128 lines
2.4 KiB
C
128 lines
2.4 KiB
C
/* Copyright (c) 2016 PLUMgrid
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/bpf.h>
|
|
#include <linux/if_link.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <libgen.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include "bpf_load.h"
|
|
#include "bpf_util.h"
|
|
#include "libbpf.h"
|
|
|
|
static int ifindex;
|
|
static __u32 xdp_flags;
|
|
|
|
static void int_exit(int sig)
|
|
{
|
|
bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
|
|
exit(0);
|
|
}
|
|
|
|
/* simple per-protocol drop counter
|
|
*/
|
|
static void poll_stats(int interval)
|
|
{
|
|
unsigned int nr_cpus = bpf_num_possible_cpus();
|
|
const unsigned int nr_keys = 256;
|
|
__u64 values[nr_cpus], prev[nr_keys][nr_cpus];
|
|
__u32 key;
|
|
int i;
|
|
|
|
memset(prev, 0, sizeof(prev));
|
|
|
|
while (1) {
|
|
sleep(interval);
|
|
|
|
for (key = 0; key < nr_keys; key++) {
|
|
__u64 sum = 0;
|
|
|
|
assert(bpf_map_lookup_elem(map_fd[0], &key, values) == 0);
|
|
for (i = 0; i < nr_cpus; i++)
|
|
sum += (values[i] - prev[key][i]);
|
|
if (sum)
|
|
printf("proto %u: %10llu pkt/s\n",
|
|
key, sum / interval);
|
|
memcpy(prev[key], values, sizeof(values));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void usage(const char *prog)
|
|
{
|
|
fprintf(stderr,
|
|
"usage: %s [OPTS] IFINDEX\n\n"
|
|
"OPTS:\n"
|
|
" -S use skb-mode\n"
|
|
" -N enforce native mode\n",
|
|
prog);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
|
|
const char *optstr = "SN";
|
|
char filename[256];
|
|
int opt;
|
|
|
|
while ((opt = getopt(argc, argv, optstr)) != -1) {
|
|
switch (opt) {
|
|
case 'S':
|
|
xdp_flags |= XDP_FLAGS_SKB_MODE;
|
|
break;
|
|
case 'N':
|
|
xdp_flags |= XDP_FLAGS_DRV_MODE;
|
|
break;
|
|
default:
|
|
usage(basename(argv[0]));
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (optind == argc) {
|
|
usage(basename(argv[0]));
|
|
return 1;
|
|
}
|
|
|
|
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
|
|
perror("setrlimit(RLIMIT_MEMLOCK)");
|
|
return 1;
|
|
}
|
|
|
|
ifindex = strtoul(argv[optind], NULL, 0);
|
|
|
|
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
|
|
|
if (load_bpf_file(filename)) {
|
|
printf("%s", bpf_log_buf);
|
|
return 1;
|
|
}
|
|
|
|
if (!prog_fd[0]) {
|
|
printf("load_bpf_file: %s\n", strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
signal(SIGINT, int_exit);
|
|
signal(SIGTERM, int_exit);
|
|
|
|
if (bpf_set_link_xdp_fd(ifindex, prog_fd[0], xdp_flags) < 0) {
|
|
printf("link set xdp fd failed\n");
|
|
return 1;
|
|
}
|
|
|
|
poll_stats(2);
|
|
|
|
return 0;
|
|
}
|