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86af8b41 BB |
1 | /* Copyright (c) 2016 PLUMgrid |
2 | * | |
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. | |
6 | */ | |
7 | #include <linux/bpf.h> | |
3993f2cb | 8 | #include <linux/if_link.h> |
86af8b41 BB |
9 | #include <assert.h> |
10 | #include <errno.h> | |
11 | #include <signal.h> | |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
86af8b41 | 15 | #include <unistd.h> |
3993f2cb | 16 | #include <libgen.h> |
6dfca831 | 17 | #include <sys/resource.h> |
e00c7b21 | 18 | |
e00c7b21 | 19 | #include "bpf_util.h" |
be5bca44 JK |
20 | #include "bpf/bpf.h" |
21 | #include "bpf/libbpf.h" | |
86af8b41 | 22 | |
86af8b41 | 23 | static int ifindex; |
6387d011 | 24 | static __u32 xdp_flags; |
86af8b41 BB |
25 | |
26 | static void int_exit(int sig) | |
27 | { | |
b259c2ff | 28 | bpf_set_link_xdp_fd(ifindex, -1, xdp_flags); |
86af8b41 BB |
29 | exit(0); |
30 | } | |
31 | ||
32 | /* simple per-protocol drop counter | |
33 | */ | |
be5bca44 | 34 | static void poll_stats(int map_fd, int interval) |
86af8b41 | 35 | { |
e00c7b21 | 36 | unsigned int nr_cpus = bpf_num_possible_cpus(); |
d606ee5c | 37 | __u64 values[nr_cpus], prev[UINT8_MAX] = { 0 }; |
86af8b41 BB |
38 | int i; |
39 | ||
86af8b41 | 40 | while (1) { |
d606ee5c MC |
41 | __u32 key = UINT32_MAX; |
42 | ||
86af8b41 BB |
43 | sleep(interval); |
44 | ||
d606ee5c | 45 | while (bpf_map_get_next_key(map_fd, &key, &key) != -1) { |
86af8b41 BB |
46 | __u64 sum = 0; |
47 | ||
be5bca44 | 48 | assert(bpf_map_lookup_elem(map_fd, &key, values) == 0); |
86af8b41 | 49 | for (i = 0; i < nr_cpus; i++) |
d606ee5c MC |
50 | sum += values[i]; |
51 | if (sum > prev[key]) | |
86af8b41 | 52 | printf("proto %u: %10llu pkt/s\n", |
d606ee5c MC |
53 | key, (sum - prev[key]) / interval); |
54 | prev[key] = sum; | |
86af8b41 BB |
55 | } |
56 | } | |
57 | } | |
58 | ||
3993f2cb | 59 | static void usage(const char *prog) |
86af8b41 | 60 | { |
3993f2cb DA |
61 | fprintf(stderr, |
62 | "usage: %s [OPTS] IFINDEX\n\n" | |
63 | "OPTS:\n" | |
0489df9a DB |
64 | " -S use skb-mode\n" |
65 | " -N enforce native mode\n", | |
3993f2cb DA |
66 | prog); |
67 | } | |
86af8b41 | 68 | |
3993f2cb DA |
69 | int main(int argc, char **argv) |
70 | { | |
6dfca831 | 71 | struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; |
be5bca44 JK |
72 | struct bpf_prog_load_attr prog_load_attr = { |
73 | .prog_type = BPF_PROG_TYPE_XDP, | |
74 | }; | |
0489df9a | 75 | const char *optstr = "SN"; |
be5bca44 JK |
76 | int prog_fd, map_fd, opt; |
77 | struct bpf_object *obj; | |
78 | struct bpf_map *map; | |
3993f2cb | 79 | char filename[256]; |
3993f2cb DA |
80 | |
81 | while ((opt = getopt(argc, argv, optstr)) != -1) { | |
82 | switch (opt) { | |
83 | case 'S': | |
6387d011 | 84 | xdp_flags |= XDP_FLAGS_SKB_MODE; |
3993f2cb | 85 | break; |
0489df9a DB |
86 | case 'N': |
87 | xdp_flags |= XDP_FLAGS_DRV_MODE; | |
88 | break; | |
3993f2cb DA |
89 | default: |
90 | usage(basename(argv[0])); | |
91 | return 1; | |
92 | } | |
93 | } | |
86af8b41 | 94 | |
3993f2cb DA |
95 | if (optind == argc) { |
96 | usage(basename(argv[0])); | |
86af8b41 BB |
97 | return 1; |
98 | } | |
6dfca831 TD |
99 | |
100 | if (setrlimit(RLIMIT_MEMLOCK, &r)) { | |
101 | perror("setrlimit(RLIMIT_MEMLOCK)"); | |
102 | return 1; | |
103 | } | |
104 | ||
3993f2cb | 105 | ifindex = strtoul(argv[optind], NULL, 0); |
86af8b41 | 106 | |
3993f2cb | 107 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); |
be5bca44 | 108 | prog_load_attr.file = filename; |
86af8b41 | 109 | |
be5bca44 JK |
110 | if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd)) |
111 | return 1; | |
112 | ||
113 | map = bpf_map__next(NULL, obj); | |
114 | if (!map) { | |
115 | printf("finding a map in obj file failed\n"); | |
86af8b41 BB |
116 | return 1; |
117 | } | |
be5bca44 | 118 | map_fd = bpf_map__fd(map); |
86af8b41 | 119 | |
be5bca44 | 120 | if (!prog_fd) { |
86af8b41 BB |
121 | printf("load_bpf_file: %s\n", strerror(errno)); |
122 | return 1; | |
123 | } | |
124 | ||
125 | signal(SIGINT, int_exit); | |
ad990dbe | 126 | signal(SIGTERM, int_exit); |
86af8b41 | 127 | |
be5bca44 | 128 | if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) { |
86af8b41 BB |
129 | printf("link set xdp fd failed\n"); |
130 | return 1; | |
131 | } | |
132 | ||
be5bca44 | 133 | poll_stats(map_fd, 2); |
86af8b41 BB |
134 | |
135 | return 0; | |
136 | } |