162 lines
3.3 KiB
C
162 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2016 PLUMgrid
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*/
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#include <linux/bpf.h>
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#include <linux/if_link.h>
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <libgen.h>
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#include <sys/resource.h>
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#include <net/if.h>
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#include "bpf_util.h"
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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static int ifindex;
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static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
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static __u32 prog_id;
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static void int_exit(int sig)
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{
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__u32 curr_prog_id = 0;
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if (bpf_get_link_xdp_id(ifindex, &curr_prog_id, xdp_flags)) {
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printf("bpf_get_link_xdp_id failed\n");
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exit(1);
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}
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if (prog_id == curr_prog_id)
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bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
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else if (!curr_prog_id)
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printf("couldn't find a prog id on a given interface\n");
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else
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printf("program on interface changed, not removing\n");
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exit(0);
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}
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/* simple per-protocol drop counter
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*/
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static void poll_stats(int map_fd, int interval)
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{
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unsigned int nr_cpus = bpf_num_possible_cpus();
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__u64 values[nr_cpus], prev[UINT8_MAX] = { 0 };
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int i;
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while (1) {
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__u32 key = UINT32_MAX;
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sleep(interval);
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while (bpf_map_get_next_key(map_fd, &key, &key) != -1) {
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__u64 sum = 0;
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assert(bpf_map_lookup_elem(map_fd, &key, values) == 0);
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for (i = 0; i < nr_cpus; i++)
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sum += values[i];
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if (sum > prev[key])
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printf("proto %u: %10llu pkt/s\n",
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key, (sum - prev[key]) / interval);
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prev[key] = sum;
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}
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}
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}
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static void usage(const char *prog)
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{
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fprintf(stderr,
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"usage: %s [OPTS] IFACE\n\n"
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"OPTS:\n"
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" -S use skb-mode\n"
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" -N enforce native mode\n"
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" -F force loading prog\n",
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prog);
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}
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int main(int argc, char **argv)
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{
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struct bpf_prog_load_attr prog_load_attr = {
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.prog_type = BPF_PROG_TYPE_XDP,
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};
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struct bpf_prog_info info = {};
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__u32 info_len = sizeof(info);
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const char *optstr = "FSN";
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int prog_fd, map_fd, opt;
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struct bpf_object *obj;
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struct bpf_map *map;
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char filename[256];
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int err;
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while ((opt = getopt(argc, argv, optstr)) != -1) {
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switch (opt) {
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case 'S':
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xdp_flags |= XDP_FLAGS_SKB_MODE;
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break;
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case 'N':
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/* default, set below */
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break;
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case 'F':
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xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
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break;
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default:
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usage(basename(argv[0]));
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return 1;
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}
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}
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if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
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xdp_flags |= XDP_FLAGS_DRV_MODE;
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if (optind == argc) {
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usage(basename(argv[0]));
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return 1;
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}
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ifindex = if_nametoindex(argv[optind]);
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if (!ifindex) {
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perror("if_nametoindex");
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return 1;
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}
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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prog_load_attr.file = filename;
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if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
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return 1;
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map = bpf_object__next_map(obj, NULL);
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if (!map) {
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printf("finding a map in obj file failed\n");
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return 1;
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}
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map_fd = bpf_map__fd(map);
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if (!prog_fd) {
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printf("bpf_prog_load_xattr: %s\n", strerror(errno));
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return 1;
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}
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signal(SIGINT, int_exit);
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signal(SIGTERM, int_exit);
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if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
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printf("link set xdp fd failed\n");
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return 1;
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}
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err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
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if (err) {
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printf("can't get prog info - %s\n", strerror(errno));
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return err;
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}
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prog_id = info.id;
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poll_stats(map_fd, 2);
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return 0;
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}
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