Commit | Line | Data |
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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> |
dc378a1a | 18 | #include <net/if.h> |
e00c7b21 | 19 | |
e00c7b21 | 20 | #include "bpf_util.h" |
be5bca44 JK |
21 | #include "bpf/bpf.h" |
22 | #include "bpf/libbpf.h" | |
86af8b41 | 23 | |
86af8b41 | 24 | static int ifindex; |
6387d011 | 25 | static __u32 xdp_flags; |
86af8b41 BB |
26 | |
27 | static void int_exit(int sig) | |
28 | { | |
b259c2ff | 29 | bpf_set_link_xdp_fd(ifindex, -1, xdp_flags); |
86af8b41 BB |
30 | exit(0); |
31 | } | |
32 | ||
33 | /* simple per-protocol drop counter | |
34 | */ | |
be5bca44 | 35 | static void poll_stats(int map_fd, int interval) |
86af8b41 | 36 | { |
e00c7b21 | 37 | unsigned int nr_cpus = bpf_num_possible_cpus(); |
d606ee5c | 38 | __u64 values[nr_cpus], prev[UINT8_MAX] = { 0 }; |
86af8b41 BB |
39 | int i; |
40 | ||
86af8b41 | 41 | while (1) { |
d606ee5c MC |
42 | __u32 key = UINT32_MAX; |
43 | ||
86af8b41 BB |
44 | sleep(interval); |
45 | ||
d606ee5c | 46 | while (bpf_map_get_next_key(map_fd, &key, &key) != -1) { |
86af8b41 BB |
47 | __u64 sum = 0; |
48 | ||
be5bca44 | 49 | assert(bpf_map_lookup_elem(map_fd, &key, values) == 0); |
86af8b41 | 50 | for (i = 0; i < nr_cpus; i++) |
d606ee5c MC |
51 | sum += values[i]; |
52 | if (sum > prev[key]) | |
86af8b41 | 53 | printf("proto %u: %10llu pkt/s\n", |
d606ee5c MC |
54 | key, (sum - prev[key]) / interval); |
55 | prev[key] = sum; | |
86af8b41 BB |
56 | } |
57 | } | |
58 | } | |
59 | ||
3993f2cb | 60 | static void usage(const char *prog) |
86af8b41 | 61 | { |
3993f2cb | 62 | fprintf(stderr, |
dc378a1a | 63 | "usage: %s [OPTS] IFACE\n\n" |
3993f2cb | 64 | "OPTS:\n" |
0489df9a DB |
65 | " -S use skb-mode\n" |
66 | " -N enforce native mode\n", | |
3993f2cb DA |
67 | prog); |
68 | } | |
86af8b41 | 69 | |
3993f2cb DA |
70 | int main(int argc, char **argv) |
71 | { | |
6dfca831 | 72 | struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; |
be5bca44 JK |
73 | struct bpf_prog_load_attr prog_load_attr = { |
74 | .prog_type = BPF_PROG_TYPE_XDP, | |
75 | }; | |
0489df9a | 76 | const char *optstr = "SN"; |
be5bca44 JK |
77 | int prog_fd, map_fd, opt; |
78 | struct bpf_object *obj; | |
79 | struct bpf_map *map; | |
3993f2cb | 80 | char filename[256]; |
3993f2cb DA |
81 | |
82 | while ((opt = getopt(argc, argv, optstr)) != -1) { | |
83 | switch (opt) { | |
84 | case 'S': | |
6387d011 | 85 | xdp_flags |= XDP_FLAGS_SKB_MODE; |
3993f2cb | 86 | break; |
0489df9a DB |
87 | case 'N': |
88 | xdp_flags |= XDP_FLAGS_DRV_MODE; | |
89 | break; | |
3993f2cb DA |
90 | default: |
91 | usage(basename(argv[0])); | |
92 | return 1; | |
93 | } | |
94 | } | |
86af8b41 | 95 | |
3993f2cb DA |
96 | if (optind == argc) { |
97 | usage(basename(argv[0])); | |
86af8b41 BB |
98 | return 1; |
99 | } | |
6dfca831 TD |
100 | |
101 | if (setrlimit(RLIMIT_MEMLOCK, &r)) { | |
102 | perror("setrlimit(RLIMIT_MEMLOCK)"); | |
103 | return 1; | |
104 | } | |
105 | ||
dc378a1a MC |
106 | ifindex = if_nametoindex(argv[1]); |
107 | if (!ifindex) { | |
108 | perror("if_nametoindex"); | |
109 | return 1; | |
110 | } | |
86af8b41 | 111 | |
3993f2cb | 112 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); |
be5bca44 | 113 | prog_load_attr.file = filename; |
86af8b41 | 114 | |
be5bca44 JK |
115 | if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd)) |
116 | return 1; | |
117 | ||
118 | map = bpf_map__next(NULL, obj); | |
119 | if (!map) { | |
120 | printf("finding a map in obj file failed\n"); | |
86af8b41 BB |
121 | return 1; |
122 | } | |
be5bca44 | 123 | map_fd = bpf_map__fd(map); |
86af8b41 | 124 | |
be5bca44 | 125 | if (!prog_fd) { |
86af8b41 BB |
126 | printf("load_bpf_file: %s\n", strerror(errno)); |
127 | return 1; | |
128 | } | |
129 | ||
130 | signal(SIGINT, int_exit); | |
ad990dbe | 131 | signal(SIGTERM, int_exit); |
86af8b41 | 132 | |
be5bca44 | 133 | if (bpf_set_link_xdp_fd(ifindex, prog_fd, xdp_flags) < 0) { |
86af8b41 BB |
134 | printf("link set xdp fd failed\n"); |
135 | return 1; | |
136 | } | |
137 | ||
be5bca44 | 138 | poll_stats(map_fd, 2); |
86af8b41 BB |
139 | |
140 | return 0; | |
141 | } |