1 /* Copyright (c) 2016 PLUMgrid
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of version 2 of the GNU General Public
5 * License as published by the Free Software Foundation.
8 #include <linux/if_link.h>
17 #include <sys/resource.h>
22 #include "bpf/libbpf.h"
25 static __u32 xdp_flags;
27 static void int_exit(int sig)
29 bpf_set_link_xdp_fd(ifindex, -1, xdp_flags);
33 /* simple per-protocol drop counter
35 static void poll_stats(int map_fd, int interval)
37 unsigned int nr_cpus = bpf_num_possible_cpus();
38 __u64 values[nr_cpus], prev[UINT8_MAX] = { 0 };
42 __u32 key = UINT32_MAX;
46 while (bpf_map_get_next_key(map_fd, &key, &key) != -1) {
49 assert(bpf_map_lookup_elem(map_fd, &key, values) == 0);
50 for (i = 0; i < nr_cpus; i++)
53 printf("proto %u: %10llu pkt/s\n",
54 key, (sum - prev[key]) / interval);
60 static void usage(const char *prog)
63 "usage: %s [OPTS] IFACE\n\n"
66 " -N enforce native mode\n",
70 int main(int argc, char **argv)
72 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
73 struct bpf_prog_load_attr prog_load_attr = {
74 .prog_type = BPF_PROG_TYPE_XDP,
76 const char *optstr = "SN";
77 int prog_fd, map_fd, opt;
78 struct bpf_object *obj;
82 while ((opt = getopt(argc, argv, optstr)) != -1) {
85 xdp_flags |= XDP_FLAGS_SKB_MODE;
88 xdp_flags |= XDP_FLAGS_DRV_MODE;
91 usage(basename(argv[0]));
97 usage(basename(argv[0]));
101 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
102 perror("setrlimit(RLIMIT_MEMLOCK)");
106 ifindex = if_nametoindex(argv[1]);
108 perror("if_nametoindex");
112 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
113 prog_load_attr.file = filename;
115 if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
118 map = bpf_map__next(NULL, obj);
120 printf("finding a map in obj file failed\n");
123 map_fd = bpf_map__fd(map);
126 printf("load_bpf_file: %s\n", strerror(errno));
130 signal(SIGINT, int_exit);
131 signal(SIGTERM, int_exit);
133 if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) {
134 printf("link set xdp fd failed\n");
138 poll_stats(map_fd, 2);