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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xdp1_user.c (3430B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* Copyright (c) 2016 PLUMgrid
      3 */
      4#include <linux/bpf.h>
      5#include <linux/if_link.h>
      6#include <assert.h>
      7#include <errno.h>
      8#include <signal.h>
      9#include <stdio.h>
     10#include <stdlib.h>
     11#include <string.h>
     12#include <unistd.h>
     13#include <libgen.h>
     14#include <net/if.h>
     15
     16#include "bpf_util.h"
     17#include <bpf/bpf.h>
     18#include <bpf/libbpf.h>
     19
     20static int ifindex;
     21static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
     22static __u32 prog_id;
     23
     24static void int_exit(int sig)
     25{
     26	__u32 curr_prog_id = 0;
     27
     28	if (bpf_xdp_query_id(ifindex, xdp_flags, &curr_prog_id)) {
     29		printf("bpf_xdp_query_id failed\n");
     30		exit(1);
     31	}
     32	if (prog_id == curr_prog_id)
     33		bpf_xdp_detach(ifindex, xdp_flags, NULL);
     34	else if (!curr_prog_id)
     35		printf("couldn't find a prog id on a given interface\n");
     36	else
     37		printf("program on interface changed, not removing\n");
     38	exit(0);
     39}
     40
     41/* simple per-protocol drop counter
     42 */
     43static void poll_stats(int map_fd, int interval)
     44{
     45	unsigned int nr_cpus = bpf_num_possible_cpus();
     46	__u64 values[nr_cpus], prev[UINT8_MAX] = { 0 };
     47	int i;
     48
     49	while (1) {
     50		__u32 key = UINT32_MAX;
     51
     52		sleep(interval);
     53
     54		while (bpf_map_get_next_key(map_fd, &key, &key) != -1) {
     55			__u64 sum = 0;
     56
     57			assert(bpf_map_lookup_elem(map_fd, &key, values) == 0);
     58			for (i = 0; i < nr_cpus; i++)
     59				sum += values[i];
     60			if (sum > prev[key])
     61				printf("proto %u: %10llu pkt/s\n",
     62				       key, (sum - prev[key]) / interval);
     63			prev[key] = sum;
     64		}
     65	}
     66}
     67
     68static void usage(const char *prog)
     69{
     70	fprintf(stderr,
     71		"usage: %s [OPTS] IFACE\n\n"
     72		"OPTS:\n"
     73		"    -S    use skb-mode\n"
     74		"    -N    enforce native mode\n"
     75		"    -F    force loading prog\n",
     76		prog);
     77}
     78
     79int main(int argc, char **argv)
     80{
     81	struct bpf_prog_info info = {};
     82	__u32 info_len = sizeof(info);
     83	const char *optstr = "FSN";
     84	int prog_fd, map_fd, opt;
     85	struct bpf_program *prog;
     86	struct bpf_object *obj;
     87	struct bpf_map *map;
     88	char filename[256];
     89	int err;
     90
     91	while ((opt = getopt(argc, argv, optstr)) != -1) {
     92		switch (opt) {
     93		case 'S':
     94			xdp_flags |= XDP_FLAGS_SKB_MODE;
     95			break;
     96		case 'N':
     97			/* default, set below */
     98			break;
     99		case 'F':
    100			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
    101			break;
    102		default:
    103			usage(basename(argv[0]));
    104			return 1;
    105		}
    106	}
    107
    108	if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
    109		xdp_flags |= XDP_FLAGS_DRV_MODE;
    110
    111	if (optind == argc) {
    112		usage(basename(argv[0]));
    113		return 1;
    114	}
    115
    116	ifindex = if_nametoindex(argv[optind]);
    117	if (!ifindex) {
    118		perror("if_nametoindex");
    119		return 1;
    120	}
    121
    122	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
    123	obj = bpf_object__open_file(filename, NULL);
    124	if (libbpf_get_error(obj))
    125		return 1;
    126
    127	prog = bpf_object__next_program(obj, NULL);
    128	bpf_program__set_type(prog, BPF_PROG_TYPE_XDP);
    129
    130	err = bpf_object__load(obj);
    131	if (err)
    132		return 1;
    133
    134	prog_fd = bpf_program__fd(prog);
    135
    136	map = bpf_object__next_map(obj, NULL);
    137	if (!map) {
    138		printf("finding a map in obj file failed\n");
    139		return 1;
    140	}
    141	map_fd = bpf_map__fd(map);
    142
    143	if (!prog_fd) {
    144		printf("bpf_prog_load_xattr: %s\n", strerror(errno));
    145		return 1;
    146	}
    147
    148	signal(SIGINT, int_exit);
    149	signal(SIGTERM, int_exit);
    150
    151	if (bpf_xdp_attach(ifindex, prog_fd, xdp_flags, NULL) < 0) {
    152		printf("link set xdp fd failed\n");
    153		return 1;
    154	}
    155
    156	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
    157	if (err) {
    158		printf("can't get prog info - %s\n", strerror(errno));
    159		return err;
    160	}
    161	prog_id = info.id;
    162
    163	poll_stats(map_fd, 1);
    164
    165	return 0;
    166}