payload, sizeof(buf));
    116	while (num--) {
    117		/* Should really handle EINTR and EAGAIN */
    118		if (write(fds[0], buf, sizeof(buf)) != sizeof(buf)) {
    119			fprintf(stderr, "ERROR: send failed left=%d\n", num);
    120			exit(1);
    121		}
    122		if (read(fds[1], rbuf, sizeof(rbuf)) != sizeof(rbuf)) {
    123			fprintf(stderr, "ERROR: recv failed left=%d\n", num);
    124			exit(1);
    125		}
    126		if (memcmp(buf, rbuf, sizeof(buf))) {
    127			fprintf(stderr, "ERROR: data failed left=%d\n", num);
    128			exit(1);
    129		}
    130	}
    131}
    132
    133static __maybe_unused void pair_udp_send(int fds[], int num)
    134{
    135	return pair_udp_send_char(fds, num, DATA_CHAR);
    136}
    137
    138static __maybe_unused void pair_udp_close(int fds[])
    139{
    140	close(fds[0]);
    141	close(fds[1]);
    142}
    143
    144#endif /* PSOCK_LIB_H */