1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2016 PLUMgrid
5 #include <linux/if_link.h>
14 #include <sys/resource.h>
19 #include <bpf/libbpf.h>
22 static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
25 static void int_exit(int sig)
27 __u32 curr_prog_id = 0;
29 if (bpf_xdp_query_id(ifindex, xdp_flags, &curr_prog_id)) {
30 printf("bpf_xdp_query_id failed\n");
33 if (prog_id == curr_prog_id)
34 bpf_xdp_detach(ifindex, xdp_flags, NULL);
35 else if (!curr_prog_id)
36 printf("couldn't find a prog id on a given interface\n");
38 printf("program on interface changed, not removing\n");
42 /* simple per-protocol drop counter
44 static void poll_stats(int map_fd, int interval)
46 unsigned int nr_cpus = bpf_num_possible_cpus();
47 __u64 values[nr_cpus], prev[UINT8_MAX] = { 0 };
51 __u32 key = UINT32_MAX;
55 while (bpf_map_get_next_key(map_fd, &key, &key) != -1) {
58 assert(bpf_map_lookup_elem(map_fd, &key, values) == 0);
59 for (i = 0; i < nr_cpus; i++)
62 printf("proto %u: %10llu pkt/s\n",
63 key, (sum - prev[key]) / interval);
69 static void usage(const char *prog)
72 "usage: %s [OPTS] IFACE\n\n"
75 " -N enforce native mode\n"
76 " -F force loading prog\n",
80 int main(int argc, char **argv)
82 struct bpf_prog_info info = {};
83 __u32 info_len = sizeof(info);
84 const char *optstr = "FSN";
85 int prog_fd, map_fd, opt;
86 struct bpf_program *prog;
87 struct bpf_object *obj;
92 while ((opt = getopt(argc, argv, optstr)) != -1) {
95 xdp_flags |= XDP_FLAGS_SKB_MODE;
98 /* default, set below */
101 xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
104 usage(basename(argv[0]));
109 if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
110 xdp_flags |= XDP_FLAGS_DRV_MODE;
112 if (optind == argc) {
113 usage(basename(argv[0]));
117 ifindex = if_nametoindex(argv[optind]);
119 perror("if_nametoindex");
123 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
124 obj = bpf_object__open_file(filename, NULL);
125 if (libbpf_get_error(obj))
128 prog = bpf_object__next_program(obj, NULL);
129 bpf_program__set_type(prog, BPF_PROG_TYPE_XDP);
131 err = bpf_object__load(obj);
135 prog_fd = bpf_program__fd(prog);
137 map = bpf_object__next_map(obj, NULL);
139 printf("finding a map in obj file failed\n");
142 map_fd = bpf_map__fd(map);
145 printf("bpf_prog_load_xattr: %s\n", strerror(errno));
149 signal(SIGINT, int_exit);
150 signal(SIGTERM, int_exit);
152 if (bpf_xdp_attach(ifindex, prog_fd, xdp_flags, NULL) < 0) {
153 printf("link set xdp fd failed\n");
157 err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
159 printf("can't get prog info - %s\n", strerror(errno));
164 poll_stats(map_fd, 2);